AP Chemistry Chapter 1 Quiz (Part 2)
This quiz covers the second half of Chapter 1:� Chemical Foundations in your textbook. � This would be sections 1.5-1.9.
Questions and Answers
- 1.
How many significant figures is in the following number? 0.0105 g of caffeine
- A.
5
- B.
4
- C.
3
- D.
2
Correct Answer
C. 3Explanation
The first two zeroes would be "leading zeros", which means they are there simply to tell where the decimal point is. "Leading zeroes" do not count as significant figures. The non-zero digits (1 and 5 in this case) always count, and so does the "captive zero" in between them. Thus, making this problem have 3 sig figs.Rate this question:
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- 2.
How many significant figures are in the following number? 0.050080 g in a chemical analysis
- A.
6
- B.
5
- C.
4
- D.
2
Correct Answer
B. 5Explanation
The two "leading zeroes" do not count as significant figures. And the final zero is considered a "trailing zero", thus it would count since there is a decimal point in this number. The non-zero digits (5 and 8 in this case) would count, and so would the "captive zeroes" in between. Captive zeroes always count as sig figs. This would make 5 sig figs in this number.Rate this question:
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- 3.
What would be the correct answer (with significant figures) for the following problem?21-13.8 = ?
- A.
7.2
- B.
7
- C.
7.0
- D.
7.00
Correct Answer(s)
A. 7.2
B. 7Explanation
Since the limiting term has no decimal places, the answer will mirror that fact. This makes your answer have NO decimal places, leaving it to be displayed simply as 7.Rate this question:
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- 4.
Please round the following number to two significant figures. 4.348
- A.
4.4
- B.
4.3
- C.
4.5
- D.
4.35
Correct Answer
B. 4.3Explanation
First, look at the number directly to the right of the 3. Since it is less than 5, it gets rounded down to 4.3. DO NOT round from the end of the number.Rate this question:
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- 5.
When is it proper to round significant figures during a series of calculations?
- A.
It doesn't matter
- B.
The beginning
- C.
The middle
- D.
The end
Correct Answer
D. The endExplanation
Rules for Rounding #1: In a series of calculations, carry the extra digits through to the final result, then round.Rate this question:
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- 6.
A pencil is 5.08 in long. What is its length in centimeters?
- A.
17.8cm
- B.
12.9cm
- C.
2.54cm
- D.
5.08cm
Correct Answer
B. 12.9cmExplanation
5.08in x 2.54cm/1in = 12.9032cm
This rounds to 12.9cm since the limiting term has 3 significant figures.Rate this question:
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- 7.
Converting results from one system of units to another is commonly called what?
- A.
Significant figures
- B.
Calculations
- C.
Chemistry
- D.
Dimensional analysis
Correct Answer
D. Dimensional analysisExplanation
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- 8.
212 degrees Fahrenheit is equal to what temperature in Celsius?
- A.
37
- B.
100
- C.
98.6
- D.
180
Correct Answer
B. 100Explanation
(F - 32)(5/9) = C
(212-32)(5/9) = 100Rate this question:
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- 9.
100 degrees Celsius is equal to what temperature on the Kelvin scale?
- A.
313.15
- B.
373.15
- C.
273.15
- D.
213.15
Correct Answer
B. 373.15Explanation
K= C + 273.15
100 + 273.15 = 373.15 KRate this question:
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- 10.
A property of matter that is often used by chemists as an "identification tag" for a substance is called what?
- A.
Mass
- B.
Force
- C.
Weight
- D.
Density
Correct Answer
D. DensityExplanation
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- 11.
Anything that occupies space is called what?
- A.
Atoms
- B.
Matter
- C.
Density
- D.
Mass
Correct Answer
B. MatterExplanation
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- 12.
Which of the following is not a state of matter?
- A.
Solid
- B.
Brumley
- C.
Liquid
- D.
Gas
Correct Answer
B. Brumley -
- 13.
Which of the following mixtures has distinguishable parts?
- A.
Heterogeneous
- B.
Homogeneous
Correct Answer
A. HeterogeneousExplanation
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- 14.
What method of filtration employs a system with two phases of matter: a mobile phase and a stationary phase?
- A.
Distillation
- B.
Filtration
- C.
Chromatography
- D.
Change
Correct Answer
C. ChromatographyExplanation
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- 15.
Which of the following substances cannot be decomposed into simpler substances by chemical or physical means?
- A.
Solutions
- B.
Pure substances
- C.
Compounds
- D.
Elements
Correct Answer
D. ElementsExplanation
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