CHEM 120 FINAL EXAM 4
1. A 65.0-g piece of copper metal at 59.0 °C is cooled down to 25.5 °C when
placed in water. Assuming the specific heat of copper is 0.385 J/g°C, what is the
amount of heat in calories lost by the copper? SHOW ALL WORK
Answer: - 200.233cal
2. A nurse practitioner orders Medrol to be given 1.1 mg/kg of body weight.
Medrol is an anti-inflammatory administered as an intramuscular injection. If achild
weighs 65.8 lb and the available stock of Medrol is 20. mg/mL, how manyounces
does the nurse administer to the child? (1 kg = 2.20 lb, 1 oz = 28.57 mL)
Answer: 0.057oz
3. Exam 2- One mole of copper(II) sulfate, CuSO4, contains Oatoms.
Answer: 2.41 x 10^24
4. When the following equation is balanced, the coefficient of O2 is .CH4 +
O2 ’ CO2 + H2O
Answer: 2
5. In the following reaction, what is the substance oxidized? Zn + 2 HCl ’ ZnCl2
+ H2
Answer: Zn
6. The number of moles of MgO produced when 6.4g of O2 reacts completelyin the
following reaction is
Answer: 0.4mol
7. The following reaction is an example of a
reaction?: Na2SO4(aq) + 2AgNO3(aq) ’ Ag2SO4(s) + 2NaNO3(aq)
Answer: Double Replacement
8. If the volume of a gas increases from 12L to 24L at a constant temperature,what
will happen to the pressure of the gas?
Answer: Halve the pressure
, 9. A gas sample has a volume of 0.300 L with an unknown temperature. Thesame
gas has a volume of 0.210 L when the temperature is 29C, with no change in the
pressure or amount of gas. What is the initial temperature in Celsius?
Answer: 158C
10. How many moles of neon occupy a volume of 14.3 L at STP?
Answer: 0.638 mol
11. For a deep dive, a scuba diver uses a mixture of helium and oxygen witha
pressure of 8.00 atm. If the oxygen has a partial pressure of 1280 mmHg, what is
the partial pressure of the helium? (Volume and temperature are constant.)
Answer: 4800 mmHg
12. The pressure of a gas increases as the temperature of that gas is increased at a
constant number of moles and a constant volume. This is a description of which gas
law?
Answer: Gay-Lussac's Law
13. Which of the following compounds will be a strong electrolyte?
Answer: NaOH
14. The solubility of KI is 50 g in 100 g of H2O at 20 °C. If 110 grams of KI are
added to 200 grams of H2O, .
Answer: Saturated
15. What is the molarity of a solution that contains 17 g of NH3 in 0.50 L of
solution?
Answer: 2.0 M
16. If 450. mL of 6.00 M KBr solution is diluted to 1.80 L, the concentration ofthe
KBr solution is M.
Answer: 1.50 M
17. In the following diagram demonstrating osmosis, with the red dashed line
representing a semipermeable membrane, which of the following will occur? (low
solute on left, High solute on right)
Answer: Water will move right
1. A 65.0-g piece of copper metal at 59.0 °C is cooled down to 25.5 °C when
placed in water. Assuming the specific heat of copper is 0.385 J/g°C, what is the
amount of heat in calories lost by the copper? SHOW ALL WORK
Answer: - 200.233cal
2. A nurse practitioner orders Medrol to be given 1.1 mg/kg of body weight.
Medrol is an anti-inflammatory administered as an intramuscular injection. If achild
weighs 65.8 lb and the available stock of Medrol is 20. mg/mL, how manyounces
does the nurse administer to the child? (1 kg = 2.20 lb, 1 oz = 28.57 mL)
Answer: 0.057oz
3. Exam 2- One mole of copper(II) sulfate, CuSO4, contains Oatoms.
Answer: 2.41 x 10^24
4. When the following equation is balanced, the coefficient of O2 is .CH4 +
O2 ’ CO2 + H2O
Answer: 2
5. In the following reaction, what is the substance oxidized? Zn + 2 HCl ’ ZnCl2
+ H2
Answer: Zn
6. The number of moles of MgO produced when 6.4g of O2 reacts completelyin the
following reaction is
Answer: 0.4mol
7. The following reaction is an example of a
reaction?: Na2SO4(aq) + 2AgNO3(aq) ’ Ag2SO4(s) + 2NaNO3(aq)
Answer: Double Replacement
8. If the volume of a gas increases from 12L to 24L at a constant temperature,what
will happen to the pressure of the gas?
Answer: Halve the pressure
, 9. A gas sample has a volume of 0.300 L with an unknown temperature. Thesame
gas has a volume of 0.210 L when the temperature is 29C, with no change in the
pressure or amount of gas. What is the initial temperature in Celsius?
Answer: 158C
10. How many moles of neon occupy a volume of 14.3 L at STP?
Answer: 0.638 mol
11. For a deep dive, a scuba diver uses a mixture of helium and oxygen witha
pressure of 8.00 atm. If the oxygen has a partial pressure of 1280 mmHg, what is
the partial pressure of the helium? (Volume and temperature are constant.)
Answer: 4800 mmHg
12. The pressure of a gas increases as the temperature of that gas is increased at a
constant number of moles and a constant volume. This is a description of which gas
law?
Answer: Gay-Lussac's Law
13. Which of the following compounds will be a strong electrolyte?
Answer: NaOH
14. The solubility of KI is 50 g in 100 g of H2O at 20 °C. If 110 grams of KI are
added to 200 grams of H2O, .
Answer: Saturated
15. What is the molarity of a solution that contains 17 g of NH3 in 0.50 L of
solution?
Answer: 2.0 M
16. If 450. mL of 6.00 M KBr solution is diluted to 1.80 L, the concentration ofthe
KBr solution is M.
Answer: 1.50 M
17. In the following diagram demonstrating osmosis, with the red dashed line
representing a semipermeable membrane, which of the following will occur? (low
solute on left, High solute on right)
Answer: Water will move right
