Question 1

Which of the following is an example of a chemical change?

Accepted Answer

A) Copper building materials develop a green patina over time. 
B) Solid ice melts. 
C) Ethanol evaporates. 
D) Brewing tea. 
A) Copper building materials develop a green patina over time. 
B) Solid ice melts. 
C) Ethanol evaporates. 
D) Brewing tea.

Question 2

Define random error.

Accepted Answer

Random error has an

Question 3

Round off 00907506 to four significant figures.

Accepted Answer

A) 0091 
B) 9076 
C) 9100 
D) 9.075 × 105 
A) 0091 
B) 9076 
C) 9100 
D) 9.075 × 105

Question 4

What answer should be reported,with the correct number of significant figures,for the following calculation? 
3.000 × 105 + 614283

Accepted Answer

A) 914283 
B) 9.1428 × 105 
C) 914300 
D) 9.14283 × 105 
E) 914000 
A) 914283 
B) 9.1428 × 105 
C) 914300 
D) 9.14283 × 105 
E) 914000

Question 5

A piece of metal ore weighs 8.25 g.When a student places it into a graduated cylinder containing water,the liquid level rises from 21.25 mL to 26.47 mL.What is the density of the ore?

Accepted Answer

A) 0.312 g mL-1 
B) 0.633 g mL-1 
C) 1.58 g mL-1 
D) 3.21 g mL-1 
A) 0.312 g mL-1 
B) 0.633 g mL-1 
C) 1.58 g mL-1 
D) 3.21 g mL-1

Question 6

Which of the following represents a chemical property of hydrogen gas?

Accepted Answer

A) It is gaseous at room temperature. 
B) It is less dense than air. 
C) It reacts explosively with oxygen. 
D) It is colourless. 
E) It is tasteless. 
A) It is gaseous at room temperature. 
B) It is less dense than air. 
C) It reacts explosively with oxygen. 
D) It is colourless. 
E) It is tasteless.

Question 7

What answer should be reported,with the correct number of significant figures,for the following calculation? 
1.682 × 10-3 + 4.311 × 10-2

Accepted Answer

A) 4.44792 × 10-2 
B) 4.44792 × 10-3 
C) 4.48 × 10-2 
D) 4.479 × 10-3 
E) 4.479 × 10-2 
A) 4.44792 × 10-2 
B) 4.44792 × 10-3 
C) 4.48 × 10-2 
D) 4.479 × 10-3 
E) 4.479 × 10-2

Question 8

If the outside air temperature is 30 °F,what is the temperature in kelvin?

Accepted Answer

A) 303 K 
B) 307 K 
C) 274 K 
D) 272 K 
A) 303 K 
B) 307 K 
C) 274 K 
D) 272 K

Question 9

What symbol is used to represent the factor 10-1?

Accepted Answer

A) M 
B) m 
C) μ 
D) d 
A) M 
B) m 
C) μ 
D) d

Question 10

A mass of mercury occupies 0.750 L.What volume would an equal mass of ethanol occupy? The density of mercury is $13.546 \mathrm {~g} \mathrm {~mL} - 1$ and the density of ethanol is 0.789 g mL-1.

Accepted Answer

A) 0.0437 L 
B) 0.0777 L 
C) 12.9 L 
D) 22.9 L 
A) 0.0437 L 
B) 0.0777 L 
C) 12.9 L 
D) 22.9 L

Question 11

Without using a calculator,solve the following problem: $$\frac { \left[ \left( 1 \times 10 ^ { - 8 } \right) \times \left( 1 \times 10 ^ { 5 } \right) \right] ^ { 2 } } { \left( 1 \times 10 ^ { 6 } \right) }$$

Accepted Answer

A) 1 × 106 
B) 1 × 100 
C) 1 × 10-12 
D) 1 × 10-18 
A) 1 × 106 
B) 1 × 100 
C) 1 × 10-12 
D) 1 × 10-18

Question 12

What is the volume (in cm3)of a 43.6 g piece of metal with a density of 2.71 g cm-3?

Accepted Answer

A) 16.1 
B) 19.5 
C) .425 
D) 6.65 
E) none of the above 
A) 16.1 
B) 19.5 
C) .425 
D) 6.65 
E) none of the above

Question 13

The mass of a proton is 1.67 × 10-27 kg.What is the mass of a proton in nanograms?

Accepted Answer

A) 1.67 × 10-21 ng 
B) 1.67 × 10-18 ng 
C) 1.67 × 10-15 ng 
D) 1.67 × 10-12 ng 
A) 1.67 × 10-21 ng 
B) 1.67 × 10-18 ng 
C) 1.67 × 10-15 ng 
D) 1.67 × 10-12 ng

Question 14

Choose the heterogeneous mixture from the list below.

Accepted Answer

A) sports drink 
B) chlorine gas 
C) black coffee 
D) chicken noodle soup 
E) carbon (graphite) 
A) sports drink 
B) chlorine gas 
C) black coffee 
D) chicken noodle soup 
E) carbon (graphite)

Question 15

A gas phase mixture has a temperature of 643 °C.Calculate the temperature in K.

Accepted Answer

A) 916 K 
B) 873 K 
C) 188 K 
D) 1391 K 
E) 370 K 
A) 916 K 
B) 873 K 
C) 188 K 
D) 1391 K 
E) 370 K

Question 16

What is the area,in m2,of a house that has 1236 square feet of floor space? 
(1 foot = 0.3048 m)

Accepted Answer

A) 376.7 m2 
B) 214.8 m2 
C) 114.8 m2 
D) 687 m2 
E) 573 m2 
A) 376.7 m2 
B) 214.8 m2 
C) 114.8 m2 
D) 687 m2 
E) 573 m2

Question 17

The recommended adult dose of Elixophyllin  ,a drug used to treat asthma,is 105 mg kg-1 of body mass.Calculate the dose in milligrams for a 105-lb person.(1 lb = 453.59 g)

Accepted Answer

A) 22 
B) 1,389 
C) 1.4 
D) 286 
E) 2.9 × $10 ^ { 5 }$ 
A) 22 
B) 1,389 
C) 1.4 
D) 286 
E) 2.9 × $10 ^ { 5 }$

Question 18

Give the composition of water.

Accepted Answer

A) two hydrogen atoms and two oxygen atoms 
B) one hydrogen atom and one oxygen atom 
C) two hydrogen atoms and one oxygen atom 
D) one hydrogen atom and two oxygen atoms 
A) two hydrogen atoms and two oxygen atoms 
B) one hydrogen atom and one oxygen atom 
C) two hydrogen atoms and one oxygen atom 
D) one hydrogen atom and two oxygen atoms

Question 19

An acetylene molecule contains 2 atoms of carbon.The number 2 represents how many significant figures?

Accepted Answer

A) one 
B) two 
C) three 
D) infinite 
A) one 
B) two 
C) three 
D) infinite

Question 20

Which of the following statements about the phases of matter is TRUE?

Accepted Answer

A) In both solids and liquids,the atoms or molecules pack closely to one another. 
B) Solids are highly compressible. 
C) Gaseous substances have long-range repeating order. 
D) There is only one type of geometric arrangement that the atoms or molecules in any solid can adopt. 
E) Liquids have a large portion of empty volume between molecules. 
A) In both solids and liquids,the atoms or molecules pack closely to one another. 
B) Solids are highly compressible. 
C) Gaseous substances have long-range repeating order. 
D) There is only one type of geometric arrangement that the atoms or molecules in any solid can adopt. 
E) Liquids have a large portion of empty volume between molecules.

Exam 1: Units of Measurement for Physical and Chemical Change

Which of the following is an example of a chemical change?

Define random error.

Round off 00907506 to four significant figures.

What answer should be reported,with the correct number of significant figures,for the following calculation? 3.000 × 105 + 614283

A piece of metal ore weighs 8.25 g.When a student places it into a graduated cylinder containing water,the liquid level rises from 21.25 mL to 26.47 mL.What is the density of the ore?

Which of the following represents a chemical property of hydrogen gas?

What answer should be reported,with the correct number of significant figures,for the following calculation? 1.682 × 10-3 + 4.311 × 10-2

If the outside air temperature is 30 °F,what is the temperature in kelvin?

What symbol is used to represent the factor 10-1?

A mass of mercury occupies 0.750 L.What volume would an equal mass of ethanol occupy? The density of mercury is 13.546 g mL−113.546 \mathrm {~g} \mathrm {~mL} - 113.546 g mL−1 and the density of ethanol is 0.789 g mL-1.

Without using a calculator,solve the following problem: [(1×10−8)×(1×105)]2(1×106)\frac { \left[ \left( 1 \times 10 ^ { - 8 } \right) \times \left( 1 \times 10 ^ { 5 } \right) \right] ^ { 2 } } { \left( 1 \times 10 ^ { 6 } \right) }(1×106)[(1×10−8)×(1×105)]2​

What is the volume (in cm3)of a 43.6 g piece of metal with a density of 2.71 g cm-3?

The mass of a proton is 1.67 × 10-27 kg.What is the mass of a proton in nanograms?

Choose the heterogeneous mixture from the list below.

A gas phase mixture has a temperature of 643 °C.Calculate the temperature in K.

What is the area,in m2,of a house that has 1236 square feet of floor space? (1 foot = 0.3048 m)

The recommended adult dose of Elixophyllin ,a drug used to treat asthma,is 105 mg kg-1 of body mass.Calculate the dose in milligrams for a 105-lb person.(1 lb = 453.59 g)

Give the composition of water.

An acetylene molecule contains 2 atoms of carbon.The number 2 represents how many significant figures?

Which of the following statements about the phases of matter is TRUE?

Atoms and Elements

Molecules,compounds,and Nomenclature

Chemical Reactions and Stoichiometry

Gases

Thermochemistry

The Quantum-Mechanical Model of the Atom

Periodic Properties of the Elements

Chemical Bonding I: Lewis Theory

Chemical Bonding II: Molecular Shapes, valence Bond Theory, and Molecular Orbital Theory

Liquids, solids, and Intermolecular Forces

Solutions

Chemical Kinetics

Chemical Equilibrium

Acids and Bases

Aqueous Ionic Equilibrium

Gibbs Energy and Thermodynamics

Electrochemistry

Radioactivity and Nuclear Chemistry

Organic Chemistry I: Structures

Organic Chemistry II: Reactions

Biochemistry

Chemistry of the Nonmetals

Metals and Metallurgy

Transition Metals and Coordination Compounds

Filters

What answer should be reported,with the correct number of significant figures,for the following calculation? 3.000 × 10⁵ + 614283

What answer should be reported,with the correct number of significant figures,for the following calculation? 1.682 × 10^-3+ 4.311 × 10^-2

What symbol is used to represent the factor 10^-1?

A mass of mercury occupies 0.750 L.What volume would an equal mass of ethanol occupy? The density of mercury is $13.546 \mathrm {~g} \mathrm {~mL} - 1$ and the density of ethanol is 0.789 g mL^-1.

Without using a calculator,solve the following problem: $\frac { \left[ \left( 1 \times 10 ^ { - 8 } \right) \times \left( 1 \times 10 ^ { 5 } \right) \right] ^ { 2 } } { \left( 1 \times 10 ^ { 6 } \right) }$

What is the volume (in cm³)of a 43.6 g piece of metal with a density of 2.71 g cm^-3?

The mass of a proton is 1.67 × 10^-27 kg.What is the mass of a proton in nanograms?

What is the area,in m²,of a house that has 1236 square feet of floor space? (1 foot = 0.3048 m)

The recommended adult dose of Elixophyllin ,a drug used to treat asthma,is 105 mg kg^-1 of body mass.Calculate the dose in milligrams for a 105-lb person.(1 lb = 453.59 g)