Question 1

A compound is found to contain 40.0% carbon, 6.7% hydrogen, and 53.3% oxygen by mass. What is the empirical formula of this compound?

Accepted Answer

$$\mathrm{CH}_2\mathrm{O}$$

Question 2

A sample of a hydrate of magnesium sulfate, $$\mathrm{$$MgSO_4$$} \cdot x\mathrm{H_2O}$$, has a mass of 13.52 g before heating and 6.60 g after heating. What is the value of $$x in $$the hydrate?

Accepted Answer

$$x = 5$$

Question 3

A compound has an empirical formula of $$\mathrm{CH_2O}$$ and a molar mass of 180 g/mol. What is its molecular formula?

Accepted Answer

$$\mathrm{C}_6\mathrm{H}_{12}\mathrm{O}_6$$

Question 4

What is the percent composition by mass of nitrogen in ammonium nitrate, $$\mathrm{NH_4NO_3}$$?

Accepted Answer

35.0%

Question 5

How many moles of sodium ions are present in 250 mL of 0.20 M $$\mathrm{Na_2SO_4}$$ solution?

Accepted Answer

0.20 mol

Question 6

Which of the following is a strong electrolyte when dissolved in water?

Accepted Answer

Sodium chloride ($$\mathrm{NaCl})$$

Question 7

A solution is prepared by dissolving 5.00 g of $$\mathrm{KCl} in $$enough water to make 250 mL of solution. What is the molarity of the solution? ($$M_{KCl} = 74.55 g/$$mol)

Accepted Answer

0.267 M

Question 8

A student dilutes 50.0 mL of 6.00 M HCl to a final volume of 300.0 mL. What is the final concentration?

Accepted Answer

1.00 M

Question 9

A solution has an absorbance of 0.400 at a certain wavelength. If the path length is 1.00 cm and the molar absorptivity is $$200 L/($$mol·cm), what is the concentration of the solution according to Beer's Law?

Accepted Answer

0.0200 M

Question 10

Which of the following compounds is most soluble in water at room temperature?

Accepted Answer

$$\mathrm{$$NaNO_3$$}$$

Question 11

What is the pH of a $$1.0 	imes 10$$^{-3}$$ M $$\mathrm{HCl}$$ solution?

Accepted Answer

3.0

Question 12

A 10.0 mL sample of 0.50 M $$\mathrm{NaOH} is $$diluted to 100.0 mL. What is the new concentration?

Accepted Answer

0.050 M

Question 13

Which of the following best describes the process of determining the empirical formula of a compound?

Accepted Answer

Finding the ratio of atoms in a molecule based on percent composition

Question 14

A solution is prepared by dissolving 10.0 g of glucose ($$\mathrm{C_6H_{12}O_6$}) in $$enough water to make 500 mL of solution. What is the molarity of the solution? ($$M_{C_6H_{12}O_6$} = 180$ g/mol)

Accepted Answer

0.111 M

Question 15

Which of the following is NOT a property of a strong acid?

Accepted Answer

Partially ionizes in water

Question 16

If 2.00 g of $$\mathrm{Na_2CO_3} is $$dissolved in 100.0 mL of water, what is the molarity of the solution? ($$M_{Na_2CO_3} = 106 g/$$mol)

Accepted Answer

0.189 M

Question 17

Which of the following statements about electrolytes is correct?

Accepted Answer

Strong acids and salts are strong electrolytes

Question 18

A solution is made by mixing 100 mL of 0.10 M $$\mathrm{NaCl}$$ with 100 mL of 0.20 M $$\mathrm{NaCl}. $$What is the final concentration of $$\mathrm{NaCl}$$?

Accepted Answer

0.15 M

Question 19

Which of the following best explains why $$\mathrm{AgCl} is $$considered insoluble in water?

Accepted Answer

Its lattice energy is much greater than its hydration energy

General Chemistry 1: Unit 2 Study Guide – Key Concepts and Problem-Solving Strategies

스터디 가이드 - 연습 문제

학습 가이드 - 플래시카드