Quiz about General Chemistry Midterm Review

Question 1

Identify the activity that belongs in the field of chemistry.

Accepted Answer

all of the above

Answer

developing medicines

Answer

analysis of a compound

Answer

production of a new plastic

Question 2

Which of these chemicals is definitely inorganic?

Accepted Answer

one that is made of nitrogen and hydrogen

Answer

one that is made of carbon and hydrogen

Answer

one that is made of nitrogen and carbon

Answer

one that is made of carbon and oxygen

Question 3

Which of the following is not a step for solving a numeric word problem?

Accepted Answer

conclude

Answer

calculate

Answer

analyze

Answer

evaluate

Question 4

Identify the false statement.

Accepted Answer

Biodiesel is a fossil fuel.

Answer

Chemistry plays an important role in efforts to increase the world's food supply and to protect crops.

Answer

Potato plants with a jellyfish gene will glow when they need to be watered.

Answer

Chemists are working to develop more pest-resistant and disease-resistant plants.

Question 5

A hypothesis is

Accepted Answer

a proposed explanation for what is observed.

Answer

an observation recorded from an experiment.

Answer

a summary of the results of many experiments.

Answer

a well-tested explanation for many observations.

Question 6

Which of the following is not a part of the scientific method?

Accepted Answer

proving

Answer

experimenting

Answer

Observing

Answer

hypothesizing

Question 7

Identify the false statement.

Accepted Answer

A scientific law fully explains a set of observations.

Answer

The scientific method is a logical, systematic approach to the solution of a problem.

Answer

For the results of an experiment to be accepted, the experiment must produce the same results no matter how many times it is repeated.

Question 8

Which of these steps of the scientific method involves stating a relationship but not proposing an explanation for the relationship?

Accepted Answer

theory

Answer

observation

Answer

scientific law

Answer

Hypothesis

Question 9

All of the following are general characteristics of a substance in the liquid state except

Accepted Answer

definite shape.

Answer

definite volume.

Answer

able to flow.

Answer

not easily compressed.

Question 10

In the chemical reaction: iron plus oxygen yields iron oxide,

Accepted Answer

oxygen is a product.

Answer

iron oxide is a reactant.

Answer

iron is a reactant.

Answer

iron is a product.

Question 11

Which term does not fit with the others listed?

Accepted Answer

reactant

Answer

solid

Answer

gas

Answer

liquid

Question 12

The chemical symbol for sodium is

Accepted Answer

Na.

Answer

NA.

Answer

SO.

Answer

So.

Question 13

A basketball has more mass than a golf ball because:

Accepted Answer

the basketball contains more matter.

Answer

the basketball takes up more space.

Answer

the golf ball contains a different kind of matter.

Answer

the golf ball has an indefinite composition.

Question 14

A gas is a form of matter that

Accepted Answer

takes the shape and volume of its container.

Answer

has a definite volume.

Answer

is generally a liquid or solid at room temperature.

Answer

is difficult to compress.

Question 15

Homogeneous mixtures

Accepted Answer

are known as solutions.

Answer

are always liquids.

Answer

consist of two or more phases.

Answer

have a composition that is fixed.

Question 16

Physical properties of a substance include

Accepted Answer

all of the above

Answer

color and odor

Answer

malleability

Answer

melting and boiling points

Question 17

When iron and oxygen combine to form iron oxide,

Accepted Answer

a chemical change occurs.

Answer

a physical change occurs.

Answer

a change of state occurs.

Answer

a change in mass occurs.

Question 18

Any part of a sample with uniform composition and properties is called a phase.

Accepted Answer

True

Answer

False

Question 19

A substance does not have a fixed composition.

Accepted Answer

False

Answer

True

Question 20

A heterogeneous mixture consists of two or more phases.

Accepted Answer

True

Answer

False

Question 21

A vapor is a gaseous substance that is generally a liquid at room temperature.

Accepted Answer

True

Answer

False

Question 22

A compound can be physically separated into its elements.

Accepted Answer

False

Answer

True

Question 23

How many significant figures are in the measurement 2103.2 g?

Accepted Answer

5

Answer

2

Answer

3

Answer

4

Question 24

Which of these equalities is not correct?

Accepted Answer

10 kg = 1 g

Answer

100 cg = 1 g

Answer

1000 mm = 1 m

Answer

1 cm3 = 1 mL

Question 25

How many of the zeros in the measurement 0.000 040 200 m are significant?

Accepted Answer

3

Answer

2

Answer

7

Answer

8

Question 26

The closeness of a measurement to its true value is a measure of its:

Accepted Answer

accuracy.

Answer

usefulness.

Answer

precision.

Answer

reproducibility.

Question 27

A metric unit of volume is the:

Accepted Answer

L.

Answer

mg.

Answer

km.

Answer

K.

Question 28

The number of seconds in a 40-hour work week can be calculated starting with the conversion:

Accepted Answer

60 s = 1 min

Answer

1 s = 2600 ms

Answer

40 h = 120 s

Answer

40 h = 5 days

Question 29

The metric prefix kilo- means:

Accepted Answer

1000 times larger.

Answer

100 times smaller.

Answer

1000 times smaller.

Answer

100 times larger.

Question 30

The temperature reading of 14C corresponds to a Kelvin reading of:

Accepted Answer

287 K.

Answer

297.6 K.

Answer

-287 K.

Answer

259 K.

Question 31

A conversion factor:

Accepted Answer

is a ratio of equivalent measurements.

Answer

is equal to 1.

Question 32

Chlorine boils at 239 K. What is the boiling point of chlorine expressed in degrees Celsius?

Accepted Answer

93C

Answer

34C

Answer

61C

Answer

34C

Question 33

A student measures a volume as 25 mL, whereas the correct volume is 23 mL. What is the percent error?

Accepted Answer

8.7%

Answer

0.087%

Answer

0.92%

Answer

8.0%

Question 34

The nucleus of an atom is

Accepted Answer

positively charged and has a high density.

Answer

negatively charged and has a low density.

Answer

negatively charged and has a high density.

Answer

positively charged and has a low density.

Question 35

The number of neutrons in the nucleus of an atom can be calculated by

Accepted Answer

subtracting the number of protons from the mass number.

Answer

adding together the numbers of electrons and protons.

Answer

subtracting the number of protons from the number of electrons.

Answer

adding the mass number to the number of protons.

Question 36

The sum of the protons and neutrons in an atom equals the

Accepted Answer

mass number.

Answer

atomic number.

Answer

number of electrons.

Answer

atomic mass.

Question 37

All atoms of the same element have the same:

Accepted Answer

number of protons.

Answer

number of neutrons.

Answer

mass number.

Answer

mass.

Question 38

Which of these statements is false?

Accepted Answer

Electrons have a mass of 1 amu.

Answer

Electrons have a negative charge.

Answer

The nucleus of an atom is positively charged.

Answer

The neutron is found in the nucleus of an atom.

Question 39

An atom of an element with atomic number 48 and mass number 120 contains

Accepted Answer

48 protons, 48 electrons, and 72 neutrons.

Answer

72 protons, 48 electrons, and 48 neutrons.

Answer

120 protons, 48 electrons, and 72 neutrons.

Answer

72 protons, 72 electrons, and 48 neutrons.

Question 40

How do the isotopes hydrogen-2 and hydrogen-3 differ?

Accepted Answer

Hydrogen-3 has two neutrons.

Answer

Hydrogen-3 has one more electron than hydrogen-2.

Answer

Hydrogen-3 has three protons.

Answer

Hydrogen-2 has no protons.

Question 41

The number 80 in the name bromine-80 represents

Accepted Answer

the mass number.

Answer

the atomic number.

Answer

the sum of protons and electrons.

Answer

none of the above

Question 42

The electron configuration of calcium is

Accepted Answer

1s22s22p63s23p64s2

Answer

1s22s22p23s23p34s2.

Answer

1s22s22p103s23p4.

Answer

1s22s23s23p6 3d8.

Question 43

The maximum number of electrons that can occupy the third principal energy level is

Accepted Answer

18.

Answer

32.

Answer

2.

Answer

8.

Question 44

As the frequency of light increases, the wavelength

Accepted Answer

decreases.

Answer

increases.

Answer

remains the same.

Answer

approaches the speed of light.

Question 45

In order to occupy the same orbital, two electrons must have

Accepted Answer

opposite spin.

Answer

the same direction of spin.

Answer

low energy.

Answer

opposite charge.

Question 46

Stable electron configurations are likely to contain

Accepted Answer

filled energy sublevels.

Answer

high-energy electrons.

Answer

unfilled s orbitals.

Answer

fewer electrons than unstable configurations.

Question 47

In the periodic table, there is a periodic pattern in the physical and chemical properties of elements when they are arranged in order of

Accepted Answer

increasing atomic number.

Answer

increasing atomic mass.

Answer

increasing electronegativity.

Answer

increasing atomic radius.

Question 48

Which sublevel corresponds to the transition metals in the periodic table?

Accepted Answer

d

Answer

s

Answer

p

Answer

f

Question 49

The representative elements are

Accepted Answer

Group A elements.

Answer

inner transition metals.

Answer

transition metals.

Answer

Group B elements.

Question 50

Which of the following elements is a metalloid?

Accepted Answer

As

Answer

Se

Answer

Br

Answer

Kr

Question 51

The alkali metals do not include

Accepted Answer

Ca.

Answer

Li.

Answer

Na.

Answer

Rb.

Question 52

How many valence electrons does an atom of any element in Group 6A have?

Accepted Answer

6

Answer

2

Answer

4

Answer

8

Question 53

Metals are good conductors of electricity because they

Accepted Answer

contain mobile valence electrons.

Answer

form crystal lattices.

Answer

contain positive ions.

Answer

form ionic bonds.

Question 54

In forming chemical bonds, atoms tend to attain

Accepted Answer

the electron configuration of noble gas atoms.

Answer

a state of higher energy.

Answer

the electron configuration of halogen atoms.

Answer

all of the above

Question 55

An ionic compound is

Accepted Answer

all of the above

Answer

electrically neutral.

Answer

held together by ionic bonds.

Answer

composed of anions and cations.

Question 56

Which of these is not a characteristic of most ionic compounds?

Accepted Answer

has a low melting point

Answer

solid at room temperature

Answer

conducts an electric current when melted

Answer

produced by reaction between metallic and nonmetallic elements

Question 57

A metallic bond is a bond between

Accepted Answer

valence electrons and positively charged metal ions.

Answer

the ions of two different metals.

Answer

a metal and nonmetal.

Answer

none of the above

Question 58

Which element when combined with chlorine would most likely form an ionic compound?

Accepted Answer

lithium

Answer

carbon

Answer

phosphorus

Answer

bromine

Question 59

A cation is any atom or group of atoms with

Accepted Answer

a positive charge.

Answer

no charge.

Answer

a negative charge.

Answer

more electrons than the corresponding atoms.

Question 60

When melted, ionic compounds conduct electricity.

Accepted Answer

True

Answer

False

Answer

Only in solid state

Answer

Only in gaseous state

Question 61

Metals are ductile because the cations in a piece of pure metal are insulated from one another by a sea of electrons.

Accepted Answer

True

Answer

False

Answer

Only in alloys

Answer

Only in non-metals

Question 62

Metal atoms are arranged in a face-centered cubic structure.

Accepted Answer

True

Answer

False

Answer

Only in liquid state

Answer

Only in gaseous state

Question 63

During the formation of ionic compounds, electrons are transferred from one atom to another.

Accepted Answer

True

Answer

False

Answer

Only in covalent compounds

Answer

Only in metallic compounds

Question 64

Which of these elements does not exist as a diatomic molecule?

Accepted Answer

He

Answer

I

Answer

F

Answer

H

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