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3 years ago

Which equation best expresses the relationship between pressure and volume for gas?

Chemistry

2 answers:

pshichka [43]3 years ago

6 0

It won't be possible for me to answer this question if there is no context. I tried to find a similar question and I came up with one. The problem is shown in the attached picture. From the given choices, all their units are atm*mL. So, that means that P*V. The answer could only be (2) or (4). Let's try the data in the table to find out.

PV = (0.5 atm)(1000 mL) = 500 atm*mL
PV = (1 atm)(500 mL) = 500 atm*mL
PV = (2 atm)(250 mL) = 500 atm*mL
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<em>Thus, the answer is choice (2).</em>

irina1246 [14]3 years ago

5 0

I think this is the question.

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An unknown compound, X is thought to have a carboxyl group with a pKa of 2.0 and another ionizable group with a pKa between 5 an

Westkost [7]

Answer:

7.3

Explanation:

By Henderson Hasselbalch equation we can calculate the pH or the pOH of a solution by its pKa. Remember that $pH = -log[H^{+}]$ , and pKa = -logKa. Ka is the equilibrium constant of the acid.

Henderson Hasselbalch equation :

$pH = pKa - log \frac{[HA]}{[A^{-}]}$

Where [HA] is the concentration of the acid, and $[A^{-}]$ is the concentration of the anion which forms the acid.

So, acid X, has two ionic forms, the carboxyl group and the other one. First, we have 0.1 mol/L of the acid, in 100 mL, so the number of moles of X

n1 = (0.1 mol/L)x(0.1 L) = 0.01 mol

When it dissociates, it forms 0.005 mol of the carboxyl group and 0.005 mol of the other group. Assuming same stoichiometry.

Adding NaOH, with 0.1 mol/L and 75 mL, the number of moles of $OH^-$ will be

n2 = (0.1 mol/L)x(0.075 L) = 0.0075 mol

So, the 0.0075 mol of $OH^-$ reacts with 0.005 mol of carboxyl, remaining 0.0025 mol of $OH^-$ , which will react with the 0.005 mol of the other group. So, it will remain 0.0025 mol of the other group.

The final volume of the solution will be 175 mL, but both concentrations (the acid form and ionic form) have the same volume, so we can use the number of mol in the equation.

Note that, the number of moles of the acid form is still 0.01 mol because it doesn't react!

So,

$6.72 = pKa - log \frac{0.01}{0.0025}$

6.72 = pKa - log 4

pKa - log4 = 6.72

pKa = 6.72 + log4

pKa = 6.72 + 0.6

pKa = 7.3

8 0

4 years ago

Calculate the average atomic mass for the following element given information about the relevant isotopes: (Isotope 1) Mass = 20

polet [3.4K]

Answer:

The average atomic mass of given element is 20.18 amu.

Explanation:

Given data:

Abundance of 1st isotope mass 20 amu = 90.92%

Abundance of 2nd isotope mass 21 amu = 0.257%

Abundance of 3rd isotope mass 22 amu = 8.82%

Average atomic mass = ?

Solution:

Average atomic mass = (abundance of 1st isotope × its atomic mass) +(abundance of 2nd isotope × its atomic mass) + (abundance of 3rd isotope × its atomic mass) / 100

Average atomic mass = (90.92×20)+(0.257×21)+(8.82×22) /100

Average atomic mass = 1818.4 + 5.397 +194.04 / 100

Average atomic mass = 2017.819 / 100

Average atomic mass = 20.18 amu.

The average atomic mass of given element is 20.18 amu.

5 0

3 years ago

List two examples of objects at home that use chemical energy and describe what the chemical energy is being transformed into.

mr_godi [17]

Answer: Batteries and Food

Explanation:

On the batteries that we use for example for a watch in the kitchen, occurs a chemistry reaction, called redox between Zn and MnO2. The Zn is oxidized (in the anode) and the MnO2 is reduced (in the cathode). In the oxidation, the athom loses electrons and in the reduction the opposites.

Regarding the chemical reactions that occur in the food that we consume, the hydrolisis that occurs in the stomach. The hydrochloric acid that is secreted in the stomach allows the activation of an enzyme, pepsinogen, which hydrolyzes the proteins present in the food consumed. That is, it hydrolyzes the peptide bonds of the proteins, which is between an amino and carboxyl bond of each amino acid that makes them up.

4 0

4 years ago

Can you guys help me with this one too

Mrrafil [7]

C I think not sure give it a try

4 0

3 years ago

Using scientific terms and knowledge, explain what might happen if you were to place an unopened can of Monster Energy drink in

Ksju [112]

Answer:

The heat could put stress on the metabolism, which could lead to dehydration. Energy drinks are designed to be stimulants and can give people a little edge when playing sports. They can also be dangerous because stimulants can increase body temperature and pose a hypothermia threat. But if you leav it in the stove then it the liquid would eventually evaporate and the sugar would be left. But, that also would leave the rest of the sugar which would look like tar or slime.

8 0

3 years ago