Q: A student needs to convert 25.0 inches to centimeters. Given that $$1 \text{ inch} = 2.54 \text{ cm}$$, what is the correct answer using dimensional analysis?

$$25.0 \text{ inches} \times \frac{2.54 \text{ cm}}{1 \text{ inch}} = 63.5 \text{ cm}$$

Q: A solution is prepared by dissolving 10.0 g of NaCl in enough water to make 250 mL of solution. What is the concentration in $$\text{g}/\text{L}$$?

$$10.0 \text{ g} \div 0.250 \text{ L} = 40.0 \text{ g}/\text{L}$$

Q: A compound contains 40% carbon, 6.7% hydrogen, and 53.3% oxygen by mass. What is the empirical formula?

$$\text{C}_1\text{H}_2\text{O}_1$$

Q: A student mixes 50.0 mL of 0.20 M NaCl with 150.0 mL of water. What is the final concentration of NaCl?

$$0.20 \text{ M} \times \frac{50.0 \text{ mL}}{200.0 \text{ mL}} = 0.05 \text{ M}$$

Q: In a calorimetry experiment, 100.0 g of water absorbs 418 J of heat. What is the temperature change? ($$c = 4.18 \text{ J/g}^\circ\text{C})$$

$$\Delta T = \frac{418 \text{ J}}{100.0 \text{ g} \times 4.18 \text{ J/g}^\circ\text{C}} = 1.0^\circ\text{C}$$

Q: Which of the following is the correct balanced equation for the reaction of acetic acid with sodium hydroxide?

$$\text{CH}_3\text{COOH} + \text{NaOH} \rightarrow \text{CH}_3\text{COONa} + \text{H}_2\text{O}$$

Q: A solution is made by dissolving 0.50 mol of glucose in 1.0 kg of water. If $$K_f$$ for water is $$1.86^\circ\text{C}/\text{molal}$$, what is the freezing point depression?

$$\Delta T_f = 1.86^\circ\text{C}/\text{molal} \times 0.50 \text{ molal} = 0.93^\circ\text{C}$$

Question 1

Which of the following best describes dimensional analysis and its importance in chemistry?

Accepted Answer

It is a technique for converting units and ensuring calculations are consistent in terms of measurement.

Question 2

A student needs to convert 25.0 inches to centimeters. Given that $$1 	ext{ inch} = 2.54 	ext{ cm}$$, what is the correct answer using dimensional analysis?

Accepted Answer

$$25.0 	ext{ inches} 	imes \frac{2.54 	ext{ cm}}{1 	ext{ inch}} = 63.5 	ext{ cm}$$

Question 3

Which statement about the density of elements and solutions is correct?

Accepted Answer

Density is defined as the mass of a substance divided by its volume: $$d = \frac{m}{V}.$$

Question 4

A solution is prepared by dissolving 10.0 g of NaCl in enough water to make 250 mL of solution. What is the concentration in $$	ext{g}/	ext{L}$$?

Accepted Answer

$$10.0 	ext{ g} \div 0.250 	ext{ L} = 40.0 	ext{ g}/	ext{L}$$

Question 5

Which of the following is a chemical property?

Accepted Answer

Reactivity with acid

Question 6

A compound contains 40% carbon, 6.7% hydrogen, and 53.3% oxygen by mass. What is the empirical formula?

Accepted Answer

$$	ext{C}_1	ext{H}_2	ext{O}_1$$

Question 7

Which equation correctly represents the dilution of a solution?

Accepted Answer

$$M_1V_1 = M_2V_2$$

Question 8

A student mixes 50.0 mL of 0.20 M NaCl with 150.0 mL of water. What is the final concentration of NaCl?

Accepted Answer

$$0.20 	ext{ M} 	imes \frac{50.0 	ext{ mL}}{200.0 	ext{ mL}} = 0.05 	ext{ M}$$

Question 9

Which of the following best describes a redox reaction?

Accepted Answer

A reaction in which electrons are transferred between species.

Question 10

In a calorimetry experiment, 100.0 g of water absorbs 418 J of heat. What is the temperature change? ($$c = 4.18 	ext{ J/g}^\circ	ext{C})$$

Accepted Answer

$$\Delta T = \frac{418 	ext{ J}}{100.0 	ext{ g} 	imes 4.18 	ext{ J/g}^\circ	ext{C}} = 1.0^\circ	ext{C}$$

Question 11

Which of the following is the correct balanced equation for the reaction of acetic acid with sodium hydroxide?

Accepted Answer

$$	ext{CH}_3	ext{COOH} + 	ext{NaOH} ightarrow 	ext{CH}_3	ext{COONa} + 	ext{H}_2	ext{O}$$

Question 12

Which formula is used to calculate the freezing point depression in a solution?

Accepted Answer

$$\Delta T_f = K_f \cdot m$$

Question 13

A solution is made by dissolving 0.50 mol of glucose in 1.0 kg of water. If $$K_f$$ for water is $$1.86^\circ	ext{C}/	ext{molal}$$, what is the freezing point depression?

Accepted Answer

$$\Delta T_f = 1.86^\circ	ext{C}/	ext{molal} 	imes 0.50 	ext{ molal} = 0.93^\circ	ext{C}$$

Question 14

Which statement about VSEPR theory is correct?

Accepted Answer

VSEPR theory predicts the shape of molecules based on electron pair repulsion.

Question 15

Which of the following molecules has a linear geometry according to VSEPR theory?

Accepted Answer

$$	ext{CO}_2$$

Question 16

A student analyzes the chloride ion content in soy sauce using titration. Which indicator is commonly used for this analysis?

Accepted Answer

Silver nitrate with potassium chromate as the indicator.

Question 17

Which equation represents the ideal gas law?

Accepted Answer

$$PV = nRT$$

Question 18

A sample of gas occupies 2.0 L at 1.0 atm and 300 K. How many moles of gas are present? ($$R = 0.0821 	ext{ L atm/mol K})$$

Accepted Answer

$$n = \frac{PV}{RT} = \frac{1.0 	ext{ atm} 	imes 2.0 	ext{ L}}{0.0821 	ext{ L atm/mol K} 	imes 300 	ext{ K}} = 0.081 	ext{ mol}$$

CHE 140 Spring 2026 General Chemistry Syllabus Overview

Study Guide - Practice Questions

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