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WorksheetsUnit 3 Review
Total questions: 55
Worksheet time: 14hrs 45mins
Name
Class
Date
1.
PCl5 + ___ H2O → ___ HCl + H3PO4
a)
4, 5
b)
1, 6
c)
3, 8
d)
2,2
2.
__ Al + __ FeO → Al2O2 + __ Fe
a)
1, 1, 2
b)
2,1,2
c)
2, 2, 2
d)
2,4,2
3.
Reduction involves
a)
gaining electrons;
b)
losing electrons;
4.
Exothermic reactions...
a)
Absorb energy
b)
Release energy
c)
Release Color
d)
Absorb Color
5.
In the equation, 2Mg + O2 ---> 2MgO, which are the reactants?
a)
Mg and O
b)
MgO
c)
Mg and MgO
d)
O and MgO
6.
Name this reaction, Cl2 + 2KI --> I2 + 2KCl
a)
Synthesis
b)
Single Replacement
c)
Double Replacement
d)
Decomposition
7.
Name this reaction, Ca + O --> CaO
a)
Decomposition
b)
Single Replacement
c)
Double Replacement
d)
Synthesis
8.
Balance this equation, Ca + H2O --> CaO + H2
a)
Ca + 2H2O --> CaO + 2H2
b)
2Ca + H2O --> CaO + H2
c)
Its balanced as it is
d)
Cannot be balanced
9.
What does the (aq) stand for in NaCl (aq)?
a)
solid
b)
aqueous
c)
liquid
d)
gas
10.
Oxygen always has an oxidation number of...
a)
-1
b)
1
c)
2
d)
-2
11.
Which is the correct balanced equation?
N2 + O2 --> NO
N2 + O2 --> NO
a)
N2 + O2 --> 2NO
b)
2N2 + O2 --> 2NO
12.
How many atoms are there TOTAL in:
H2SO4
H2SO4
a)
6
b)
5
c)
7
d)
3
13.
Compounds break down into simpler substances in this type of reaction.....
a)
Double Replacement
b)
Single Replacement
c)
Synthesis
d)
Decomposition
14.
How many elements are in H2O?
a)
1
b)
2
c)
3
d)
4
15.
Which is the correct formula for:
three hydrogen (H)
one sulfur (S)
four oxygen (O)
three hydrogen (H)
one sulfur (S)
four oxygen (O)
a)
H3SO4
b)
HSO4
c)
H4S3O
d)
H2O
16.
a copper penny turning greenish after a few years.
a)
Chemical Change
b)
Physical Change
17.
Which is NOT an example of chemical change?
a)
production of gas.
b)
change in color.
c)
change in size.
d)
transfer of energy.
18.
The subscripts in a chemical formula can be changed when balancing a chemical equation. True or False?
a)
True
b)
False
19.
Stoichiometry is based on...
a)
chemical reactions with water
b)
balanced chemical reactions
c)
reactions with polyatomic ions
20.
A scientist calculated the yield to be 23.0 grams of a particular product. The actual yield was 14.0 grams. What is the % yield for the reaction in this instance.
a)
60.9%
b)
164.3%
21.
Now, work on the formula for Magnesium Sulfate.
a)
Mg(SO4)2
b)
MgSO4
c)
MgS2
d)
Mg2SO3
22.
Which species is oxidized in the following reaction?
Mg + AlCl3 --> MgCl2 + Al
Mg + AlCl3 --> MgCl2 + Al
a)
Mg
b)
Al
c)
Cl
d)
None because this is not redox.
23.
Which substance is reduced in the following reaction?
NaOH + Li --> LiOH + Na
NaOH + Li --> LiOH + Na
a)
Li
b)
Na
c)
O
d)
H
24.
What is the oxidation number of N in NO2 -1?
a)
-3
b)
+4
c)
-2
d)
+3
25.
Which of the following is NOT a REDOX reaction?
a)
Synthesis
b)
Double Replacement
c)
Single Replacement
d)
Decomposition
26.
A metal can always replace another metal in single replacement reactions because they're cations.
a)
True
b)
False
27.
For single replacement reactions, name the most electronegative nonmetal to the least:
a)
F, Cl, Br, I
b)
Cl, Br, I, F
c)
F, Br, Cl, I
d)
F, I, Br, Cl
28.
When predicting double replacements, the "(S)" on the products side stands for...?
a)
Solution
b)
Solid
c)
Solvent
d)
Salt
29.
What happens to the atom when it is oxidized?
a)
Gains electrons
b)
Loses electrons
30.
What can you do to balance chemical equations?
I. Add subscripts
II. Add coefficients anywhere
III. Add coefficients only in front of formulas
IV. Add and remove elements
I. Add subscripts
II. Add coefficients anywhere
III. Add coefficients only in front of formulas
IV. Add and remove elements
a)
Only I
b)
Only III
c)
Only I, II, III
d)
Only III and IV
31.
This picture represents
a)
Synthesis
b)
Double Replacement
c)
Single Replacement
d)
Decomposition
32.
In a chemical reaction, bonds are broken and new bonds are formed that create new substances. The bonds that are broken are called what?
a)
Reactants
b)
Products
c)
Atoms
d)
Catalysts
33.
If H2O is a product in a double replacement equation, it is _____.
a)
aqueous (aq)
b)
solid (s)
c)
gas (g)
d)
liquid (l)
34.
Solve the problem: Al + O2 --> Al2O3
a)
4Al + 3O2 --> 2Al2O3
b)
2Al + 4O2 --> Al2O3
35.
Solve the problem: Al + S --> Al2S3
a)
Al + 2S --> 2Al2S3
b)
2Al + 3S --> Al2S3
36.
Decomposition occurs when...
a)
Two formulas combine.
b)
A formula breaks apart.
c)
An atom is replaced during a reaction.
37.
A synthesis occurs when...
a)
Two formulas combine.
b)
A formula breaks apart.
c)
An atom is replaced during a reaction.
38.
Mg + ___ HCl → MgCl2 + H2
a)
1
b)
2
c)
3
d)
4
39.
Is this equation balanced?
a)
yes
b)
no
c)
Not enough information
40.
Is this equation balanced?
a)
yes
b)
no
c)
Not enough information
41.
_Na3PO4+_KOH
--->
_NaOH + _ K3PO4
--->
_NaOH + _ K3PO4
a)
1 Na3PO4+3 KOH
--->
3 NaOH + 1 K3PO4
--->
3 NaOH + 1 K3PO4
b)
2 Na3PO4+2 KOH
--->
3 NaOH + 1 K3PO4
--->
3 NaOH + 1 K3PO4
c)
1 Na3PO4+2 KOH
--->
2 NaOH + 1 K3PO4
--->
2 NaOH + 1 K3PO4
d)
3 Na3PO4+3 KOH
--->
3 NaOH + 1 K3PO4
--->
3 NaOH + 1 K3PO4
42.
What is the oxidation number of Fe in FeO?
a)
+1
b)
-1
c)
+2
d)
-2
43.
What is the oxidation of Mn in MnO4-1?
a)
-7
b)
-2
c)
+7
d)
+2
44.
What is the oxidation number of S in SO2?
a)
+4
b)
-1
c)
-4
d)
-2
45.
What is the oxidation number of Nb in NbOF6 -3?
a)
+6
b)
+8
c)
-6
d)
+5
46.
What is the oxidation number of C in COCl2?
a)
-3
b)
+4
c)
-2
d)
+3
47.
What is the oxidation number of H in H2O?
a)
-1
b)
+3
c)
-2
d)
+1
48.
Which elements do not have oxidation numbers?
a)
alkali metals
b)
noble gases
c)
halogens
d)
alkaline earth metals
49.
What is the oxidation number of H in LiH?
a)
-2
b)
+2
c)
-1
d)
+1
50.
The sum of all oxidation numbers in a neutral compound is ___.
a)
0
b)
1
c)
-1
d)
depends on the compound
51.
Is calcium oxidized or reduced in the following reaction?
2CaO--> 2Ca + O2
2CaO--> 2Ca + O2
a)
Oxidized
b)
Reduced
52.
What substance is oxidized in the following reaction?
4Fe + 3O2 --> 2Fe2O3
4Fe + 3O2 --> 2Fe2O3
a)
Iron
b)
Fluorine
c)
Oxygen
53.
Fluorine's oxidation number is (in a compound)
a)
+1
b)
-1
c)
0
d)
-2
54.
An element not in a compound has an oxidation number of ....
a)
1
b)
0
c)
no answer
d)
2
55.
Which of the following elements are diatomic?
a)
Hydrogen, Beryllium, Oxygen, Fluorine
b)
Nitrogen, Iodine, Bromine, Carbon
c)
Fluorine, Chlorine, Helium, Nitrogen
d)
Iodine, Nitrogen, Chlorine, Hydrogen
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