Question 1

How many significant figures are there in the measured value 73.150?

Accepted Answer

A)  2
B)  3
C)  6
D)  5
E)  4 D

Question 2

A sample that cannot be separated into two or more substances by physical means is

Accepted Answer

A)  a heterogeneous mixture.
B)  a compound.
C)  either a compound or an element.
D)  an element.
E)  a homogeneous mixture. C

Question 3

How many cubic millimeters equal one cubic meter?

Accepted Answer

A)  104
B)  10-9
C)  103
D)  109
E)  10-3 D

Question 4

Which of the following is an incorrect statement regarding derived SI units?

Accepted Answer

A)  The SI unit of volume is derived from the SI unit of length.
B)  One milliliter is equivalent to one cubic centimeter.
C)  A derived SI unit may also contain a non-SI unit.
D)  Density is a derived SI unit.
E)  The SI unit of energy (joule) is equivalent to kg⋅m2⋅s-2.

Question 5

All of the following are examples of mixtures except

Accepted Answer

A)  supermarket salt.
B)  distilled water.
C)  soft water.
D)  hard water.
E)  drugstore hydrogen peroxide.

Question 6

The distance between atoms is sometimes given in picometers,where 1 pm is equivalent to 1 × 10-12 m.If the distance between the layers of atoms in a particular compound is given as 338 pm,what is the distance in cm?

Accepted Answer

A)  3.38 × 10-6 cm
B)  3.38 × 10-14 cm
C)  3.38 × 10-12 cm
D)  3.38 × 10-8 cm
E)  3.38 × 10-10 cm

Question 7

The state of matter for an object that has both definite volume and definite shape is the

Accepted Answer

A)  gaseous state.
B)  solid state.
C)  mixed state.
D)  elemental state.
E)  liquid state.

Question 8

All the following are examples of chemical changes except

Accepted Answer

A)  aging.
B)  photosynthesis.
C)  fermentation.
D)  perspiration.
E)  respiration.

Question 9

The enthalpy of combustion of n-octane,C8H18,is -4.79 × 107 J/kg.What is the enthalpy of combustion expressed in kJ/g?

Accepted Answer

A)  -4.79 × 1010 kJ/g
B)  -4.79 × 107 kJ/g
C)  -4.79 × 103 kJ/g
D)  -4.79 × 101 kJ/g
E)  -4.79 × 104 kJ/g

Question 10

In a certain chemical reaction,9.11 g of compound A is added to 8.82 g of compound B.Once the reaction is complete,1.38 g of compound A and 1.61 g of compound B remain.What mass of products was produced?

Accepted Answer

A)  20.92 g
B)  7.21 g
C)  14.94 g
D)  7.73 g
E)  2.99 g

Question 11

A(n)_____ is a concise statement or mathematical equation about a fundamental relationship or regularity of nature.

Accepted Answer

A)  ​experiment
B)  ​hypothesis
C)  ​anomaly
D)  ​law
E)  ​theory

Question 12

Which of the following is a homogeneous mixture?

Accepted Answer

A)  gasoline
B)  vegetable oil and water
C)  sugar dissolved in water
D)  A and C
E)  A,B,and C

Question 13

Which of the following statements is not correct?

Accepted Answer

A)  The combustion of methane (a component of natural gas) is a chemical change.
B)  The melting of ice is a physical change.
C)  The dissolution of sugar in water is a chemical change.
D)  The decomposition of sugar into carbon and water when mixed with sulfuric acid is a chemical change.
E)  The evaporation of gasoline is a physical change.

Question 14

Two types of pure substances are

Accepted Answer

A)  compounds and heterogeneous solutions.
B)  compounds and elements.
C)  elements and homogeneous solutions.
D)  compounds and homogeneous solutions.
E)  elements and heterogeneous solutions.

Question 15

The melting point of a certain solid is -39°C.This corresponds to

Accepted Answer

A)  -13°F.
B)  -39°F.
C)  -38°F.
D)  -128°F.
E)  10°F.

Question 16

The correct value of the expression  is

Accepted Answer

A)  ​1×10.
B)  ​1×10510.
C)  ​1×10-350.
D)  ​1×10-430.
E)  ​1×10-120.

Question 17

A 7.45 g sample of calcium carbonate completely decomposes into calcium oxide (lime)and carbon dioxide gas when heated.If 4.17 g calcium oxide is produced,what mass of carbon dioxide must have been formed?

Accepted Answer

A)  3.28 g
B)  11.62 g
C)  31.10 g
D)  0.56 g
E)  2.48 g

Question 18

A 3.60 cm3 sample of solid tin metal has a density of 5.770 g/cm3.What volume does this sample of tin occupy in its liquid state? The density of liquid tin is 6.990g/cm3.

Accepted Answer

A)  2.97 cm3
B)  4.36 cm3
C)  0.09 cm3
D)  145.00 cm3
E)  0.23 cm3

Question 19

In addition to mass,which property of matter must be known to calculate its volume?

Accepted Answer

A)  specific heat
B)  temperature
C)  molecular weight
D)  density
E)  pressure

Question 20

4.41 seconds contain this many nanoseconds.

Accepted Answer

A)  4.41 × 109
B)  4.41 × 1010
C)  4.41 × 1012
D)  4.41 × 108
E)  4.41 × 107

Exam 1: Chemistry and Measurement