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WorksheetsChemDay1
Total questions: 18
Worksheet time: 2hrs 30mins
Name
Class
Date
1.
A 3L vessel contains 2.5 moles of an ideal gas at STP. If the temperature were increased to 409.5K and the size of the vessel was decreased to 1L, what would be the new pressure exerted on the vessel walls by the ideal gas?
a)
3.0 atm
b)
4.0 atm
c)
4.5 atm
d)
5.5 atm
2.
The volume within a cylinder increases as the pump handle is lifted as shown. If the temperature remains the same, what happens to the pressure inside the cylinder? (9A)
a)
The pressure increases by a factor of 3.
b)
The pressure decreases by a factor of 3.
c)
The pressure remains the same.
d)
The pressure becomes zero.
3.
Kelly is tasked with writing out the postulates of the kinetic molecular theory. Her answers are below. (9C)
I. The molecules of an ideal gas have a finite volume.
II. The molecules of an ideal gas collide. Their collisions are elastic, meaning kinetic energy is conserved.
III. The molecules of an ideal gas move randomly
IV. The molecules of an ideal gas attract and repel each other.
I. The molecules of an ideal gas have a finite volume.
II. The molecules of an ideal gas collide. Their collisions are elastic, meaning kinetic energy is conserved.
III. The molecules of an ideal gas move randomly
IV. The molecules of an ideal gas attract and repel each other.
a)
I only
b)
II and III
c)
I, II, and III
d)
I, II, III and IV
4.
Water is important to the human body because it allows metabolic processes to occur. What property of water best accounts for allowing these processes?
a)
High boiling point
b)
High surface tension
c)
Polarity
d)
Density
5.
Which mixtures would be insoluble in water?
a)
BaSO4 and Li2SO4
b)
LiC2H3O2 and Mg(C2H3O2)2
c)
NaClO2 and KClO2
d)
(NH4)2CO3 and (NH4)2CO3
6.
Which of the following properties of a substance most affects whether it will dissolve in water?
a)
Its polarity
b)
Its boiling point
c)
Its molecular mass
d)
Its surface tension
7.
How many moles of NaCl are needed make 2.0 liters of a 1.5 M solution of NaCl?
a)
1.5
b)
2
c)
3.0
d)
4.75
8.
What volume of 2.0 M lithium hydroxide is need to make 6.0 L of 0.1M lithium hydroxide?
a)
12 L
b)
1.2 L
c)
30 L
d)
0.3 L
9.
A solution of 140 grams of KNO3 in 100g of water begins at a temperature of 100°C and is slowly cooled. At approximately what temperature will the solution changes from unsaturated to saturated?
a)
25°C
b)
50°C
c)
72°C
d)
95°C
10.
A chemist adds 35 grams of NaCl to 100g of water at 80°C. If the water is allowed to sit in an open container in the sun, what change is most likely to occur?
a)
The water will evaporate and the molarity of the NaCl solution will increase.
b)
The water will evaporate and the molarity of the NaCl solution will decrease.
c)
The salt will evaporate and the molarity of the NaCl solution will increase.
d)
The salt will evaporate and the molarity of the NaCl solution will decrease.
11.
Which of the following is an electrolyte?
a)
HCl
b)
CCl4
c)
CO2
d)
SO2
12.
Four friends in chemistry class are competing to see whose procedure will dissolve a sugar cube the fastest. List the student’s procedures from slowest to dissolve to fastest to dissolve.
a)
Cal, Rubi, Neo, Xena
b)
Rubi, Cal, Xena, Neo
c)
Xena, Neo, Rubi, Cal
d)
Rubi, Neo, Xena, Cal
13.
Which reactant acts as the Bronsted-Lowry base?
NH3+CH3COOH <-> NH4++CH3COO-
NH3+CH3COOH <-> NH4++CH3COO-
a)
NH3
b)
CH3COOH
c)
NH4+
d)
CH3COO-
14.
Which of the following properties describe(s) Arrhenius acids?
a)
They release hydroxide ions
b)
They release hydrogen ions
c)
They accept protons
d)
Both B and C
15.
What type of reaction is shown in the equation below?
HCl + LiOH -> LiCl + H2O
HCl + LiOH -> LiCl + H2O
a)
Acid-base
b)
Oxidation-reduction
c)
Precipitation
d)
Combustion
16.
Which of the following properties describes a neutralization reaction?
a)
Occurs between strong acids and strong bases
b)
Produces water
c)
Results in a precipitant
d)
Both A and B
17.
A solution has a hydroxide concentration of 1x10-8 M. What is the pH of this solution?
a)
6
b)
-6
c)
8
d)
-8
18.
Why is hydrobromic acid (HBr) considered a strong acid?
a)
It completely dissociates to produce hydronium ions
b)
It completely dissociates into hydroxide ions
c)
It does not dissociate fully into an aqueous solution
d)
It produces a pH above 7
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