To prepare 100 mL of a 0.200 M acetate buffer, pH 5.00, you will need acetic acid, 3M HCl, 3 M NaOH, and a pH meter.
1. Calculate the amounts of acetic acid and sodium acetate needed to make the buffer.
To prepare 0.200 M acetate buffer, you will need 0.2 moles of acetic acid and 0.2 moles of sodium acetate.
Moles of acetic acid = 0.2 moles
Moles of sodium acetate = 0.2 moles
2. Calculate the volume of acetic acid and sodium acetate needed to make the buffer.
Volume of acetic acid = [tex]0.2 moles *(17.30 mL/mole) = 3.46 mL[/tex]
Volume of sodium acetate =[tex]0.2 moles * (22.06 mL/mole) = 4.41 mL[/tex]
3. Calculate the amount of HCl and NaOH needed to adjust the pH to 5.00.
First, the pKa of acetic acid needs to be calculated.
pKa of acetic acid = 4.76
Now, the amount of HCl and NaOH needed to adjust the pH of the buffer can be calculated using the Henderson-Hasselbalch equation.
Henderson-Hasselbalch equation:
pH =[tex]pKa + log\frac{[base]}{[acid]}[/tex]
Rearranging the equation to calculate [base],
[base] =[tex][acid] * 10^{(pH - pKa) }[/tex]
[NaOH] =[tex][HCl] * 10^{(pH - pKa) }[/tex]
[HCl] =[tex][NaOH] * 10^{(pKa - pH) }[/tex]
[HCl] =[tex]0.2 M * 10^{(4.76 - 5.00) }[/tex]
[HCl] = [tex]0.162 M[/tex]
[NaOH] =[tex]0.2 M* 10^{(5.00 - 4.76) }[/tex]
[NaOH] = [tex]0.238 M[/tex]
4. Calculate the volume of HCl and NaOH needed to adjust the pH to 5.00.
Volume of HCl = [tex]0.162 M * (17.30 mL/mole) = 2.79 mL[/tex]
Volume of NaOH = [tex]0.238 M *(22.06 mL/mole) = 5.25 mL[/tex]
5. Prepare the buffer.
To prepare the buffer, add 3.46 mL of acetic acid, 4.41 mL of sodium acetate, 2.79 mL of HCl, and 5.25 mL of NaOH to a volumetric flask, and make up to 100 mL with distilled water.
6. Measure the pH of the buffer and adjust as necessary.
Using a pH meter, measure the pH of the buffer and adjust with additional HCl or NaOH as necessary to reach a pH of 5.00.
Once the desired pH is reached, the buffer is ready to use.
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complete question:How do you prepare 100 mL of 0.200 M acetate buffer, pH 5.00, starting with pure liquid acetic acid and solutions containing 3 M HCl and 3 M NaOH furthermore 15 points?
How does the amount of rain
affect the number of worms on
the sidewalk?
On the surface, they have a lot more mobility.
Earthworms must remain moist, which is an issue.
Usually, if they were above ground, they would start to dehydrate. However, when it rains, the surface is sufficiently damp for worms to survive and maintain their moisture levels.
Answer:
worms like to bury tunnels underground, so when they hear the 'pit pat' of the rain, they try to go closer to the rain so that they can make better tunnels faster.
My opinion is that all animals have feelings, depending on the size of their brain. You might think this is hilarious but, I think worms know that rain can help them move faster to make tunnels, but since they have such a small brain, they think they should make tunnels above ground where water is soaking.
Explanation:
Have you ever seen a worm in puddles? Well, its because they think its easier to build in water. Its hilarious I know.
I hope this helped!
what part of the neuron receives input in the form of chemical stimuli?
Dendrites is a part of the neuron receives input in the form of chemical stimuli.
Chemical stimuli, such as neurotransmitters, are received by the dendrites of a neuron. Dendrites are the branched extensions of a neuron that receive signals from other neurons or from sensory receptors. When a neurotransmitter molecule binds to a receptor on the dendrite, it can trigger an electrical signal (action potential) that travels down the length of the neuron and can cause the release of neurotransmitters from the axon terminal, which in turn can stimulate the dendrites of other neurons. Thus, dendrites play a critical role in integrating the signals received by a neuron and transmitting them to the cell body (soma) and ultimately to the axon, where they can be propagated to other neurons.
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The refractive index refers to the ability of a substance to a) bend light b) reflect light c) absorb light d) convert light to heat energy. Solution.
The capacity of a substance to bend light is described by its refractive index. Refraction is the bending of light as it travels through a medium having a varying refractive index.
Describes how much light is twisted when it travels through a substance, the refractive index is a fundamental feature of materials. It is described as the difference between the speed of light in a substance and the speed of light in a vacuum. This figure, which varies depending on the substance, expresses how much light the substance slows down .Optics, spectroscopy, and materials science are just a few of the fields in which the refractive index is crucial. The use of the refractive index to control the behaviour of light in the construction of lenses, prisms, and other optical components is crucial. The refractive index, in addition to being an important design element for optical devices.
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Write the rate law expected for this mechanism. What is the overall balanced equation for the reaction? What are the intermediates in the proposed mechanism?
Answer:
The rate law for the overall reaction is given by the rate-determining step, which is the slowest step in the mechanism. In this case, the slowest step is the first step, where C4H9Br is converted to C4H9+ and Br-. Hence, the rate law for the overall reaction can be expressed as:
Rate = k[C4H9Br]
where k is the rate constant for the first step.
The overall balanced equation for the reaction is:
C4H9Br + H2O --> C4H9OH + HBr
The intermediates in the proposed mechanism are C4H9+ and C4H9OH2.
What do resonance structures indicate?
Resonance structures are employed when a single Lewis structure for a molecule is insufficient to completely capture the bonding that occurs between adjacent atoms in relation to empirical data on the actual bond lengths between those atoms.
A group of two or more Lewis structures known as resonance structures explain the electronic bonding of a single polyatomic species, including fractional bonds and fractional charges. Unable to be described by a single Lewis formula with an integral number of covalent bonds, delocalized electrons can be described using resonance structures.
The bonding in certain molecules or ions can occasionally defy description by a single Lewis structure, even when formal charges are taken into account. When the bonding cannot be encapsulated by a single Lewis formula, resonance is a means to describe delocalized electrons inside specific molecules or polyatomic ions. There are several contributing structures that depict a molecule or an ion with such delocalized electrons (also called resonance structures or canonical forms).
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The volume of 160. G of CO initially at 273 K and 1. 00 bar increases by a factor of two in different processes. Take CP,m to be constant at the value 29. 14 Jmol−1K−1 and assume ideal gas behavior. The temperature of the surroundings is 273 K.
A) Calculate ΔSsurroundings in an adiabatic reversible expansion.
B) Calculate ΔS in an adiabatic reversible expansion.
C) Calculate ΔStotal in an adiabatic reversible expansion.
D) Calculate ΔSsurroundings in an expansion against Pexternal = 0.
E) Calculate ΔS in an expansion against Pexternal = 0.
F) Calculate ΔStotal in an expansion against Pexternal = 0.
G) Calculate ΔSsurroundings in an isothermal reversible expansion.
H) Calculate ΔS in an isothermal reversible expansion.
I) Calculate ΔStotal in an isothermal reversible expansion.
Determine what processes are spontaneous.
1) adiabatic reversible expansion 2) expansion against Pexternal =0 3)isothermal reversible expansion
Adiabatic and isothermal reversible expansions because they add to the system and environment in a self-expanding manner. is not spontaneous because it does not increase the entropy of the system and environment.
A) ΔEnvironment = -ΔH/T = 0 (adiabatic process)
B) ΔS = nR ln 2 = 0.693 J/K
C) ΔTotal = ΔS ΔEnvironment = 0.693 J/K environment = 0.693 J/K not heat = Δ
D) K environment = Δ exchange = 0. . medium at constant pressure
E) ΔS = nR ln 2 = 0.693 J/K
F) ΔSum = ΔS ΔMedium = 0.693 J/K
G) ΔMedium = -Q/T = n / n / RTln J /0K6.
H) ΔS = 0 (isothermal process)
I) ΔTotal = ΔS ΔEnvironment = -0.693 J/K
Adiabatic and isothermal reversible expansions because they add to the system and environment in a self-expanding manner. is not spontaneous because it does not increase the entropy of the system and environment.
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how many grams of ethanol, c2h5oh, are required to make a 7.1 molar solution using 160.0 ml of water? (molar is the term chemistry and biologists use for a solution of that molarity, no teeth involved)
From the given information, 52.55 grams of ethanol are required to make a 7.1 M solution using 160.0 ml of water.
To determine how many grams of ethanol are required to make a 7.1 M solution using 160.0 ml of water, we first need to calculate the number of moles of ethanol required.
Molarity is defined as moles of solute per liter of solution, so we can use the following formula to calculate the number of moles of ethanol:
Molarity = moles of solute / volume of solution
Rearranging the formula to solve for moles of solute gives:
moles of solute = Molarity x volume of solution
Substituting the values, we get:
moles of ethanol = 7.1 mol/L x (0.160 L) = 1.136 mol
Now we can use the molecular weight of ethanol to convert moles to grams:
molecular weight of ethanol = 46.07 g/mol
mass of ethanol = moles of ethanol x molecular weight of ethanol
mass of ethanol = 1.136 mol x 46.07 g/mol
mass of ethanol = 52.55 g
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instruments scientist use in reference to atoms and what are some new advances that has bettered the environment?
In order to examine many details inside cells, an electron microscope can magnify objects by approximately 500,000 times. A variety of electron microscopes exist. Nanoparticles and atoms can be observed using a transmission electron microscope.
The quantum mechanical model, which draws on concepts from Schrödinger, Pauli, Heisenberg, and other thinkers, is the appropriate one for atoms. It takes a lot of various things into account. Theoretically sound, it is the most frequently accepted model. A more accurate depiction of the structure of atomic clusters, where surface atoms vibrate more intensely than inside atoms, has been revealed thanks to new technology created by physicists to examine atomic vibration in microscopic particles.
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why are atomic absorption lines sharper than the absorption spectrum of a molecule dissolved in solution?
Atomic absorption lines are sharper than the absorption spectrum of a molecule dissolved in solution because Atomic spectra are pure electronic spectra.
Atomic spectra are pure electronic spectra where as molecular spectra are a combination of electronic, vibrational and microwave spectra which makes the absorption spectrum of a molecule broad.
The presence of spectral lines is explained by amount mechanics in terms of the energy situations of tittles, ions and motes. These energy situations depend on the figures of protons, electrons and neutrons in an snippet, and the limited set of configurations in which these essential patches can live( the set of amount figures). tittles prefer to be in their ground state, where all of the electrons are located as close to the nexus as possible.
Absorption lines do when an snippet, element or patch absorbs a photon with an energy equal to the difference between two energy situations. This causes an electron to be promoted into a advanced energy position, and the snippet, element or patch is said to be in an agitated state.
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borneol can also be oxidized to camphor using other oxidizing agents, such as sodium dichromate in acid. write a balanced equation for this oxidation (cr2o72- is reduced to cr3 ).
The oxidation of borneol to camphor using sodium dichromate in acid can be represented by the following balanced equation:
C10H18O + Na2Cr2O7 + 4H2SO4 → C10H16O + Cr2(SO4)3 + Na2SO4 + 4H2O
In this reaction, the sodium dichromate (Na2Cr2O7) is reduced to chromium(III) sulfate (Cr2(SO4)3), while the borneol (C10H18O) is oxidized to camphor (C10H16O) and sulfuric acid (H2SO4) is used as the acid catalyst. The reaction also produces sodium sulfate (Na2SO4) and water (H2O) as byproducts.
A balanced equation is a representation of a chemical reaction that shows the number of atoms of each element present in the reactants and products. A balanced equation follows the law of conservation of mass, which states that mass cannot be created or destroyed in a chemical reaction.
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As the water bends around a curve, it cuts into the the riverbank or stream bank, eroding the land. Why does the cutbank occur on the outside curve?
a
the water moves slower
b
the water moves faster
c
the water is deeper
d
the water is shallow
The cutbank occurs on the outside curve of the river or stream because of the Coriolis effect. The Coriolis effect results from the rotation of the earth and causes the water to move faster on the outside curve of the bend in the river or stream.
The Coriolis effect is a phenomenon caused by the Earth's rotation. It occurs when objects moving in a straight line appear to veer off in a different direction than expected due to the rotation of the Earth. The effect causes winds and ocean currents to be deflected to the right in the Northern Hemisphere and to the left in the Southern Hemisphere. This effect is important in meteorology, as it affects the direction of air masses and the strength of hurricanes.
This faster-moving water has more energy and erodes away more of the riverbank or stream bank than the slower-moving water on the inside of the bend, creating the cutbank.
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why is the molar constant volume heat capacity higher for f2 than for the other listed 2nd row diatomics?
F2 has a higher heat capacity due to its more intricate electrical structure and increased number of vibrational modes.
The amount of heat needed to raise the temperature of one mole of a substance by one degree Celsius at constant volume is known as the molar constant volume heat capacity (Cv). The atomic and molecular characteristics of the substance, such as its mass, structure, and vibrational modes, determine the value of Cv.
The energy needed to dissociate a bond between two atoms in a molecule is known as the bond dissociation energy (BDE). The link between two fluorine atoms can be broken with less energy because F2 has a lower bond dissociation energy than O2 and N2.
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magnesium and nitrogen react to form an ionic compound. predict which forms an anion, which forms a cation, and the charges of each ion. write the symbol for each ion and name them.
When magnesium and nitrogen react to form an ionic compound Magnesium (Mg) becomes a cation and Nitrogen (N) becomes a anion.
Mg2+ - magnesium cation or magnesium ion N3- - nitride anion or nitrogen ion.
Magnesium (Mg) is a metal that tends to lose two electrons when it reacts, becoming a cation with a charge of +2.
Nitrogen (N) is a non-metal that tends to gain three electrons when it reacts, becoming an anion with a charge of -3.
When magnesium and nitrogen react, the magnesium cation (Mg2+) and the nitrogen anion (N3-) combine to form the ionic compound magnesium nitride (Mg3N2).
The symbols and names for the ions are:
Mg2+ - magnesium cation or magnesium ion
N3- - nitride anion or nitrogen ion.
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question 5
pls help asap
The percent yield is 99%
What is the theoretical yield of the reaction?The theoretical yield of a chemical reaction is the maximum amount of product that can be produced from the given amounts of reactants, assuming complete conversion of all reactants to products and no loss of product during the reaction.
Number of moles of HCl = 73g/36.5 g/mol
= 2 moles
Number of moles of the Mg = 48 g/24 g/mol = 2 moles
If from the reaction;
1 mole of Mg reacts with 2 moles of HCl
2 moles of Hcl will react with 2 * 2/1
= 4 moles
Thus the HCl is the limiting reactant
We have that;
2 moles of HCl produces 1 mole MgCl2
Mass of the MgCl2 = 95 gPercent yield is;
73 g/120 g * 100/1
= 99%
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a 50.0 ml sample of gas at 20.0 atm of pressure is compressed to 40.0 atm of pressure at constant temperature. what is the new volume? 0.0100 ml 0.325 ml 25.0 ml 100. ml
Boyle's Law can be used to calculate the new volume of compressed gas at a constant temperature. The new volume of the compressed gas is 25.0 ml.
Using Boyle's Law to Calculate the New Volume of a Compressed GasWhen a gas is compressed at a constant temperature, Boyle's Law can be used to determine the new volume. Boyle's Law states that the pressure and volume of a gas are inversely proportional to each other when the temperature is held constant. The formula for Boyle's Law is P1V1 = P2V2, where P1 is the initial pressure, V1 is the initial volume, P2 is the final pressure, and V2 is the final volume. In this problem, a 50.0 ml sample of gas at 20.0 atm of pressure is compressed to 40.0 atm of pressure while the temperature is held constant. To find the new volume, we can use Boyle's Law and solve for V2. Substituting the given values into the formula, we get V2 = (P1/P2) * V1 = (20.0 atm / 40.0 atm) * 50.0 ml = 25.0 ml. Therefore, the new volume of the compressed gas is 25.0 ml.
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Answer:
The answer is 25.0 mL
20 ÷ 40 * 50 = 25
Hope This Helps!
what type of stress is most likely to occur at this boundary?
Shearing stress is most likely to occur at this boundary. Therefore, option A is correct.
What do you mean by shearing stress ?Shearing stress is defined as "a type of stress that acts coplanar with the material's cross-section." Shear stress is caused by shear forces. They are the same magnitude and opposite direction forces acting on opposite sides of a body. Shear stress is measured as a vector quantity.
A strike-slip fault is a dip-slip fault with a vertical dip in the fault plane caused by shear stresses. The San Andreas Fault in California is the world's most well-known strike-slip fault.
Thus, option A is correct.
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Your question is incomplete, most probably your question was
What type of stress is most likely to occur at this
boundary?
O shearing
syncline
tension
compression
how many grams of pbbr2 will precipitate when excess febr3 solution is added to 79.0 ml of 0.578 m pb(no3)2 solution?
Lead nitrate reacts with ferric bromide to give lead bromide and ferric nitrate. Here the weight of lead bromide precipitate will be 16.75g.
We can write the balanced reaction as follows,
3Pb(NO₃)₂ + 2FeBr₃ -----------> 3PbBr₂ + 2Fe(NO₃)₃
Here ferric bromide is in excess, so the limiting reagent will be lead nitrate.
Number of moles = molarity × volume in L
Number of moles of lead nitrate reacted = 0.578 × 0.079
= 0.0456
3 moles of lead nitrate reacts to form 3 moles of lead bromide.
So 0.0456 moles of lead nitrate gives 0.0456 moles of lead bromide.
Number of moles of lead bromide = 0.0456
Molar mass of lead bromide = 367.01
Mass of lead bromide formed = Number of moles× molar mass
= 0.0456 × 367.01 = 16.75g
So the mass of lead bromide precipitate will be 16.75g
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Given the following equation: 2H₂O2 → 2H₂O, how many moles of water
will be produced if 4 moles of hydrogen react?
1
2
0.5
4
The number of moles of water that will be produced if 4 moles of hydrogen peroxide react is 4 moles.
How to calculate number of moles using stoichiometry?Stoichiometry is the quantitative relationship between the reactants and products of a specific reaction or equation.
According to this question, hydrogen peroxide decomposes into water in the following equation:
2H₂O₂ → 2H₂O + O₂
Based on the above equation, 2 moles of hydrogen peroxide produces 2 moles of water.
This means that if 4 moles of hydrogen peroxide decomposes, 4 moles of water will also be produced.
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supposing the stock room wants to prepare 50.0 ml a 0.080 m solution of oxalic acid (h2c2o4). explain the entire process showing all the necessary calculations. ensure you are watching the significant figures.
Oxalic acid is a colorless, crystalline, organic compound belonging to the family of carboxylic acids. It is a strong dicarboxylic acid, with the molecular formula [tex]H2C2O4[/tex].
Given the volume of oxalic acid (h2c2o4) = 50mL
the concentration of oxalic acid = 0.080M
1. Calculate the moles of [tex]H2C2O4[/tex] needed for the solution:
Moles of [tex]H2C2O4[/tex] = (50.0 mL x 0.080 M) / 1000 mL = 0.004 moles
2. Calculate the mass of [tex]H2C2O4[/tex] needed for the solution:
Mass of [tex]H2C2O4[/tex] = 0.004 moles x 90.03 g/mol = 0.3609 g
3. Place 0.3609 g of [tex]H2C2O4[/tex] into a beaker and add 50.0 mL of distilled water.
4. Stir the solution to dissolve the [tex]H2C2O4[/tex].
5. If necessary, add more distilled water to make sure all of the oxalic acid has dissolved.
6. Measure the final volume of the solution and calculate the molarity:
Molarity = (0.004 moles x 1000 mL) / Final Volume (mL)
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how do i find the answer to What does Newton's first law of motion state?
Answer: Newton's first law states that every object will remain at rest or in uniform motion in a straight line unless compelled to change its state by the action of an external force. This tendency to resist changes in a state of motion is inertia.
Explanation:
Hoped that helped =)
The smallest part of an element that retains the chemical properties of the element. A electron B molecule C atom D proton
The smallest part of an element that retains the chemical properties of the element is the atom.
An atom is the basic unit of matter, composed of protons, neutrons, and electrons. Each atom has a specific number of protons, which determines the element it represents. Atoms are incredibly small, with a diameter of about 10^-10 meters. However, they are crucial to understanding the behavior of matter.
The properties of atoms determine the physical and chemical properties of the materials they compose. For example, carbon atoms are a fundamental building block of organic molecules, which are essential to life. Oxygen atoms are necessary for respiration and the combustion of fuels. Understanding the structure of atoms and their interactions is essential to fields like chemistry, physics, and materials science.
Scientists have developed models to represent the behavior of atoms, such as the Bohr model and the quantum mechanical model. These models help us understand how atoms bond and react with each other, which is vital for developing new materials, drugs, and technologies. Overall, atoms are the building blocks of matter and play a critical role in shaping the world around us.
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Select the effect of the size of a sample on the melting point (mp) measurement. Select the effect of the rate of heating on the melting point measurement. Select the effect that the degree of chemical purity of a substance has on the melting point measurement.
The size of a sample can affect the melting point measurement by either increasing or decreasing the observed melting point.
A larger sample size can lead to a broader melting range due to uneven heating, while a smaller sample size can result in a higher melting point due to surface effects.
The rate of heating can also affect the melting point measurement. A slow heating rate can result in a lower melting point due to partial decomposition, while a rapid heating rate can lead to a higher melting point due to kinetic factors.
The degree of chemical purity of a substance can affect the melting point measurement by increasing the observed melting point and narrowing the melting range. Impurities can lower the melting point and broaden the melting range due to eutectic effects.
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Perform the following operation
and express the answer in
scientific notation.
3.5x107x 1.8×10-3
[?]
[?]×10
By performing the following operation, the answer in scientific notation for 3.5 x 10⁷x 1.8×10[tex]^-3[/tex]×10 is 6.3×10⁵.
What is scientific notation?Scientific notation is defined as a way of expressing numbers which are too large or too small so that they can be easily written in decimal form. It can be referred to the scientific form or the scientific index form or even the standard form.
Base ten notation is used by scientists, engineers as it helps in simplification of arithmetic operations. It contains the significant figures which include all non-zero numbers , the zeroes between significant digits and zeroes which are needed to be significant.
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what type of bonding involves the transfer of electrons to form cations and anions?
An ionic bond is a stable bond created by the full transfer of the valence electron.
What is electron transfer?When an electron moves from one atom or molecule to another one of these chemical entities, this is known as electron transfer. When it comes to specific redox reactions involving the transfer of electrons, ET is a mechanistic description. ETRs are electrochemical processes.
ETRs are electrochemical processes. Transition metal complexes are frequently used in ET processes, which are relevant to respiration and photosynthesis. ET is a step in various commercial polymerization processes in organic chemistry. It serves as the basis for photoredox catalysis.
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The dotted arrow in this reaction is a placeholder. Select the arrow that best describes the relationship between the reactants and products. Identify the correct arrow descriptor.
Organic chemistry uses organolithium as a highly strong base. It produces an acid base reaction when combined with any acidic material extremely fast.
As a result of its rapidity and spontaneity, this reaction is practically irreversible.
Therefore, an irreversible arrow, in which most of the reaction is moving forward, best represents the relationship between the reactant and product ( i.e shifting towards product side)
Fluorides are often not utilised, and halide reactivity in these processes rises in the following order: Cl Br I. The second reaction's alkyl magnesium halides are known as Grignard Reagents after the French scientist Victor Grignard, who made the discovery and was awarded the Nobel Prize in 1912 for it. Similar reactions occur with the other metals indicated above, but Grignard and Alky Lithium Reagents are the most popular.
In the image below, the appropriate response is circled:
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What is the molar mass of CoCl2•6H20?
Answer:
the molar mass of CoCl2•6H2O is 238.05 g/mol.
Explanation:
The molar mass of CoCl2•6H2O can be calculated by adding the atomic masses of each element in the compound.
Here's the calculation:
Cobalt (Co): 58.93 g/mol
Chlorine (Cl): 35.45 g/mol (2 atoms) = 70.9 g/mol
Hydrogen (H): 1.01 g/mol (12 atoms) = 12.12 g/mol
Oxygen (O): 16.00 g/mol (6 atoms) = 96.00 g/mol
Therefore, the molar mass of CoCl2•6H2O is:
58.93 + 70.9 + 12.12 + 96.00 = 238.05 g/mol
So, the molar mass of CoCl2•6H2O is 238.05 g/mol.
Why are volumetric flasks, instead of beakers or graduated cylinders, used to prepare standard solutions from solids? Volumetric flasks are cheaper than beakers and graduated cylinders. There are volumetric flasks with various sizes for us to choose from. Beakers and graduated cylinders are not large enough to prepare a large volume of standard solution Volumetric flasks are calibrated to contain a precise volume of liquids at a particular temperature, Volumetric flasks are easier to handle than beakers or graduated cylinders.
The reason why volumetric flasks are used instead of beakers or graduated cylinders is that Volumetric flasks are calibrated to contain a precise volume of liquid at a particular temperature, making them more accurate than graduated cylinders.
Beakers and graduated cylinders are not as accurate or precise and are more suitable for approximate measurements. Additionally, volumetric flasks are designed to minimize evaporation and reduce errors due to meniscus formation, which can affect the accuracy of the final concentration of the standard solution. Therefore, volumetric flasks are the preferred choice for preparing standard solutions from solids.
Accuracy: Volumetric flasks are designed to deliver a precise volume of liquid at a specific temperature, making them more accurate than graduated cylinders.
Precision: Volumetric flasks are designed to minimize evaporation and errors due to meniscus formation, resulting in higher precision than graduated cylinders.
Consistency: Volumetric flasks deliver a consistent volume of liquid every time, while the volume of liquid delivered by graduated cylinders can vary depending on the user's technique.
Ease of use: Volumetric flasks are easy to use, with a simple and straightforward procedure for filling and measuring the liquid. Graduated cylinders require more technique and practice to use accurately.
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explain why the can behave as it does. as long as the water is heated gently, no condensed water vapor is visible as steam exits the can.
When water is heated in a closed container, such as a can, the pressure inside the container increases as the water vaporizes into steam.
The pressure inside the can builds up until it reaches a point where it is high enough to overcome the pressure of the surrounding air, at which point the steam is able to escape through a small opening.
This can cause the steam to expand rapidly and violently, which can lead to the can exploding or bursting open. the warm, moist air from your lungs condenses into visible water vapor when it comes into contact with the colder air outside.
In contrast, if the water in the can is heated too quickly or to a very high temperature, the pressure inside the can can become so high that the steam that escapes is very hot and under high pressure. This is why it's important to be cautious when heating water in a closed container, and to avoid heating it too quickly or to too high a temperature.
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When 127.68 g of brass at 163 °C are added to 150.00 g H₂O at 22.4 °C, the final
temperature
for brass.
of the brass and water is 32.6 °C. Calculate the value of the specific heat, c,
For water: q = cmΔT = 4.18 ∙ 150 (32.6 – 22.4) = 6395.4J
For brass: c = q / mΔT = 6395 / 127.68 (163 – 32.6) = 0.384 J / gC
What is water?
The global economy depends heavily on water. Agriculture uses over 70% of the freshwater that people use. 6.5% of the world's protein comes from fishing in salt and fresh water bodies, which has been and still is an important source of food for many regions of the world. Commodities (including oil, natural gas, and manufactured goods) are frequently transported across vast distances by boats over the oceans, rivers, lakes, and canals. In both industry and residences, huge amounts of water, ice, and steam are utilised for cooling and heating. Water is utilised extensively in industrial processes, as well as in cooking and washing, as it is a great solvent for a wide range of compounds, both mineral and organic.To know more about water, click the link given below:
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Looking at the cladogram, Hector determines that the tuatara and lizard both descended from common ancestor #2. Naiomi determines that the tuatara and lizard both descended from common ancestor #3.
Who is correct? Why?
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Question Image
A
Both Hector and Naiomi are correct. The tuatara and lizard both descended from common ancestor #2 and common ancestor #3.
B
Hector is correct, because both the tuatara and lizard evolved from common ancestor #2 based on the cladogram.
C
Naiomi is correct, because both the tuatara and lizard evolved from common ancestor #3 based on the
Answer: A
Explanation: Both Hector and Naiomi are correct because the sequence is Lizard → snake→ tuatara→ crocodile.
so, according to this sequence both tuatara and lizard descended from common ancestor.
