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Calorimetry Answers

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Which statement describes how a basic coffee cup calorimeter works?

It measures the mass of a substance given the specific heat and temperature of water in a cup of known size.

It measures the density of a substance given the mass, specific heat, and temperature of water in a cup of known size.

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

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.

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Which units express specific heat capacity?

J/°C, J/K, cal/°C, cal/K

J/(gi°C), J/(giK), cal/(gi°C), cal/(giK)

J, cal

°C, K

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?

Al, Fe, Zn, Ag

Ag, Zn, Fe, Al

Al, Fe, Ag, Zn

Ag, Al, Zn, Fe

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

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

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

Specific heat capacity is an intensive property and depends on the sample size.

Specific heat capacity is an extensive property and depends on the sample size.

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

temperature in degrees Celsius

temperature in kelvins

volume in liters

mass in grams

What would be the greatest difference in using an open ceramic coffee mug rather than an insulated mug with a lid as a calorimeter?

increased evaporation of the water

loss of gaseous reactants

inability to contain liquids

exchange of energy with the surroundings

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 .

0.00775 J/(gi°C)

0.0600 J/(gi°C)

0.129 J/(gi°C)

0.155 J/(gi°C)

Which units express heat capacity?

J/°C, J/K, cal/°C, cal/K

J/(gi°C), J/(giK), cal/(gi°C), cal/(giK)

J, cal

°C, K

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 .

30.9°C

34.5°C

44.0°C

51.5°C

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 .

0.00420 J/(gi°C)

0.00661 J/(gi°C)

238 J/(gi°C)

252 J/(gi°C)

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