General, Organic & Biological Chemistry, 5e (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
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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) 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.
7) When a part of the body is injured, substances called ________ are released.
A) aspirins
B) pain relievers
C) nitrogen oxides
D) chlorofluorocarbons
E) prostaglandins
8) Which of the following is a chemical?
A) sugar
B) heat
C) light
D) noise
E) a wave
9) 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
10) 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
11) 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
12) 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.
13) Which of the following would not be part of a study plan to learn chemistry?
A) study a little every day
B) skip your instructor‘s office hours
C) form a study group
D) read the chapter before class
E) work the sample problems
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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.
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) 16 is what percent of 80?
A) 200%
B) 20%
C) 2%
D) 5%
E) 50%
22) Written in scientific notation, 540 000 is
A) 0.54 × 106.
B) 54 × 108.
C) 5.4 × 10–5.
D) 5.4 × 105.
E) 5.4.
23) Written in scientific notation, 8300 is
A) 8.3 × 102.
B) 8.3 × 103.
C) 8.3 × 104.
D) 8.3 × 10-3.
E) 8.3 × 10-2.
24) Written in scientific notation, 0.000 000 33 is
A) 3.3 × 107.
B) 3.3 × 10-7.
C) 3.3 × 10–8.
D) 3.3 × 108.
E) 3.3.
25) Written in scientific notation, 0.000 004 03 is
A) 4.03 × 10-7.
B) 4.03 × 10-6.
C) 4.03 × 106.
D) 0.403 × 10-5.
E) 4.03.
1.2 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) Doing experiments to test your hypothesis is part of the scientific method.
6) Working with a group of students can help you learn chemistry.
7) Keeping a problem notebook will help you do well in your chemistry class.
8) It is a good idea to wait until the night before an exam to start to study.
9) In the number 123.45, the digit 5 is in the hundreds place.
10) When -7 is added to –5 the answer is 12.
11) If a negative number is divided by another negative number, the answer will be a positive number.
12) 3.5 × 103 is equal to 3500.
13) 2.25 × 10–4 is equal to 22500.
1.3 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) The second step in the scientific method is to ________.
9) In the number 45.678, the digit 6 is in the ________ place.
Express each of the following numbers using scientific notation.
10) 351 000 000 000
11) 0.000 860
12) 5 207 000
13) 0.000 000 050