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WorksheetsSchott - 8th Grade Chem Exam Review
Total questions: 45
Worksheet time: 23mins
Name
Class
Date
1.
Which is NOT an example of a pure substance?
a)
Baking Soda
b)
Salt
c)
Pepper
d)
Sugar
2.
Which is a physical property?
a)
burning paper
b)
rusting nail
c)
freezing water
d)
fireworks exploding
3.
What is a chemical property?
a)
describes its ability to change into different substances
b)
can be observed without changing it into another substance.
c)
When atoms combine, a force of attraction between two atoms
d)
is the measurement of the amount of matter in the object
4.
An element is...
a)
the basic particle by which all elements are made from
b)
a pure substance that cannot be broken down into any other substance by chemical or physical means
c)
a homogeneous mixture where particles cannot be seen
d)
a pure substance made of two or more elements chemically combined in a set ratio of atoms
5.
Which is an example of a solution?
a)
Iced tea
b)
salad
c)
damp soil
d)
salad dressing
6.
Endothermic changes...
a)
release energy
b)
energy remains unchanged
c)
occurs when fireworks explode
d)
absorb energy
7.
Density is
a)
Length x Height x Width
b)
measured in kilograms
c)
mass per volume
d)
the amount of space an object takes up
8.
Which is an example of an exothermic reaction?
a)
ice melting
b)
fireworks exploding
c)
coloring paper purple
d)
photosynthesis
9.
A compound is
a)
made of two or more substances, elements, compounds, or both, that are in the same place, but are not chemically combined
b)
a homogeneous mixture where particles cannot be seen
c)
a pure substance made of two or more elements chemically combined in a set ratio of atoms
d)
is the basic particle by which all elements are made from
10.
What is an atom?
a)
is the basic particle by which all elements are made from
b)
a pure substance that cannot be broken down into any other substance by chemical or physical means
c)
A single kind of matter that is pure having a specific makeup and specific properties
d)
is the amount of space that matter occupies
11.
What does BOYLE'S Law state?
a)
When the temperature of a gas is increased at the constant pressure its volume increases
b)
When a pressure of a gas at a constant temperature is increased the volume of the gas decreases
c)
When pressure of a gas is increases, the volume increases
12.
On a graph, which axis is the manipulated variable?
a)
X Axis
b)
Y Axis
13.
The atomic number tells us
a)
the number of neutrons
b)
the number of protons
c)
the number of protons + neutrons
d)
the number of isotopes
14.
Each family in the periodic table has its own chemical properties based on the number of
a)
neutrons
b)
valence electrons
c)
protons
d)
anions
15.
When an atom gains an electron it becomes a
a)
positive ion
b)
negative ion
c)
neutral ion
d)
polyatomic ioc
16.
Where are the most reactive elements found on the periodic table?
a)
Group 1
b)
Period 1
c)
Groups 13 through 16
d)
Group 18
17.
Which group of elements shares characteristics with both metals and nonmetals?
a)
salts
b)
halogens
c)
metalloids
d)
lanthanides
18.
The greater the speed of particles in a container, the
a)
fewer collisions there will be
b)
greater the pressure
c)
lower the pressure
d)
lower the temperature
19.
The elements that do not ordinarily form compounds
a)
carbon family
b)
halogens
c)
alkali metals
d)
noble gases
20.
What can you predict based on an element's location on the periodic table?
a)
its properties
b)
its chemical name
c)
its chemical symbol
d)
its atomic mass
21.
What is a property shared by most ionic compounds?
a)
low melting point
b)
low boiling point
c)
high melting point
d)
valence electrons
22.
What is a polyatomic ion?
a)
negative
b)
made of more than one atom
c)
postive
d)
neutral
23.
What type of bond is formed when electrons are shared?
a)
Polar
b)
Ionic
c)
Covalent
d)
Hydrogen
24.
Name this compound K2S
a)
Potassium Sulfide
b)
Potassium Sodide
c)
Krypton Sodide
d)
Krypton Suflide
25.
In what form can an ionic compound conduct electricity?
a)
as a solid
b)
dissolved in water
c)
as a crystal
26.
In which type of covalent bond are electrons shared unequally?
a)
Molecular bond
b)
Double bond
c)
Ionic Bond
d)
Polar Bond
27.
Ionic compounds are considered to be
a)
charged
b)
neutral
c)
positive
d)
negative
28.
What can you tell about H2O from its molecular formula?
a)
It contains 2 oxygen atoms
b)
It contains 2 hydrogen atoms
c)
It contains 1 hydrogen atom
d)
It is made of 4 total atoms
29.
What type of reaction is AgNO3 + KCl --> AgCl + KNO3 ?
a)
Synthesis
b)
Decompostion
c)
Single Replacement
d)
Double Replacement
30.
What does the principle of conservation mean?
a)
Matter is not created or destroyed
b)
The total mass of the reactants is greater than the total mass of the products
c)
The total mass of the reactants is less than the total mass of the products
31.
The minimum amount of energy that has to be added to start a reaction is
a)
inhibitor
b)
exothermic
c)
endothermic
d)
activation
32.
Material used to increase the rate of reaction
a)
catalyst
b)
inhibitor
c)
activation
d)
thermal
33.
What does a coefficient tell you?
a)
number of atoms in each molecule in the reaction
b)
number of elements in the reaction
c)
number of molecules or atoms of each substance in the reaction
d)
number of molecules in each atom in the reaction.
34.
EVERY chemical reaction involves
a)
a change in mass
b)
a change in energy
c)
a change in concentration
d)
a change in state
35.
Which of these statements about a column on the periodic table is true?
a)
The elements have similar properties
b)
The elements have a wide range of properties
c)
The elements have the same atomic number
d)
The elements have the same atomic mass.
36.
Particles of a solid
a)
are tightly packed together and stay in a fixed position
b)
are free to move in a container but remain in close contact
c)
are free to fill up all space available
37.
According to Charles' Law, when the temperature of a gas increases at constant pressure, its
a)
volume decreases
b)
volume increases
c)
particles move more slowly
d)
temperature increases
38.
Most metals are NOT
a)
ductile
b)
malleable
c)
liquid at room temperature
d)
good conductors of heat and electricity
39.
How is a solute different from a solvent in a solution?
a)
The solute is present in a smaller amount
b)
The solute is present in a greater amount
c)
The solute is a solid and the solvent is a liquid.
40.
What is one way to increase the solubility of sugar in water?
a)
Heat the water
b)
Chill the water
c)
Increase the amount of sugar
d)
Decrease the amount of water
41.
A measure of how well a solute can dissolve in a solvent at a given temperature is that substance's
a)
saturation point
b)
acidity
c)
solubility
d)
dissolvability
42.
Which is the best, scientific way to tell whether an unknown solution is salt or sugar in water?
a)
Taste the solution
b)
Smell the solution
c)
Test the conductivity of the solution
d)
Make cookies with the solution
43.
What is a suspension?
a)
a liquid mixture in which particle can be seen and easily separated by settling or filtration
b)
the substance present in the smaller amount
c)
the temperature at which a substance boils
d)
a homogeneous mixture where particles cannot be seen
44.
Which is the SI unit for mass?
a)
ounce
b)
pound
c)
kilogram
d)
gram
45.
The density of a block of wood with a volume of 2 cubic centimeters and a mass of 10 grams is
a)
0.2 g/cm3
b)
20 g/cm3
c)
5 g/cm3
d)
5 kg/cm3
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