Q: Which metric unit is used to measure volume, and how would you convert 250 mL to liters?

The metric unit for volume is the liter. $$250\ \text{mL} = 0.25\ \text{L}$$

Q: A metal sample has a mass of 50.0 g and a volume of 20.0 mL. What is its density?

$$\text{Density} = \frac{\text{mass}}{\text{volume}} = \frac{50.0\ \text{g}}{20.0\ \text{mL}} = 2.5\ \text{g/mL}$$

Q: A sample of water is heated from $$20^\circ \text{C} to$$ $$80^\circ \text{C}. If $$the mass of water is 100 g and the specific heat capacity is $$4.18\ \text{J/g}^\circ \text{C}$$, what is the energy absorbed?

$$q = m \times c \times \Delta T = 100 \times 4.18 \times (80 - 20) = 25,080\ \text{J}$$

Q: Convert $$25^\circ \text{C} to $$Kelvin.

$$K = ^\circ \text{C} + 273.15 = 25 + 273.15 = 298.15\ \text{K}$$

Q: A student needs to convert 5.0 km to meters. Which calculation is correct?

$$5.0\ \text{km} \times 1000\ \text{m/km} = 5000\ \text{m}$$

Question 1

Which of the following best describes the difference between a hypothesis and a theory in the scientific method?

Accepted Answer

A hypothesis is a testable statement that can be investigated, while a theory is a broad explanation that has been repeatedly confirmed by experiments.

Question 2

Which of the following is the correct scientific notation for the number 0.000456?

Accepted Answer

$$4.56 	imes 10$$^{-4}$$

Question 3

A student measures the mass of a sample as 12.345 g. Which of the following correctly expresses this measurement to three significant figures?

Accepted Answer

12.3 g

Question 4

Which metric unit is used to measure volume, and how would you convert 250 mL to liters?

Accepted Answer

The metric unit for volume is the liter. $$250\ 	ext{mL} = 0.25\ 	ext{L}$$

Question 5

A metal sample has a mass of 50.0 g and a volume of 20.0 mL. What is its density?

Accepted Answer

$$	ext{Density} = \frac{	ext{mass}}{	ext{volume}} = \frac{50.0\ 	ext{g}}{20.0\ 	ext{mL}} = 2.5\ 	ext{g/mL}$$

Question 6

Which of the following best describes the difference between an element and a compound?

Accepted Answer

An element is a pure substance consisting of only one type of atom, while a compound is a pure substance made of two or more different atoms chemically bonded.

Question 7

Which of the following is an example of a chemical change?

Accepted Answer

Burning wood

Question 8

Which of the following is a diatomic element?

Accepted Answer

Oxygen ($$	ext{O}_2)$$

Question 9

A sample of water is heated from $$20^\circ 	ext{C} to$$ $$80^\circ 	ext{C}. If $$the mass of water is 100 g and the specific heat capacity is $$4.18\ 	ext{J/g}^\circ 	ext{C}$$, what is the energy absorbed?

Accepted Answer

$$q = m 	imes c 	imes \Delta T = 100 	imes 4.18 	imes (80 - 20) = 25,080\ 	ext{J}$$

Question 10

Which of the following best describes the Law of Conservation of Energy?

Accepted Answer

Energy cannot be created or destroyed, only transformed from one form to another.

Question 11

Which of the following is a physical property?

Accepted Answer

Boiling point

Question 12

Convert $$25^\circ 	ext{C} to $$Kelvin.

Accepted Answer

$$K = ^\circ 	ext{C} + 273.15 = 25 + 273.15 = 298.15\ 	ext{K}$$

Question 13

Which of the following best describes a mixture?

Accepted Answer

A mixture is composed of two or more substances physically combined, each retaining its own properties.

Question 14

Which of the following statements about metals is correct?

Accepted Answer

Metals are generally shiny, malleable, and good conductors of electricity.

Question 15

A student needs to convert 5.0 km to meters. Which calculation is correct?

Accepted Answer

$$5.0\ 	ext{km} 	imes 1000\ 	ext{m/km} = 5000\ 	ext{m}$$

Question 16

Which of the following best describes the kinetic energy of particles in the three states of matter?

Accepted Answer

Solid particles have the lowest kinetic energy, liquid particles have moderate kinetic energy, and gas particles have the highest kinetic energy.

Question 17

Which of the following is the correct formula for calculating density?

Accepted Answer

$$	ext{Density} = \frac{	ext{mass}}{	ext{volume}}$$

Question 18

Which of the following is NOT a property of metalloids?

Accepted Answer

Metalloids are generally good conductors of electricity like metals.

Question 19

A compound has the formula $$	ext{C}_6	ext{H}_{12}	ext{O}_6. $$How many atoms are present in one molecule?

Accepted Answer

24 atoms

Introduction to Chemistry: Study Guide (Chapters 1–4, Timberlake & Timberlake 6th Edition)

Study Guide - Practice Questions

Study Guide - Flashcards