Question 1

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

Accepted Answer

A chemical change involves the formation of new substances with different properties, while a physical change does not alter the chemical identity.

Question 2

Which of the following is an example of an intensive property?

Accepted Answer

Density

Question 3

A student observes that ice melts at $$0^	ext{o}C. $$This observation is best classified as:

Accepted Answer

A physical property

Question 4

Which of the following substances is a compound?

Accepted Answer

Carbon dioxide ($$CO_2)$$

Question 5

Which of the following is a chemical property?

Accepted Answer

Flammability

Question 6

Which statement correctly distinguishes between a pure substance and a mixture?

Accepted Answer

A mixture has a variable composition, while a pure substance has a fixed composition.

Question 7

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

Accepted Answer

Salt water

Question 8

Which property is classified as extensive?

Accepted Answer

Volume

Question 9

Which of the following is NOT a chemical property?

Accepted Answer

Yellow-orange color

Question 10

Which of the following changes is a chemical change?

Accepted Answer

Cooking an egg

Question 11

Which domain of chemistry involves using symbols and equations to represent chemical phenomena?

Accepted Answer

Symbolic

Question 12

Which of the following is an element in its atomic form?

Accepted Answer

Gold ($$Au)$$

Question 13

Which of the following is a physical change?

Accepted Answer

Dissolving sugar in water

Question 14

Which property would NOT change if you cut a block of gold in half?

Accepted Answer

Density

Question 15

Which of the following is a correct inference based on the observation that iron rusts when exposed to oxygen and moisture?

Accepted Answer

Iron undergoes a chemical change when exposed to oxygen and moisture.

Question 16

Which of the following best describes the role of chemistry as the 'central science'?

Accepted Answer

Chemistry connects and overlaps with many fields such as biology, medicine, and engineering.

Question 17

Which of the following is a mixture?

Accepted Answer

Air

Question 18

Which of the following is a chemical change that occurs in everyday life?

Accepted Answer

Baking a cake

Question 19

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

Accepted Answer

Melting point

Question 20

Which of the following is a correct statement about elements and compounds?

Accepted Answer

Compounds are made up of two or more elements chemically combined in fixed proportions.

Introduction to Chemistry: Matter, Properties, and Classification

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