Introduction to General, Organic & Biological Chemistry, 12e (Timberlake)
Chapter 1 Chemistry in Our Lives
1.1 Multiple-Choice Questions
1) Water, H2O, is an example of a(n) ________.
A) chemical
B) solid
C) wave
D) electric charge
E) element
2) In this list, which substance can be classified as a chemical?
A) salt
B) sleep
C) cold
D) heat
E) temperature
3) One example of a chemical used in toothpaste is ________.
A) chlorine
B) sulfur
C) carbon dioxide
D) calcium carbonate
E) sugar
4) Which of the following is not a chemical?
A) salt
B) water
C) light
D) carbon dioxide
E) sugar
5) Sodium fluorophosphate is a chemical used in toothpaste to ________.
A) make the paste white
B) disinfect the toothbrush
C) keep the paste from spoiling
D) remove plaque
E) strengthen tooth enamel
6) When a part of the body is injured, substances called ________ are released.
A) aspirins
B) pain relievers
C) nitrogen oxides
D) chlorofluorocarbons
E) prostaglandins
7) The production of smog from NO gas requires ________.
A) nitrogen
B) chlorine
C) water
D) oxygen
E) CFCs
8) Titanium dioxide is a chemical used in toothpaste to ________.
A) make the paste white
B) disinfect the toothbrush
C) keep the paste from spoiling
D) remove plaque
E) strengthen tooth enamel
9) Which of the following is a chemical?
A) sugar
B) heat
C) light
D) noise
E) a wave
10) You notice that there is more traffic between 8 and 9 in the morning. This would be a(n)
________.
A) observation
B) hypothesis
C) experiment
D) theory
E) all the above
4
11) There is more traffic between 8 and 9 in the morning because most people start work at 9.
This would be a(n) ________.
A) observation
B) hypothesis
C) experiment
D) theory
E) all the above
12) One way to enhance your learning in chemistry is to ________.
A) study a little every day
B) form a study group
C) go to office hours
D) be an active learner
E) all the above
13) In order to enhance your learning in chemistry, you should not ________.
A) study a little every day
B) form a study group
C) go to office hours
D) be an active learner
E) wait until the night before the exam to study
14) In the number 12.345, the 4 is in the ________ place.
A) tens
B) ones
C) tenths
D) hundredths
E) thousandths
15) In the number 12.345, the 1 is in the ________ place.
5
A) tens
B) ones
C) tenths
D) hundredths
E) thousandths
16) In the number 12.345, the 3 is in the ________ place.
A) tens
B) ones
C) tenths
D) hundredths
E) thousandths
17) The product of (-4) × (-5) is ________.
A) -20
B) +20
C) -1
D) +1
E) 0
18) For the equation 4x + 2 = 10, x equals ________.
A) 8
B) 12
C) 3
D) 2
E) -2
19) For the equation -10 – (-4) = ________.
A) 6
B) -6
C) 14
D) -14
E) 4
20) 12 is what percent of 36?
A) 3%
B) 30%
C) 33%
D) 330%
E) 12%
21) Write 540 000 in scientific notation.
A) 0.54 × 106
B) 54 × 108
C) 5.4 × 10-5
D) 5.4 × 105
E) 5.4
22) Write 0.000 000 33 in scientific notation.
A) 3.3 × 107
B) 3.3 × 10-7
C) 3.3 × 10-8
D) 3.3 × 108
E) 3.3
23) The measurement 0.000 004 3 m, expressed correctly using scientific notation, is ________.
A) 4.3 × m
B) 4.3 × m
C) 4.3 × m
D) 0.43 × m
E) 4.3 m
1.2 Short Answer Questions
1) A substance that consists of one type of matter and always has the same composition and
properties is called a ________.
2) Any material used in or produced by a chemical reaction is a ________.
3) An abrasive used in toothpaste is ________.
4) The substances released when tissues are injured are ________.
5) Substances which prevent spoilage are called ________.
6) The chemical used to make cans and foil is ________.
7) The first step in the scientific method is to________.
8) 351 000 000 000
9) 0.000 860
10) 5 207 000
11) 0.000 000 050
1.3 True/False Questions
1) Titanium dioxide in toothpaste is used as a detergent.
2) Calcium carbonate is used to sweeten toothpaste.
3) Paracelsus was a Greek philosopher.
4) The first step in the scientific method is to draw a conclusion.
5) Working with a group of students can help you learn chemistry.
6) It is a good idea to wait until the night before an exam to start to study.
7) In the number 123.45, the digit 5 is in the hundreds place.
8) If a negative number is divided by another negative number, the answer will be a positive
number.