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chemical equations

Total questions: 50

Worksheet time: 1hrs 10mins

Name
Class
Date
1.

In the equation shown, what are the reactant(s)?

a)

N2 + H2

b)

NH3

2.

In the equation shown, what are the product(s)?

a)

N2 + H2

b)

NH3

3.

To balance an equation you should:

a)

ONLY change subscripts.

b)

ONLY change coefficients.

c)

Change BOTH subscripts and coefficients.

4.

How many Mn atoms are found in the following compound?

2MnO4

a)

1

b)

2

c)

4

d)

8

5.

What is the little number after an element in a chemical equation called?

Example: H2

a)

Coefficient

b)

Atom

c)

Subscript

d)

Equation

6.

What is the number before a chemical formula called?

Example: 2H2 + O2 ---> 2H2O

a)

Coefficient

b)

Atom

c)

Subscript

d)

Equation

7.

Balance this equation:

H2 + Cl2 ---> HCl

a)

It is balanced.

b)

H2 + Cl2 ---> 2HCl

c)

3H2 + Cl2 ---> 6HCl

d)

H2 + 3Cl2 ---> 6HCl

8.

Balance this equation:

HgO ---> 2Hg + O2

a)

It is balanced.

b)

2HgO ---> 2Hg + O2

c)

2HgO ---> Hg + O2

d)

HgO ---> Hg + 2O2

9.

Balanced this equation:

Sb2S3 + O2 ---> Sb + SO2

a)

It is balanced.

b)

Sb2S3 + O2 ---> 2Sb + SO2

c)

Sb2S3 + 3O2 ---> 2Sb + 3SO2

d)

3Sb2S3 + 3O2 ---> 2Sb + SO2

10.

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

11.
How many HCl molecules do you need to balance this equation? 
Mg +  __HCl --->  MgCl2 + H2
a)
1
b)
2
c)
3
d)
4
12.

Copper and silver sulfate produces copper (II) sulfate and silver

a)

Cu + Ag2SO4 --> CuSO4 + Ag

b)

Cu2 + Ag2SO4 --> CuSO4 + Ag

c)

Cu + Ag2S --> CuS + Ag

d)

Cu2 + AgSO4 --> CuSO4 + Ag2

13.

Aluminum and oxygen produces aluminum oxide

a)

Al + O2 --> Al2O3

b)

Al + O --> Al2O3

c)

Al3 + O2 --> Al2O3

d)

Al + O --> AlO

14.

Calcium oxide and water produces calcium hydroxide

a)

CaO + H2O --> Ca(OH)2

b)

Ca2O2 + H2O --> Ca(OH)2

c)

CaO + H2O --> CaOH

d)

Ca2O2 + H2O --> Ca(OH)2

15.

Barium metal and water yields barium hydroxide and hydrogen gas

a)

Ba + H2O --> Ba(OH)2 + H2

b)

Ba2 + H2O --> Ba(OH)2 + H

c)

Ba + H2O --> BaOH2 + H

d)

Ba2 --> Ba(OH)2 + H2

16.

Aluminum bromide and chlorine gas produce aluminum chloride and bromine gas.

a)

AlBr3 + Cl2 --> AlCl3 + Br2

b)

AlBr3 + Cl --> AlCl3 + Br

c)

Al3Br + Cl --> Al3Cl + Br2

d)

AlBr3 + Cl2 --> AlCl3 + Br

17.

sodium phosphate and calcium chloride produce calcium phosphate and sodium chloride

a)

Na3PO4 + CaCl2 --> Ca3(PO4)2 + NaCl

b)

Na3PO4 + CaCl2 --> Ca4PO2 + NaCl

c)

NaPO4 + CaCl2 --> Ca(PO4)2 + NaCl

d)

NaPO4 + CaCl2 --> Ca2(PO4)3 + NaCl

18.

Potassium chlorate solid when heated produces potassium chloride solid and oxygen gas.

a)

KClO3 + heat --> KCl + O2

b)

PClO3 + heat --> PCl + O2

c)

KClO3 + heat --> KCl + O

d)

KCl + heat --> KCl + O2

19.

Hydrogen gas and nitrogen monoxide gas forms water and nitrogen gas.

a)

H2 + NO --> H2O + N2

b)

H + NO --> H2O + N

c)

H2 + N2O3 --> H2O + N2

d)

H + NO --> H2O + N2

20.

Magnesium metal reacts with oxygen to form magnesium oxide. The correct equation is

a)

Mg2 + O2 --> MgO

b)

Mg + O2 --> MgO

c)

Mg2 + O2 --> Mg2O2

d)

Mg2 + O2 --> MgO

21.

When hydrogen reacts with sulfur, a smelly gas, dihydrogen monosulfide, is produced.

a)

H2 + S → HS

b)

H2 + S → H2S

c)

H + S→ HS

d)

H + S→ H2S

22.

When lead reacts with oxygen, a yellow lead(II) oxide powder is produced.

a)

Pb + O2 → PbO

b)

Pb + O2→ PbO2

c)

Pb2 + O2→ Pb2O

d)

Pb + O → PbO

23.
Which is the correct formula for the compound formed between beryllium and nitrogen?
a)
BeN
b)
Be3N
c)
Be3N2
d)
Be2N3
24.
Which type of chemical reaction is shown?
a)
double replacement
b)
composition
c)
combustion
d)
decomposition
25.
Which type of reaction can be recognized by the general pattern?
a)
combustion
b)
single replacement
c)
composition
d)
decomposition
26.
What is the correct ratio of coefficients to balance this chemical equation?
a)
1:2:3
b)
1:2:1:5
c)
2:4:3
d)
1:1:2
27.
Which type of reaction is Al  +  O2   → Al2O3?
a)
composition
b)
decomposition
c)
single replacement
d)
combustion
28.
Identify the type of chemical reaction demonstrated by this equation:
KClO3  →  KCl  +  O2
a)
decomposition
b)
combustion
c)
compositions
d)
single replacement
29.
Which type of chemical reaction is this an example of?
Fe2(SO4)3  + KOH →  K2SO4  +  Fe(OH)3
a)
composition
b)
double replacement
c)
single replacement
d)
combustion
30.
Identify the type of reaction shown by this chemical equation:
Al  +  HCl  →  AlCl3  +  H2
a)
single replacement
b)
composition
c)
double replacement
d)
decomposition
31.

Which is the correctly balanced equaition?

a)

Cl2 + 2NaI → 2NaCl + I2

b)

Cl2 + 2NaI → NaCl + 2I2

c)

Cl2 + NaI → NaCl + I2

d)

2Cl2 + NaI → 2NaCl + I2

32.
C4H12 + O2 --> CO2 + H2O
a)
Synthesis
b)
Combustion
c)
Single Replacement
d)
Double Replacement
33.
PbCl2 + AgNO3 ---> Pb(NO3)2 + AgCl 
a)
Synthesis
b)
Decomposition
c)
Single Replacement
d)
Double Replacement
34.

Balancing the following:

____ Al + ____ HCl → ____ AlCl3 + ____ H2

a)
1,3,1,2
b)
2,3,2,3
c)
2,6,2,3
d)
3,2,6,2
35.
Write a Balanced Equation for this reaction:
C2H4 + 2 O2 -->
a)
C2O2 + H4
b)
CO2 + HOH
c)
CO + H
d)
2 CO2 + 2H2O
36.
What are the correct formulas and coefficients for the products of the following single-replacement reaction?
Mg + Al(OH)3 →
a)
No Reaction
b)
Al + Mg(OH)3
c)
2 Al + 3 Mg(OH)2
d)
3 Al + MgOH3
37.
in a reaction, aqueous barium chloride reacts with aqueous potassium carbonate to produce solid barium carbonate and aqueous potassium chloride. what is the correct balanced equation.
a)
Ba2Cl(aq) + KCO3(aq) --> BaCO3(s) + KCl(aq)
b)
BaCl2(aq) + K2CO3(aq) --> BaCO3(s) + 2KCl(aq)
c)
BaCl(aq) + K2CO3(aq) --> BaCO3(s) + K2Cl(aq)
d)
Ba2Cl2(aq) + KCO3(aq) --> Ba2CO3(s) + KCl2(aq)
38.
 Predict the product(s):  H2O -->
a)
H and O
b)
H2 and O2
c)
H and OH
39.

Predict the product of the following synthesis reaction.

Ca + N2 -->

a)

CaN2

b)

CaN

c)

Ca3N2

d)

CaNNot

40.

Predict the products of the following reaction. No need to balance.


Al + HCl -->

a)

AlCl + H

b)

AlCl3 + H2

c)

HAl + Cl

d)

H3Al + Cl2

41.

Predict the products of the following reaction. No need to balance.


ZnCl2 + H2S -->

a)

ZnS + HCl

b)

ZnS + H2Cl2

c)

SZn + ClH

d)

H2Zn + Cl2S

42.

Predict the products of the following reaction. No need to balance.


C2H5OH + O2 -->

a)

CO2 + H2O

b)

C + O2 + H2

c)

C2O4 + H2O

d)

CO + H2 + O2

43.

What are the products of the following decomposition reaction?
 binary compound ⟶ ??binary\ compound\ \longrightarrow\ ??  

a)

element + element

b)

metal oxide + water

c)

metal chloride + oxygen

d)

metal oxide + carbon dioxide

e)

nonmetal oxide + water

44.

What are the products of the following decomposition reaction?

 metal chlorate ⟶ ??metal\ chlorate\ \longrightarrow\ ??  

a)

element + element

b)

metal oxide + water

c)

metal chloride + oxygen

d)

metal oxide + carbon dioxide

e)

nonmetal oxide + water

45.

What are the products of the following decomposition reaction?

 metal carbonate ⟶ ??metal\ carbonate\ \longrightarrow\ ??  

a)

element + element

b)

metal oxide + water

c)

metal chloride + oxygen

d)

metal oxide + carbon dioxide

e)

nonmetal oxide + water

46.

What are the products of the following decomposition reaction?
 Fe3P2 ⟶ ??Fe_3P_2\ \longrightarrow\ ??  

a)

element + element

b)

metal oxide + water

c)

metal chloride + oxygen

d)

metal oxide + carbon dioxide

e)

nonmetal oxide + water

47.

What are the products of the following decomposition reaction?

 Mg(ClO3)2 ⟶Mg\left(ClO_3\right)_2\ \longrightarrow  

a)

element + element

b)

metal oxide + water

c)

metal chloride + oxygen

d)

metal oxide + carbon dioxide

e)

nonmetal oxide + water

48.

What are the products of the following decomposition reaction?
 TiBr4 ⟶ ??TiBr_4\ \longrightarrow\ ??  

a)

 Ti + BrTi\ +\ Br  

b)

 Ti2 + Br2Ti_2\ +\ Br_2  

c)

 Ti + Br2Ti\ +\ Br_2  

d)

 Ti + Br4Ti\ +\ Br_4  

e)

 Ti2 + BrTi_2\ +\ Br  

49.

What are the products of the following decomposition reaction?
 Li2CO3 ⟶ ??Li_2CO_3\ \longrightarrow\ ??  

a)

 Li + C + OLi\ +\ C\ +\ O  

b)

 Li2O + CO2Li_2O\ +\ CO_2  

c)

 Li + C + O2Li\ +\ C\ +\ O_2  

d)

 Li + CO3Li\ +\ CO_3  

e)

 Li4C+ O2Li_4C+\ O_2  

50.

What are the products of the following decomposition reaction?
 Ni(ClO3)3 ⟶ ??Ni\left(ClO_3\right)_3\ \longrightarrow\ ??  

a)

 Ni + Cl + ONi\ +\ Cl\ +\ O  

b)

 Ni2O3 + ClO2Ni_2O_3\ +\ ClO_2  

c)

 Ni + Cl2 + O2Ni\ +\ Cl_2\ +\ O_2  

d)

 NiCl3 + O2NiCl_3\ +\ O_2  

e)

 Ni2O3+ Cl2Ni_2O_3+\ Cl_2  

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