Question 1

Which of the following best describes a compound?

Accepted Answer

A pure substance made of two or more elements chemically joined together.

Question 2

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

Accepted Answer

Melting of ice to form liquid water.

Question 3

Which statement about mixtures is correct?

Accepted Answer

Mixtures can be separated into their components by physical methods.

Question 4

A sample contains only copper atoms. Which classification best fits this sample?

Accepted Answer

Element

Question 5

Which of the following chemical equations is balanced according to the Law of Conservation of Mass?

Accepted Answer

$$2H_2 + O_2$ \rightarrow 2H_2O$$

Question 6

Which of the following is NOT a pure substance?

Accepted Answer

Air

Question 7

Which of the following best describes a chemical change?

Accepted Answer

A process where atoms are rearranged to form new substances.

Question 8

Which of the following is a heterogeneous mixture?

Accepted Answer

Sand and iron filings

Question 9

Which of the following statements about elements and compounds is true?

Accepted Answer

Compounds have properties different from the elements that compose them.

Question 10

A student mixes copper filings and sulfur powder. Which of the following best describes the result?

Accepted Answer

A heterogeneous mixture is formed.

Question 11

Which of the following is a correct chemical formula for a compound containing two hydrogen atoms and one oxygen atom?

Accepted Answer

$$H_2O$$

Question 12

Which of the following best explains why the mass of reactants equals the mass of products in a chemical reaction?

Accepted Answer

Matter is not created or destroyed, only rearranged.

Question 13

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

Accepted Answer

Salt dissolved in water

Question 14

Which of the following is a micronutrient essential for human health?

Accepted Answer

Iron ($$Fe)$$

Question 15

Which of the following best describes the difference between a period and a group on the periodic table?

Accepted Answer

A period is a horizontal row; a group is a vertical column.

Question 16

Which of the following is a chemical property?

Accepted Answer

Reactivity with acid

Question 17

Which of the following best describes the process of balancing a chemical equation?

Accepted Answer

Adding coefficients in front of chemical formulas to ensure the same number of each atom on both sides.

Question 18

Which of the following is an example of a chemical reaction relevant to everyday life?

Accepted Answer

Cooking an egg

Question 19

Which of the following best describes the smallest unit of matter that retains its unique characteristics?

Accepted Answer

Atom

Question 20

Which of the following is a macronutrient required in amounts greater than 100 mg/day for human health?

Accepted Answer

Potassium ($$K)$$

Chemistry Basics: Matter and Measurement (Chapter 1 Study Guide)

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