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8th Grade: Chemistry Unit Review

Total questions: 30

Worksheet time: 15mins

Name
Class
Date
1.

For a chemical equation to be balanced, reactants and products must have what?

a)

More atoms in the product than atoms in the reactant

b)

Equal number of compounds

c)

Equal number of molecules

d)

Equal number of atoms of each element

2.

True or False: A "group" on the periodic table is also known as a "family".

a)

True

b)

False

3.
The number of valence electrons an atom has can be determined by looking at what?
a)
The atom’s period number
b)
The atom’s group/family number
c)
The atom’s atomic number
d)
The atom’s atomic mass
4.
The number of an atom's valence electrons directly affects the atom's what?
a)
Atomic mass
b)
Physical properties
c)
Reactivity
d)
Atomic number
5.

In an atom, which of the following has a NEGATIVE charge?

a)

Protons

b)

Neutrons

c)

Electrons

d)

Protons & neutrons

6.
Which of the following is the definition of a chemical change?
a)
A new substance is produced
b)
Matter is lost during a chemical change
c)
New matter is created
7.
Elements in the same________ have similar chemical & physical properties.
a)
Family
b)
Group
c)
Neither answer is correct
d)
Both answers are correct
8.

To follow The Law of Conservation of Mass, an element's atoms in the product must do what?

a)

Equal number of atoms in the reactant

b)

Be less than its number of atoms in the reactant

c)

Be greater than its number of atoms in the reactant

9.
An element from Group 1 is most likely to react with an element from Group ___
a)
18
b)
1
c)
17
d)
2
10.
True or False: As a result of a chemical reaction, atoms are changed into different atoms. 
a)
True
b)
False- atoms are simply rearranged
11.
Fill in the blanks: A(____)=P(____)=E(_____)
a)
Atomic #=
Protons=Electrons
b)
Atom=Protons=
Electrons
c)
Atomic Mass=Protons=valence Electrons
12.

Which of the following groups contains elements with a completed electron shell?

a)

1

b)

18

c)

15

d)

3

13.
If given the number of protons, an elements __________ can then be determined.
a)
Atomic mass
b)
# of neutrons
c)
Atomic #
14.
The production of gas, change in odor, & the production of a precipitate all represent a what?
a)
Physical change
b)
Chemical change
15.
 If a temp change occurs WITHOUT an outside source, a _____________ has occurred 
a)
Chemical reaction
b)
Physical reaction
16.

When elements are bonded together to form a compound, what happens to their properties?

a)

They remain the same

b)

They disappear

c)

They change

d)

They become stronger

17.
A neutron has what kind of charge?
a)
Positive
b)
Negative
c)
No charge
18.
 Mass number can be found by doing what? 
a)
Counting the number of electrons
b)
Subtracting number of electrons from number of neutrons
c)
Adding electrons and protons
d)
Adding protons and neutrons
19.

True or False: Different atoms CAN have the same number of protons in their nucleus

a)

True

b)

False

20.
Elements that have properties of both metals and nonmetals are considered to be what?
a)
Noble gasses
b)
Alkaline
c)
Metalloids
d)
non-existent
21.
The atomic number of an element is also the number of what that an element has?
a)
Protons
b)
Electrons
c)
Protons and electrons
d)
neutrons
22.

The elements on the diagonal line of the periodic table are called what?

a)

Metalloid

b)

Non-metals

c)

Alkaline metals

d)

Metals

23.

What is the formula for finding the Density of an element?

a)

D=mv

b)

D=m/v

24.
In the equation H2O, how many of each element is shown?
a)
H=2 O=1
b)
H=2 O=2
c)
H=1 O=1
25.
In a chemical equation, the Mass of the Reactant must ________ the Mass of the Product 
a)
Be greater than
b)
Be less than
c)
Equal to
26.
How many atoms of each element are in the following equation? Al4C3O
a)
Al=12 C=12 O=4
b)
Al=4 C=3 O=1
c)
Al=4 C=3 O=4
d)
Al=7 C=3 O=3
27.
How many different elements are in the formula ZnCl2
a)
3
b)
2
c)
4
d)
0
28.

You can look at a model of an element & determine its identity by counting the element's what?

a)

Number of electron clouds

b)

Total number of protons and neutrons

c)

Protons

d)

Valence electrons

29.
EVERY organic substance contains what?
a)
Oxygen (O)
b)
Carbon (C)
c)
Nitrogen (N)
d)
Sulfur (S)
30.
True or False: If the measured density of an object is LESS THAN "0", the object will float?
a)
True
b)
False: Density has to be GREATER THAN “0” to float

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