Question 1

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

Accepted Answer

A) Law 
B) Hypothesis 
C) Theory 
D) Phenomena 
E) Prediction 
A) Law 
B) Hypothesis 
C) Theory 
D) Phenomena 
E) Prediction

Question 2

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 3

Explain the rule for significant figures for addition and subtraction.

Accepted Answer

The answer cannot have more di

Question 4

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

Question 5

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

Accepted Answer

A) True 
 B)False

Question 6

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

Question 7

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

Question 8

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

Accepted Answer

A) Law 
B) Hypothesis 
C) Theory 
D) Phenomena 
E) Prediction 
A) Law 
B) Hypothesis 
C) Theory 
D) Phenomena 
E) Prediction

Question 9

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 10

Melting ice is a __________ change.

Accepted Answer

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

Question 11

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 12

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. 
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.

Question 13

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

Question 14

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

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

Question 16

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

Question 17

Zero kelvin 0 K < 0°F < 0°C.

Accepted Answer

A) True 
 B)False

Question 18

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/h 
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/h

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

Question 20

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. 
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.

Exam 1: Chemistry: the Central Science

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

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

Explain the rule for significant figures for addition and subtraction.

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

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

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

Which of the following is a chemical change?

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

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.

Melting ice is a __________ change.

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

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

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?

How many micrograms are in 65.3 kg?

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

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)

Zero kelvin 0 K < 0°F < 0°C.

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)

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

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?

Atoms Molecules and Ions

Stoichiometry Ratios of Combination

Reactions in Aqueous Solutions

Thermochemistry

Quantum Theory and the Electronic Structure of Atoms

Electron Configuration and the Periodic Table

Chemical Bonding I Basic Concepts

Chemical Bonding Ii Molecular Geometry and Bonding Theories

Gases

Intermolecular Forces and the Physical Properties of Liquids and Solids

Modern Materials

Physical Properties of Solutions

Chemical Kinetics

Chemical Equilibrium

Acids and Bases

Acid-Base Equilibria and Solubility Equilibria

Entropy Free Energy and Equilibrium

Electrochemistry

Nuclear Chemistry

Environmental Chemistry

Coordination Chemistry

Metallurgy and the Chemistry of Metals

Nonmetallic Elements and Their Compounds

Organic Chemistry

Filters

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)

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?