Q: Convert $$654 \text{ kg} to $$grams using metric prefixes.

$$6.54 \times 10$$^{5}$$ \text{ g}$$

Q: A refrigerator uses $$700 \text{ kWh} of $$electrical energy per year. How many joules of energy does it use in three years? ($$1 \text{ kWh} = 3.60 \times 10$$^{6}$$ \text{ J})$$

$$7.56 \times 10$$^{9}$$ \text{ J}$$

Q: Which of the following is the correct formula for density?

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

Q: Which of the following is an example of dimensional analysis?

Converting inches to centimeters using $$1 \text{ in} = 2.54 \text{ cm}$$

Q: What is the kinetic energy of an electron ($$m = 9.11 \times 10$$^{-31}$$ \text{ kg}) $$moving at $$1.58 \times 10$$^{6}$$ \text{ m/s}$$?

$$1.14 \times 10$$^{-18}$$ \text{ J}$$

Q: Which of the following temperature conversions is correct?

$$^{\circ}\text{C} = \frac{5}{9}$$(^{\circ}$$\text{F} - 32)$$

Question 1

Which step of the scientific method involves making a prediction based on prior observations and data analysis?

Accepted Answer

Hypothesis

Question 2

A scientist observes that a metal reacts violently with water. Which type of property is being described?

Accepted Answer

Chemical property

Question 3

Which of the following is a homogeneous mixture?

Accepted Answer

Air

Question 4

Which process is an example of a reversible physical change?

Accepted Answer

Melting ice

Question 5

Which of the following statements best describes a compound?

Accepted Answer

A substance composed of two or more elements chemically bonded together

Question 6

What is the correct scientific notation for 0.000125?

Accepted Answer

$$1.25 	imes 10$$^{-4}$$

Question 7

A cube of silver has a density of $$10.5 	ext{ g/cm}^3$$ and measures $$0.36 	ext{ m} on $$each side. What is its mass in kilograms?

Accepted Answer

$$489.6 	ext{ kg}$$

Question 8

Which of the following is NOT a physical property?

Accepted Answer

Potassium metal is extremely reactive when placed in water

Question 9

Convert $$654 	ext{ kg} to $$grams using metric prefixes.

Accepted Answer

$$6.54 	imes 10$$^{5}$$ 	ext{ g}$$

Question 10

A refrigerator uses $$700 	ext{ kWh} of $$electrical energy per year. How many joules of energy does it use in three years? ($$1 	ext{ kWh} = 3.60 	imes 10$$^{6}$$ 	ext{ J})$$

Accepted Answer

$$7.56 	imes 10$$^{9}$$ 	ext{ J}$$

Question 11

Which of the following is the correct formula for density?

Accepted Answer

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

Question 12

A scientist measures the length of a pencil as $$8.70 	ext{ cm}. $$How many significant figures are in this measurement?

Accepted Answer

3

Question 13

Which of the following statements represents a hypothesis?

Accepted Answer

If I drink coffee early in the morning, I will be able to stay alert at night.

Question 14

Which of the following is an example of dimensional analysis?

Accepted Answer

Converting inches to centimeters using $$1 	ext{ in} = 2.54 	ext{ cm}$$

Question 15

A solution contains $$0.50 	ext{ g} of $$salt dissolved in $$100 	ext{ mL} of $$water. What is the concentration in $$	ext{g/mL}$$?

Accepted Answer

$$0.005 	ext{ g/mL}$$

Question 16

Which of the following is a chemical property of hydrogen gas?

Accepted Answer

It reacts explosively with oxygen gas.

Question 17

What is the kinetic energy of an electron ($$m = 9.11 	imes 10$$^{-31}$$ 	ext{ kg}) $$moving at $$1.58 	imes 10$$^{6}$$ 	ext{ m/s}$$?

Accepted Answer

$$1.14 	imes 10$$^{-18}$$ 	ext{ J}$$

Question 18

Which of the following temperature conversions is correct?

Accepted Answer

$$^{\circ}	ext{C} = \frac{5}{9}$$(^{\circ}$$	ext{F} - 32)$$

Question 19

A sample of copper with a density of $$8.96 	ext{ g/cm}^3$$ has a mass of $$21.7 	ext{ g}. $$What is its volume in $$	ext{cm}^3$$?

Accepted Answer

$$2.42 	ext{ cm}^3$$

Ch.1 – Introduction: Matter, Energy, and Measurement (General Chemistry Study Notes)

Study Guide - Practice Questions

Study Guide - Flashcards