uniform mixture of two or more mutually miscible substances

What is true of each of the approximately 90 naturally occurring elements?

each has its own distinctive physical and chemical properties

atom or molecule that carries an electrical charge

What is true of oxygen?

it is the most abundant element on Earth

What is true of elements?

elements are the simplest form of matter

What are suspensions?

unstable mixtures of two or more immiscible substances

gaseous mixture that makes up the Earth's atmosphere

What causes oxidation?

addition of oxygen or the loss of hydrogen

What is united with the aid of an emulsifier to create an emulsion?

two or more immiscible substances

loss of oxygen or the addition of hydrogen

What is true of water?

it is the most abundant of all substances on Earth

What is true of liquid?

it is matter with fixed volume but no definite shape

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Chemistry Practice Theory

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Questions 40

Answers

1
What is a solution?
unstable mixture of the largest particles
uniform mixture of two or more mutually immiscible substances
unstable mixture of an emulsion and a reduction
uniform mixture of two or more mutually miscible substances
2
What is an ion with a negative charge?
molecule
neutron
anion
cation
3
What is true of moisturizer?
it is an oil-in-water reduction
it is a water-in-oil emulsion
it is a water-in-oil reduction
it is an oil-in-water emulsion
4
What is true of each of the approximately 90 naturally occurring elements?
though physical properties vary, all have the same chemical properties
each has its own distinctive physical and chemical properties
though chemical properties vary, all have the same physical properties
all share the same physical and chemical properties
5
What is any substance that is dissolved by a solvent to form a solution?
matter
solute
emulsion
suspension
6
What is an ion?
spark discharged during the ionization process
dust particle left over after the ionization process
atom or molecule without an electrical charge
atom or molecule that carries an electrical charge
7
What is true of oxygen?
it is the most abundant element on Earth
it is the least abundant element on Earth
contrary to popular belief, there is no oxygen in the air
it should not be ingested because it is poisonous to humans
8
What is the science that deals with the composition, structure, and properties of matter and how it changes?
physiology
ergonomics
chemistry
biology
9
What has physical properties that we can see, smell, taste, and touch?
energy
radiation
matter
electricity
10
What are substances with a pH above 7.0?
acids
solutions
alkalis
reductions
11
What is true of elements?
elements are the most complex form of matter
in chemistry, the main elements are sunshine, clouds, rain, and snow
there are only five basic elements in the universe
elements are the simplest form of matter
12
What term refers to substances with a pH below 7.0?
solutes
bases
alkalis
acids
13
What type of neutralization reaction forms water and salt?
reduction-compound
solution-compound
acid-alkali
atom-alkali
14
What are suspensions?
unstable mixtures of two or more immiscible substances
chemical compounds made from a reduction and a suspension
stable mixtures of two or more immiscible substances
chemical compounds made from a reduction and a solution
15
What is air?
water vapor that forms clouds
gaseous mixture that makes up the Earth's atmosphere
shell or radiation surrounding Earth
common name for the chemical that makes the sky appear blue
16
What is an atom with a positive electrical charge?
anion
neutron
molecule
cation
17
What term means "water-loving"?
hydrophobic
hydrocentric
hydroactive
hydrophilic
18
What causes oxidation?
addition of hydrogen of the loss of oxygen
addition of oxygen or the loss of hydrogen
addition of both oxygen and hydrogen
loss of both oxygen and hydrogen
19
What is united with the aid of an emulsifier to create an emulsion?
two or more miscible substances
a surfactant and a liquid
a reduction and a solution
two or more immiscible substances
20
What is light a form of?
gas
matter
energy
liquid
21
What is the term that refers to matter in its three physical forms (liquid, solid, gas)?
states of matter
appearances of matter
physical properties
chemical properties
22
What is a difference between water-in-oil (W/O) emulsions and oil-in-water (O/W) emulsion?
O/W emulsions are greasier
W/O emulsions are greasier
W/O emulsions are easily rinsed away with water
O/W emulsions are not easily rinsed away with water
23
What are the two branches of chemistry?
organic and inorganic
anagen and catagen
alkaline and acidic
artificial and natural
24
What elements is found in all living things, whether they are plants or animals?
zinc
helium
carbon
radon
25
What are most skin care products?
solutions of oil and water
emulsions of oil and water
suspensions of oil and water
reductions of oil and water
26
What type of substances has a pH level of 7.0?
neutral
toxic
alkaline
acidic
27
What is reduction?
addition of both oxygen and hydrogen
addition of oxygen or the loss of hydrogen
loss of oxygen or the addition of hydrogen
loss of both oxygen and hydrogen
28
What is true of water?
it is a relatively scarce substance
the human body is made entirely of water
it is the most abundant of all substances on Earth
water comprises a very small portion of the human body
29
What is NOT true of atoms?
they are small particles of elements
all matter is composed of atoms
atoms consist of smaller particles
all atoms are identical
30
What business primarily use oil-in-water emulsions?
salons and spas
auto repair shops
fast-food restaurants
bakeries
31
What is the natural pH of the skin?
5.5
3.5
7.5
7.0
32
What term refers to molecules that contain two or more atoms of the same element?
atomic molecules
elemental molecules
radiological molecules
chemical molecules
33
What element is absent from the compounds studied in inorganic chemistry?
carbon
helium
nitrogen
oxygen
34
How much of the Earth's surface, approximately, is water?
25 percent
100 percent
10 percent
75 percent
35
What is the study of substances that contain carbon?
organic chemistry
carbon chemistry
organic dating
carbon dating
36
What is true of liquid?
it is matter with no fixed volume and no definite shape
it is matter with no fixed volume but definite shape
it is matter with fixed volume but no definite shape
it is matter with fixed volume and definite shape
37
What term means "oil-loving"?
lipophilic
lipophobic
lipocentric
lipoactive
38
What do antioxidants prevent by neutralizing free radicals?
oxidation
ionization
oxygenation
radicalization
39
How much of the air is made up of nitrogen?
three-eighths
two-thirds
four-fifths
one-quarter
40
What does the term miscible mean?
incapable of being ionized
incapable of being mixed
capable of being mixed
capable of being ionized

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