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Chemical Reactions

Total questions: 50

Worksheet time: 2hrs 46mins

Name
Class
Date
1.
Which of these formulas contain equal numbers of nitrogen atoms?
a)
Formulas I and III
b)
Formulas I and IV
c)
Formulas II and III
d)
Formulas I, II, and V
2.
The reactants are on the left side of the chemical equation.
a)
True
b)
False
3.

How many atoms in all are in a molecule of serotonin?

C10H12N2O

a)
22
b)
24
c)
25
d)
4
4.
Coal contains carbon and other elements. Carbon dioxide forms when coal burns in the presence of oxygen. Which of these is the best evidence that a chemical reaction occurs when coal burns?
a)
The shape of the coal changes
b)
Oxygen is present
c)
A new substance is produced
d)
Coal is made up of more than one element
5.

In a ___________change, a substance changes into a different substance.

a)

Physical

b)

Chemical

6.

Which of these is NOT a sign that a chemical change has occurred?

a)

A loss of transparency

b)

An unexpected color change

c)

A temperature change

d)

The formation of a precipitate

7.

The Law of Conservation of Mass states

a)

that matter exists in all states and reacts the same

b)

that matter can only be changed into new substances by introducing a catalyst

c)

that matter exists in the same state throughout any chemical change

d)

that matter cannot be created or destroyed and that the mass of the products must equal the mass of the reactants

8.

How many Al atoms are in this compound? 4Al2O3

a)

2

b)

8

c)

6

d)

4

9.

How many F atoms are in this compound?

6MgF2

a)

2

b)

6

c)

8

d)

12

10.

a copper penny turning greenish after a few years.

a)

Physical change

b)

Chemical change

11.

Which of the following IS a physical change?

a)

Getting a haircut

b)

Rusty metal

c)

sour milk

d)

A compound

12.
Is sharpening a pencil a physical or chemical change?
a)
Physical 
b)
Chemical
13.

Hammering gold until it becomes flat is an example of a __________.

a)

Chemical Change

b)

Physical Change

14.

When boiling water, the water turns into steam. This is an example of a _______________.

a)

Chemical Change

b)

Physical Change

15.

A bicycle sits out in the rain for a year and rusts. This is an example of a _____________

a)

chemical change

b)

physical change

16.

The Mole provides a specific measure of the number of _____ or _____ in a bulk sample of matter.

a)

atoms or molecules

b)

atoms or grams

c)

grams or kilograms

d)

grams or formula units

17.

A mole of carbon dioxide contains 6.02 x 1023 _____.

a)

atoms

b)

ions

c)

formula units

d)

molecules

18.

The number 6.02 x 1023 is called...(definition for mole)

a)

Obama's number

b)

Bohr's number

c)

Trump's number

d)

Avogadro's number

19.
How many total atoms are in the compound C2H8O ?
a)
11
b)
2
c)
8
d)
1
20.
How many Chlorine are in MgCl2?
a)
2
b)
1
c)
3
21.
How many TOTAL atoms are in this compound?
H2C3O4N5
a)
5
b)
14
c)
15
d)
19
22.
Which is the correct formula for:
 three hydrogen (H)
one sulfur (S)
four oxygen (O)
a)
H3SO4
b)
HSO4
c)
H4S3O
d)
H2O
23.

A chemical equation represents...

a)

what happens in a chemical reaction.

b)

what happens in a algebra problem.

c)

how a physical change takes place.

d)

all of these

24.

The products are on the left side of a chemical equation.

a)

True

b)

False

25.

How many reactants are in A + B ---> C ?

a)

1

b)

2

c)

3

d)

4

26.

If reactants' mass is 18g , what is the mass of the products ?

a)

15

b)

36

c)

81

d)

18

27.
Consider the chemical equation CH4 + 2 O2 → CO2 + 2 H2O. In this equation, CH4 is a
a)
product
b)
reactant
c)
displacement
28.

What are the REACTANTS :

H2O + CO2 → HCO + HO

a)

H2O + CO2

b)

HCO + HO

c)

H2O ONLY

d)

HCO ONLY

29.
This is used to represent the number of each atom being represented. 
a)
A Exponent
b)
The Coefficient
c)
A Molecule
d)
The Subscript
30.

This appears on the left side of a chemical formula, and represents how many moles of molecules there are.

a)

An Atom

b)

The Subscript

c)

A Molecule

d)

The Coefficient

31.
If there are 4 H atoms on the reactant side, how many H atoms will be on the product side? 
a)
2
b)
4
c)
6
d)
You need more information to answer this question
32.
If an atom or molecule DOESN'T have a subscript or coefficient, what number should be used for that atom/molecule? 
a)
0
b)
1
c)
2
d)
No number should be used
33.
Identify the reactant(s) and product(s) of the reaction.
a)
All three are reactants and none are products.
b)
Hydrogen and water are the reactants, and oxygen is the product.
c)
Water and oxygen are the reactants, and hydrogen is the product.
d)
Hydrogen and oxygen are the reactants, and water is the product.
34.

Does this follow the law of conservation of mass:

Yes No

a)

Yes

b)

No

35.
Is wood burning a physical or chemical change?
a)
Physical 
b)
Chemical
36.
Is Gatorade powder dissolving in water physical or chemical change?
a)
Physical 
b)
Chemical
37.
Is mold growing on cheese a physical or chemical change?
a)
Physical 
b)
Chemical
38.
Is copper tarnishing a physical or chemical change?
a)
Physical 
b)
Chemical
39.
The red numbers in the image below represent ________
a)
subscripts
b)
coefficients
c)
I don't know, and don't want to try
d)
None of the answers are correct
40.
The blue numbers in the image below represent ________
a)
I don't know, and don't want to try
b)
coefficients
c)
subscripts
d)
none of the answers are correct
41.
Which of the following reactions is balanced?
a)
2CH4 + O2 -> CO2 + H2O
b)
CH4 + 2O2 -> CO2 + H2O
c)
CH4 + 2O2 -> CO2 + 2H2O
d)
None of the chemical equations are balanced.
42.
How many HCl molecules do you need to balance this equation? 
Mg +  __HCl --->  MgCl2 + H2
a)
1
b)
2
c)
3
d)
4
43.
Is the following equation balanced?...
Al + O2 --> 2Al2O3
a)
Yes!
b)
No!
44.
Is the following equation balanced?
2C2H2 + 5O2 --> 4CO2 + 2H2O
a)
yes
b)
no
45.
Which of the following equations are correctly balanced?
a)
12CO2 +H2O --> C6H12O6 + O2
b)
CO2 + 9H2O --> C6H12O6 + O2
c)
CO2 + H2O --> 3C6H12O6 + O2
d)
6CO2 + 6H2O --> C6H12O6 + 6O2
46.
A + B = AB
a)
Double Replacement
b)
Synthesis
c)
Combustion
d)
Decomposition
47.
AB = A + B
a)
Decomposition
b)
Single Replacement
c)
Combustion
d)
Synthesis
48.

3Mg + N2 --> Mg3N2

a)

Synthesis

b)

Decomposition

c)

Single replacement

d)

Double replacement

49.
Increasing the temperature of a reaction will __________ the rate of the reaction.
a)
increase
b)
decrease
50.

NO2 --> N2 + O2

a)

Synthesis

b)

Decomposition

c)

Single Replacement

d)

double replacement

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