Question 1

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

Accepted Answer

Melting point

Question 2

A student measures the mass and volume of a liquid to determine its density. Which type of property is density?

Accepted Answer

Physical property

Question 3

Which of the following changes is a chemical change?

Accepted Answer

Rusting of iron

Question 4

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

Accepted Answer

$$\mathrm{Mass\;of\;reactants} = \mathrm{Mass\;of\;products}$$

Question 5

Which statement best describes a chemical property?

Accepted Answer

It involves a change in the chemical composition of the substance.

Question 6

A mixture of sand and salt is stirred into water. Which process would best separate the sand from the mixture?

Accepted Answer

Filtration

Question 7

Which of the following is NOT a chemical property?

Accepted Answer

Color

Question 8

A student combines hydrogen and oxygen gases to produce water. If 2 g of hydrogen reacts with 16 g of oxygen, what is the mass of water produced according to the law of conservation of mass?

Accepted Answer

18 g

Question 9

Which of the following best describes matter?

Accepted Answer

Anything that has mass and occupies space

Question 10

Which process is a physical change?

Accepted Answer

Boiling water

Question 11

A sample of copper is hammered into a thin sheet. Which property is being demonstrated?

Accepted Answer

Physical property

Question 12

Which of the following is an example of a chemical change occurring in everyday life?

Accepted Answer

Cooking an egg

Question 13

Which statement is true about the law of conservation of mass in a closed system?

Accepted Answer

Mass remains constant during a chemical reaction.

Question 14

Which of the following is a chemical property of sodium?

Accepted Answer

It reacts vigorously with water

Question 15

A student observes that a substance changes color when exposed to air. What type of property is being observed?

Accepted Answer

Chemical property

Question 16

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

Accepted Answer

A sealed container where vinegar and baking soda react, and the total mass remains unchanged

Question 17

Which equation represents the law of conservation of mass for a chemical reaction?

Accepted Answer

$$\sum \mathrm{mass\;of\;reactants} = \sum \mathrm{mass\;of\;products}$$

Question 18

Which of the following is an example of a physical property that can be measured without changing the chemical composition of a substance?

Accepted Answer

Boiling point

Question 19

A chemist mixes two colorless solutions and observes the formation of a precipitate. What type of change has occurred?

Accepted Answer

Chemical change

Question 20

Which of the following is NOT a correct statement about matter?

Accepted Answer

Matter is always visible to the naked eye

Basic Concepts in Chemistry: Properties of Matter and Laws of Chemical Combination

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