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GRHS Chemistry - Conservation of Matter Review

Total questions: 25

Worksheet time: 46mins

Name
Class
Date
1.

Based on the Law of Conservation of Matter, describe the relationship between the mass of the reactants and the mass of the products.

a)

The mass of the products is always greater than the mass of the reactants.

b)

The mass of the reactants is less than the mass of the products.

c)

The mass of the reactants equals the mass of the products.

d)

The mass of the reactants is greater than the mass of the products.

2.

If the mass of a chemical reaction's product is 15 grams, what would the mass of the reactants be?

a)

20 g

b)

15 g

c)

10 g

d)

3 g

3.

Which section represents the products?

a)

A

b)

B

c)

C

4.

2 NaBr + 1 Ca(OH)2 ----> 1 CaBr2 + 2 NaOH

a)

Synthesis (or combination)

b)

Decomposition

c)

Single replacement

d)

Double replacement

5.

2 NH3+ 1 H2SO4 ----> 1 (NH4)2SO4

a)

Synthesis (or combination)

b)

Decomposition

c)

Single replacement

d)

Double replacement

6.
3 Pb + 2 H3PO4 ----> 3 H2 + 1 Pb3(PO4)2
a)
Synthesis (or combination)
b)
Decomposition
c)
Single displacement
d)
Double displacement
7.
CaCO3 ----> CaO + CO2
a)
Synthesis (or combination)
b)
Decomposition
c)
Single displacement
d)
Double displacement
8.

What type of chemical reaction is this one?

C2H2 + O2 --> CO2 + H2O

a)

Decomposition

b)

Combustion

c)

Synthesis

d)

Single Replacement

9.
One reactant into several products.
a)
Decomposition
b)
Synthesis
c)
Combustion
d)
Single Replacement
10.
Two Reactants and One Product
a)
Decomposition
b)
Combination
c)
Combustion
d)
Single Replacement
11.
One element replaces another in a compound.
a)
Synthesis
b)
Combustion
c)
Single Replacement
d)
Double Replacement
12.
How many HCl molecules do you need to balance this equation? 
Mg +  __HCl --->  MgCl2 + H2
a)
1
b)
2
c)
3
d)
4
13.
What is the total number of atoms present in 5Na3PO4
a)
5
b)
40
c)
55
d)
8
14.

Balance this equation

_Al +_HCl --> _H2 +_AlCl3

a)

2,6,3,2

b)

it's already balanced

c)

4,12,3,4

d)

2,1,4,5

15.

Determine the coefficients to make the following equation balanced?

__N2 + __O2--> __NO

a)

1, 1, 1

b)

1, 1, 2

c)

2, 2, 2

d)

1, 2, 2

16.
Which number should go in the blank?
Mn + _ HNO3 → Mn(NO3)2 + H2
a)
1
b)
2
c)
3
d)
0
17.
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
18.
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
19.

In a reaction A + B ----> C, reactant A has 5g and product C has 9g. How many grams does reactant B have?

a)

4g

b)

5g

c)

9g

d)

14g

20.

If a 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

21.
If an element is diatomic it should have a subscript of___
a)
2, always
b)
2, only when it is by itself
c)
it shouldn't have a subscript, it should have a coefficent
22.
The symbol for a substance dissolved in water is
a)
(s)
b)
(l)
c)
(g)
d)
(aq)
23.

In a combustion reaction, one of the reactants is _____.

a)

hydrogen

b)

nitrogen

c)

oxygen

d)

a metal

24.
Balance this reaction: ____ BaS + ____ PtF2 ---> ____ BaF2 + ____ PtS
a)
1,1,1,1
b)
1,2,1,1
c)
1,1,1,2
d)
2,1,1,1
25.
There are two reactants in a chemical equation, and one product.  The mass of the product is 30g.  The mass of the first reactant is 17g.  What must the mass of the second reactant be, if the equation is to follow the law of conservation of mass?
a)
47g
b)
13g
c)
23g 
d)
You cant tell with the given information

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