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Chem Review of 3rd Nine Weeks

Total questions: 55

Worksheet time: 2hrs 19mins

Name
Class
Date
1.

What is collision theory?

a)

Molecules must collide in the correct orientation with enough energy to bond.

b)

Molecules need enough energy to collide and react.

c)

Atoms constantly collide and react.

d)

The minimum energy needed for atoms to react

2.

The process by which one or more substances change to produce one or more different substances

a)

Chemical Process

b)

Reactant

c)

Chemical Reaction

3.

What part of the equation does the #1 represent?

a)

product

b)

produces/yields

c)

solid

d)

reactant

4.

The two (2) is indicating _________.

a)

subscripts

b)

reactants

c)

coefficients

d)

aqueous

5.

The three (3) indicates which part?

a)

reactants

b)

products

c)

equation

d)

formulas

6.

Number seven (7) is indicating ____ of the equation.

a)

reactants

b)

products

c)

equation

d)

formulas

7.
Which of the following shows the correct way to balance the chemical equation?
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.
8.
Sodium reacts with chlorine to produce sodium chloride.
a)
NaCl(s) → Cl(g) + Na(s)
b)
Na(s) + CO2(g) → NaCO2(s)
c)
2Na(s) + Cl2(g) → 2NaCl(s)
d)
Na(s) + Cl(g) → NaCl
9.
Iron reacts with sulfur to produce iron(II) sulfide powder.
a)
2Fe(s) + S(s) → Fe2S(s)
b)
Fe(s) + S(s) → FeS(s)
c)
Fe(s) + S(g) → FeS(s)
d)
4Fe(s) + S2(g) → 2Fe2S
10.

What reaction has the following general formula:
 CxHy + O2 −>CO2 + H2OC_xH_y\ +\ O_2\ ->CO_{2\ }+\ H_2O  

a)

Combination

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

e)

Combustion

11.

What type of reaction is the following:
 BaCl2+2KI −> 2KCl + BaI2BaCl_2+2KI\ ->\ 2KCl\ +\ BaI_2  

a)

Combination

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

e)

Combustion

12.

What type of reaction is the following:
 2KI −> 2K + I22KI\ ->\ 2K\ +\ I_2  

a)

Combination

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

e)

Combustion

13.

What type of reaction is the following:
 Zn + 2HCl −> ZnCl2+H2Zn\ +\ 2HCl\ ->\ ZnCl_2+H_2 

a)

Combination

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

e)

Combustion

14.

What type of reaction is the following:
 2H2+O2−>2H2O2H_2+O_2->2H_2O  

a)

Synthesis

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

e)

Combustion

15.
Predict the products for the this reaction:
K + HCl --> 
a)
KCl + H2
b)
KHCl 
c)
KH + Cl2
d)
KCl + H
16.
Write a balanced equation for this DR reactions
NaOH + Fe(NO3)3 -->
a)
NaFe + OH(NO3)3
b)
2NaNO3 + 3Fe(OH)3
c)
NR
d)
3NaNO3 + Fe(OH)3
17.
If an atom loses electrons during a chemical reaction, the atom was:
a)
Oxidized
b)
Reduced
c)
Neutralized
d)
Precipitated
18.
What is oxidation number of H in H2O?
a)
0
b)
-2
c)
-1
d)
+1
19.
What is oxidation number of Cr in Cr2O72-?
a)
-2
b)
+2
c)
+6
d)
+12
20.
What is oxidation number of Fe in FeO ?
a)
+2
b)
-2
c)
0
d)
+1
21.
What is oxidation number of O in O2 ?
a)
0
b)
-2
c)
+1
d)
+2
22.
What element is being Oxidized?
a)
N
b)
H
c)
O
d)
S
23.
What element is being Reduced?
a)
N
b)
H
c)
O
d)
S
24.
What is the species that lose electrons in a redox reaction?
a)
oxidizing agent
b)
reducing agent
c)
is reduced
d)
decreases in oxidation number
25.
What is the species that gain electrons in a redox reaction?
a)
oxidizing agent
b)
reducing agent
c)
is oxidized
d)
increases in oxidation number
26.
What is the reducing agent of this reaction?
3Mg + N2−−−−> Mg3N2
a)
Mg
b)
N2
c)
Mg3N2
d)
MgN
27.

NaOH may be found in drain cleaners and as a component of soaps. Is NaOH an acid or a base?

a)

Acid

b)

Base

c)

Neither (Neutral)

28.

HCl is found in household products, including some toilet bowl cleaners. Is HCl an acid or a base?

a)

Acid

b)

Base

c)

Neither (Neutral)

29.
What is the pH of a 1 x 10-8 M solution of HNO3?
a)
8
b)
6
c)
7
d)
7.5
30.
If the pH of a solution is 5.6 the pOH is
a)
6.5
b)
12.4
c)
8.4
d)
5.6
31.

What is the concentration of a solution of Ca(OH)2 with a pH of 12?

a)

0.01

b)

0.005

c)

0.02

d)

1E-12

32.

Determine the concentration of a HNO3 solution with a pH of 2.5.

a)

0.0032

b)

0.0034

c)

0.034

33.
What is the conjugate acid in the following equation?
a)
PO43- 
b)
HNO3 
c)
NO3- 
d)
HPO42-
34.

How do Bronsted-Lowry conjugate acid-base pairs differ?

a)

differ by one H+

b)

Differ by one OH-

c)

Differ by two H+

d)

Differ by some number of H+

35.

Given the reaction above, which compound is the bronsted-Lowry Conjugate base, if HCl is the acid?

a)

NH3

b)

NH4+

c)

Cl-

36.

What is the main purpose of acid-base titrations?

a)

To test if reactants react.

b)

To calculate the concentration of unknown analyte.

c)

To calculate the concentration of known analyte.

d)

To test quality of reactants.

37.
Change from standard form to scientific notation:  450,000
a)
4.5  x  105
b)
45  x  105
c)
4.5  x  104
d)
4.5  x  106
38.
Try to change the number back to standard form:  6.79  x  104
a)
679,000
b)
6,790
c)
67,900
d)
6,790,000
39.
What is the density of a liquid that has a mass of 27g and a volume of 30ml?
a)
0.9 g/ml
b)
3 g/ml
c)
57 g/ml
d)
810 g/ml
40.
How many significant figures: 216 m
a)
1
b)
2
c)
3
d)
0
41.
How many significant figures: 153.0 mL
a)
1
b)
2
c)
3
d)
4
42.
How many significant figures: 2016 m
a)
1
b)
2
c)
3
d)
4
43.
How many significant figures: 2016 m
a)
1
b)
2
c)
3
d)
4
44.

How many molecules are there in 31.8 moles of water? (H2O has a molar mass of 18.0 g/mol)

a)

572 g

b)

1.91 x 1025 molecules

c)

5.28x 10-25 molecules

d)

1.77 g

45.

What is the mass of 0.75 moles of (NH4)3PO4?

a)

0.0044 g

b)

91 g

c)

110 g

d)

74 g

46.

Given the equation:

2NaClO3 (s) → 2NaCl (s) + 3O2 (g)

2.00 moles of NaClO3 will produce how many grams of O2? (mass of O2 = 32g/mol)

a)

56 g of O2

b)

96 g of O2

c)

64 g O2

d)

32 g O2

47.
Using the following equation:
Fe2O3(s) + 3H2(g) → 2Fe(s) + 3H2O(l)
How many moles of iron can be made from  6 moles H2? 
a)
4 moles Fe
b)
6 moles Fe
c)
9 moles Fe
d)
2 moles Fe
48.
2Na + 2H2O → 2NaOH+ H2
How many grams of hydrogen are produced if 120 g of Na are available?
a)
5.27 g
b)
2.6 g
c)
690 g
d)
45 g
49.
CH4  +  2O2  →  CO2  +  2H2O
24 grams of CH4 was added to the above reaction. Calculate the theoretical yield of CO2.
a)
66 grams
b)
132 grams
c)
33 grams
d)
8.72
50.
Theoretical yield = 73g
Actual yield = 62g
Calculate the percent yield.
a)
1.16%
b)
116%
c)
85%
d)
76%
51.
Use the equation 2 Al + 3 Cl2 ---> 2 AlCl3.  If 2 moles of aluminum and 2 moles of chlorine are reacted, identify the limiting reactant.
a)
AlCl3
b)
Cl2
c)
Al
52.
The limiting reactant
a)
slows the reaction down
b)
is used up first
c)
is the reactant that is left over
d)
controls the speed of the reaction
53.

Given the equation 2 Mg + O2 --> 2 MgO
If 1 mole of Mg reacts with 1 mole of O2 and Mg is the limiting reactant, how many moles of o2 would be left over at the end of the reaction?

a)

2 moles

b)

1 mole

c)

0.5 mole

d)

3 moles

54.
How many liters would you need to make a 1 M solution if you have 6 mol of Sodium Hydroxide? 
a)
2
b)
3
c)
4
d)
6 
55.
What is the molarity of 4 g of NaCl (MM=58.45) in 3,800 mL of solution?
a)
0.018 M
b)
0.0011 M
c)
1.052 M
d)
0.062 M

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