Question 1

A(n)____________ is a substance composed of atoms of two or more elements chemically united in fixed proportions.

Accepted Answer

The answer of A(n)____________ is a substance composed of atoms...

Question 2

One of the common intravenous fluids,called physiological saline,is a homogeneous mixture of NaCl in water.In this mixture,0.89% of the mass is contributed by the NaCl.What mass of NaCl is found in 450.mL of physiological saline? ((Density of physiological saline = 1.005 g/cm3)

Accepted Answer

A)  2.0 g
B)  4.0 g
C)  5.1 g
D)  508 g
E)  400 gF) A) and B)
G) C) and D)

Question 3

The speed needed to escape the pull of Earth's gravity is 11.3 km/s.What is this speed in mi/h? (1 mile = 1609 m)

Accepted Answer

A)  65,500 mi/h
B)  25,300 mi/h
C)  18,200 mi/h
D)  1,090 mi/h
E)  5.02 × 10-3 mi/hF) B) and C)
G) C) and E)

Question 4

The recommended daily allowance (RDA) of calcium is 1.2 g.Calcium carbonate contains 12.0% calcium by mass.How many grams of calcium carbonate are needed to provide the RDA of calcium?

Accepted Answer

A)  0.10 g
B)  0.14 g
C)  1.2 g
D)  10.g
E)  14 gF) B) and C)
G) D) and E)

Question 5

What is a substance that cannot be separated into simpler substances by chemical means?

Accepted Answer

The answer of What is a substance that cannot be...

Question 6

Zero kelvin 0 K < 0°F < 0°C.

Accepted Answer

A) True 
 B)False

Question 7

How many micrograms are in 65.3 kg?

Accepted Answer

A)  0.653 μg
B)  6.53 × 107 μg
C)  6.53 × 104 μg
D)  6.53 × 10-8 μg
E)  6.53 × 1010 μgF) A) and B)
G) B) and E)

Question 8

Explain the rule for significant figures for addition and subtraction.

Accepted Answer

The answer cannot have more di...

Question 9

Melting ice is a __________ change.

Accepted Answer

The answer of Melting ice is a __________ change....

Question 10

A particular temperature in degrees Celsius is larger than the temperature in kelvins.

Accepted Answer

A) True 
 B)False

Question 11

If the temperature is 38.0°F then what is the temperature in kelvins?

Accepted Answer

A)  3.33 K
B)  100.4 K
C)  276.5 K
D)  311.15 K
E)  235.15 KF) C) and E)
G) A) and E)

Question 12

Which of the following is a chemical change?

Accepted Answer

A)  Boiling water
B)  Melting wax
C)  Broiling a steak on a grill
D)  Condensing water vapor into rainfall
E)  Carving a piece of woodF) B) and E)
G) B) and D)

Question 13

If two numbers are added together,one which has 2 digits after the decimal point and the other which has 1 digit after the decimal point,explain how to round the answer.

Accepted Answer

The answer will have 1 digit after the d...

Question 14

Dry ice (carbon dioxide) changes from a solid to a gas at -78.5°C.What is this temperature in °F?

Accepted Answer

A)  -173°F
B)  -12.6°F
C)  -109°F
D)  -75.6°F
E)  None of them is within 2°F of the right answer.F) C) and E)
G) D) and E)

Question 15

Which is correct if 15,390,000 is rounded to two significant figures?

Accepted Answer

A)  15
B)  1.5 × 10-7
C)  1.5 × 108
D)  15,400,000
E)  15,000,000F) C) and E)
G) A) and B)

Question 16

When the value of something does not depend on the amount of the matter then what is this called?

Accepted Answer

A)  Empirical property
B)  Intensive property
C)  Inclusive property
D)  Extensive property
E)  Exclusive propertyF) C) and E)
G) A) and E)

Question 17

The density of magnesium is 1.7 g/cm3,and the density of iron is 7.9 g/cm3.Consider a block of iron with a mass of 819 g.What is the mass of a block of magnesium that has the same volume as the block of iron?

Accepted Answer

A)  1.8 x 102 g
B)  61 g
C)  2.8 x 103 g
D)  3.8 x 103 g
E)  None of the.F) A) and B)
G) A) and C)

Question 18

Which of the following is a tentative explanation for a set of observations?

Accepted Answer

A)  Law
B)  Hypothesis
C)  Theory
D)  Phenomena
E)  PredictionF) D) and E)
G) A) and C)

Question 19

How many inches are in 382.5 cm? (1 in = 2.54 cm)

Accepted Answer

A)  150.6 in
B)  6.641 × 10-3 in
C)  151 in
D)  971.6 in
E)  972 inF) A) and D)
G) A) and E)

Question 20

What is a unifying principle that explains a body of experimental observations?

Accepted Answer

A)  Law
B)  Hypothesis
C)  Theory
D)  Phenomena
E)  PredictionF) None of the above
G) A) and E)

Exam 1: Chemistry: the Central Science

Dry ice (carbon dioxide) changes from a solid to a gas at -78.5°C.What is this temperature in °F?

Correct AnswerverifiedShow Answer

The recommended daily allowance (RDA) of calcium is 1.2 g.Calcium carbonate contains 12.0% calcium by mass.How many grams of calcium carbonate are needed to provide the RDA of calcium?

Correct AnswerverifiedShow Answer

Which is correct if 15,390,000 is rounded to two significant figures?

Correct AnswerverifiedShow Answer

Which of the following is a tentative explanation for a set of observations?

Correct AnswerverifiedShow Answer

When the value of something does not depend on the amount of the matter then what is this called?

Correct AnswerverifiedShow Answer

How many micrograms are in 65.3 kg?

Correct AnswerverifiedShow Answer

What is a substance that cannot be separated into simpler substances by chemical means?

Correct AnswerverifiedShow Answer

The density of magnesium is 1.7 g/cm3,and the density of iron is 7.9 g/cm3.Consider a block of iron with a mass of 819 g.What is the mass of a block of magnesium that has the same volume as the block of iron?

Correct AnswerverifiedShow Answer

Zero kelvin 0 K < 0°F < 0°C.

Correct AnswerverifiedShow Answer

If the temperature is 38.0°F then what is the temperature in kelvins?

Correct AnswerverifiedShow Answer

If two numbers are added together,one which has 2 digits after the decimal point and the other which has 1 digit after the decimal point,explain how to round the answer.

Correct AnswerverifiedThe answer will have 1 digit after the d...View AnswerShow Answer

One of the common intravenous fluids,called physiological saline,is a homogeneous mixture of NaCl in water.In this mixture,0.89% of the mass is contributed by the NaCl.What mass of NaCl is found in 450.mL of physiological saline? ((Density of physiological saline = 1.005 g/cm3)

Correct AnswerverifiedShow Answer

Melting ice is a __________ change.

Correct AnswerverifiedShow Answer

How many inches are in 382.5 cm? (1 in = 2.54 cm)

Correct AnswerverifiedShow Answer

A particular temperature in degrees Celsius is larger than the temperature in kelvins.

Correct AnswerverifiedShow Answer

The speed needed to escape the pull of Earth's gravity is 11.3 km/s.What is this speed in mi/h? (1 mile = 1609 m)

Correct AnswerverifiedShow Answer

A(n)____________ is a substance composed of atoms of two or more elements chemically united in fixed proportions.

Correct AnswerverifiedShow Answer

What is a unifying principle that explains a body of experimental observations?

Correct AnswerverifiedShow Answer

Explain the rule for significant figures for addition and subtraction.

Correct AnswerverifiedThe answer cannot have more di...View AnswerShow Answer

Which of the following is a chemical change?

Correct AnswerverifiedShow Answer

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The density of magnesium is 1.7 g/cm³,and the density of iron is 7.9 g/cm³.Consider a block of iron with a mass of 819 g.What is the mass of a block of magnesium that has the same volume as the block of iron?

Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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The answer will have 1 digit after the d...
View Answer

One of the common intravenous fluids,called physiological saline,is a homogeneous mixture of NaCl in water.In this mixture,0.89% of the mass is contributed by the NaCl.What mass of NaCl is found in 450.mL of physiological saline? ((Density of physiological saline = 1.005 g/cm³)

Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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The answer cannot have more di...
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