Calorimetry

Question 1

Which statement best describes why specific heat capacity is often more useful than heat capacity for scientists when comparing two materials?

Revolt · Accepted Answer

Specific heat capacity is an intensive property and does not depend on sample size.

Question 2

Loren has the samples of elements that are listed below at room temperature. He exposes the samples to the same heat source until each sample reaches a temperature of 90.0°C. 10 g of Al(s) ( = 0.897 J/(gi°C))10 g of Ag(s) (= 0.234 J/gi°C )10 g of Fe(s) ( = 0.450 J/gi°C)10 g of Zn(s) ( = 0.387 J/gi°C )From first to last, which lists the order in which these samples will reach 90.0°C?

Revolt · Accepted Answer

Ag, Zn, Fe, Al

Question 3

When 40.0 mL of 1.00 M H2SO4 is added to 80.0 mL of 1.00 M NaOH at 20.00°C in a coffee cup calorimeter, the temperature of the aqueous solution increases to 29.20°C. If the mass of the solution is 120.0 g and the specific heat of the calorimeter and solution is 4.184 J/g • °C, how much heat is given off in the reaction? (Ignore the mass of the calorimeter in the calculation.)Use .

Revolt · Accepted Answer

4.62 kJ

Question 4

What is the specific heat of a substance if a mass of 10.0 kg increases in temperature from 10.0°C to 70.0°C when 2,520 J of heat is applied?Use .

Revolt · Accepted Answer

0.00420 J/(gi°C)

Question 5

The heat capacity of a sample should be divided by which quantity to find the specific heat capacity?

Revolt · Accepted Answer

mass in grams

Question 6

Which statement defines calorimeter?

Revolt · Accepted Answer

a device that measures the heat that is gained or lost in a chemical change

Question 7

A sample of an unknown substance has a mass of 0.465 kg. If 3,000.0 J of heat is required to heat the substance from 50.0°C to 100.0°C, what is the specific heat of the substance?Use .

Revolt · Accepted Answer

0.129 J/(gi°C)

Question 8

Complete combustion of a 0.600-g sample of a compound in a bomb calorimeter releases 24.0 kJ of heat. The bomb calorimeter has a mass of 1.30 kg and a specific heat of 3.41 J/(gi°C). If the initial temperature of the calorimeter is 25.5°C, what is its final temperature?Use .

Revolt · Accepted Answer

30.9°C

Question 9

Which statement describes how a basic coffee cup calorimeter works?

Revolt · Accepted Answer

It uses the mass and specific heat of water along with a thermometer to measure the gain or loss of energy when a substance is added.

Question 10

A sample of hexane (C6H14) has a mass of 0.580 g. The sample is burned in a bomb calorimeter that has a mass of 1.900 kg and a specific heat of 3.21 J/giK. What amount of heat is produced during the combustion of hexane if the temperature of the calorimeter increases by 4.542 K?Use .

Revolt · Accepted Answer

27.7 kJ

Calorimetry Answers

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