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Standardized Test Prep: Chemistry
Standardized Test Prep: Chemistry
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1
1. An acid has a measured Ka
a
of 3 times 10
-6
.
All is true.
The acid is a strong electrolyte
The acid is a strong acid.
An aqueous solution of the acid would have a pH < 7.
2
A real gas behaves most nearly like an ideal gas
d. at high pressure and high temperature.
b. at low pressure and high temperature.
a. at high pressure and low temperature.
c. at low pressure and low temperature.
3
How many moles of NaOH are required to neutralize 2.4 mol H
2
SO
4
?
3.6 mol
4.8 mol
1.2 mol
2.4 mol
4
Radon-222 has a half-life of 3.8 days. How much of an initial 20.0g sample of Radon-222 remains after 15.2 days?
5.00g
2.50g
12.5g
1.25g
5
Can chloroform be heated to 90°C in an open container?
False
True
6
If a radioisotope undergoes beta emission,
the number of neutrons remains constant
the atomic number changes.
the mass number changes.
the isotope loses a proton
7
How many water molecules are tied up per formula unit of a compound that is an octahydrate?
seven
six
nine
eight
8
When a sugar cube completely dissolves in a glass of water, it forms...
an emulsion
a solution
a suspension
a colloid
9
Ail aqueous solution is 65% (v/v) rubbing alcohol. How many milliliters of water are in a 95-mL sample of this solution?
30 mL
33 mL
62 mL
1.5 mL
10
When 2.0 mol of methanol is dissolved in 45 g of water, the mole fraction of methanol is...
2.25
0.55
0.44
0.043
11
A gas in a balloon at constant pressure has a volume of 120.0 mL at -123°C. What is its volume at 27.0°C?
60.0 mL
546.0 mL
240.0 mL
26.5 mL
12
Identify the spectator ion in this reaction. Ba(OH)
2
(aq) + H
2
SO
4
(aq) → BaSO
4
(s) + H
2
O(l)
Ba2+
SO4 2-
There is no spectator ion.
OH_
13
The standard heat of formation of a free element in its standard state is always
zero
higher for solids than gasses.
negative
positive
14
What is the normal boiling point of ethanol?
about 23°C
about 0°C
about 58°C
about 78°C
15
How much heat, in kilojoules, must be added to 178 g of water to increase the temperature of the water by 5.0°C ?
3.7 kJ
890 kJ
36 kJ
0.093 kJ
16
3NO
2
(g) + H
2
O(l) → NO(g) + 2HNO
3
(aq). How many moles of water are needed to react with 8.4 mol NO
2
?
8.4 mol
25 mol
2.8 mol
3.0 mol
17
When the equation Fe
2
O
3
+ H
2
→ Fe + H
2
O is balanced using whole-number coefficients, what is the coefficient of H
2
6
1
2
3
18
P
4
(s) + 6F
2
(g) → 4PF
3
(g). How many grams of fluorine are needed to react with 6.20 g of phosphorus?
2.85g
37.2g
5.70g
11.4g
19
A catalyst lowers the activation energy for a reaction because a catalyst makes a reaction more exothermic.
True
False
