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WorksheetsChemical equation
Total questions: 36
Worksheet time: 3hrs 0mins
Name
Class
Date
1.
When dry ice (solid carbon dioxide) sublimes it goes directly from a solid to a gas. What type of change is occurring?
a)
Chemical change
b)
Physical change
c)
None of the above
2.
How many oxygen atoms are present in the following?
4Ca(OH)2
4Ca(OH)2
a)
4
b)
6
c)
8
d)
1
3.
Why must we balance chemical equations?
a)
Our teacher said so
b)
to abide by the law of conservation of energy
c)
to abide by the law of conservation of mass
4.
What is changed in a chemical reaction like this one?
NaOH + HCl → NaCl + H2O
NaOH + HCl → NaCl + H2O
a)
the number of atoms is changed
b)
molecules and compounds are changed
c)
atoms are changed
d)
elements are changed
5.
How many E atoms are there in this silly formula?
2E2Fg3Hi4
2E2Fg3Hi4
a)
4
b)
2
c)
1
d)
3
6.
Fill in the blank to balance the chemical equation.
2KI + ____Cl2 → 2KCl + I2
2KI + ____Cl2 → 2KCl + I2
a)
1
b)
2
c)
3
d)
4
7.
What coefficient should go in the blank space to balance the chemical equation?
2Al +____ HCl → 2AlCl3 + 3H2
2Al +____ HCl → 2AlCl3 + 3H2
a)
2
b)
4
c)
3
d)
6
8.
How many atoms of carbon (C) are in C6H12O6?
a)
3
b)
6
c)
12
d)
24
9.
How many Sodium (Na) are in 6NaCl?
a)
1
b)
12
c)
6
10.
How many Aluminum are in Al2O3?
a)
3
b)
2
c)
5
11.
How many Hydrogen are in 4H2O?
a)
6
b)
8
c)
2
d)
4
12.
How many Hydrogen are in 4H2O?
a)
6
b)
8
c)
2
d)
4
13.
How many Hydrogen are in 4H2O?
a)
6
b)
8
c)
2
d)
4
14.
Which of the following shows the correct way to balance the chemical equation?
Fe + O2 -> Fe2O3
Fe + O2 -> Fe2O3
a)
4Fe + 3O2 -> 2Fe2O3
b)
2 Fe + 3O2 -> Fe2O6
c)
4 Fe + O6 -> 2Fe2O3
d)
None of the options are correctly balanced.
15.
Which of the following reactions is balanced?
a)
2CH4 + O2 -> CO2 + H2O
b)
CH4 + 2O2 -> CO2 + H2O
c)
CH4 + 2O2 -> CO2 + 2H2O
d)
None of the chemical equations are balanced.
16.
How many HCl molecules do you need to balance this equation?
Mg + __HCl ---> MgCl2 + H2
Mg + __HCl ---> MgCl2 + H2
a)
1
b)
2
c)
3
d)
4
17.
Balance this equation.
_CF4 + _Br2 -- _CBr4 + _F2
_CF4 + _Br2 -- _CBr4 + _F2
a)
2,1,2,1
b)
1,2,2,1
c)
1,2,1,2
d)
2,2,2,2
18.
The substances listed on the right side of a chemical equation are the
a)
Yields
b)
Reactants
c)
Products
d)
Precipitates
19.
The substances listed on the left side of a chemical equation are the
a)
Products
b)
Coefficients
c)
Precipitates
d)
Reactants
20.
Which is the Law of Conservation of Matter?
a)
matter cannot be created or destroyed, it only rearranges
b)
matter can be created but it cannot be destroyed, it never rearranges
c)
matter can be destroyed but it cannot be created, it usually just rearranges
d)
matter is an unproven theory created by Hans Geiger
21.
Which one is a compound?
a)
Co
b)
Br
c)
Fe
d)
CO
22.
Which one is an element?
a)
Co
b)
CO
c)
CO2
d)
CO3-2
23.
A molecule is smaller than an atom.
a)
True
b)
False
24.
How many Oxygen (O) atoms are in 2C2HO8Cl2
a)
2
b)
16
c)
8
d)
5
25.
How many Hydrogen (H) atoms are in NH3O5
a)
3
b)
4
c)
5
d)
1
26.
Identify the Reactants in this equation.
a)
A
b)
B
27.
What state of matter is this substance?
a)
solid
b)
liquid
c)
gas
d)
aqueous
28.
In what state is this substance?
a)
solid precipitate
b)
dissolved in water
c)
released as a gas
d)
liquid
29.
How many atoms of nitrogen are in the compound shown above?
a)
1
b)
2
c)
3
d)
4
30.
How many atoms of nitrogen are present in this molecule?
a)
1
b)
2
c)
3
d)
4
31.
How many molecules of KNO3 are shown?
a)
1
b)
2
c)
3
d)
4
32.
What is the part of the chemical equation in green called?
Fe + S --> FeS
Fe + S --> FeS
a)
products
b)
reactants
c)
yield
d)
chemical formula
33.
Element or compound?
H2O
H2O
a)
element
b)
compound
34.
What is the best way to balance this equation?
H2 + Cl2 → HCl
H2 + Cl2 → HCl
a)
H2 + Cl2 → HCl
b)
3H2 + Cl2 → 6H2Cl
c)
H2 + Cl2 → 2HCl
d)
2 H2 + 2 Cl2 → 2 HCl
35.
Is this equation balanced?: CS2 + 2 O2 → CO2 +2 SO2
a)
Yes
b)
No
36.
Which of these is NOT correctly matched?
a)
(g) = grams
b)
(aq) = solution
c)
(s) = solid
d)
(l) = liquid
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