Deck 1: Chemistry in Our Lives

Question 1

One example of a chemical used in toothpaste is

A)sulfur.
B)chlorine.
C)calcium carbonate.
D)sugar.
E)carbon dioxide.

Answer 1

calcium carbonate.

Question 2

12 is what percentage of 36?

A)3%
B)30%
C)12%
D)33%
E)330%

Answer 2

33%

Question 3

In this list, which substance can be classified as a chemical?

A)salt
B)heat
C)temperature
D)cold
E)sleep

Answer 3

salt

Question 4

Which of the following would NOT be part of a study plan to learn chemistry?

A)form a study group
B)work the sample problems
C)skip your professor's office hours
D)read the chapter before class
E)study a little every day

Question 5

Sodium fluorophosphate is a chemical used in toothpaste to

A)keep the paste from spoiling.
B)make the paste white.
C)remove plaque.
D)strengthen tooth enamel.
E)disinfect the toothbrush.

Question 6

For the equation : -10 - (-4)=

A)4
B)6
C)-14
D)14
E)-6

Question 7

In the number 12.345, the 4 is in the ________ place.

A)tens
B)ones
C)tenths
D)hundredths
E)thousandths

Question 8

There is more traffic between 8:00 and 9:00 AM because most people start work at 9:00 AM. This would be a(n)

A)observation.
B)hypothesis.
C)conclusion/theory.
D)experiment.

Question 9

In the number 12.345, the 1 is in the ________ place.

A)tens
B)ones
C)tenths
D)hundredths
E)thousandths

Question 10

The product of (-4)× (-5)is

A)-1
B).20
C)-20
D)0
E).1

Question 11

For the equation 6y -20 = -2 , y equals

A)-3
B)2
C)4
D)-2
E)3

Question 12

In order to enhance your learning in chemistry, you should NOT

A)form a study group.
B)wait until the night before the exam to study.
C)go to professor's office hours.
D)be an active learner.
E)study a little every day.

Question 13

You notice that there is more traffic between 8:00 and 9:00 AM. This would be a(n)

A)hypothesis.
B)experiment.
C)observation.
D)conclusion/theory.

Question 14

Which of the following is a chemical?

A)light
B)sound
C)sugar
D)noise
E)heat

Question 15

Titanium dioxide is a chemical used in toothpaste to

A)disinfect the toothbrush.
B)strengthen tooth enamel.
C)make the toothpaste white.
D)remove plaque.
E)keep the paste from spoiling.

Question 16

Water, H₂O, is an example of a(n)

A)chemical.
B)electric charge.
C)element.
D)type of energy.
E)wave.

Question 17

In the number 12.345, the 3 is in the ________ place.

A)tens
B)ones
C)tenths
D)hundredths
E)thousandths

Question 18

For the equation 4x + 2 = 10 , x equals

A)-2
B)8
C)3
D)2
E)12

Question 19

When a part of the body is injured, substances called ________ are released.

A)nitrogen oxides
B)chlorofluorocarbons
C)prostaglandins
D)aspirins
E)pain relievers

Question 20

Which of the following is NOT a chemical?

A)light
B)salt
C)sugar
D)water
E)carbon dioxide

Question 21

Written in scientific notation, 8300 is

A) 8.3 × 10-2.
B) 8.3 × 102.
C) 8.3 × 103.
D) 8.3 × 104.
E) 8.3 × 10-3.

Question 22

Written in scientific notation, 0.000 004 03 is

A) 0.403 × 10-5.
B) 4.03 × 10-6.
C) 4.03 × 106.
D) 4.03 × 10-7.
E) 4.03.

Question 23

Express using scientific notation: 5 207 000

Question 24

Express using scientific notation: 351 000 000 000

Question 25

An abrasive used in toothpaste is ________.

Question 26

Any material used in or produced by a chemical reaction is a(n)________.

Question 27

Express using scientific notation: 0.000 000 050

Question 28

40 students complete the first semester chemistry course. If 32 students take the second semester class, ____%
are taking this class.

Question 29

Express using scientific notation: 0.000 860

Question 30

On the graph, what is the temperature after 40 minutes?

A) 44 °C
B) 40 °C
C) 57 °C
D) 26 °C
E) 36 °C

Question 31

On the graph, how long does it take to cool to from 80 °C go 45 °C?

A) 42 min
B) 35 min
C) 75 min
D) 25 min
E) 60 min

Question 32

The chemical used to make cans and foil is ________.

Question 33

Written in scientific notation, 540 000 is

A) 5.4 × 10-5.
B) 5.4.
C) 54 × 108.
D) 0.54 × 106.
E) 5.4 × 105.

Question 34

The second step in the scientific method is to ________.

Question 35

A substance that always has the same composition and properties is called a(n)________.

Question 36

Written in scientific notation, 0.000 000 33 is

A) 3.3 × 108.
B) 3.3.
C) 3.3 × 107.
D) 3.3 × 10-8.
E) 3.3 × 10-7.

Question 37

In the number 45.678, the digit 6 is in the ________ place.

Question 38

16 is what percentage of 80?

A)20%
B)5%
C)200%
D)2%
E)50%

Question 39

The first step in the scientific method is to ________.

Question 40

The substances released when tissues are injured are ________.