Question 1

Which of the following best describes the role of water in a solution of saltwater?

Accepted Answer

Water acts as the solvent, dissolving the salt.

Question 2

A student mixes 9.0 g of glucose ($$C_6H_{12}O_6$) in 500 mL of water. What is the molarity of the solution? (Molar mass of glucose = 180 g/mol)

Accepted Answer

$$0.10\ \mathrm{M}$$

Question 3

Which of the following pairs is an example of a gas dissolved in a liquid?

Accepted Answer

Carbon dioxide in water (soft drinks)

Question 4

If you have 150 mL of 0.750 M $$Na_2SO_4$$ and dilute it to a final volume of 500 mL, what is the final concentration?

Accepted Answer

$$0.225\ \mathrm{M}$$

Question 5

Which statement best explains why ethanol and water are miscible?

Accepted Answer

Both are polar and can form hydrogen bonds with each other.

Question 6

A Venti cup of Starbucks coffee (590 mL) contains caffeine at a concentration of 3.8 mM. How many millimoles of caffeine are in the cup?

Accepted Answer

$$2.24\ \mathrm{mmol}$$

Question 7

Which of the following is NOT a correct solute-solvent pair from the provided table?

Accepted Answer

CH$$_3CH$_2OH(l) in CO$_2(g)$$

Question 8

What volume of a 2.5 M HCl solution is needed to provide 0.15 mol HCl?

Accepted Answer

$$0.060\ \mathrm{L}$$

Question 9

Which of the following best describes the process shown when the valve between two containers of He and Ar is opened?

Accepted Answer

Diffusion, where gases mix spontaneously due to random motion.

Question 10

Which concentration unit is defined as moles of solute per liter of solution?

Accepted Answer

Molarity

Question 11

A solution is made by dissolving 1.0 mol of methanol in 100 mL of water at 295 K. What is the molarity of methanol in the solution?

Accepted Answer

$$10\ \mathrm{M}$$

Question 12

Which of the following statements about saturated fatty acids is correct?

Accepted Answer

They contain only single bonds between carbon atoms.

Question 13

If a solution is described as 'miscible,' what does this mean?

Accepted Answer

The solute and solvent mix completely in all proportions.

Question 14

Which of the following is a real-world example of a solid dissolved in a solid?

Accepted Answer

Brass (Zn in Cu)

Question 15

A student wants to prepare 250 mL of a 0.20 M NaCl solution. How many moles of NaCl are required?

Accepted Answer

$$0.050\ \mathrm{mol}$$

Question 16

Which of the following best explains why NaCl dissolves in water?

Accepted Answer

Water molecules surround and stabilize the Na$$^+$$ and Cl$$^-$$ ions.

Question 17

If you dilute 100 mL of 1.0 M solution to 400 mL, what is the new concentration?

Accepted Answer

$$0.25\ \mathrm{M}$$

Question 18

Which of the following is a correct application of the dilution equation $$M_1V_1 = M_2V_2$$?

Accepted Answer

Calculating the final concentration after adding more solvent.

Question 19

Which of the following would increase the molarity of a solution?

Accepted Answer

Adding more solute while keeping the volume constant.

Mixing Molecular Substances and Solution Chemistry

스터디 가이드 - 연습 문제