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Chemistry Semester 2 Exam

Total questions: 58

Worksheet time: 2hrs 0mins

Name
Class
Date
1.

Balance this equation

_Al +_HCl --> _H2 +_AlCl3

a)

2,6,3,2

b)

it's already balanced

c)

4,12,3,4

d)

2,1,4,5

2.

Which type of chemical reaction has two or more reactants to make one product?

a)

combustion

b)

single displacement

c)

double displacement

d)

synthesis

e)

decomposition

3.

Identify the following chemical reaction.

2 NaBr + 1 Ca(OH)2 ----> 1 CaBr2 + 2 NaOH

a)

Synthesis (or combination)

b)

Decomposition

c)

Single displacement

d)

Double displacement

4.

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

a)

Synthesis

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

e)

Combustion

5.

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

a)

Synthesis

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

e)

Combustion

6.
How many molecules are there in 31.8 moles of water?
a)
5.28 x 10-23 molecules
b)
1.91 x 1025 molecules
c)
5.28x 10-25
d)
1.91 x 1022
7.

Determine the mass (grams) of 4.20 moles of C6H12

a)

353 g

b)

0.0499 g

c)

337 g

d)

2.53 x 1024 g

8.

Which of the following dimensional analysis setups will correctly convert 4.00x1023atoms of cobalt to moles of cobalt? How many moles of colbalt are there?

a)

setup B : 0.664 mol Co

b)

setup A: 2.41x1047mol Co

c)

setup A : 0.664 mol Co

d)

setup B: 2.41x1047mol Co

9.

When comparing a mole of oxygen and a mole of sulfur, how many atoms does each have?

a)

oxygen has 16 grams of atoms

b)

sulfur has 32.06 grams of atoms

c)

both contains 6.02 x 1023 atoms

d)

can not be determined

10.
Which would have more atoms?
a)

1 mole of Li

b)

1 mole of Au

c)

1 mole of Si

d)

None, all are equal

11.
What is the mole ratio of H2O to H3PO4 in the following chemical equation?   P4O10 + 6 H2O --> 4 H3PO4 
a)
6:4
b)
4:6
c)
1:3
d)
3:1
12.

2Al + 3H2SO4 -> Al2(SO4)3 + 3H2 How many grams of aluminum sulfate would be formed if 250g H2SO4 completely reacted with aluminum?

a)

0.85 g

b)

290 g

c)

450 g

d)

870 g

13.

How many grams are in 7.8 moles of NaCl?

a)

476 grams

b)

460 grams

c)

456 grams

d)

462 grams

14.
What is the molar mass of C6H12O6?
a)

180.16 g/mol

b)

180.12 g/mol

c)

180.24 g/mol

d)

180.06 g/mol

15.

A recipe calls for 133 grams of sugar (C12H22O11) and you want to know how many moles this is.


Which of the following shows the correct setup for this calculation?

a)
b)
c)
d)
16.

When the temperature of a gas decreases (with pressure and amount held constant), does the volume increase or decrease?

a)

Unaltered

b)

Remains constant

c)

Increase

d)

Decrease

17.

Charles' Law deals with what quantities?

a)

pressure/temperature

b)

pressure/volume

c)

volume/temperature

d)

volume/temperature/pressure

18.

IF we are using Boyles' law and our Pressure goes UP, what must our volume do?

a)

Go UP

b)

Go DOWN

c)

Stay the same

d)

Wrong law.

19.
Which container will have a lower pressure?
a)
left
b)
right
c)
they both have the same pressure
d)
I don't know
20.

A student inflates a balloon with helium then places it in the freezer. The student should expect

a)

the balloon's volume to increase

b)

the balloon's volume to decrease

c)

the balloon's moles to increase

d)

the balloon's moles to decrease

21.

6.Which Graph best shows the relationship between Temperature and Volume?

a)

A

b)

B

22.

If a beach ball has a volume of 261 L at a temperature of 502 K, what will be the new temperature of the balloon if the volume decreases to 176 L?

a)

744 K

b)

0.0030 K

c)

339 K

d)

512 K

23.

There are 40 liters of helium in a balloon at a temperature of 100 K. If the temperature of the balloon is increased to 200 K, what will be the new volume of the balloon?

a)

80 L

b)

45 L

c)

54 L

d)

45.33 L

24.
How many grams of sodium nitrate, NaNO3, are soluble in 100 g of water at 10 ºC?
a)

80 grams

b)

100 grams

c)

40 grams

d)

10 grams

25.

(a)   is the least soluble at 90 ⁰C

Choose from the below words
SO₂
KClO₃
KI
HCl
26.
Which is an example of a solvent?
a)
Salt
b)
Egg whites
c)
Water
d)
Sugar
27.
Solutions in which electric currents cannot run through are said to be
a)
noncolloidal
b)
electrolytes
c)
nonelectrolytes
d)
conductors
28.

Tap water is tested to see if it conducts electricity. Based on the image what is distilled water?

a)

Nonelectrolyte

b)

Electrolyte

c)

Insulator

d)

Monoatomic ion

29.
A saturated solution is one that....
a)
contains the maximum amount of dissolved solute.
b)
contains less solute than a saturated solution.
c)
contains more solute than a saturated solution.
d)
is the amount of a substance required to form a saturated solution.
30.
How does a solution become supersaturated?
a)
dissolve lots of solvent in it.
b)
dissolve a little solute in it. 
c)
dissolve more solute than you should be able to. 
d)
dissolve a super amount of solvent in it. 
31.

Match the following words with their definitions

a)

Solute

1.

Substance that dissolves

b)

Solvent

2.

Substance that is used to dissolve

c)

Electrolytes

3.

Compounds that conduct Electricty

d)

Non-Electrolytes

4.

Compounds that do not conduct electricity

e)

Hydrates

5.

Solid Crystals that contain water molecules in their crystal structure

32.

Water molecules are attracted to one another through hydrogen bonding because they are highly​ (a)  

Choose from the below words
Polar
Non-polar
Magnetic
Reactive
33.

A sour taste is a characteristic of: (a)  

Choose from the below words
acids
bases
neutral
pH scale
34.

Which is a characteristic of a base?

a)

tastes sour

b)

found mostly in foods

c)

feels slippery

d)

turn litmus paper red

35.

Acids release what into a solution?

a)

H+ ions

b)

Hydroxide Ions (OH-)

c)

water

d)

salt

36.
Bases are located where on the pH scale?
a)
any number can be a base
b)
below 7
c)
above 7
d)
number 7 is a base
37.

NaOH is:

a)

an Arrhenius base

b)

an Arrhenius acid

c)

neither an acid nor a base

d)

both an acid and a base

38.
What might happen if you mixed a strong acid with an equally strong base?
a)
You would see an explosive chemical reaction.
b)
The acid would destroy the base.
c)
The base would destroy the acid.
d)
You'd wind up with a pH-neutral substance.
39.

The table shows the pH of several solutions. Which solution is the most acidic?

a)

vinegar

b)

milk

c)

water

d)

bleach

40.

Zn(OH)2 is an example of a...

a)

acid

b)

base

c)

salt

d)

water

41.

Four substances were tested for pH, lemon juice (pH 2), baking soda (pH 9), bleach (pH 12), and milk (pH 6). Which of the following correctly lists the substances from most basic to acidic?

a)

lemon juice, milk, baking soda, bleach

b)

bleach, baking soda, milk, lemon juice

c)

milk, lemon juice, baking soda, bleach

d)

baking soda, bleach, lemon juice, milk

42.

What type of reaction is this?

a)

Endothermic

b)

Exothermic

c)

Allergic

43.

Ice cream melting is an example of an __________ process.

a)

endothermic

b)

exothermic

44.

When heat flows from system to the surroundings that is an example of an ________________ process.

a)

exothermic

b)

endothermic

45.

The diagram represents two solids and the temperature of each. What occurs when the two solids are placed in contact with each other?

a)

Heat energy flows from solid A to solid B. Solid A decreases in temperature

b)

Heat energy flows from solid A to solid B. Solid A increases in temperature

c)

Heat energy flows from solid B to solid A. Solid B decreases in temperature.

d)

Heat energy flows from solid B to solid A. Solid B increases in temperature.

46.
Do the reactants in an exothermic reaction have a higher or lower energy than the products?
a)
Higher
b)
Lower
47.

Consider the reaction: 2 H2O + energy --> 2H2 + O2

a)

exothermic because releasing energy

b)

exothermic because absorbing energy

c)

endothermic because absorbing energy

d)

endothermic because releasing energy

48.

Baking pizza in the oven

a)

endothermic

b)

exothermic

49.

You freeze juice to make ice pops.

a)

exothermic

b)

endothermic

50.
What type of reaction occurs in a hand warmer
a)
exothermic
b)
endothermic
51.
Which type of nuclear radiation is being emitted here?
a)
Alpha
b)
beta
c)
gamma 
d)
none
52.
Balance the following equation:
146C --> 0-1e + ________
a)
145B
b)
146C
c)
147N
d)
42He
53.

Which type of nuclear radiation is being emitted here? (You will need to complete the equation to figure it out)

a)

alpha

b)

beta

c)

gamma

d)

none

54.

How is the alpha particle written in a nuclear equation?

a)

42He

b)

24He

c)

0-1e

d)

00γ

55.

Match the radioactive decay particle with its description.

a)

A helium nucleus (2 p+, 2 n0)

1.

alpha particle

b)

an electron

2.

beta particle

c)

wave of energy

3.

gamma ray

56.
If we start off with element 24X50 after an alpha decay we get another element Y that looks like
a)
22Y50
b)
22Y46
c)
20Y48
d)
26Y54
57.

If we start off with element 5024X after an gamma decay we get an element(product) that looks like...

a)

5124X

b)

5023X

c)

5024X

d)

5025X

58.
What particle completes this reaction?
a)
alpha particle
b)
beta particle
c)
gamma particle
d)
neutron

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