Week 7b Lab: Enthalpy and Specific Heat Pre-Lab Quiz
Due Oct 7 at 11:59pm Points 5
Questions 10 Available until Oct 7 at 11:59pm
Time Limit None Allowed Attempts Unlimited
Instructions
This pre-lab quiz is des
...
Week 7b Lab: Enthalpy and Specific Heat Pre-Lab Quiz
Due Oct 7 at 11:59pm Points 5
Questions 10 Available until Oct 7 at 11:59pm
Time Limit None Allowed Attempts Unlimited
Instructions
This pre-lab quiz is designed to accompany the Enthalpy and Specific Heat lab. Use the information found in Introductory Materials-Enthalpy and Specific Heat to answer the questions. The Enthalpy and Specific Heat Procedure and Post-Lab will become available after you complete this quiz with a perfect score.
You can take this quiz multiple times in order to achieve a perfect score.
DUE: WEDNESDAY, October 7, 2020 at 11:59 pm MST
TOTAL: 5 points
Attempt History
Attempt Time Score
LATEST Attempt 1 5 minutes 4 out of 5
! Correct answers are hidden.
Score for this attempt: 4 out of 5 Submitted Oct 7 at 7:51pm
This attempt took 5 minutes.
Question 1 0.5 / 0.5 pts
Which of the following statements about specific heat capacity is
true?
Specific heat capacity is the amount of heat per unit mass required to raise the temperature of a substance by one Kelvin (or degree Celcius)
CORRECT!
Incorrect
The substance with the smaller specific heat capacity requires more energy to raise its temperature by 1°C.
Specific heat capacity and heat are not inversely proportional.
Question 3 0.5 / 0.5 pts
What is used to measure the heat generated or consumed by a substance during a chemical reaction or physical change?
Calorimeter
CORRECT!
Question 4 0.5 / 0.5 pts
Which of the following is NOT a basic component of a calorimeter?
a mass scale
CORRECT! The mass of a substance to be processed in a calorimeter must be determined separately.
Incorrect
Question 6 0.5 / 0.5 pts
Which of the following assumptions must be made in a coffee-cup calorimetry experiment? Choose all correct answers.
No heat is exchanged with the surroundings outside the calorimeter.
CORRECT!
Heat will flow from the exothermic reaction or hot object into the cooler water.
CORRECT!
Question 8 0.5 / 0.5 pts
A calorimeter is used to measure the heat released in two reactions. One experiment digests (combusts) 5 g of sugar and the other digests (combusts) 5 grams of fat. After analysis, the experimenter determines that the enthalpy change of the sugar is smaller than that of the fat. Which of the following statements is true?
The reaction of the fat produced more heat.
CORRECT!
Question 9 0.5 / 0.5 pts
When 1.8 kg of water is warmed from 25 C to 95 C, how much
heat (q) is needed? Round to two significant figures.
Hint: Cs of water = 4.184
530 kJ
CORRECT!
Question 10 0.5 / 0.5 pts
A calorimeter contains 100 g of water at 39.8 C. An 8.23 g metal object (whose temperature is 50.0 C) is placed inside the calorimeter. When equilibrium has been reached, the new temperature of the water and the metal is 40.0C . What type of metal is the object made from?
Hints: (1) Cs of water = 4.184 , (2) solve for the specific heat
capacity of the unknown metal, and (3) use the table of Specific Heat Capacity of Common Substances to identify the metal.
Mg (s)
CORRECT!
The specific heat capacity for Mg is 1.02 J/g C.
Quiz Score: 4 out of 5
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