Unit 1 Exam Review

Question 1

The variable that is observed during an experiment is called the _________:

Answer 1

dependent

Question 2

What area of chemistry studies chemicals that generally do not contain carbon?:

Answer 2

inorganic

Question 3

Which of the following would a chemist be most likely to study?

A) a leaf floating on water
B) a leaf changing colour in autumn

Answer 3

B) a leaf changing colour in autumn

Question 4

Which step in the scientific method requires you to use your senses to obtain information?:

Answer 4

observation

Question 5

Which of these steps should always be followed for effective problem solving?

A) Guess and check
B) Trial and error
C) Develop and implement a plan
D) All of the above

Answer 5

C) Develop and implement a plan

Question 6

Which of the following best describes an example of pure chemistry?

A) Developing a cure for osteoporosis
B) Studying chemicals containing carbon
C) Developing a cheaper way to process oil
D) None of the above

Answer 6

B) Studying chemicals containing carbon

Question 7

T/F: Theories summarize the results of many observations and experiments

Answer 7

False

Question 8

An example of chemical technology is

A) The development of nylon as a replacement for silk
B) The use of aspirin to prevent heart attacks
C) The development of more fuel efficient vehicles
D) All of the above

Answer 8

D) All of the above

Question 9

What is another name for homogeneous mixtures?:

Answer 9

Solution

Question 10

A substance that forms a vapour is generally in what physical state at room temperature?:

Answer 10

Solid or liquid

Question 11

In the chemical reaction in which sucrose is heated and decomposes to form carbon dioxide and water, what is/are the reactant(s)?:

Answer 11

sucrose

Question 12

In the previous reaction when the sucrose decomposes, what happens to the mass during the reaction?:

Answer 12

Reactants and products have the same mass

Question 13

Which state of matter has a definite volume and takes the shape of its container?:

Answer 13

Liquid

Question 14

The first figure in a properly written chemical symbol is always:

Answer 14

Capitalized

Question 15

What is true about compounds?:

Answer 15

They are substances

Question 16

Which of the following is a homogenous mixture?

A) Beef Stew
B) Water
C) Salt
D) Salt Water

Answer 16

D) Salt water

Question 17

Which of the following CANNOT be classified as a substance?

A) Calcium
B) Table Salt
C) Sugar
D) Air

Answer 17

D) Air

Question 18

Which of the following is a chemical property?

A) Freezing point
B) Boiling point
C) The ability to react with oxygen
D) The ability to change state

Answer 18

C) The ability to react with oxygen

Question 19

When paper turns yellow-brown upon exposure to sunlight, what type of change is likely taking place?:

Answer 19

A chemical change

Question 20

Which of the following is NOT an example of matter?

A) heat
B) air
C) Table
D) book

Answer 20

A) heat

Question 21

A physical change occurs when a piece of wood

A) burns
B) rots
C) is cut
D) decomposes

Answer 21

C) is cut

Question 22

How are elements and compounds represented?:

Answer 22

Symbols and formulas

Question 23

To be certain a chemical change has occurred, one must witness a change in

A) Composition
B) Size
C) Shape
D) All of the above

Answer 23

A) Composition

Question 24

An example of an extensive property of matter is?

A) Hardness
B) Odor
C) Volume
D) Texture

Answer 24

C) Volume

Question 25

Which of the following indicates that a chemical change has happened during cooking?

A) The food changes colour
B) A new odour is produced
C) Bubbles form in boiling water
D) All of the above
E) Both A and B are correct

Answer 25

E) Both A and B are correct

** (A: the food changes colour
B: A new odour is produced) **