The molarity of a solution is 0.909 M.
m(CaCl₂) = 82 g; mass of calcium chloride
M(CaCl₂) = 111 g/mol; molar mass of calcium chloride
n(CaCl₂) = m(CaCl₂) ÷ M(CaCl₂)
n(CaCl₂) = 82 g ÷ 111 g/mol
n(CaCl₂) = 0.74 mol; amount of calcium chloride
V(CaCl₂) = 812 mL = 0.812 L; volume of calcium chloride
c(CaCl₂) = n(CaCl₂) ÷ V(CaCl₂)
c(CaCl₂) = 0.74 mol ÷ 0.812 L
c(CaCl₂) = 0.909 mol/L = 0.909 M; molarity of calcium chloride
Calcium chloride is a inorganic salt with ionic bonds between calcium and chlorine. It is a colorless crystalline solid at room temperature, highly soluble in water.
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bro i need help asap
Chemically speaking, how does applying hot dog mustard to a coin detect the presence of silver metal
Answer:
A black spot will remain on the silver coin, but not on the nonsilver coin. Mustard naturally contains sulfur compounds, and sul- fur reacts with silver to form a black precipi- tate of silver sulfide (Ag2S)
Explanation:
Students conducted an analysis of baking soda in chemistry lab. During the activity, they had to calculate the mass in
grams of the baking soda being used. Some student data appears in the table. At the end of the activity, the teacher
told the students that the actual mass of baking soda was 0.45 grams. Which student had the most accurate and
precise data?
The student that had the most accurate and precise data is Mel (option D).
What is accuracy and precision?Accuracy is the degree of conformity of a measure to a true or standard value i.e. closeness to a standard or true value.
On the other hand, precision is the ability of a measurement to be reproduced consistently i.e. the closeness of measured values.
According to this question, students calculated the mass in grams of the baking soda being used.
It can be said that Mel, which measured the following values: 0.44g, 0.46g, 0.45g had the most accurate and precise value because they are both close to themselves and the true value.
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Answer:
D
Explanation:
Mel
A chemist heats a 215-g sample of iron from 25.0°C to 90.0°C. How much heat did the iron absorb? The
specific heat capacity of iron is 0.45 J/g°C.
A 215-g sample of iron is heated by a chemist from 25.0°C to 90.0°C and 6.3 kJ of heat are absorbed by the iron (q).
What is meant by specific heat?Also known as specific heat, this is the quantity of energy required to increase a substance's temperature by 1 degree Celsius in one gram. The units of specific heat are typically calorie or joules a gram per degree Celsius. As an illustration, the specific heat of water is 1 calorie (4.186 joules) each gram per degrees C.
Briefing:q = m × C × ΔT
q = m × C × (T[tex]_f[/tex] - T[tex]_i[/tex]),
q is the quantity of heat energy a substance gains or loses (J)
m = mass of sample (g)
C = specific heat capacity (J °C-1 g-1)
T[tex]_f[/tex] = final temperature (°C)
T[tex]_i[/tex] = initial temperature (°C)
Thus:
q = (215 g) × (0.45 J oC-1 g-1) × (90 - 25)°C
q = 6288.75 J
q = 6288.75 J = 6.3 kJ
The iron absorb 6.3 kJ of heat (q).
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Calculate the ph of a buffer solution obtained by dissolving 17.0 g of kh2po4(s) and 30.0 g of na2hpo4(s) in water and then diluting to 1.00 l.ph=
The ph of a buffer solution was obtained by dissolving 17.0 g of [tex]KH_{2} PO_{4}[/tex] and 30.0 g of [tex]Na_{2} HPO_{4}[/tex] in water and then diluting to 1.00L is 7.43.
We will apply the Henderson-Hasselblach equation to determine the pH:
pH= pKa + Log [A/AH]
when [tex]Na_{2} HPO_{4}[/tex] molar mass is 142 g/mol
A is the conjugate base [tex]HPO_{4} ^{-}[/tex] ions and as a result,
[tex][A]= \frac{30g}{142 g/mol}[/tex]
= 0.211 M
[tex]KH_{2} PO_{4}[/tex] has a molar mass of 136 g/mol.
Given that AH is the weak acid [tex]H_{2} PO_{4} ^{-}[/tex] ion,
[AH] = [tex]\frac{17.0 g}{136 g/mol.}[/tex]
= 0.125 M
and with [tex]H_{3} PO_{4}[/tex] having a pKa value of 7.21
then, substituting
∴ pH = 7.21 + log (0.211 / 0.125)
= 7.21 +0.227
=7.43
The pH of a buffer solution is 7.43.
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Calculate the ratio of the concentration of formate to formic acid required in a buffer system of ph 4.25. the pka of formic acid is 3.75. ratio = ________________.
The ratio of the concentration of formate to formic acid required in a buffer system is 3.16 : 1.
pH = 4.25; pH of the solution
pKa = 3.75
Henderson–Hasselbalch equation: pH = pKa + log(cs/ck)
4.25 = 3.75 + log(cs/ck)
log(cs/ck) = 4.25 - 3.75
log(cs/ck) = 0.5
cs/ck = 10∧(0.5)
cs/ck = 3.16; ratio of formate to formic acid
A buffer can be defined as a substance that prevents the pH of a solution from changing by either releasing or absorbing H⁺ in a solution.
Buffer is a solution that can resist pH change upon the addition of an acidic or basic components and it is able to neutralize small amounts of added acid or base, pH of the solution is relatively stable.
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1. Calculate the volumes of the samples used in Procedure step 2. Record the calculated
volumes in Table 2.2. Why could we not find the volume of the bolt by this method?
From the table shown in the question;
Volume of aluminum bar = 15.52 cm^3
Volume of the rod = 23.8 cm^3
The volume of the iron bolt can only be obtained by the displacement method.
What is volume?The term volume refers to the space that is occupied by an object. We know that the volume of an object could be obtained in different ways depending on the nature of the object. If the object is a solid, we could look at the dimensions of the solid or we could use the dimensions of the solid. The actual method that we finally use is peculiar to the object whose volume we intend to measure.
In order to obtain the volume of the aluminum bar;
Volume = length * width * height
Volume = 9.7 * 1.6 * 1.0 = 15.52 cm^3
In order to obtain the volume of the rod;
Volume = Area * length
Volume = 3.14 * (1.7)^2/4 * 10.5
Volume = 23.8 cm^3
We can not obtain the volume of the iron bolt by this method because it is an irregular solid hence we have to use the displacement method.
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Which of following can form hydrogen bonds with water molecules?
(1) na
(2) ch 3cooh
(3) c 2h 6
(4) ch 3nh 2
Of the four species, only
CH₃COOH and CH₃NH₂ hydrogen bond
COOH can be formed via Water H and NH₂
Group. The species Na+ can be solvated with water through ionic dipole interactions rather than hydrogen bonding. As for C₂H₆ it can interact with water only by weak London dispersion forces
Hydrogen bonding refers to the attractive forces that occur between hydrogen atoms and highly electronegative atoms such as nitrogen, oxygen, and fluorine. These can occur intramolecularly or intermolecularly, depending on whether they occur in different molecules or in the same molecule. In general, hydrogen bonds are stronger than van der Waals forces, but weaker than ionic and covalent bonds.
Of the four species, only CH₃COOH and CH₃NH₂ hydrogen bond COOH can be formed via Water H and NH₂ Group. The species Na+ can be solvated with water through ionic dipole interactions rather than hydrogen bonding. As for
C₂H₆, it can interact with water only by weak London dispersion forces.
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the small particles within the atom
are known as?
Answer:
molecules
Explanation:
hope i help :))
Does vb theory indicate that the diatomic molecule he2 is a viable species? rationalize your answer
VB theory does not indicate that the diatomic molecule He₂ is a viable species.
Helium has atomic number 2, it has 2 protons and 2 electrons.
Electron configuration of helium atom: ₂He 1s².
Helim (He) is a noble gas.
Noble gases (group 18) are in group 18: helium (He), neon (Ne), argon (Ar), krypton (Kr), xenon (Xe) and radon (Rn). They have very low chemical reactivity.
Noble gases have very stable electron configuration and does not need to gain electrons, only when they gain energy.
Valence bond (VB) theory explains chemical bonding.
Helium atom is stable and does not form molecule.
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Describe scientific method
The scientific method is an experimentation technique used to investigate data and answer questions. All sciences, including chemistry, physics, geology, and psychology, follow the scientific method. These scientists ask various questions and conduct different tests. They do, however, apply the same fundamental technique to arrive at logical and evidence-based conclusions. Scientists change the scientific method when direct experimentation is not possible. Understanding the phases of the scientific process can assist you in focusing your scientific inquiry and working through your observations and data to get the best possible response.
The scientific method consists of seven phases.
1. Pose a query. The scientific approach begins with posing a question that you want answered.
2. Conduct research.
3. Create your theory.
4. Experiment to put your hypothesis to the test.
5. Make a note of it.
6. Analyze the findings and reach a conclusion.
7. Display your results.
How does the idea of quantized energy apply to Bohr’s atomic model?
Answer:the electrons can possess only certain discrete energy values; values between those quantized values are not permitted.
Explanation:Both involve a relatively heavy nucleus with electrons moving around it, although strictly speaking, the Bohr model works only for one-electron atoms or ions.
What mass of hydrogen is needed to produce 5.0 g of tungsten according to the equation: WO3 + 3 H2 --> 3 H2O + W
The mass of hydrogen that is needed to produce 5.0 g of tungsten is 0.0273 grams.
What is tungsten?Tungsten is a chemical element that is used with steel to make the steel strong.
The equation:
WO₃ + 3H₂ --> 3H₂O + W
Given, that the mass is 5.0 g of tungsten
The molar mass of tungsten is 183.84 g/mol
Moles = mass / molar mass
5.0 / 183.84 = 0.0271 moles
Then, the Mass of hydrogen
The molar mass of hydrogen is 1.00784
Moles of tungsten are 0.0271 moles
molar mass x moles
1.00784 x 0.0271 moles
0.0273
Thus, the mass of hydrogen needed is 0.0273 grams.
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The densities of copper, silver, iron, and magnesium are 8.96,10.5,7.89,1.74g\slashcm3 in that order. you are given 5.00 grams of each metal. which one has the largest volume?
The element that has the largest volume is Magnesium
The density formula and the procedure we will use is:
d = m/v
Where:
v= volumed= densitym= massInformation about the problem:
d(copper)= 8.96 g/mld(silver)= 10.5 g/mld(iron)= 7.89 g/mld(magnesium )= 1.74 g/mlm = 5 gv = ?Applying the density formula and clearing the volume we get:
d = m/v
v = m/ d
v(copper) = m/d(copper)
v(copper) = 5 g/ 8.96 g/ml
v(copper) = 0.5580 ml
v(silver) = m/d(silver)
v(silver) = 5 g/ 10.5 g/ml
v(silver) = 0.4762 ml
v(iron) = m/d(iron)
v(iron) = 5 g/ 7.89 g/ml
v(iron) = 0.6337 ml
v(magnesium ) = m/d(magnesium )
v(magnesium ) = 5 g/ 1.74 g/ml
v(magnesium ) = 2.8736 ml
What is density?It is a physical quantity that expresses the ratio of the body mass to the volume it occupies.
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When performing an extraction with between an aqueous solution and organic solution what determines which layer ends up the bottom layer in the separatory funnel ?.
When performing an extraction between an aqueous solution and an organic solution or organic compound, density will determine the layer ending up at the bottom of the separation funnel.
In chemistry, a separatory funnel is a kind of funnel that separates two immiscible liquids.
It is a transparent funnel and when two immiscible liquids i.e aqueous and organic solution is poured into it, and then allowed to stand, after a while a distinguished layer is formed setting them apart from each other.
Due to the difference in density, the extraction becomes easier as the aqueous layer has a low density and stays at the top while the organic layer is at the bottom.
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At a track meet the officials use a timer to determine the amount of time it takes to complete each running event. If the timer does not function correctly and adds one second onto each runner's time this is an example of a random error. true or false
Answer:
This is an example of a random error because the timer is adding an extra second onto each runner's time, which is not an accurate representation of their true time. This error is not systematic, meaning that it does not affect all runners in the same way or add the same amount of time onto their times.
Explanation:
Give me brainliest if that helped :)
4. How many seconds in 1.0 yr?
Answer:
Around 31536000 seconds (depending on which days you want to exclude)
Explanation:
60 seconds in 1 minute
60 minutes in an hour
24 hours in 1 day
365 days in 1 year
60 * 60 * 24 * 365
Why do industries use metallic compounds to make wires?
Select all that apply.
Responses
metallic compounds often have high luster
metallic compounds often have high luster
metallic compounds are ductile
metallic compounds are ductile
metallic compounds have high boiling points
metallic compounds have high boiling points
metallic compounds are good conductors of electricity
metallic compounds are good conductors of electricity
Answer:
metallic compounds are good conductors of electricity.
metallic compounds have high boiling points
What is the formula for Newtons second law of motion 
Answer: F=m*a
Explanation: Force equals mass times acceleration!
I hope this helps!
If+a+monoprotic+weak+acid,+ha,+is+80%+ionized+at+a+concentration+of+0.05+m,+what+is+the+ph?
The pH of a monoprotic weak acid which is 80 percent ionised with a strentght of 0.05m is 1.39
What is pH ?
A scale called pH , which traditionally stood for "potential of hydrogen" (or "power of hydrogen"), is used in chemistry to describe how acidic or basic an aqueous solution is. Lower pH values are recorded for acidic solutions (solutions with higher H+ ion concentrations) than for basic or alkaline solutions. The concentration of hydrogen ions in the solution is shown inversely by the pH scale, which is logarithmic.
pH + pOH = 14
[H + ]=0.05×0.80=0.04M
Now, Here, pH=−log[H + ]=−log0.04=1.39
The pH of a monoprotic weak acid which is 80 percent ionised with a strentght of 0.05m is 1.39
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Boron (B) is an element or a compound?
Answer:
Its a element
Explanation:
Boron is made of atoms.
Answer:
element is the answer for your question
Explanation:
because i took a test on this
Which occurs during a synthesis reaction?
●
A. Compounds break down into simpler products.
B. Two or more substances combine to form a more complex substance.
C. One element replaces another element in a compound.
D. Two elements in different compounds trade places.
The amount of energy that must be absorbed or lost to raise or lower the temperature of 1gram of liquid water by 1°c.
The amount of energy that must be absorbed or lost to raise or lower the temperature of 1 gram of liquid water by 1°C is 1 calorie.
A calorie (cal), or a small calorie, is the amount of energy needed to heat one gram of water by one degree Celsius. It is used to express the amount of energy released in a phase change or chemical reaction.
One small calorie is approximately 4.2 joules.
A calorie is a unit of energy.
A calorie was originally part of the metric system (SI), but now it is replaced with the joule (J).
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What is the mass of 7.00 mol of hydrogen peroxide (h2o2)? 0.206 g 0.389 g 126 g 238 g
The mass of the hydrogen peroxide is 238 g.
Hydrogen peroxide at room temperature stays in liquid form. It has a bitter taste and is colorless. It is an important regent used in pharmaceutical and other industries. It also has medical use. It can be used as an antiseptic.
The number of miles in the hydrogen peroxide is n.
n = 7 mol
The molar mass of hydrogen peroxide is,
The molar mass of hydrogen peroxide = Molar mass of hydrogen + Molar mass of oxygen
= 2 × 1 + 2× 16
= 34 g/mole
The molar mass of hydrogen peroxide is 34 g/mole.
The mass of the hydrogen peroxide is,
[tex]Number \: of \: moles = \frac{ Mass }{ Molar \: mass}[/tex]
[tex]n = \frac{m}{M} [/tex]
m = n × M
m = 7 × 34
m = 238 g.
Therefore, the mass of the hydrogen peroxide is 238 g.
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HELP.....................................................
Answer:
I believe that would be a liquid.
Explanation:
A solution is prepared by dissolving 50.4 g sucrose (c12h22o11) in 0.332 kg of water. the final volume of the solution is 355 ml. for this solution, calculate the molarity.
The molarity of the sucrose solution is found to be 0.4146M
The term "molarity" (also known as "molar concentration," "amount concentration," or "substance concentration") refers to the amount of a substance per unit volume of the solution and is used to describe the concentration of a chemical substance, specifically a solute, in a solution.
Given:
Mass of sucrose, m = 50.4g
Volume of solution, v = 355ml = 0.355L
Molecular weight of sucrose = 342.3g/mol
To find:
Molarity, M = ?
Formula:
Molarity = amount of solute, n (moles) / volume of solution, v (L)
Calculations:
No. of moles of sucrose, n = mass of sucrose x (1 mole / molecular weight of sucrose)
n = 50.4 x (1/342.3)
n = 0.1472 moles
M = 0.1472 / 0.355
Molarity = 0.4146M
Result:
The sucrose solution has a molarity of 0.4146M.
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The number of neutrons present in the nucleus of an average atom of any given element is best estimated by:_______-
The number of neutrons present in the nucleus of an average atom in any given element is best estimated by subtracting the number of protons from the mass number.
All atoms contain protons, neutrons and electrons, although the amount differs for each atom. Neutrons are located in the nucleus of each atom. They were first discovered by James Chadwick. They are also neutral and have no charge.
Apart from neutrons, positively charged protons are present in the nucleus. The number of protons is equal to the atomic number, usually denoted with the letter Z.
The mass number or atomic mass is the total mass of the atom. It is calculated by adding the number of protons to the number of neutrons. Electrons are really light and have negligible mass (about 1/1840 times the mass of a proton), so we don't add their masses when calculating mass number. So, to get the number of neutrons in an atom, subtract the number of protons from the mass number.
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What byproduct of fermentation induces the coagulation of casein into the cheese curd? select one:
a. carbon dioxide
b. lactic acid
c. ethyl alcohol
d. acetic acid
The byproduct of fermentation tha induces the coagulation of casein into the cheese curd is b. lactic acid.
Lactic acid causes the milk proteins casein to form into a cheese curd, because it increase acidity and the enzymes prefer for the coagulation.
Producing cheese curds is one of the first steps of makint a cheese.
Swiss cheese is a cheese made in Switzerland.
Swiss cheese is, usually, a semihard cheese made from cows milk with a characteristic holes.
Fermentation of milk is a metabolic process in which lactic acid (CH₃CHOHCOOH) and carbon dioxide are produced from sugar lactose:
C₅H₁₂O₆ → CH₃CHOHCOOH + C₂H₅OH + CO₂
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convert 3 hrs into sec by dimensional analysis
[tex]=3h\ x\ \frac{60 \min}{1h }\ x\ \frac{60\ sec}{1\ min}[/tex]
[tex]=10800\ sec[/tex]
Set up your equation so that your units cancel until you get to the unit you want. Hours and hours would cancel, and min and min would cancel, leaving you with sec which is the unit you want.
Remember: they can only cancel if one is on top and the other is on the bottom.
Answer:
1hr=60minutes
1min=60 seconds
then we have to convert 3hrs into seconds
now,
3*60*60=10,800
The specific heat capacities of lead and magnesium are (in j/g-degree): 0.128 and 1.024. Calculate the molar heat capacities of these metals.
Given,
Specific heat capacity of lead = 0.128 J/g
Specific heat capacity of magnesium= 1.024 J/g
Molar heat capacity is the amount of heat needed to raise the temperature of 1 mole of a substance by 1 unit.
So,
For calculating molar heat capacity we need to multiply the specific heat capacities of the metals with their atomic masses.
Atomic mass of lead (Pb) = 207
Atomic mass of magnesium (Mg) = 24
∴ Molar heat capacity = specific heat capacity x atomic mass
Molar heat capacity of Pb=0.128 x 207 = 26.5 J
Molar heat capacity of magnesium (Mg) = 1.024 x 24 = 24.5
Hence , molar heat capacities of lead and magnesium are 26.5 and 25.5 Joules respectively.
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Molar heat capacities of lead and magnesium is 26.49 and 24.5 Joules, respectively.
Given,
Lead has a specific heat capacity of 0.128 J/g.
Magnesium has a specific heat capacity of 1.024 J/g.
The quantity of heat required to increase the temperature of 1 mole of a substance by 1 unit is known as its molar heat capacity.
So, We must multiply the specific heat capacities of the metals by their atomic masses in order to determine their molar heat capacities.
Lead (Pb) has an atomic mass of 207.
Magnesium (Mg) has an atomic mass of 24.
Specific heat capacity multiplied by atomic mass gives the molar heat capacity.
Pb has a 26.5 J molar heat capacity (0.128 x 207).
Magnesium's (Mg) molar heat capacity is equal to 1.024 x 24.
Thus, lead and magnesium have molar heat capacities of 26.49 and 24.5 Joules, respectively.
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