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Unit 4: Chemical Equations and Reactions Review

Total questions: 51

Worksheet time: 34mins

Name
Class
Date
1.
Elements are made of 
a)
many types of atoms 
b)
the periodic table
c)
one type of atom 
d)
molecules 
2.
Two or more atoms chemically bonded together are called a
a)
atom
b)
element
c)
molecule
d)
mixture
3.

What do we call a substance composed of atoms of a singular type?

a)

cell

b)

proton

c)

element

d)

atom

4.

Which term represents the particle that is formed when 2 or more atoms come together as one?

a)

atoms

b)

elements

c)

molecules

d)

compounds

5.

What is the term used for the substances that are formed when 2 or more atoms from differing elements come together?

a)

atoms

b)

elements

c)

molecules

d)

compounds

6.

What is the tiniest representative particle of matter within the entire universe?

a)

cells

b)

gases

c)

atoms

d)

liquids

7.

TRUE OR FALSE:

Every compound is a molecule and every molecule is a compound.

a)

TRUE

b)

FALSE

8.

Are these molecules of elements, compounds or mixtures?

a)

elements

b)

compounds

c)

mixtures

9.

What is sugar? (C6H12O6)

a)

element

b)

compound

c)

mixture

10.
What is gold?
a)
element
b)
compound
c)
mixture
11.

How many atoms are in this formula? H2OH_2O  

a)

2

b)

3

c)

5

d)

1

12.

How many elements are in this molecule? C6H12O6C_6H_{12}O_6  

a)

3

b)

24

c)

12

d)

18

13.

Which of the following are examples of an element? (Select all that are correct)

a)

Hydrogen

b)

Gold

c)

Baking Soda

d)

Citric Acid

e)

Helium

14.

Every __________ is a molecule.

a)

atom

b)

compound

c)

cell

d)

proton

15.

This is the written out expression for a substance and contains each element in it and the number of atoms for that element.

a)

chemical formula

b)

chemical symbol

c)

The Periodic Table of Elements

d)

pure substance

16.

This is a one or two letter representation of each element that is generally close to the element's name. The first letter of this will ALWAYS be capitalized.

a)

chemical symbol

b)

chemical number

c)

atomic number

d)

atomic mass

17.
Number of C's in 2Na₂CO₃
a)
1
b)
2
c)
3
d)
5
18.
The number of Na's in Na₂CO₃
a)
1
b)
2
c)
3
d)
6
19.
How many Elements are in the compound C2H8O ?
a)
2
b)
1
c)
3
d)
0
20.
How many total atoms are in the compound C2H8O ?
a)
11
b)
2
c)
8
d)
1
21.
How many Aluminum are in Al2O3?
a)
3
b)
2
c)
5
22.
How many Magnesium are in 10MgCl2?
a)
10
b)
5
c)
20
23.
In chemical reactions, what does the principle of conservation of mass 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.
d)
Matter is not changed.
24.
Name the part in red:

H2 + O2 -> H2O
a)
Coefficient
b)
Product
c)
Yield
d)
Subscript
25.
The substances listed on the left side of a chemical equation are the
a)
Products
b)
Coefficients
c)
Precipitates
d)
Reactants
26.
Balance this equation:
 2Li + Cl2 -> LiCl
a)
2Li + Cl2 -> 4LiCl2
b)
2Li + Cl2 -> LiCl2
c)
2Li + Cl2 -> 2LiCl
27.
Name the part in red:

H2 + O2 -> H2O
a)
Coefficient
b)
Product
c)
Reactant
d)
Subscript
28.
Is the following equation balanced or unbalanced ? 
Al + O2 --> Al2O3
a)
Balanced
b)
Unbalanced
29.
Is this equation balanced?
a)
yes
b)
no
c)
Not enough information
d)
Left side is balanced
30.
Balance this equation.
_Mg + _Cl2 --> _MgCl2
a)
1, 2,1
b)
already balanced
c)
2,1,1
d)
1,1,2
31.
At the end of chemical reactions, what is the total mass of the reactants compared to the total mass of the products?
a)
the product is doubled
b)
the product is half the mass of the reactants
c)
the mass is the same
d)
the mass changes depending on the reaction
32.
Name the part in red:

_2_H2 + _1_O2 -> _2_H2O
a)
Coefficient
b)
Product
c)
Yield
d)
Subscript
33.
Is this balanced?
Al + O2 → 2Al2O3
a)
Yes
b)
No
34.

What is the arrow in a chemical equation...

H2 + O2 --> H2O

a)

Reactants

b)

Products

c)

Yields

d)

Chemical Equation

35.
Can a same substance undergo both physical and chemical changes.
a)
True
b)
False
36.
How do we know if it is a chemical change?
a)
can be undone
b)
cannot be undone
c)
both
d)
none
37.
Physical changes size and shape of something?
a)
False
b)
True
38.
Ice can be a physical change?
a)
False
b)
True
39.
When something new is created or a substance is broken down into diffrent chemicals, you have a chemical change.
a)
True
b)
False
40.
What kind of properties can only be observed when a substance changes into a different substance?
a)
physical properties
b)
chemical properties
c)
liquid properties
d)
real properties
41.
Is hammering wood together to build a house a chemical or physical change?
a)
chemical
b)
physical
42.
Is burning wood a chemical or physical change?
a)
chemical
b)
physical
43.
Which is a physical change?
a)
burning match 
b)
vinegar in baking soda 
c)
melting butter
d)
cooking an egg
44.
What is an example of a Chemical change?
a)
Ripped paper 
b)
boiled egg
c)
cracked egg
d)
sugar in water
45.
The melting of wax is an example of a
a)
chemical change
b)
physical change
46.
Cutting a log in to small pieces is a chemical change.
a)
true
b)
false
47.
Digesting your food is an example of 
a)
chemical change
b)
physical change
48.
Is gatorade powder dissolving in water physical or chemical change?
a)
Physical 
b)
Chemical
49.
Rust on an iron bar is an example of chemical change.
a)
True 
b)
False
50.
Is the formation of the grand canyon a physical or chemical change?
a)
Physical 
b)
Chemical
51.
Glass Breaking
a)
Physical
b)
Chemical

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