$$5.0 \times 10^3$ = 5000$$ grams

$$1 \ \text{kg} = 1000 \ \text{g}$$

Question 1

Which of the following best describes a scientific law?

Accepted Answer

A concise statement that summarizes the results of many experiments and observations.

Question 2

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

Accepted Answer

Dissolving sugar in water.

Question 3

Which of the following is a chemical property?

Accepted Answer

Reactivity with acid

Question 4

Which of the following equations correctly converts 5.0 kg to grams?

Accepted Answer

$$5.0 	imes 10^3$ = 5000$$ grams

Question 5

Which of the following best describes an endothermic reaction?

Accepted Answer

A reaction that absorbs heat from the surroundings.

Question 6

A student records the mass of a sample as $$2.50 g. $$How many significant figures are in this measurement?

Accepted Answer

3

Question 7

Which of the following is a correct example of a scientific theory?

Accepted Answer

Dalton's atomic theory

Question 8

Which of the following is a correct scientific notation for 0.00056?

Accepted Answer

$$5.6 	imes 10$$^{-4}$$

Question 9

Which of the following is a chemical change?

Accepted Answer

Digesting food

Question 10

A reaction absorbs 150 J of energy from the surroundings. Which term best describes this process?

Accepted Answer

Endothermic

Question 11

Which of the following is NOT a physical property?

Accepted Answer

Flammability

Question 12

Which of the following statements about the law of conservation of energy is correct?

Accepted Answer

Energy cannot be created or destroyed, only transformed.

Question 13

Convert $$2.75 	imes 10^3$ mg to grams.

Accepted Answer

$$2.75$$ grams

Question 14

Which of the following best describes the difference between a law and a theory?

Accepted Answer

A law is a summary of observed behavior, while a theory explains the reasons for that behavior.

Question 15

Which of the following is an example of an exothermic reaction?

Accepted Answer

Combustion of gasoline in a car engine

Question 16

How many significant figures are in the measurement 0.00450 m?

Accepted Answer

3

Question 17

Which of the following is a correct metric prefix conversion?

Accepted Answer

$$1 \ 	ext{kg} = 1000 \ 	ext{g}$$

Question 18

A student multiplies $$2.50 (3 $$sig figs) by $$1.2 (2 $$sig figs). What is the correct number of significant figures in the answer?

Accepted Answer

2

Question 19

Which of the following is a correct example of a physical change?

Accepted Answer

Water boiling to form steam

Question 20

Which of the following best describes the process of melting ice?

Accepted Answer

A physical change because the state of matter changes but the substance remains the same.

Chapter 1 Chemistry Exam Study Guide: The Chemical World & Measurement

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