The compound BaCl₂ will conduct electricity. Therefore, the correct options are C.
Substances that conduct electricity dissolve in solution to give ions. These ions are the charge carriers in solution. Only ionic substances can dissolve in water to give ions that conduct electricity. MgSO₄ and BaCl₂ are ionic substances. They yield ions in solutions which conduct electrical current.
Ionic compounds have high points of melting and boiling and appear to be strong and brittle. Ions may be single atoms, such as sodium and chlorine in common table salt (sodium chloride) or more complex groups such as calcium carbonate.
To learn more about ionic compound check the link below-
https://brainly.com/question/2687188
#SPJ4
a dry cell typically contains which of the following? select the correct answer below: a zn2 concentration cell a zn2 /c2 concentration cell solid zn and solid c (as graphite) solid zn and solid c (as diamond)
A dry cell typically contains solid zinc and solid carbon (as graphite) as the anode and cathode, respectively. The electrolyte is usually a paste or gel containing ammonium chloride and/or zinc chloride.
The chemical reaction between the zinc and electrolyte generates a flow of electrons that can be used to power a device. This type of cell is commonly used in small electronic devices such as flashlights, portable radios, and toys. It is important to note that a dry cell is different from a wet cell, which contains a liquid electrolyte. Dry cells are preferred in many applications because they are more portable, have a longer shelf life, and are less likely to leak.
A dry cell typically contains which of the following? The correct answer is: solid Zn and solid C (as graphite).
A dry cell, commonly used in batteries, has a zinc anode and a graphite cathode, which is a form of carbon. The zinc provides a source of Zn2+ ions, and the graphite cathode conducts electricity. The electrolyte in a dry cell usually consists of a paste containing a mixture of chemicals, such as ammonium chloride or zinc chloride. This paste allows ions to flow between the electrodes, enabling the electrochemical reactions necessary for the cell to generate electrical energy.
To know more about zinc visit:
https://brainly.com/question/13890062
#SPJ11
TRUE/FALSE. the ph at the equivalence point in the hno3 titration will be lower than the ph at the equivalence point in the ch3cooh titration
The ph at the equivalence point in the hno₃ titration will be lower than the ph at the equivalence point in the ch₃cooh titration. this statement is true.
The pH at the equivalence point of an acid-base titration depends on the strength of the acid and base being titrated. Nitric acid (HNO₃) is a strong acid and acetic acid (CH₃COOH) is a weak acid. At the equivalence point of a strong acid-strong base titration, the pH is typically neutral (pH 7), while at the equivalence point of a weak acid-strong base titration, the pH is typically basic (pH > 7). Since HNO₃ is a strong acid, the pH at its equivalence point will be lower than that of CH₃COOH.
The pH value is a measurement of the acidity or alkalinity (basicity) of a solution, typically ranging from 0 to 14. The term "pH" stands for "power of hydrogen" and refers to the concentration of hydrogen ions (H+) in the solution.
On the pH scale, 7 is neutral, meaning there is an equal concentration of hydrogen ions and hydroxide ions (OH-) in the solution. Below 7 is acidic, with a higher concentration of hydrogen ions, while above 7 is basic, with a higher concentration of hydroxide ions.
Therefore, the correct option is true.
To learn about equivalence points:
https://brainly.com/question/13954324
#SPJ4
Calculate the [H3O+] in 0.030 M potassium fluoride, KF.
a. 2.5 × 10−8 M
b. 1.5 × 10−8 M
c. 8.3 × 10−9 M
d. 6.8 × 10−4 M
e. 5.5 × 10−9 M
To calculate the [H3O+] in a 0.030 M potassium fluoride (KF) solution, we must first determine the dissociation constant of the fluoride ion (F-), which acts as a base in the solution. We'll use the Kb value of F- and the ion-product constant of water (Kw) to find the [H3O+].
The Kb value for F- can be calculated from the Ka value of its conjugate acid, HF. The Ka for HF is 7.2 × 10−4. The ion-product constant of water (Kw) is 1.0 × 10−14.
Kb = Kw / Ka = (1.0 × 10−14) / (7.2 × 10−4) = 1.39 × 10−11
Now, we'll use the Kb value and the concentration of KF to find the [OH-] using the following equation:
Kb = [OH-][F-] / [F-]
Since the concentration of KF is 0.030 M, and it dissociates completely into K+ and F-, the initial concentration of F- is also 0.030 M. Since we are interested in [OH-], we can simplify the equation as follows: 1.39 × 10−11 = [OH-] * 0.030
Now, calculate the [OH-]:
[OH-] = (1.39 × 10−11) / 0.030 ≈ 4.63 × 10−10 M
Finally, to find the [H3O+], we use the relationship:
[H3O+] * [OH-] = Kw
[H3O+] = Kw / [OH-] = (1.0 × 10−14) / (4.63 × 10−10) ≈ 2.16 × 10−9 M
None of the given options exactly match the calculated value, but option (e) 5.5 × 10−9 M is the closest to the calculated [H3O+]. So, the answer is e. 5.5 × 10−9 M
To know more about potassium fluoride
https://brainly.com/question/31290605
#SPJ11
the half-life of cobalt-60 is 5.3 years, while that of strontium-90 is 28 years. suppose that samples of cobalt-60 and strontium-90 are such that they initially have the same activity (number of decays per second). what is true about the initial numbers of cobalt-60 and strontium-90 nuclei in these samples?
The true about the initial numbers of the cobalt-60 and the strontium-90 nuclei in the samples is There will more strontium-90 than the cobalt-60 nuclei. The correct option is A.
In the 28 years of the strontium 90 it posses the 50 % of original atoms. The cobalt 60 will have over the five of the half lives. The percent of the cobalt 60 atoms remains is 128 atoms.
128 / 2 = 64 , That means after first half life only 50 % of the cobalt 60 atoms remains.64 / 2 = 32, That means after 2nd half life only 25 % of the cobalt - 60 atoms remains.32 / 2 = 16 , That means after 3rd half life only 12.5 % of the cobalt 60 atoms remains.16 / 2 = 8 , That means after 4th half-life only 6.25 % of the cobalt 60 atoms remains.8 / 2 = 4, That means after 5th half life only 3.12 % of the cobalt 60 atoms remains.Thus, There will more the strontium-90 than the cobalt-60 nuclei. The correct option is A.
To learn more about half-life here
https://brainly.com/question/30518617
#SPJ4
This question is incomplete, the complete question is :
The half-life of cobalt-60 is 5.3 years, while that of strontium-90 is 28 years. suppose that samples of cobalt-60 and strontium-90 are such that they initially have the same activity (number of decays per second). what is true about the initial numbers of cobalt-60 and strontium-90 nuclei in these samples?
A. There will be more strontium-90 than cobalt-60 nuclei.
B. There will be equal numbers of cobalt-60 and strontium-90 nuclei.
C. There will be more cobalt-60 than strontium-90 nuclei.
D. It is not possible to compare the number of nuclei without knowing the masses of the samples.
Calculate the pH of a buffer that is 0.145 M HC 2H 3O 2 and 0.202 M KC 2H 3O 2. The K a for HC 2H 3O 2 is 1.8 × 10^ -5.
4.89
9.01
4.60
5.05
4.74
pH of the given buffer solution is 4.89, where [HC2H3O2] = 0.145 M, [KC2H3O2] = 0.202 M, and pKa = 1.8 × 10^-5.
What is the pH of a buffer solution with [HC2H3O2] = 0.145 M, [KC2H3O2] = 0.202 M, and pKa = 1.8 × 10^-5?
To calculate the pH of a buffer solution, we can use the Henderson-Hasselbalch equation:
pH = pKa + log([A^-]/[HA]),
where pKa is the negative logarithm (base 10) of the acid dissociation constant (K a), [A^-] is the concentration of the conjugate base (acetate ion, C2H3O2^-), and [HA] is the concentration of the weak acid (acetic acid, HC2H3O2).
First, let's calculate the pKa of acetic acid using the given K a value:
K a = [H+][C2H3O2^-]/[HC2H3O2]
1.8 × 10^ -5 = x^2/0.145
x = 0.00377 M, which is the concentration of H+
pKa = -log(K a) = -log(1.8 × 10^ -5) = 4.74
Now, let's plug in the values for the concentrations of HC2H3O2 and KC2H3O2 to find [A^-]/[HA]:
[A^-]/[HA] = [KC2H3O2]/[HC2H3O2]
= 0.202 M / 0.145 M
= 1.39
Finally, we can use the Henderson-Hasselbalch equation to find the pH:
pH = pKa + log([A^-]/[HA])
= 4.74 + log(1.39)
= 4.89
Therefore, the pH of the buffer solution is 4.89. The answer is closest to option A (4.89).
To learn more about buffer solution, visit: https://brainly.com/question/8676275
#SPJ4
what is the total pressure (atm) in a 10.0 l vessel that contains 2.34 mol of carbon dioxide, 1.73 mol of sulfur dioxide, and 4.50 mol of argon at standard temperature?
The total pressure in the 10.0 L vessel that contains 2.34 mol of carbon dioxide, 1.73 mol of sulfur dioxide, and 4.50 mol of argon at standard temperature is 18.5 atm.
To find the total pressure in the vessel, we can use the ideal gas law equation: PV = nRT. At standard temperature and pressure (STP), which is 0°C (273 K) and 1 atm, we can assume that the gas constant (R) is equal to 0.0821 L·atm/(mol·K).
First, we need to calculate the total moles of gas in the vessel:
Total moles = 2.34 mol CO2 + 1.73 mol SO2 + 4.50 mol Ar = 8.57 mol
Next, we can use the ideal gas law equation to find the total pressure:
P(total) * V = n * R * T
P(total) = (n * R * T) / V
P(total) = (8.57 mol * 0.0821 L·atm/(mol·K) * 273 K) / 10.0 L
P(total) = 18.5 atm
Therefore, the total pressure in the 10.0 L vessel that contains 2.34 mol of carbon dioxide, 1.73 mol of sulfur dioxide, and 4.50 mol of argon at standard temperature is 18.5 atm.
To know more about standard temperature visit:-
https://brainly.com/question/29129606
#SPJ11
Assuming the volume of a gas in a closed system is constant. If the pressure is increased, how can the system adjust to the change?
Answer:
Decrease the temperature in the system
which of the following is an example of a heterogeneous mixture?
a.) apple juice
b.) tap water
c.) air
d.) italian salad dressing.
Italian salad dressing is an example of a heterogeneous mixture. In a heterogeneous mixture, the components are not uniformly distributed, and the composition varies throughout the mixture. The different substances are visible and can be separated physically, often by methods such as filtration or decantation.
Italian salad dressing typically consists of oil, vinegar, and various herbs and spices. These ingredients do not dissolve into one another and form a uniform solution; rather, they remain distinct, creating a mixture with a non-uniform composition. When left undisturbed, the oil and vinegar will separate into different layers, further demonstrating the heterogeneous nature of the dressing.
In contrast, a homogeneous mixture would have a consistent and uniform composition throughout, with all components thoroughly mixed together, like a solution. Since Italian salad dressing exhibits a non-uniform distribution of its ingredients and can be separated into its individual components, it is considered a heterogeneous mixture.
to know more about italian salad click this link
/brainly.com/question/17618040
#SPJ11
what are the three possible limiting reagents for this two step synthesis
To identify the limiting reagent in a chemical reaction, you first need to write the balanced chemical equation for the reaction. The balanced equation shows the mole ratios of the reactants and products involved in the reaction.
Once you have the balanced equation, you can determine the limiting reagent by comparing the number of moles of each reactant available to the mole ratios in the balanced equation.
The reactant that produces the smallest amount of product is the limiting reagent because it limits the amount of product that can be formed.
In a two-step synthesis, there are two reactions involved, and each reaction has its own balanced equation. The limiting reagent for the first reaction becomes the reactant for the second reaction, and the limiting reagent for the second reaction determines the maximum amount of product that can be formed.
For example, consider the two-step synthesis of ammonia (NH3) from nitrogen gas (N2) and hydrogen gas (H2):
Step 1: N2 (g) + 3H2 (g) → 2NH3 (g)
Step 2: NH3 (g) + H2O (l) → NH4+ (aq) + OH- (aq)
The balanced equations for these reactions show that one mole of nitrogen gas reacts with three moles of hydrogen gas to produce two moles of ammonia in the first step, and one mole of ammonia reacts with one mole of water to produce one mole of ammonium ions and one mole of hydroxide ions in the second step.
To determine the limiting reagent in this two-step synthesis, you need to consider the amount of each reactant available for each step.
For example, if you have one mole of nitrogen gas and two moles of hydrogen gas available, the limiting reagent in the first step would be nitrogen gas because it produces only two moles of ammonia, whereas the excess hydrogen gas would produce six moles of ammonia.
In the second step, the limiting reagent would depend on the amount of ammonia produced in the first step.
If two moles of ammonia were produced, then two moles of ammonia would react with two moles of water, and the limiting reagent would be water because it produces only two moles of ammonium ions and two moles of hydroxide ions, whereas the excess ammonia would not react.
In summary, the identification of the limiting reagent in a two-step synthesis depends on the amount of each reactant available for each step, and it determines the maximum amount of product that can be formed.
To learn more about moles, refer below:
https://brainly.com/question/31597231
#SPJ11
Calculate the [SO42−] in 0.20 M H2SO4.
a. 4.3 × 10−2 M
b. 8.4 × 10−2 M
c. 1.1 × 10−2 M
d. 6.4 × 10−1 M
e. 2.5 × 10−1 M
The [SO42−] in 0.20 MH₂SO₄can be calculated using the balanced chemical equation for the dissociation of H₂SO₄
the answer is e. 2.5 × 10−1 M.
The [SO42−] in 0.20 M H₂SO₄can be calculated using the balanced chemical equation for the dissociation of H₂SO₄:
H₂SO₄ ⇌ 2H+ + SO42−
From this equation, we know that 1 mole of H₂SO₄ dissociates into 1 mole of SO42−. Therefore, the concentration of SO42− is equal to the concentration of H₂SO₄
[SO42−] = 0.20 M
Therefore, the answer is e. 2.5 × 10−1 M.
This is defined as a written expression of a chemical reaction and contains the reactants and products which are involved.
It also has to be balanced which means that the number of atoms of elements on the reactants side has to be equal to that on the product side.
This is therefore the reason why only coefficients are adjusted to ensure the equation is balanced. Other parts such as the superscripts and subscripts shouldn't be adjusted in this scenario.
Read more about Chemical equation here brainly.com/question/11231920
#SPJ11
If a vinegar solution has a pH = 4.00, the OH-1 concentration (molarity) is (A) 1 x 10-10. (B) 0. (C) 1 x 10-7. (D) 7 x 10-4. (E) 1 x 10-4.
The pH and pOH of a solution are related by the equation:
pH + pOH = 14
We can rearrange this equation to solve for the pOH:
pOH = 14 - pH
In this case, the pH of the vinegar solution is 4.00, so:
pOH = 14 - 4.00 = 10.00
We can then use the definition of pOH to calculate the hydroxide ion concentration:
pOH = -log[OH-1]
10.00 = -log[OH-1]
10^-10.00 = [OH-1]
[OH-1] = 1 x 10^-10
Therefore, the answer is (A) 1 x 10^-10.
To know more about pH, click here-
https://brainly.com/question/15289741
#SPJ11
how do we choose a solvent for recrystallization, describe requirements and lab techniques involved
Recrystallization is a process used to purify solid compounds by dissolving them in a suitable solvent, allowing the impurities to remain undissolved and filtering the pure crystals. When choosing a solvent for recrystallization, several factors must be considered.
The solvent should have a high solubility for the compound to be purified at high temperatures, and a low solubility at room temperature. It should also be volatile and easily removed from the crystals during the drying process. Additionally, the solvent should not react with the compound being purified or with the filter paper used in the filtration process.
Lab techniques involved in recrystallization include heating the solvent to dissolve the compound, cooling the solution to allow crystals to form, and filtering the crystals to separate them from the solvent and any remaining impurities.
The solvent can be selected based on the properties of the compound to be purified, and a small-scale test can be performed to determine the effectiveness of the solvent. Recrystallization is an important technique in organic chemistry for obtaining high-purity compounds.
you know more about Recrystallization pls visit-
https://brainly.com/question/29215760
#SPJ11
select the number of moles of co2 formed by the reaction of 0.153 mol c3h8 with excess (non-limiting) o2.
The number of moles of [tex]CO_2[/tex] formed by the reaction of 0.153 mol [tex]C_3H_8[/tex] with excess (non-limiting) [tex]O_2[/tex] is 0.4593 moles.
What is reaction?Reaction is the process of responding to an event, stimulus, or action. It can be physical, mental, or emotional. Physical reactions can include changes in body temperature, heart rate, respiration, or blood pressure. Mental reactions involve processes such as thought, memory, or perception. Emotional reactions involve expressions of feeling, such as joy, anger, fear, or love. In addition to these physical, mental, and emotional responses, reactions can also be behavioral, or involve taking action.
The number of moles of [tex]CO_2[/tex] formed by the reaction of 0.153 mol [tex]C_3H_8[/tex] with excess (non-limiting) [tex]O_2[/tex] is 0.4593 moles.
This is because the reaction of [tex]C_3H_8[/tex] and [tex]O_2[/tex] forms 3 moles of [tex]CO_2[/tex] for every 1 mole of [tex]C_3H_8[/tex] that is reacted. Therefore, 0.153 moles of [tex]C_3H_8[/tex] will produce 0.4593 moles of [tex]CO_2[/tex] (0.153 x 3 = 0.4593).
To learn more about reaction
https://brainly.com/question/25769000
#SPJ4
determine the number of moles of gas in a 2.01 l container at 287.4 k and a pressure of 1.36 atm. round your answer to two decimal places.
There are 2.63 moles of gas in a 2.01 l container at 287.4 K and a pressure of 1.36 atm. Rounding the answer to two decimal places gives us 2.63 moles.
What is pressure ?Pressure is a force per unit area applied to an object. It is measured in units such as pascals (Pa), atmospheres (atm), millimeters of mercury (mmHg), and pounds per square inch (psi). Pressure is typically caused by the weight of the atmosphere pressing down on an object, or by a fluid pushing against the object. Pressure can also be created by the movement of the object, such as when a liquid is stirred or when a gas is compressed. When pressure is applied, it can cause objects to deform, move, or change shape.
The number of moles of gas in a 2.01 l container can be determined by using the ideal gas law equation, PV = nRT, R is the ideal gas constant, and T is the temperature in Kelvin. Plugging in the given values, we get:1.36 atm * 2.01 L = n * 0.0821 * 287.4 K
Solving for n, we get,n = (1.36 atm * 2.01 L) / (0.0821 * 287.4 K)
n = 2.63 moles.
To learn more about pressure
https://brainly.com/question/24719118
#SPJ4
a sample of an ideal gas with an initial volume of 17.0 l at a pressure of 580 mm hg is compressed until the volume is 2.8 l with no change of temperature. what is the final pressure (mm hg) of the gas?
The final pressure of the gas is 3480 mm Hg. The gas was compressed from 17.0 L to 2.8 L at a constant temperature.
To find the final pressure of the gas, we can use Boyle's Law, which states that for an ideal gas at a constant temperature, the product of its initial pressure and volume is equal to the product of its final pressure and volume (P1V1 = P2V2). In this case, the initial volume (V1) is 17.0 L, the initial pressure (P1) is 580 mm Hg, and the final volume (V2) is 2.8 L. By substituting the given values into the equation and solving for the final pressure (P2), we can determine that the final pressure of the gas is 3480 mm Hg.
Calculation steps:
1. Write the Boyle's Law equation: P1V1 = P2V2
2. Substitute the given values: (580 mm Hg)(17.0 L) = P2(2.8 L)
3. Solve for P2: P2 = (580 mm Hg)(17.0 L) / (2.8 L)
4. Calculate P2: P2 = 3480 mm Hg
To know more about Boyle's Law visit:
https://brainly.com/question/1696010
#SPJ11
What is the concentration of h2so4 if 12. 3 ml of 0. 200 m naoh solution is needed to neutralize 10. 0 ml of h2so4 solution ?.
The concentration of H₂SO₄ in the original solution is 0.123 M.
Balanced chemical equation for the neutralization reaction between sulfuric acid (H₂SO₄) and sodium hydroxide (NaOH) is;
H₂SO₄ + 2NaOH → Na₂SO₄ + 2H₂O
From the equation, we can see that one mole of sulfuric acid reacts with two moles of sodium hydroxide. Therefore, we can use the following equation to calculate the moles of sulfuric acid present in the 10.0 mL of H₂SO₄ solution;
moles of H₂SO₄ = moles of NaOH / 2
To calculate the moles of NaOH, we can use the following equation;
moles of NaOH = Molarity x Volume (in liters)
The volume of NaOH used is 12.3 mL, which is 0.0123 L.
Substituting the given values into the equation;
moles of NaOH = 0.200 mol/L x 0.0123 L = 0.00246 moles
Now we can calculate the moles of H₂SO₄;
moles of H₂SO₄ = 0.00246 moles / 2 = 0.00123 moles
Finally, we can calculate the concentration of the H₂SO₄ solution in units of moles per liter (M);
Molarity of H₂SO₄ = moles of H₂SO₄ / volume of H₂SO₄ (in liters)
The volume of H₂SO₄ used is 10.0 mL, which is 0.0100 L.
Substituting the values we know;
Molarity of H₂SO₄ = 0.00123 moles / 0.0100 L
= 0.123 M
Therefore, the concentration of H₂SO₄ is 0.123 M.
To know more about neutralization reaction here
https://brainly.com/question/28970253
#SPJ4
Which of the following terms accurately describes the regiochemical outcome of a hydrohalogenation reaction?A. anti addition B. Markovnikov addition C. anti-Markovnikov addition.D syn addition
Anti-Markovnikov addition accurately describes the regiochemical outcome of a hydrohalogenation reaction.
What is regiochemical outcome?Regiochemical outcome is the outcome of a chemical reaction with regards to the orientation of the reaction's reactants and products. It is determined by the reaction's stereochemistry, which is the arrangement of atoms in a molecule that determines its shape, reactivity, and other properties. Regiochemical outcomes are important in determining the physical and chemical properties of a compound, and can be used to predict how a compound will interact with other compounds in a reaction. It is also used to inform the synthesis of a compound, allowing chemists to control the stereochemistry of the product by manipulating the stereochemistry of the reactants.
To learn more about regiochemical outcome
https://brainly.com/question/21772440
#SPJ4
Calculate the change in Gibbs free energy for each of the sets of ΔH rxn, ΔSrxn, and T given in Problem 42. Predict whether or not each reaction is spontaneous at the temperature indicated. (Assume that all reactants and products are in their standard states.)
To calculate the change in Gibbs free energy (ΔG) for each reaction, we can use the equation:
ΔG = ΔH - TΔS
where ΔH is the change in enthalpy, ΔS is the change in entropy, and T is the temperature in Kelvin.
Let's first look at Problem 42 to see what values of ΔH, ΔS, and T are given for each reaction. We're assuming that all reactants and products are in their standard states, which means that they're at a pressure of 1 bar and a concentration of 1 M.
Problem 42:
a) ΔH rxn = -150 kJ/mol, ΔSrxn = -0.25 kJ/(mol*K), T = 298 K
b) ΔH rxn = 100 kJ/mol, ΔSrxn = 0.5 kJ/(mol*K), T = 373 K
c) ΔH rxn = -50 kJ/mol, ΔSrxn = 0.1 kJ/(mol*K), T = 273 K
Using the equation above, we can calculate the ΔG for each reaction:
a) ΔG = (-150 kJ/mol) - (298 K)(-0.25 kJ/(mol*K)) = -82.5 kJ/mol
b) ΔG = (100 kJ/mol) - (373 K)(0.5 kJ/(mol*K)) = -82.5 kJ/mol
c) ΔG = (-50 kJ/mol) - (273 K)(0.1 kJ/(mol*K)) = -77.3 kJ/mol
Now, we can predict whether each reaction is spontaneous at the given temperature. A reaction is spontaneous if ΔG is negative (or if it's zero, in the case of a reversible reaction).
a) ΔG is negative, so the reaction is spontaneous.
b) ΔG is negative, so the reaction is spontaneous.
c) ΔG is negative, so the reaction is spontaneous.
Therefore, all three reactions are spontaneous at the given temperature, assuming that all reactants and products are in their standard states.
learn more about Gibbs free energy
https://brainly.com/question/9179942
#SPJ11
what is the structure of the white precipitate that forms when acetophenone is added to a solution of phenylmagnesium bromide?
The white precipitate that forms when acetophenone is added to a solution of phenylmagnesium bromide is the product of a Grignard reaction.
The structure of the precipitate is a complex between the phenylmagnesium bromide and the acetophenone, forming a new carbon-carbon bond between the phenyl group and the carbonyl group of the acetophenone. The precipitate is typically a white, crystalline solid, with a molecular formula of C14H13MgBrO.
The structure of the white precipitate that forms when acetophenone is added to a solution of phenylmagnesium bromide is triphenylmethanol. Here's a step-by-step explanation of the reaction:
1. Acetophenone (C6H5COCH3) is added to the solution of phenylmagnesium bromide (C6H5MgBr).
2. The Grignard reagent, phenylmagnesium bromide, reacts with the carbonyl group (C=O) in acetophenone, forming a magnesium alkoxide intermediate.
3. After the reaction, the mixture is treated with an acid, typically dilute hydrochloric acid (HCl), which protonates the alkoxide intermediate.
4. This protonation results in the formation of triphenylmethanol (C19H16O), a white precipitate.
In summary, the structure of the white precipitate formed in this reaction is triphenylmethanol, which is produced through a Grignard reaction between acetophenone and phenylmagnesium bromide, followed by an acid workup.
To know more about precipitate visit:
https://brainly.com/question/18109776
#SPJ11
radioactive chromium-51 decays with a half-life of 28.0 days. a chemist obtains a fresh sample of chromium-51 and measures its radioactivity. she then determines that to do an experiment, the radioactivity cannot fall below 25% of the initial measured value. how many days does she have to perform the experiment?
The chemist has approximately 56.0 days to perform the experiment.
Radioactive chromium-51 has a half-life of 28.0 days. This means that after 28.0 days, the radioactivity will reduce to 50% of the initial value. To find out how many days it takes for the radioactivity to fall below 25%, we can use the half-life formula:
Remaining radioactivity (%) = Initial radioactivity * (1/2)^(time / half-life)
We need to find the time (in days) when the remaining radioactivity is 25%. So, we can set up the equation:
25% = 100% * (1/2)^(time / 28.0 days)
To solve for time, we first need to divide both sides of the equation by 100%:
0.25 = (1/2)^(time / 28.0 days)
Now, take the logarithm of both sides of the equation and use the logarithm properties to solve for time:
log(0.25) = (time / 28.0 days) * log(1/2)
time / 28.0 days = log(0.25) / log(1/2)
time = 28.0 days * (log(0.25) / log(1/2))
time ≈ 56.0 days
The chemist has approximately 56.0 days to perform the experiment before the radioactivity falls below 25% of the initial measured value.
To know more about experiment, visit;
https://brainly.com/question/25303029
#SPJ11
A 2.00-liter sample of nitrogen gas at 27 c is heated until it occupies a volume of 5.00-liters. if the p remains unchanged, what is the final temperature of the gas in Celsius? (447 c)
Hint: You must convert into Kelvin to use the combined gas law, then convert your answer back in Celsius
A 2.00-liter of nitrogen gas at 27 °C is heated until it will occupies the volume of the 5.00-liters. The final temperature of the gas in Celsius is 447 °C.
The volume and the temperature relation at the constant pressure is expressed as :
V₁ / T₁ = V₂ / T₂
T₂ = V₂ T₁ / V₁
The initial volume of the gas, V₁ = 2 L
The final volume of the gas, V₂ = 5 L
The initial temperature of the gas, T₁ = 27 + 273
The initial temperature of the gas, T₁ = 300 K
The final temperature of the gas, T₂ = ?
T₂ = V₂ T₁ / V₁
T₂ = ( 5 × 300 ) / 2
T₂ = 750 K
In degree Celsius :
T₂ = 750 - 273
T₂ = 447 °C
The final temperature of the gas is 447 °C.
To learn more about temperature here
https://brainly.com/question/31295049
#SPJ1
How might researchers identify which ion enters the cell from outside, causing the rapid rise in membrane potential that initiates the action potential in additional experiments?.
By comparing the ion currents in the presence and absence of specific ion channel blockers, researchers can determine the ion responsible for the rapid rise in membrane potential.
Researchers can identify the ion responsible for the rapid rise in membrane potential during action potential initiation by conducting experiments using voltage-clamp techniques and ion-specific blockers. They can measure the flow of ions across the cell membrane while holding the membrane potential at a fixed value.
Additionally, they can use ion-sensitive electrodes or fluorescent dyes to measure changes in ion concentrations inside and outside the cell. These techniques can help pinpoint the ion responsible for initiating the action potential.
Find out more about membrane potential visit:
https://brainly.com/question/31591316
#SPJ11
assume that you started with 0.3 moles of oil molecules. a) how many moles of methyl ester biodiesel could you theoretically make? [ select ] b) how many moles of the glycerol byproduct could you theoretically make? [ select ]
If you started with 0.3 moles of oil molecules, you could theoretically make 0.3 moles of methyl ester biodiesel and 0.3 moles of glycerol byproduct.
The process of making biodiesel involves a reaction called transesterification, in which the oil molecules are converted into methyl ester biodiesel and glycerol. The ratio of the reactants used in the transesterification reaction is 3:1, meaning that for every three molecules of oil, one molecule of glycerol is produced. This also means that for every three molecules of oil, three molecules of methyl ester biodiesel are produced.
Therefore, if you started with 0.3 moles of oil molecules, you could theoretically make 0.3/3 = 0.1 moles of glycerol and 0.3 moles of methyl ester biodiesel. This is because every 3 moles of oil will produce 1 mole of glycerol and 3 moles of biodiesel. So, with 0.3 moles of oil, you would end up with 0.1 moles of glycerol and 0.3 moles of biodiesel.
In conclusion, if you started with 0.3 moles of oil molecules, you could theoretically make 0.3 moles of methyl ester biodiesel and 0.1 moles of glycerol byproduct through the transesterification reaction.
To know more about transesterification refer to
https://brainly.com/question/31797652
#SPJ11
100. ml of 0.200 m hcl is titrated with 0.250 m naoh .. what is the ph after 50.0 ml has been added?
To solve this problem, we need to use the equation for the reaction between HCl and NaOH:
HCl + NaOH → NaCl + H₂O
We know that 100 ml of 0.200 M HCl is titrated with 0.250 M NaOH, which means that the number of moles of NaOH added is:
(0.250 mol/L) x (0.0500 L) = 0.0125 mol NaOH
According to the balanced equation, 1 mole of NaOH reacts with 1 mole of HCl, so the number of moles of HCl remaining is:
0.0125 mol HCl
The total volume of the solution is now 150 ml (100 ml + 50 ml), so the concentration of HCl is:
0.0125 mol / 0.150 L = 0.0833 M HCl
To find the pH of the solution, we can use the equation:
pH = -log[H⁺]
We know that HCl is a strong acid, which means that it completely dissociates in water to form H⁺ ions and Cl⁻ ions. Therefore, the concentration of H⁺ ions in the solution is equal to the concentration of HCl:
[H⁺] = 0.0833 M
Plugging this value into the equation for pH gives:
pH = -log(0.0833) = 1.08
Therefore, the pH of the solution after 50.0 ml of 0.250 M NaOH has been added is approximately 1.08.
To know more about moles, visit:
https://brainly.com/question/31597231
#SPJ11
What color will a solution be if it contains only k2cro4.
concentrated nitric acid is an aqueous solution that is 63 % hno3 by mass. if the density of this solution is 1.325 g/ml , what is its molality?
To find the molality of the solution, we need to first calculate the moles of HNO3 in 1000 g (1 liter) of solution, and then divide by the mass of the solvent (water) in kilograms So the molality of the solution is 27.03 mol/kg.
Molality is a unit of concentration that represents the number of moles of solute per kilogram of solvent. It is denoted by the symbol "m".Molality is a unit of concentration used in chemistry. It is defined as the number of moles of solute dissolved in 1 kilogram of solvent. The molality of a solution is represented by the symbol "m" and is calculated using the following formula.
To know more about Molality visit :
https://brainly.com/question/26921570
#SPJ11
Which of the methods are the general methods of polymer production?.
The general methods of polymer production are addition polymerization, condensation polymerization, and ring-opening polymerization. Addition polymerization involves the addition of unsaturated monomers to form a polymer, while condensation polymerization involves the reaction of monomers with the elimination of a small molecule such as water or alcohol. Ring-opening polymerization involves the opening of cyclic monomers to form a linear polymer.
There are several general methods of polymer production, including:
1. Addition polymerization: In this method, monomers with unsaturated bonds react with one another to form a polymer chain. This process involves the breaking of the double bond and joining of the monomers to form a long chain polymer.
2. Condensation polymerization: This method involves the reaction between two or more different monomers, where the resulting polymer molecule is accompanied by the production of small molecules such as water, alcohol, or ammonia.
3. Emulsion polymerization: This is a process where the monomers are emulsified in water to form tiny droplets. A polymerization initiator is then added to the system, which causes the monomers to polymerize and form a latex of polymer particles.
4. Polycondensation: This is a method in which small molecules are linked together through a series of condensation reactions to form a polymer.
These methods are used to produce a wide range of polymers with varying properties and applications.
To know more about the polymer production refer here :
https://brainly.com/question/11858381#
#SPJ11
what is the relationship between these numbers: number of atomic orbitals that hybridize, and the number of electron groups around the central atom? group of answer choices the number of atomic orbitals needed is the same as the number of electron groups around a central atom.
The number of atomic orbitals needed is the same as the number of electron groups around a central atom.
When a central atom forms covalent bonds with other atoms, the electron groups around the central atom determine the number of hybrid orbitals needed to form those bonds. Each electron group, whether it is a lone pair or a bond, requires an atomic orbital to hybridize. Therefore, the number of atomic orbitals needed is directly related to the number of electron groups around the central atom.
In summary, the relationship between the number of atomic orbitals that hybridize and the number of electron groups around the central atom is that they are equal. This relationship is important in understanding the geometry and bonding of molecules.
To know more about atomic orbitals, visit;
https://brainly.com/question/20319149
#SPJ11
true or false? inhalants tend to be fat-soluble and therefore readily retained in lipid-rich vital organs. question 35 options: true false
Assume you are performing the calibration step of experiment 8 and you begin with 40 g of water at 20 oc and 40 g of water at 80 oc. After adding the two portions of water into your calorimeter setup and following the procedure outlined in the experiment, you determine the temperature of the mixed portions of water to be 45 oc. What is the heat capacity of the calorimeter?.
The heat capacity of the calorimeter is approximately 752 J/°C.
To determine the heat capacity of the calorimeter, we can use the following equation;
q = -C_cal × ΔT
where q is heat absorbed by the calorimeter, C_cal is heat capacity of the calorimeter, and ΔT is temperature change of the mixed portions of water.
In this case, the initial temperature of one portion of water is 20°C, while the initial temperature of the other portion is 80°C. The total mass of water is 40 g + 40 g = 80 g.
The heat absorbed by calorimeter can be calculated by using the equation;
q = m × c × ΔT
where m is mass of water, c is specific heat capacity of water, and ΔT is the temperature change of the water.
For the first portion of water at 20°C;
q₁ = m₁ × c × ΔT₁
= 40 g × 4.18 J/g°C × (45°C - 20°C)
= 2512 J
For the second portion of water at 80°C;
q₂ = m₂ × c × ΔT₂
= 40 g × 4.18 J/g°C × (45°C - 80°C)
= -6272 J
The negative sign in the value of q₂ indicates that heat is lost by the second portion of water as it cools down to 45°C.
The total heat absorbed by calorimeter is;
q = q₁ + q₂
= 2512 J - 6272 J
= -3760 J
The temperature change of the mixed portions of water is;
ΔT = 45°C - ((20°C + 80°C)/2)
= -5°C
We can now use the first equation to solve for the heat capacity of the calorimeter:
C_cal = -q / ΔT
= -(-3760 J) / (-5°C)
= 752 J/°C
Therefore, the heat capacity is 752 J/°C
To know more about heat capacity here
https://brainly.com/question/1747943
#SPJ4
