Chemistry Semester 1 Final

The measurement, 0.034050 cm, has how many significant digits?
3
4
5
6
7
Perform the following using the rules for significant figures: 30.55 + 2.7 =
33
33.2
33.3
33.25
33.2500
Perform the following calculation using the rules for significant figures: 3.050 X 150 = ?
500
460
458
547.5
547.50
If you wish to calculate the number of miles in two inches, what would be wrong with calculation:

1 foot does not equal 12 inches.
1 mile does not equal 5280 feet.
The second fraction is upside down.
The third fraction is upside down.
The calculation is correct.
What is the best name for FeCl₃?
Iron Trichloride
Iron Chloride
Iron (III) Chloride
Iron (III) Trichloride
Ferric Trichloride
What is the molecular weight of Cu(NO₃)₂?
93.5 g/mol
125.5 g/mol
173.5 g/mol
187.5 g/mol
251 g/mol
How many moles are there in 10.0 g of water?
0.555 mol
1.8 mol
10. mol
28 mol
180 mol
How many atoms are in 0.05 mol of Al?
8 x 10 ^-26
3 x 10 ²²
8 x 10 ²³
1 x 10 ²¹
3 x 10 ²³
What would be the mass of one helium atom?
4 g
7 x 10 ^-24 g
2 x 10 ²⁴ g
4 x 10 ^-25 g
1.5 x 10 ²³ g
The mass of a container of oxygen gas (O₂) has a mass of 2.00 g. An equally sized container at the same temperature and pressure would contain how many grams of carbon dioxide (CO₂)?
0.364 g
1.45 g
0.688 g
2.75 g
5.50 g
The reaction N₂ + 3 H₂ 2 NH₃ cannot be interpretted as:
1 molecule of N₂ reacts with 3 molecules of H₂ to produce 2 molecules of NH₃.
1 mole of N₂ reacts with 3 moles of H₂ to produce 2 moles of NH₃.
1 liter of N₂ gas reacts with 3 liters of H₂ gas to produce 2 liters of NH₃ gas.
2 atoms of N react with 6 atoms of H to produce 2 atoms of N and 6 atoms of H.
1 gram N₂ reacts with 3 grams of H₂ to produce 2 grams of NH3.
What coefficients (listed in order) should be used to balance the following reaction?
___ C₂H₆ + ___ O₂ ___ CO₂ + ___ H₂O
1, 3, 2, 3
1, 3.5, 2, 3
2, 7, 2, 6
2, 7, 6, 4
1, 3, 3, 3
In the reaction, N₂ + 3 H₂ 2 NH₃, 1.0 mole of N₂ could produce how many grams of NH₃?
2
8.5
17
34
None of these.
In the reaction, N₂ + 3 H₂ 2 NH₃, 5.0 g of N₂ could produce how many grams of NH₃?
0.011
2.1
3.0
12
None of these.
In the reaction, N₂ + 3 H₂ 2 NH₃, 2 grams of H₂ of could produce how many molecules of NH₃?
4 x 10 ²³
9 x 10 ²³
2 x 10 ²⁴
1 x 10 ²³
None of these.
In the reaction, N₂ + 3 H₂ 2 NH₃, how many moles of NH₃ could be formed when 2.0 moles of N₂ reacted with 2 moles of H_2?
2.0
1.3
2.3
4.0
None of these.
Standard Temperature and Pressure (STP) refers to which of the following conditions:
Temp = 0 K; Press = 760 atm
Temp = 0 ^oC; Press = 760 atm
Temp = 273 K; Press = 1 atm
Temp = 273 ^oC; Press = 1 atm
STP conditions are NOT listed above
Of the following, which would NOT increase the volume of a balloon full of air.
Increase the temperature of the air inside the balloon.
Increase the amount of air inside the balloon.
Replace the air inside the balloon with the same number of molecules of a higher molecular weight gas.
Decrease the atmospheric pressure outside the balloon.
Increase the speeds of the molecules inside the balloon.
If pressure were plotted on the "Y" axis and volume were plotted on the "X" axis, which graph would properly illustrate the relationship between the pressure and volume of a gas?
A 2.0 L sample of a gas at 25 ^oC had its temperature increased to 50 ^oC. What would be the new volume of the gas? (Remember V₁P₁/T₁ = V₂P₂/T₂.)
40.0 L
0.25 L
48,000 L
0.000021 L
2.2 L
How many liters of a gas are present at STP in a sample which occupies 2.05 liters at 3.0 atm pressure and 27 ^oC? (Remember V₁P₁/T₁ = V₂P₂/T₂.)
0.23
5.6
6.8
5.0 x 10⁵
1.3
In the reaction, N₂ + 3 H₂ 2 NH₃, 2.00 liters of N₂ at STP would require how many grams of H₂ to react completely? (At STP 1 mole of a gas = 22.4 L)
0.536 g
0.0595 g
0.268 g
269 g
29.9 g
The graph at right illustrates shows the distributions of speeds of a gas sample at two different temperatures. Which of the following is a correct interpretation of the graph:
B has more molecules than A
The average molecular speed of A is greater than B.
The average molecular speed of B is greater than A.
Both A and B are correct.
Both A and C are correct.
The graph at right shows a solid warmed until it changes to a gas. During what section(s) is a liquid present?
Section B
Section C
Section D
Sections B, C, and D
None of the above.
Use the graph in question 24 to indicate the section(s) where the kinetic energy of the molecules is increasing.
Section C
Section D
Sections B and D
Sections A, C, and E
None of the above.
What would you use to calculate energy changes in section C of the graph in question 24?
The heat of fusion of the substance.
The specific heat of the substance.
The heat of vaporization of the substance.
The heat of reaction of the substance.
None of the above.
If it requires 100. calories to increase the temperature of 5.00 g of a substance 15.0 ^oC, what is the specific heat of the substance?
7500 cal / (g ^oC)
300 cal / (g ^oC)
33.3 cal / (g ^oC)
0.750 cal / (g ^oC)
None of the above.
How much energy would it require to completely melt 25.0 g of ice at 0 ^oC? (The heat of fusion of water is 1.44 Kcal/mol.)
36.0 Kcal
2.00 Kcal
648 Kcal
313 Kcal
None of the above.
The graph at right indicates the vapor pressure of different substances as the temperature increases. What is the normal boiling point of chloroform?
20 ^oC
40 ^oC
60 ^oC
80 ^oC
None of the above.
Use the graph in question 29 to decide at what temperature water would boil if atmospheric pressure was 40 KPa.
100 ^oC
10 ^oC
73 ^oC
35 ^oC
None of the above.
Which of the substances in the graph in question 29 would have the lowest heat of vaporization?
Chloroform
Ethanol
Water
Ethanoic Acid
It is impossible to tell.
As more solute is added to a solution, the boiling point tends to _____.
increase
decrease
remain unchanged
It is impossible to predict.
If 10.0 g of NaCl are dissolved in enough water to make 250. mL of solution, what is the molarity of the solution?
0.000584 M
0.684 M
0.0437 M
2340 M
0.00684 M
In the reaction, CaCO₃ + HCl CO₂ + CaCl₂ + H₂O, 25 mL of 2.0 M HCl would react with how many grams of CaCO3? (Hint: Do not forget to balance the reaction.)
10. g
5.0 g
25 g
2.5 g
None of the above.
The graph at right shows the solubility of a solid when dissolved in 100 g of water to make a solution. How much solid would have to be dissolved in 100 g of water to make a saturated solution at 60 ^oC?
80 g
25 g
120 g
90 g
It is impossible to tell.
Use the graph in question 35 to determine how many grams of the solute would remain at the bottom a beaker if you attempted to dissolve 40 g of the solute in 100 g of water at 20 ^oC.
All 40 grams would dissolve.
About 5 grams of solute would remain at the bottom of the beaker.
About 10 grams of solute would remain at the bottom of the beaker.
About 23 grams of solute would remain at the bottom of the beaker.
About 30 grams of solute would remain at the bottom of the beaker.
Use your table of solubilities to decide which of the substances below is soluble:
Ca₃(PO₄)₂
AgCH₃COO
PbSO₄
BaCrO₄
None of the above are soluble.
Which of the dissolution reactions below is correct?
NaHCO₃ Na⁺ + HCO₃^-
K₂SO₄ K₂⁺² + SO₄^2-
HNO₃ H^- + NO₃⁺
Ca(NO₃)₂ Ca²⁺ + (NO₃^-)₂
None of the above are correct.
Which of the following shows a correct ionic equation? (Use your table of solubilities.)
Pb²⁺ + 2 NO₃^- + 2 K⁺ + SO₄^2- PBK₂ (s) + 2 NO₃^- + SO₄^2-
Pb²⁺ + 2 NO₃^- + 2 K⁺ + SO₄^2- PbSO₄ (s) + 2 K⁺ + 2 NO₃^-
Pb²⁺ + 2 NO₃^- + 2 K⁺ + SO₄^2- (NO₃)₂SO₄ (s) + Pb²⁺ + 2 K⁺
Pb²⁺ + 2 NO₃^- + 2 K⁺ + SO₄^2- 2 KNO₃ (s) + Pb²⁺ + SO₄^2-
None of these is correct.
Use the periodic table to predict which of the following compounds is possible:
NaNe
CaI₃
AlO₂
K₂S
None of the above are correct.
Which of the following statements about the horizontal rows of the elements in the periodic table is TRUE?
From left to right the atomic numbers tend decrease.
From left to right the atomic masses tend to decrease.
From left to right the atomic radii tend to decrease.
From left to right the ionization energies tend to decrease.
None of the above are correct.
The properties of what element are described in the following sentences?

1. It is a gas at room temperature.
2. It forms a diatomic molecule.
3. It forms a +1 ion.
Br
Li
H
Xe
Cl
The properties of what element are described in the following sentences?

1. It reacts with Hydrogen in a 1:1 ratio.
2. It is a liquid at room temperature.
3. It forms a -1 ion.
Br
Li
H
Xe
Cl
Using the periodic table, pick the pair of atoms that would most likely form a molecular compound.
H and Cl
Li and Br
Na and O
He and Ne
Cl and Cl
Which one of the following statements about elements in the first column of the periodic table is TRUE?
These elements are called halogens.
These elements have the smallest atoms in their period.
These elements have the smallest ionizations energies in thier period.
These elements are not very reactive with water.
None of these statements are true.

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