Question 1

Which of the following is NOT considered a chemical according to the definition provided in the study materials?

Accepted Answer

Happiness

Question 2

Which statement best describes a pure substance?

Accepted Answer

A material with a fixed composition that cannot be broken down by physical means

Question 3

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

Accepted Answer

Salt dissolved in water

Question 4

Which physical method would be most appropriate to separate a mixture of sand and salt?

Accepted Answer

Filtration

Question 5

Which of the following is the correct chemical formula for table sugar?

Accepted Answer

$$\mathrm{C$$_{12}$$H_{22}O$$_{11}}$

Question 6

Which of the following is a correct symbol for the element argon?

Accepted Answer

$$\mathrm{Ar}$$

Question 7

A student wants to separate the components of ink. Which method should they use?

Accepted Answer

Chromatography

Question 8

Which of the following is NOT a step in the scientific method?

Accepted Answer

Ignoring experimental results

Question 9

Which of the following is a compound?

Accepted Answer

Table salt ($$\mathrm{NaCl})$$

Question 10

Which of the following statements about elements is TRUE?

Accepted Answer

Elements are listed on the periodic table and consist of only one type of atom

Question 11

Which of the following is a heterogeneous mixture?

Accepted Answer

Pizza

Question 12

Which of the following is the correct symbol for the element cobalt?

Accepted Answer

$$\mathrm{Co}$$

Question 13

Which of the following is a chemical reaction?

Accepted Answer

Burning a candle

Question 14

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

Accepted Answer

Evaporation of water

Question 15

Which of the following is a correct statement about compounds?

Accepted Answer

Compounds have a fixed ratio of elements

Question 16

Which of the following is the correct symbol for potassium?

Accepted Answer

$$\mathrm{K}$$

Question 17

Which of the following is a correct example of a mixture?

Accepted Answer

Air

Question 18

Which of the following is a correct example of a pure substance?

Accepted Answer

Aluminum foil

Question 19

Which of the following is the correct symbol for the element gold?

Accepted Answer

$$\mathrm{Au}$$

Question 20

Which of the following is a correct example of a chemical property?

Accepted Answer

Ability to burn

CHEM 1123 Unit 1: Introduction to Chemistry, Matter, and Scientific Method

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