Question 1

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

Accepted Answer

A scientific law is a summary of observed behavior, while a scientific theory provides an explanation for that behavior.

Question 2

A student measures the diameter of a quarter as shown in the image above. The ruler has markings every 1 mm. What is the correct way to report the measurement, and why?

Accepted Answer

24.6 mm, because the last digit should be estimated.

Question 3

Which of the following numbers has three significant figures?

Accepted Answer

0.00320

Question 4

Express 0.0000452 in scientific notation.

Accepted Answer

$$4.52 	imes 10$$^{-5}$$

Question 5

Which SI prefix multiplier would you use to express 0.000001 seconds?

Accepted Answer

micro-

Question 6

A sample of metal has a mass of 50 g and a volume of 10 cm$$^3. $$What is its density?

Accepted Answer

$$5 \ \mathrm{g/cm^3$}$$

Question 7

Which of the following is an example of a heterogeneous mixture?

Accepted Answer

Oil and vinegar salad dressing

Question 8

Which property is a chemical property?

Accepted Answer

Flammability

Question 9

Which of the following statements about the states of matter is correct?

Accepted Answer

Gases have an indefinite shape and volume.

Question 10

According to Dalton’s Atomic Theory, which statement is correct?

Accepted Answer

Atoms combine in simple, whole-number ratios to form compounds.

Question 11

Which subatomic particle has a mass of approximately $$1.0073$$ amu and a charge of $$1+$$?

Accepted Answer

Proton

Question 12

Which group on the periodic table contains the noble gases?

Accepted Answer

Group 8A

Question 13

What happens to the density of a substance if its mass remains the same but its volume increases?

Accepted Answer

The density decreases.

Question 14

Which of the following is a pure substance?

Accepted Answer

Oxygen gas

Question 15

Which of the following best describes an anion?

Accepted Answer

An atom that has gained electrons and is negatively charged.

Question 16

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

Accepted Answer

Water boiling

Question 17

Which of the following statements about metals is correct?

Accepted Answer

Metals are malleable and ductile.

Question 18

Which of the following is the correct SI base unit for temperature?

Accepted Answer

Kelvin

Question 19

Which of the following best describes a compound?

Accepted Answer

A substance composed of two or more elements chemically combined in a fixed ratio.

Question 20

A reaction in a hand warmer releases heat to your hands. This is an example of:

Accepted Answer

An exothermic reaction

Introductory Chemistry Exam 1 Study Guide

Guida di studio - Domande di pratica

Study guide - Flashcard