$$\text{Mass of reactants} = \text{Mass of products}$$

Question 1

Which of the following is an example of a physical property of a substance?

Accepted Answer

Density

Question 2

A student measures the boiling point of water. Which type of property is being measured?

Accepted Answer

Physical property

Question 3

Which statement best describes a chemical property?

Accepted Answer

It is observed when a substance undergoes a chemical change.

Question 4

Which of the following is NOT a pure substance?

Accepted Answer

Air

Question 5

Which of the following mixtures is homogeneous?

Accepted Answer

Salt dissolved in water

Question 6

According to the law of conservation of mass, which equation correctly represents a chemical reaction?

Accepted Answer

$$	ext{Mass of reactants} = 	ext{Mass of products}$$

Question 7

Which of the following best illustrates the law of conservation of mass in a real-world scenario?

Accepted Answer

Mixing vinegar and baking soda and collecting all products, including gases, to compare total mass before and after reaction

Question 8

Which of the following is a chemical change?

Accepted Answer

Rusting of iron

Question 9

A compound is defined as:

Accepted Answer

A pure substance composed of two or more elements chemically combined in fixed proportions

Question 10

Which of the following statements about elements is correct?

Accepted Answer

Elements are pure substances consisting of only one type of atom.

Question 11

A student mixes sand and salt together. What type of matter is formed?

Accepted Answer

Heterogeneous mixture

Question 12

Which process is required to separate a compound into its constituent elements?

Accepted Answer

Chemical reaction

Question 13

Which of the following is a chemical property?

Accepted Answer

Ability to react with acid

Question 14

Which statement is true regarding mixtures?

Accepted Answer

Mixtures can be separated by physical means.

Question 15

A sample of water ($$H_2O) is $$classified as:

Accepted Answer

Compound

Question 16

Which of the following best describes the difference between a physical and a chemical property?

Accepted Answer

Chemical properties involve a change in the substance's composition.

Question 17

If 10 g of hydrogen reacts with 80 g of oxygen to form water, what is the mass of water produced according to the law of conservation of mass?

Accepted Answer

90 g

Question 18

Which of the following is NOT a chemical change?

Accepted Answer

Freezing water

Question 19

Which statement about the law of conservation of mass is correct?

Accepted Answer

The total mass of reactants equals the total mass of products in a closed system.

Question 20

Which of the following is a heterogeneous mixture?

Accepted Answer

Salad

Fundamental Concepts in General Chemistry

Study Guide - Practice Questions