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Unit 4: Types of Reactions & Balancing

Total questions: 50

Worksheet time: 4hrs 10mins

Name
Class
Date
1.
The following is what type of reaction:
PbCl2 + AgNO3 → Pb(NO3)2 + AgCl
a)
Synthesis
b)
Decomposition
c)
Single Replacement
d)
Double Replacement
2.
The following is what type of reaction:
NH3 + HCl  → NH4Cl
a)
Synthesis
b)
Decomposition
c)
Single Replacement Replacement
d)
Double Replacement Replacement
3.
What is decomposition?
a)
putting substances together
b)

breaking compounds apart

c)
element replacing another element in a compoud
d)
burning of a subtance
4.
What type of chemical reaction is this?
Al(OH)3 → Al2O3  + H2O
a)
Decomposition
b)
Combustion
c)
Synthesis
d)
Single Replacement 
5.

What type of reaction involves Ions in two compounds switching "dance partners"? 

a)
Synthesis
b)
Combustion
c)
Single Replacement
d)
Double Replacement
6.

3Ca + 2AlCl3 → 3CaCl2 + 2Al

a)
Synthesis
b)
Decomposition
c)
Single Displacement
d)
Double Displacement
7.

What type of reaction requires you to use the "reactivity series" to determine if the reaction will occur?

a)
Synthesis
b)
Combustion
c)
Single Replacement
d)
Double Replacement
8.

What type of reaction always starts with a hydrocarbon compound that reacts with oxygen and produces carbon dioxide and water?

a)
Decomposition
b)
Synthesis
c)
Combustion
d)
Single Replacement
9.

What type of reaction would have two reactants and one product?

a)
Decomposition
b)
Synthesis
c)
Combustion
d)
Single Replacement
10.
What type a reaction is taking place in this picture?
a)
Synthesis
b)
Decomposition
c)
Single Replacement
d)
Double Replacement
11.

2Pb(NO3)2   →   2PbO +  4NO2  +  O2

a)
Synthesis
b)
Decomposition
c)
Single Displacement
d)
Combustion
12.

3KOH + H3PO4 → K3PO4 + 3H2O

a)
Synthesis 
b)
Decomposition
c)
Single displacement
d)
Double displacement
13.
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
14.

When chemicals react in a closed container, which must be true?

a)

The mass both before and after the reaction is the same.

b)

The mass both before and after the reaction is variable.

c)

The same number of compounds is present both before and after the reaction.

15.
Which problem is balanced?
a)

PbO2 + 2H2 → H2SO4

b)

SO2 + H2O → H2SO4

c)

2Na + 2H2O → 2NaOH + H2

d)

2Na + 2H2O → 2NaOH + H

16.
What is a coefficient?
a)
The small number on the right of the chemical symbol.
b)
The large number to the left of a formula.
17.

Balance this equation. _Mg + _Cl2  → _MgCl2

a)
1, 2,1
b)
already balanced
c)
2,1,1
d)
1,1,2
18.

How many atoms of aluminum are on each side of the following equation:

4Al + 3O2 → 2Al2 O3

a)
2
b)
6
c)
1
d)
4
19.
Number of H in 3(NH₄)₂CrO₄
a)
4
b)
6
c)
8
d)
24
20.

Balance this equation,             Al2O3 → Al + O2 

a)
Cannot be balanced
b)

2Al2O3 → 2Al+3O2 

c)

2Al2O3 → 4Al+3O2 

d)

3Al2O3 → 2Al+O2 

21.

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

a)
Yes
b)
No
22.
What is the left part of a chemical equation called?
2H2 + O2 --> 2H2O
a)
Reactants
b)
Products 
c)
Yields 
d)
Chemical Equation 
23.

Fill in the blanks with coefficient:

PCl5 +__ H2O → __ HCl + H3PO4

a)

4, 5

b)

1, 6

c)

3, 8

d)

2,2

24.
The blue numbers in the image below represent ________
a)
Charges
b)
coefficients
c)
subscripts
d)
none of the answers are correct
25.

Balance this equation: P4 + O2  →  P2O3

a)

3 P4+ O2 → 2 P2O3

b)

 P4+ O2 → 2 P2O3

c)

 P4+ 3 O2 → 2 P2O3

d)

 P4+ 2 O2 → 3 P2O3

26.
How many Elements are in the compound C2H8O ?
a)
2
b)
1
c)
3
d)
0
27.

PCl5 + ___ H2O → ___ HCl + H3PO4

a)

4, 5

b)

1, 6

c)

3, 8

d)

2,2

28.

__ Al + __ FeO → Al2O2 + __ Fe

a)

1, 1, 2

b)

2,1,2

c)

2, 2, 2

d)

2,4,2

29.
 Mg  +  ___ HCl  →   MgCl2  +   H2
a)
1
b)
2
c)
3
d)
4
30.

Balance this equation: CF4  + __Br2  → CBr4  + __F2

a)

2,1

b)

1,2

c)

2,2

d)

already balanced

31.

When solutions of two ionic compounds are combined and a solid forms, the solid is called...

a)

soluble

b)

solution

c)

aqueous

d)

precipitate

32.

Which of the following pairs of solutions produces a precipitate when combined?

a)

Cu(NO3)2 and NaCl

b)

Fe(NO3)3 and MgCl2

c)

Cu(NO3)2 and K2CO3

d)

CaCl2 and NaNO3

33.

When solutions of MgCO3 and Fe2(SO4)3 are combined, what precipitate(s) forms?

a)

MgSO4

b)

neither form a precipitate

c)

MgSO4 and Fe2(CO3)3

d)

Fe2(CO3)3

34.

In this equation, ZnCl2 + LiOH  → Zn(OH)2 + LiCl

Which product is insoluble (a solid)?

a)
zinc hydroxide
b)
lithium chloride
c)
lithium hydroxide
d)
zinc chloride
35.

In this equation, CuCl2 + NaOH  → Cu(OH)2 + NaCl

Which product is insoluble (a solid)?

a)
copper(II) hydroxide
b)
sodium chloride
c)
sodium hydroxide
d)
copper(II) chloride
36.

Which of the following is MOST reactive?

a)

Magnesium

b)

Lead

c)

Tin

d)

Copper

37.

Magnesium chloride + Sodium → ?

a)

Sodium chloride + Magnesium

b)

Magnesium chloride + Sodium chloride

c)

Sodium magnesium + Chlorine

d)

NR

38.

Iron nails + copper oxide → ?

a)

Iron oxide + copper oxide

b)

NR

c)

Iron oxide + copper

d)

Magic

39.

Which one of the following equations correctly represents the reaction of silver nitrate with copper metal? When copper is in a compound, it usually has a +2 charge.

a)
CuNO3(aq) + Ag(s) → Cu(s) + AgNO3(aq)
b)
Cu(s) + 2 AgNO3(aq) → Cu(NO3)2(aq) + 2 Ag(s)
c)
Cu(s) + AgNO3(aq) → CuNO3(aq) + Ag(s)
d)
Cu(s) + Ag(NO3)2(aq) → Cu(NO3)2(aq) + Ag(s)
40.

When copper and magnesium sulphate are mixed together, there is no reaction. Why?

a)

Magnesium is more reactive than copper

b)

Copper is more reactive than magnesium

c)

Copper never reacts with metal salts

d)

Magnesium Sulfate never reacts with metals

41.

What is the correct equation when potassium reacts with water?

a)

2K (s) + H2O (l) --> KOH (aq) + H2 (g)

b)

K (s) + 2H2O (l) --> KOH (aq) + 2H2 (g)

c)

2K (s) + 2H2O (l) --> 2KOH (aq) + H2 (g)

d)

K (s) + H2O (l) --> KOH (aq) + H2 (g)

42.

Which of the following does not react with water?

a)

Lithium

b)

Magnesium

c)

Copper

d)

Calcium

43.

Given the equation ...

2Na(?) + 2H2O(?) → 2NaOH(X) + H2(?)

Which state symbol should be where (X) is?

a)

(s)

b)

(g)

c)

(l)

d)

(aq)

44.

How many HCl molecules do you need to balance this equation? In other words, what is the coefficient in front of HCl when this equation is balanced?
Mg +  __HCl --->  MgCl2 + H2

a)
1
b)
2
c)
3
d)
4
45.

Choose the coefficients that will balance this equation.

? C2H6 (g) + ? O2 (g) --> ? CO2 (g) + ? H2O(l)

a)

1, 1, 1, 1

b)

4, 14, 8, 12

c)

1, 5, 2, 3

d)

2, 7, 4, 6

46.

What type of reaction involves the breaking down of a substance into simpler substances?

a)

Single Displacement Reaction

b)

Double Displacement Reaction

c)

Synthesis Reaction

d)

Decomposition Reaction

47.
__Al + __O2 −> __Al2O3
a)
4,3,2
b)
2,3,1
c)
1,1,1
d)
4,6,2
48.
Balance the following: Fluorine and Aluminum oxide react to produce Aluminum fluoride and Oxygen
a)
6,2,4,3
b)
3,4,2,6
c)
5,1,3,2
d)
3,2,4,3
49.
Which coefficients are required to correctly balance the equation: 
C2S2 + O2 → CO2 + S2O
a)
1, 2, 3, 2
b)
2, 5, 4, 2 
c)
2, 4, 5, 2
d)
2, 3, 5, 2 
50.

Which of the models of a chemical reaction best represents the Law of Conservation of Mass?

a)

A

b)

B

c)

C

d)

D

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