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Chem B Final Exam Review

Total questions: 65

Worksheet time: 2hrs 35mins

Name
Class
Date
1.

PCl5 + ___ H2O → ___ HCl + H3PO4

a)

4, 5

b)

1, 6

c)

3, 8

d)

2,2

2.
Which side of a chemical equation is the reactant side?
a)
Left (before the yields sign)
b)
Right (after the yields sign)
3.
 Mg  +  ___ HCl  →   MgCl2  +   H2
a)
1
b)
2
c)
3
d)
4
4.
Which side of a chemical equation os the product side?
a)
Left (before the yields sign)
b)
Right (after the yields sign)
5.
Which problem is balanced?
a)
PbO2 + 2H2
b)
SO2 + H20 --> H2SO4
c)
2Na + 2H2O --> 2NaOH + H2
6.
What is the little number after an element in a chemical equation called.
Example: H2
a)
Coefficient 
b)
Subscript
c)
Atom
d)
Equation
7.
What does the Law of Conservation of Mass state?
a)
Matter cannot be gained or lost in a chemical reaction.
b)
Matter can only be lost in a chemical reaction.
c)
Matter can only be gained in a chemical reaction.
d)
Matter can be gained and lost in a chemical reaction. 
8.
When balancing equations a ____ can be placed to the left of a formula of a substance to make the equations balanced
a)
charge
b)
subscript
c)
random number
d)
coefficient
9.
How many atoms of carbon (C) are in C6H12O6?
a)
3
b)
6
c)
12
d)
24
10.

The two sides of a chemical equation are called?

a)

Reactants (left) and Products (right)

b)

Ingredients (left) and Product (right)

c)

Cations and Anions

d)

Reactants (left) and Results (right)

11.
How many atoms are there TOTAL in:
H2SO4
a)
6
b)
5
c)
7
d)
3
12.
What is the molar mass of C6H12O6?
a)

180.18 g/mol

b)

180.12 g/mol

c)

180.24 g/mol

d)

180.06 g/mol

13.
If you start with atoms of NaOH and are going to moles of NaOH, how many steps is it?
a)
1
b)
2
c)
3
d)
4
14.
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
15.
2 NaClO3 (s) --> 2NaCl (s) +3 O2 (g)  
12.00 moles of NaClO3 will produce how many grams of O2?
a)
256 g of O2
b)
576 g of O2
c)
288 g O2
16.
2Na + 2H2O → 2NaOH+ H2
How many grams of hydrogen are produced if 120 g of Na are available?
a)
5.2 g
b)
2.6 g
c)
690 g
d)
45 g
17.

What three things does combustion need?

a)

Fuel, oxygen, water

b)

Fuel, oxygen, heat

c)

Heat, oxygen, fire

18.

Conservation of Energy says that...

a)

energy can be created

b)

energy can be destroyed

c)

energy can be transformed

19.

Exothermic reactions release heat into the surroundings, so you observe a...

a)

temperature increase

b)

temperature decrease

c)

no temperature change

20.

Endothermic reactions absorb heat into its atoms, so you observe a...

a)

temperature increase

b)

temperature decrease

c)

no temperature change

21.

Endo means within. Endothermic reactions

a)

Release heat

b)

Absorb heat

c)

Absorb coldness

22.

Exo means outside. Exothermic reactions

a)

Release heat

b)

Absorb heat

c)

Absorb coldness

23.
What happens to the number of atoms during combustion?
a)
The number of atoms decreases
b)
The number of atoms increases
c)
The number of atoms stays the same
d)
The number of atoms fluctuates
24.
Which of the following is an example of combustion?
a)
Melting ice
b)
Boiling water
c)
Burning wood
d)
Mixing salt and water
25.

Which of the following are the products in combustion?

(SELECT ALL THAT APPLY)

a)

Water

b)

Oxygen

c)

Carbon Dioxide

d)

Heat

e)

Fuel (often incl. carbon bonds)

26.

How many zinc(II) atoms are in 65.4 grams of zinc (Zn). (Hint: Look at the periodic table for the Molecular Weight of Zinc. Remember that Grams = MW x Moles)

a)

10

b)

4,277.2

c)

6.02x1023

d)

130.8

27.

1 mole of zinc is how many atoms?

a)

65.4

b)

6.02x1023

c)

6.54x1023

d)

0.000,000,000,000,000,000,000,654

28.
How many atoms of iodine are in a mole of iodine?
a)
53
b)
63.55g
c)
126.9
d)
6.02 x 1023
29.
The number 6.02 x 1023 is called...
a)
Obama's number
b)
Bohr's number
c)
Trump's number
d)
Avogadro's number
30.

What is the molar mass of Br?

a)

79.9 g / mol

b)

79.9 mol / g

c)

35 g / mol

d)

35 mol / g

31.

How many atoms are there in one mole of carbon?

a)

Avogadro's number

b)

28000

c)

6.022x10^23

d)

A lot

32.

B represents

a)

Potential Energy of Products

b)

Potential Energy of Reactants

c)

Change in Enthalpy

d)

Activation Energy

33.

A represents

a)

Potential Energy of Products

b)

Potential Energy of Reactants

c)

Change in Enthalpy

d)

Activation Energy

34.

D represents

a)

Potential Energy of Products

b)

Potential Energy of Reactants

c)

Change in Enthalpy

d)

Activation Energy

35.

Which component of collision theory is represented in the image?

a)

Correct orientation of molecules

b)

molecules collide with sufficient energy

c)

Products become reactants

d)

Molecules form an activated complex

36.

Is the following reaction endothermic or exothermic

a)

endothermic

b)

exothermic

37.

Is the following reaction endothermic or exothermic

a)

endothermic

b)

exothermic

38.

which factor that affect reaction rate is represented?

a)

Temperature

b)

Catalyst

c)

Surface Area

d)

Concentration

39.
Increase in temperature of the reactants can do one of the following
a)
Slow collision frequency
b)
Allow less effective collision between the particles
c)
Cause particles to lose speed
d)
Increase collision between the particles thus increasing the rate.
40.
Grinding a seltzer tablet into powder increases the rate of reaction due to increased
a)
concentration
b)
surface area
c)
temperature
d)
reactants
41.
Which factors increase the rate of a reaction.
a)
increasing temperature
b)
increasing concentration
c)
increasing surface area
d)
all of these
42.
A ______________ is a substance that increases the rate of a reaction without being used up during the reaction. 
a)
catalyst
b)
product
c)
reactant
d)
solute
43.
Increasing the concentration of the reactants will slow down the reaction.
a)
false 
b)
true
44.
Which of these will NOT speed up the rate of reaction between a strip of magnesium and hydrochloric acid?
a)
tightly coil up the strip of magnesium
b)
cut up the strip of magnesium
c)
increase the concentration of the hydrocholoric acid
d)
increase the temperature of the hydrocholoric acid
45.
Products will form faster if____________
a)

the surface area of the reactants are smaller.

b)
temperature is decreased.
c)
concentration of the reactants are increased.
d)
the reaction is not stirred.
46.
What is the unit for molarity?
a)
mass/liters
b)
moles
c)
liters
d)
moles/liter
47.
A measure of the amount of solute in a given amount of solvent or solution is...
a)
saturated
b)
solubility
c)
concentration
d)
miscible
48.
The dissolving medium in a solution is called ... 
a)
colloid
b)
solution
c)
solute
d)
solvent
49.
The substance dissolved in a solution is called ... 
a)
colloid
b)
solution
c)
solute
d)
solvent
50.
What is the molarity of a 2 liter solution containing 5 moles of NaCl?
a)
2.5
b)
0.4
c)
2.5 moles/liter
d)
10 moles/liter
51.
How many moles of NaCl are present in 6000. ml a 1.5 M NaCl solution?
a)
9 moles NaCl
b)
9000
c)
9
d)
4000  moles NaCl
52.
Which of the following word pairs correctly completes the sentence below?
_______ are corrosive substances characterized as having a strong smell, a sour taste, and a _______.
a)
Acids; pH less than 7
b)
Acids; pH greater than 7
c)
Bases; pH greater than 7
d)
Bases; pH less than 7
53.
If an acid is combined with a base of equal strength, the result will most likely be
a)
a neutral solution.
b)
a stronger acid.
c)
impossible to tell without testing the pH.
d)
a stronger base
54.
Which of the following is a base?
a)
orange juice
b)
water
c)
vinegar
d)
dishwashing detergent
55.
 Which of the following is an acid?
a)
shampoo
b)
baking soda
c)
orange juice
d)
water
56.
Pure water has a pH of 7. Pure water _______.
a)
is a base
b)
is a neutral substance
c)
could be either an acid or a base
d)
is an acid
57.
Which type of ion does a base produce when it is dissolved in water?
a)
oxide
b)
oxygen
c)
hydrogen
d)
hydroxide
58.
Which of the following is true about acids and bases?
a)
The lower the pH, the stronger the acid
b)
the higher the pH, the stronger the acid
c)
The lower the pH, the more neutral the acid
d)
The higher the pH, the weaker the base
59.
Explain what happens when a strong acid and a strong base are poured into the same container.
a)
they form separate layers
b)
they mix physically but not chemically
c)
they break apart into separate elements
d)
they react chemically to form a salt
60.
On the pH scale what numbers are bases?
a)
8-14
b)
0-7
c)
7
d)
1
61.
On the pH scale what numbers are acids?
a)
8-14
b)

0-6

c)
7
d)
1
62.
On the pH scale what numbers are neutrals?
a)
8-14
b)
0-7
c)
7
d)
1
63.
The pH scale measures...
a)
...the strength of an acid.
b)
...the strength of hydrogen ions.
c)
...the concentration of hydrogen ions.
d)
...the concentration of an acid
64.

Which of the following word pairs correctly completes the sentence below?

_______ are corrosive substances characterized as having a oily feel, a bitter taste, and a _______.

a)

Acids; pH less than 7

b)

Acids; pH greater than 7

c)

Bases; pH greater than 7

d)

Bases; pH less than 7

65.

Which type of ion does an acid produce when it is dissolved in water?

a)

oxide

b)

oxygen

c)

hydrogen cation

d)

hydroxide

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