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Reactions Review

Total questions: 27

Worksheet time: 3hrs 9mins

Name
Class
Date
1.
Each substance written to the right of the arrow in a chemical equation is a _____.
a)
Reactant
b)
Product
c)
 Precipitate
d)
   Catalyst
2.
According to the law of conservation of mass, how does the mass of the products in a chemical reaction compare to the mass of the reactants?
a)
There is no relationship
b)
The mass of products is sometimes greater.
c)
The mass of reactants is greater
d)
The masses are always equal
3.
Which of the following changes gives NO evidence that a chemical reaction has taken place?
a)
A cube of solid forms a puddle of liquid
b)
A certain liquid is added to a solid, and bubbles of gas form.
c)
Two liquids are mixed, and a precipitate forms.
d)
Heating a blue solid turns the solid white.
4.
Which chemical equation is balanced?
a)
Na  +  O2  -->  Na2O
b)
2Na2  +  O2   --> 2Na2O
c)
2Na  +  2O2  --> 2Na2O
d)
5Na  +  6O2 -->   20NaO
5.
Which equation shows that the total mass during a chemical reaction stays the same?
a)
1
b)
2
c)
3
d)
4
6.
Which of the following statements about the formula for C3H6(Br2)3 is true?
a)
There are 6 atoms of Bromine.
b)
There are 6 atoms of Hydrogen.
c)
There are 3 atoms of Hydrogen.
d)
There are 18 atoms of hydrogen
7.
Determine whether the following chemical equation is balanced or unbalanced
P4 + 5O2 --> P4O10
a)
balanced
b)
unbalanced
8.
An iron nail (Fe) is placed into a solution of copper sulfate (CuSO4).  After some time, the blue color of the copper sulfate disappears and some copper colored solid (Cu) is found on the surface of the nail.  The solution now contains iron sulfate (FeSO4), and the container feels warmer than before the reaction

What are the reactants?
a)
iron and copper sulfate
b)
iron sulfate
c)
iron, copper sulfate, and iron sulfate  
d)
none of the above
9.

In the chemical formula C12H22O11C_{12}H_{22}O_{11}  , how many elements are there?

a)

1

b)

2

c)

3

d)

4

10.

In the chemical formula C12H22O11C_{12}H_{22}O_{11}  , how many C atoms are there?

a)

12

b)

22

c)

11

d)

45

11.

What is the TOTAL number of atoms in the chemical formula C12H22O11C_{12}H_{22}O_{11}  ?

a)

12

b)

22

c)

11

d)

45

12.

Jin bought a heat pack that weighs 15 g. He shook it so it would release heat to warm his hands. The release of heat indicates a chemical reaction took place in a closed system. What would be the mass of the heat pack after the chemical reaction?

a)

5 g

b)

10 g

c)

12 g

d)

15 g

13.
The number in front of a compound or element is a 
a)
Subscript
b)
Coefficient
c)
Superscript
d)
Charge
14.
If reaction starts with 20g of reactants it should produce 
a)
a total of 40g of products
b)
a total of 10g of products
c)
a total of 80 g of products
d)
a total of 20g of products
15.

How does a balanced chemical equation satisfy the Law of Conservation of Mass?

a)

During a chemical reaction, matter is destroyed.

b)

During a chemical reaction, the total number of atoms increases.

c)

 During a chemical reaction, one or more new substances are formed.

d)

During a chemical reaction, the total amount of matter stays the same.

16.

What happens to the total mass of the substances after a chemical reaction?

a)

It decreases.

b)

It increases.

c)

 It remains the same.

d)

It increases then decreases.

17.

A precipitate is a ___________ that forms when 2 liquids react together.

a)

solid

b)

liquid

c)

gas

d)

plasma

18.
Salt dissolves in water
a)
physical Change
b)
chemical change
19.

Match the following

a)

Physical change

(Shape)

1.

Cutting paper

b)

Physical change

(solubility)

2.

Dissolving

Kool-Aid

c)

Chemical Change

(Flammability)

3.

Lighting a match

d)

Chemical Change

4.

Creating a new substance

e)

Both a Physical & Chemical change

5.

Bubbles

20.

Which BEST represents a balanced equation?

a)

HgO --> Hg + O2

b)

2Fe + O2 --> Fe2O3

c)

2H2 + O2 --> 2H2O

21.

Which BEST explains why the equation below is NOT balanced?

2Na + H2O ----> 2NaOH + H2

a)

there is too much sodium in the reactants

b)

there is not enough water in the reactants

c)

there is too much hydrogen gas in the products

d)

there is not enough sodium hydroxide in the products

22.

What is the total number of oxygen atoms on the product side of the equation below?


CH3COOH + NaHCO3 ---> CH3COONa + H2O + CO2

a)

2

b)

3

c)

5

d)

7

23.

A piece of paper has a mass of 13 grams. When the paper is burned, a chemical change occurs and both smoke and ashes are produced. Based on the Law of Conservation of Mass, which statement is true?

a)

the smoke has a mass of 13 grams

b)

the ashes have a mass of 13 grams

c)

the smoke and ashes have a combined mass of 13 grams

d)

the smoke and the ashes have a combined mass less than 13 grams

24.

Which equation is balanced?

a)

NaCl + Mg ----> MgCl2 + Na

b)

2NaCl + Mg ----> MgCl2 + Na

c)

2NaCl + Mg -----> MgCl2 + 2Na

d)

NaCl + 2Mg ------> MgCl2 + 2Na

25.

If a chemical reaction begins with 22 atoms of nitrogen, how many atoms of nitrogen should be in the product?

a)

14

b)

22

c)

44

d)

48

26.

In a chemical reaction, 4 grams of sodium must combine with how many grams of chlorine to produce 10 grams of table salt?

a)

4 grams

b)

6 grams

c)

8 grams

d)

10 grams

27.
24 g of magnesium reacts with 38 g of fluorine to produce _____ g magnesium fluoride
a)
62 
b)
38
c)
24
d)
14

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