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WorksheetsCh 9: Chemical Reactions
Total questions: 28
Worksheet time: 36mins
Name
Class
Date
1.
Which is NOT an example of a chemical change?
a)
Chewing your ham and cheese sandwhich
b)
Photosyntheis in wheat plants
c)
A pig building protein in its muscle tissue
d)
A cow turning grass into milk
2.
Emission of light, absorbing heat, releasing heat, color change, odor, gas bubbles form from a liquid, the entire substance turns from a solid into a liquid, solid particles form from a liquid: Which one of these what NOT a chemical change?
a)
Color change
b)
Releasing heat
c)
Solid particles form from a liquid
d)
The entire substance turns from a solid into a liquid
3.
*Reactant 1 + Reactant 2 -> Product 1 + Product 2
*Reactant 1 + Reactant 2 -> Product 1
*Product 1 + Product 2 -> Reactant 1
*Reactant 1 + Reactant 2 -> Product 1
*Product 1 + Product 2 -> Reactant 1
a)
True / True / False
b)
True / False / True
c)
False / False / True
d)
False / True / False
4.
Symbols used in chemical equations:
*Separates reactants from products and indicates a reversible reaction
*Identifies as a water solution
*Separates reactants from products
*Separates reactants from products and indicates a reversible reaction
*Identifies as a water solution
*Separates reactants from products
a)
↔ / (aq) / →
b)
→ / (aq) / ↔
c)
↔ / → / (l)
d)
→ / ↔ / (l)
5.
When reactants and products are dissolved in a water they are called:
a)
aqueous
b)
wet
c)
equilibrium
d)
is water wet?
6.
When heated, solid potassium chlorate yields solid potassium chloride and oxygen gas.
What is the correct skeletal formula?
What is the correct skeletal formula?
a)
KClO3(s) --> KCl(s) + O2(g)
b)
KClO3(g) --> KCl(g) + O2(s)
c)
KClO3(s) + KCl(s) --> O2(g)
d)
KCl(s) + O2(g) --> KClO3(s)
7.
Hydrogen and bromine gases react to yield hydrogen bromide gas.
Hint: remember Lewis Dot structures & skeleton equations do need to have correct chemical formulas
Hint: remember Lewis Dot structures & skeleton equations do need to have correct chemical formulas
a)
H(g) + Br(g) --> HBr(g)
b)
H2(g) + Br2(g) --> HBr(g)
c)
HBr(g) --> H(g) + Br(g)
d)
HBr(g) --> H2(g) + Br2(g)
8.
Carbon monoxide and oxygen gases react to yield carbon dioxide gas.
Hint: Remember your diatomics & remember skeleton equations do need to have correct chemical formulas
Hint: Remember your diatomics & remember skeleton equations do need to have correct chemical formulas
a)
CO(g) + O2(g) --> CO2(g)
b)
CO2(g) --> CO(g) + O(g)
c)
CO2(g) + O(g) --> CO(g)
d)
CO(s) + O2(l) --> CO2(aq)
9.
Al + Br2 --> AlBr3
N2 + H2 --> NH3
H2 + Cl2 --> 2 HCl
H2 + O2 --> H2O
Which is balanced?
N2 + H2 --> NH3
H2 + Cl2 --> 2 HCl
H2 + O2 --> H2O
Which is balanced?
a)
Al + Br2 --> AlBr3
b)
N2 + H2 --> NH3
c)
H2 + Cl2 --> 2 HCl
d)
H2 + O2 --> H2O
10.
Al(s) + Br2(g) --> AlBr3(s)
Which is the proper balanced equation?
Which is the proper balanced equation?
a)
2 Al(s) + 3 Br2(g) --> 2 AlBr3(s)
b)
3 Al(s) + 2 Br2(g) --> 2 AlBr3(s)
c)
3 Al(s) + 2 Br2(g) --> 3 AlBr3(s)
d)
2 Al(s) + Br2(g) --> 2 AlBr3(s)
11.
a)
A balanced chemical equation
b)
An unbalanced chemical equation
12.
a)
This has coefficients
b)
This has subscripts
c)
This has both
13.
a)
A balanced chemical equation
b)
An unbalanced chemical equation
14.
a)
This has coefficents
b)
This has subscripts
c)
This has both
15.
a)
A product has a coefficient
b)
There are three atoms involved with the reactants
c)
There are three elements in this equation
d)
Mass is conserved in both the left and right reactions
16.
N2 + H2 --> NH3
Balance this:
Balance this:
a)
N2 + 3 H2 --> 2 NH3
b)
2 N2 + 2 H2 --> 3 NH3
c)
3 N2 + H2 --> 2 NH3
d)
N2 + 3 H2 --> 3 NH3
17.
H2 + O2 --> H2O
Balance this:
Balance this:
a)
2 H2 + O2 --> 2 H2O
b)
H2 + 2 O2 --> 2 H2O
c)
H2 + 2 O2 --> H2O
d)
2 H2 + 2 O2 --> H2O
18.
*Does this look balanced?
*How many molecules are the products?
*How many molecules are in the red reactants?
*How many molecules are the products?
*How many molecules are in the red reactants?
a)
Yes / 2 / 3
b)
No / 2 / 3
c)
Yes / 2 / 6
d)
No / 10 / 3
19.
Is mass conserved in this chemical equation?
a)
Yes
b)
No
20.
CH4 + O2 --> CO2 + H2O
Balance this!
Balance this!
a)
CH4 + 2 O2 --> CO2 + 2 H2O
b)
2 CH4 + O2 --> 2 CO2 + H2O
c)
CH4 + 2 O2 --> 2 CO2 + H2O
d)
2 CH4 + O2 --> CO2 + 2 H2O
21.
Fe(s) + O2(g) --> Fe2O3(s)
Balance this!
Balance this!
a)
4 Fe(s) + 3 O2(g) --> 2 Fe2O3(s)
b)
2 Fe(s) + 3 O2(g) --> 2 Fe2O3(s)
c)
3 Fe(s) + 2 O2(g) --> Fe2O3(s)
d)
2 Fe(s) + 3 O2(g) --> Fe2O3(s)
22.
a)
Top: Synthesis / Bottom: Double replacement
b)
Top: Decomposition / Bottom: Double replacement
c)
Top: Synthesis / Bottom: Single replacement
d)
Top: Decomposition / Bottom: Single replacement
23.
*_1_ Mg(OH)2 + _2_ NH3
*_2_ Mg(OH)2 + _3_ NH3
*_3_ Mg(OH)2 + _2_ NH3
How many total hydrogen atoms are there?
*_2_ Mg(OH)2 + _3_ NH3
*_3_ Mg(OH)2 + _2_ NH3
How many total hydrogen atoms are there?
a)
8 / 13 / 12
b)
5 / 11 / 8
c)
6 / 9 / 9
d)
8 / 12 / 13
24.
_*_ KOH + _*_ H3PO4 --> _*_ K3PO4 + _*_HOH
Balance!
Balance!
a)
3 / 1 / 1 / 3
b)
3 / 3 / 1 / 1
c)
3 / 1 / 3 / 1
d)
3 / 2 / 3 / 3
25.
_*_ SeCl6 + _*_O2 --> _*_SeO2 + _*_ Cl2
Balance!
Balance!
a)
1 / 1 / 1 / 3
b)
2 / 2 / 1 / 3
c)
2 / 1 / 2 / 3
d)
3 / 1 / 1 / 3
26.
_*_ SnO2 + _*_H2 --> _*_Sn + _*_ H2O
Balance!
Balance!
a)
1 / 2 / 1 / 2
b)
2 / 1 / 2 / 1
c)
1 / 2 / 2 / 2
d)
2 / 1 / 1 / 1
27.
*Reactants are located on the ___ of the arrow.
*Products are located on the ___ of the arrow.
*Products are located on the ___ of the arrow.
a)
left-side / right-side
b)
right-side / left-side
c)
either, doesn't matter
28.
_*_S8 + _*_ O2 --> _*_SO2
Balance!
Balance!
a)
1 / 8 / 8
b)
1 / 4 / 4
c)
2 / 4 / 8
d)
1 / 8 / 4
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