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WorksheetsMid term review
Total questions: 59
Worksheet time: 2hrs 18mins
Name
Class
Date
1.
A beaker containing 80 grams of lead(II) nitrate, Pb(NO3)2, in 100 grams of water has a temperature of 30 ºC. Approximately how many grams of the salt are undissolved, on the bottom of the beaker?
a)
20 grams
b)
80 grams
c)
66 grams
d)
14 grams
2.
When 50 grams of potassium chloride, KCl, is dissolved in 100 grams of water at 50 ºC, the solution can be correctly described as:
a)
supersaturated
b)
unsaturated
c)
saturated
3.
At approximately what temperature does the solubility of sodium chloride, NaCl, match the solubility of potassium dichromate, K2Cr2O7?
a)
60 ºC
b)
30 ºC
c)
50 ºC
d)
83 ºC
4.
Increasing the surface area of a solid
a)
causes the solid to ionize
b)
has no effect on the rate of solution
c)
slows the rate of solution
d)
speeds the rate of solution
5.
Increasing the temperature always increases the solubility of a solute in a solvent
a)
true
b)
false
6.
Why do we add salt to the roads when conditions are favorable for icing?
a)
the salt reacts with the water and heats it up
b)
the ratio of solute to solvent increases and therefore lowers the freezing point of water
c)
Salt makes things warmer
7.
The _____________ is the one doing the dissolving (water).
a)
solvent
b)
solute
c)
mixture
d)
reatants
8.
Two liquids that do not dissolve (form a homogeneous mixture) when mixed are called
a)
immiscible
b)
miscible
c)
mixable
d)
immixable
9.
A solution consists of two parts. One part is the substance that is dissolved. What is the name of this part of a solution?
a)
solvent
b)
solution
c)
solute
d)
oxygen
10.
The "like dissolves like" rule is the reason why water cannot dissolve
a)
salt
b)
sugar
c)
vinegar
d)
oil
11.
If an electrical current can run through a solution, it is said to contain
a)
magic
b)
nonelectrolytes
c)
electricity
d)
electrolytes
12.
This is a type of heterogeneous mixture in which the particles are dispersed and do not settle out.
a)
alloy
b)
solution
c)
suspension
d)
colloid
13.
Which of the following is a homogeneous mixture?
a)
ocean water (sand and water)
b)
purified water (bottled water)
c)
Aqueous NaCl
d)
Gravel (rocks and dirt)
14.
This is a heterogeneous mixture in which particles settle out unless it is constantly stirred.
a)
colloid
b)
suspension
c)
solution
d)
alloy
15.
Which property of a substance depends on how much of the substance there is?
a)
mass
b)
density
c)
boiling point
d)
melting point
16.
Mixtures can be ____ into the substances that make them up.
a)
separated
b)
placed
c)
melted
d)
blended
17.
A saturated solution is______
a)
No more solute can be dissolved
b)
More solute can be dissolved
c)
The solvent and solution
18.
What is the only type of mixture that has particles that dissolve and are transparent.
a)
Solutions
b)
Suspensions
c)
Colloids
19.
Amount of solute in a given amount of solvent or solution
a)
Concentration
b)
Miscible
c)
Solute
d)
solubility
20.
True or false? Insoluble means that two substances can dissolve in one another.
a)
true
b)
false
21.
Which of the following is an electrolyte?
a)
sodium chloride
b)
sugar (carbon, oxygen, hydrogen)
c)
water (hydrogen and water)
d)
sand (silicon and oxygen)
22.
The number of moles of solute in one liter of solution
a)
Electrolyte
b)
immiscible
c)
molarity
d)
solution
23.
Jessica made a pitcher of lemonade. What can she do to dilute if she thinks it doesn't taste right?
a)
Add water
b)
Add sugar
c)
Boil the lemonade
d)
Put it in the refrigerator
24.
Solution that contains less solute than a saturated solution under the same conditions
a)
Saturated
b)
unsaturated
c)
supersaturated
d)
solution
25.
Capable of being dissolved
a)
Soluble
b)
concentration
c)
colloid
d)
molarity
26.
type of homogeneous mixture that doesn't let light shine through it.
a)
solution
b)
colloid
c)
suspension
27.
An example of an aqueous solution is_____
a)
Salt water
b)
water
c)
salt
d)
butter
28.
What is the molarity of a solution made from 325.4g of AlCl3 with enough water to make 500.0 mL? (MM of AlCl3 = 133.34 g/mol)
a)
4.88 M
b)
2.44 M
c)
0.651M
d)
0.00488M
29.
What distinguishes a saturated solution from a supersaturated solution?
a)
A saturated solution contains more solute than is theoretically possible at a given temperature.
b)
A supersaturated solution contains less than the maximum amount of solute that is possible at a given temperature.
c)
A saturated solution contains more solute than the same volume of supersaturated solution at the same temperature.
d)
A supersaturated solution contains more solute than is theoretically possible at a given temperature.
30.
How many moles is 4 grams of Calcium?
a)
0.10 moles
b)
10 moles
c)
44 moles
d)
160 moles
31.
How many grams is 1.2 moles of Neon?
a)
0.05 grams
b)
16.6 grams
c)
21.2 grams
d)
24 grams
32.
How many moles are in 6x1022 particles of CO2?
a)
0.1 moles
b)
4.4 moles
c)
10 moles
d)
264 moles
33.
How many particles are in 13.5 grams of Beryllium?
a)
1.5 particles
b)
9 particles
c)
4x1023 particles
d)
9x1023 particles
34.
How many particles are in 13.5 grams of Beryllium?
a)
1.5 particles
b)
9 particles
c)
4x1023 particles
d)
9x1023 particles
35.
2 NaClO3 (s) --> 2NaCl (s) +3 O2 (g)
12.00 moles of NaClO3 will produce how many grams of O2?
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
36.
B2H6 + 3O2 -->2 HBO2 + 2 H2O
What mass of O2 will be needed to burn 36.1 g of B2H6?
What mass of O2 will be needed to burn 36.1 g of B2H6?
a)
13.8 g O2
b)
3.86 mol of O2
c)
124 g O2
37.
2Al + 3H2SO4 -> Al2(SO4)3 + 3H2
How many grams of aluminum sulfate would be formed if 250g H2SO4 completely reacted with aluminum?
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
38.
The combustion of a sample of butane, C4H10, produced 2.46 grams of water. How many grams of butane burned?
a)
4.55 g C4H10
b)
1.59 g C4H10
c)
0.67 g C4H10
d)
3.40 g C4H10
39.
Calculate the molar mass of Mg(OH)2.
a)
33.2 g/mol
b)
41.3 g/mol
c)
86.9 g/mol
d)
58.3 g/mol
40.
How many moles are in 98.3 g of Aluminum Hydroxide?
a)
2.14 mol
b)
1.26 mol
c)
6.63 mol
d)
5.9 mol
41.
4 Al + 3 O2 –> 2 Al2O3 How much aluminum would be needed to completely react with 45 grams of O2?
a)
1.05 moles
b)
3.75 moles
c)
1.875 grams
d)
1.875 moles
42.
In the equation, 2Mg + O2 ---> 2MgO, which are the reactants?
a)
Mg and O
b)
MgO
c)
Mg and MgO
d)
O and MgO
43.
Exothermic reactions...
a)
Absorb energy
b)
Release energy
c)
Release Color
d)
Absorb Color
44.
In chemical reactions, the law of conservation of mass is......
a)
disobeyed
b)
not true
c)
obeyed
d)
used sometime
45.
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
46.
name this reaction, Ca + O --> CaO
a)
Decomposition
b)
Single Replacement
c)
Double Replacement
d)
Combustion
47.
What does the (s) stand for in MgCO3 (s)
a)
soluble
b)
salty
c)
insoluble
d)
gas
48.
What does the (aq) stand for in NaCl (aq)?
a)
solid
b)
aqueous
c)
liquid
d)
gas
49.
Oxygen always has an oxidation number of...
a)
-1
b)
1
c)
2
d)
-2
50.
How many elements are in C6H12O6?
a)
1
b)
2
c)
3
d)
4
51.
Which of the following is a compound?
a)
Co
b)
O2
c)
C
d)
CO2
52.
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
53.
How many atoms are there TOTAL in:
H2SO4
H2SO4
a)
6
b)
5
c)
7
d)
3
54.
The red numbers in the image below represent ________
a)
subscripts
b)
coefficients
c)
I don't know, and don't want to try
d)
None of the answers are correct
55.
The blue numbers in the image below represent ________
a)
I don't know, and don't want to try
b)
coefficients
c)
subscripts
d)
none of the answers are correct
56.
Name ALL the evidences that show a chemical reaction has occurred.
a)
color, gas, light
b)
light, precipitate, odor,
c)
color, gas, light, temperature, precipitate
d)
temperature, smell, light, conductivity, taste
57.
Which equation obeys the law of conservation of mass?
a)
H2 + O2 ------> H20
b)
C + 2H2 ----> CH4
c)
2Fe2O3 ------> 2O2 + 4Fe
58.
In a chemical reaction, everything to the rightof the arrow is called ______________.
a)
Products
b)
Yields
c)
Molecules
d)
Reactants
59.
_P4+_O2
--->
_P2O3
--->
_P2O3
a)
3 P4+1 O2 ---> 2 P2O3
b)
1 P4+1 O2 ---> 2 P2O3
c)
1 P4+ 3 O2 ---> 2 P2O3
d)
1 P4+ 2 O2 ---> 3 P2O3
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