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Chemical Reactions and Changes

Total questions: 33

Worksheet time: 46mins

Name
Class
Date
1.

The Law of Conservation of Matter

a)

tells how many atoms of an element are contained in one molecule or formula unit.

b)

the starting materials in a chemical reaction

c)

the new substances that are formed in a chemical reaction

d)

A law stating that atoms are not created or destroyed during a chemical reaction.

2.

Is the equation balanced?: 2H2O + O2 --> 4MgO + 3Fe

a)

yes

b)

no

3.

The coefficient in 3H2O is

a)

6

b)

5

c)

2

d)

3

4.
How many atoms of carbon (C) are in C6H12O6?
a)
3
b)
6
c)
12
d)
24
5.
Is this equation balanced?
a)
yes
b)
no
c)
Not enough information
6.
What is the left part of a chemical equation called?
2H2 + O2 --> 2H2O
a)
Reactants
b)
Products 
c)
Yields 
d)
Chemical Equation 
7.
What is the right part of a chemical equation called...
2H2 + O2 --> 2H2O
a)
Reactants
b)
Products 
c)
Yields 
d)
Chemical Equation 
8.
What is the little number after an element in a chemical equation called.
Example: H2
a)
Coefficient 
b)
Subscript
c)
Atom
d)
Equation
9.
Is the following equation balanced?...
Al + O2 --> 2Al2O3
a)
Yes!
b)
No!
10.
What is the number before a chemical formula called?
Ex: 2H2 + O2 --> 2H2O
a)
Coefficient
b)
Subscript
c)
Atom
d)
Equation
11.
Is the following equation balanced?
2C2H2 + 5O2 --> 4CO2 + 2H2O
a)
yes
b)
no
12.
Is the following equation balanced?
4Fe + 3O2 --> 2Fe2O3
a)
yes
b)
no
13.
Is the following reaction balanced?
NaHCO3 --> Na2CO3 + H2O + CO2
a)
yes
b)
no
14.
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
15.

Balance this equation ​ ​ (a)   N2 + ​ (b)   H2 --> ​ (c)   NH3

Choose from the below words
1
3
2
4
6
16.

Balance this equation

​ (a)   Al +​ (b)   HCl --> ​ (c)   H2 +​ (d)   AlCl3

Choose from the below words
2
6
3
4
17.

Balance this equation. ​ (a)   CF4 + ​ (b)   Br2 -- ​ (c)   CBr4 + ​ (d)   F2

Choose from the below words
1
2
3
4
18.

Balance this equation. ​ (a)   SnO2 +​ (b)   H2-->​ (c)   Sn +​ (d)   H2O

Choose from the below words
1
2
3
4
19.
Which problem is balanced?
(Check ALL answers)
a)
PbO2 + 2H2
b)
SO2 + H20 --> H2SO4
c)
2Na + 2H2O --> 2NaOH + H2
20.

What happens to the atoms in substances when a chemical reaction occurs?

a)

They are rearranged to form new products.

b)

They are destroyed.

c)

New atoms are created to form new products.

d)

Nothing happens.

21.
Iron rusts.
a)
Chemical change
b)
Physical Change
22.
Evaporation
a)
Chemical Change
b)
Physical Change
23.
Ice Melting
a)
Chemical Change
b)
Physical Change
24.
Sugar dissolves in water
a)
Chemical Change
b)
Physical Change
25.
A tire is inflated with air.
a)
Chemical Change
b)
Physical Change
26.
Food is digested in the stomach
a)
Chemical Change
b)
Physical Change
27.
Is freezing juice a physical or chemical change?
a)
Physical Change
b)
Chemical Change
28.

Label the parts of the equation.

a)yields
b)products
c)Subscript
d)Coefficient
e)Reactants
1
2
3
4
5
1)
2)
3)
4)
5)
29.

4 grams of hydrogen and 32 grams of oxygen will combine to form:

a)

36 grams of water

b)

28 grams of hydroxide

c)

32 grams of oxygen

d)

36 grams of deuterium

30.
If reaction starts with 20g of reactants it should produce... 
a)
a total of 40g of product
b)
a total of 10g of product
c)
a total of 80 g of product
d)
a total of 20g of product
31.
What will weigh more when a chemical change is complete?  The reactants before the chemical reaction, or the product after the reaction is complete?
a)
They both will weigh the same
b)
The product always weighs more than the reactant
c)
The reactant will weigh more than the product
d)
They both will loose mass after the reaction
32.
A student notices that an inflated balloon gets larger when it is warmed by a lamp. Which best describes the mass of the balloon as a result of this change?
a)
The mass of the balloon increases because the size of the balloon has increased.
b)
The mass of the balloon increases because the temperature of the balloon has increased.
c)
The mass of the balloon stays the same because the gas inside the balloon still has the same mass after it warms up.
33.

If 20g of reactant form 15g of product, how much gas was produced?

a)

15g

b)

5g

c)

20g

d)

0g

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