Question 1

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

Accepted Answer

Density

Question 2

A chemical property of matter is best described as:

Accepted Answer

A property that can be evaluated only by changing the chemical identity of the substance

Question 3

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

Accepted Answer

Salt dissolved in water

Question 4

According to the Law of Conservation of Mass, which equation correctly represents a chemical reaction?

Accepted Answer

$$m_{reactants} = m_{products}$$

Question 5

Which of the following is classified as a pure substance?

Accepted Answer

Copper metal

Question 6

Which statement best describes a compound?

Accepted Answer

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

Question 7

Which of the following changes is a chemical change?

Accepted Answer

Rusting of iron

Question 8

A student mixes sugar and sand together. This mixture is best classified as:

Accepted Answer

A heterogeneous mixture

Question 9

Which of the following best illustrates the Law of Conservation of Mass in a real-world scenario?

Accepted Answer

When baking soda reacts with vinegar, the total mass of the system remains unchanged if the system is closed

Question 10

Which of the following is NOT a physical property?

Accepted Answer

Ability to combust

Question 11

Which of the following statements is true about mixtures?

Accepted Answer

Mixtures can be separated into their components by physical means

Question 12

Which classification does oxygen gas (O$$_2) $$fall under?

Accepted Answer

Element

Question 13

A sample of seawater is best described as:

Accepted Answer

A homogeneous mixture

Question 14

Which of the following is a chemical property?

Accepted Answer

Reactivity with oxygen

Question 15

If 10 g of hydrogen reacts with 80 g of oxygen to form water, what is the mass of water formed according to the Law of Conservation of Mass?

Accepted Answer

90 g

Question 16

Which of the following is NOT a type of matter classification shown in the diagram?

Accepted Answer

Solution

Question 17

Which process involves a chemical change?

Accepted Answer

Burning wood

Question 18

Which of the following best describes a heterogeneous mixture?

Accepted Answer

A mixture with visibly different parts or phases

Question 19

Which of the following is a correct statement about compounds?

Accepted Answer

Compounds are made of two or more elements chemically combined in fixed ratios

Question 20

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

Accepted Answer

Dissolving sugar in tea

Some Basic Concepts of Chemistry: Properties, Classification of Matter, and Laws of Chemical Combination

Study Guide - Practice Questions