Understanding Calorimetry

What does the heat capacity of a substance indicate?

• The volume of the substance that can absorb heat

• The amount of energy needed to raise the temperature of a sample by 1°C

• The time it takes for a substance to cool down

• The temperature increase when heat is applied

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NGSS.MS-PS3-4

NGSS.MS-PS3-5

What equation relates heat exchange to specific heat?

• Heat exchange = Specific heat x Mass of substance x Temperature change

• Heat capacity = Specific heat / Temperature change

• Heat exchange = Heat capacity x Temperature change

• Specific heat = Heat exchange / (Mass of substance x Temperature change)

Tags

NGSS.HS-PS3-4

Why is a coffee cup used in calorimetry experiments?

• Coffee cups are cheap

• Because it's readily available

• It acts as a good insulator

• It can measure temperature accurately

What is the primary goal of the coffee cup calorimeter experiment?

• To measure the heat capacity of the coffee cup

• To find the boiling point of the metal

• To determine the temperature of boiling water

• To calculate the specific heat of a metal

What is the purpose of heating the metal in boiling water before the experiment?

• To increase its mass

• To make it easier to handle

• To ensure it's at a known temperature

• To clean the metal

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NGSS.MS-PS1-4

NGSS.MS-PS3-4

How do you calculate the mass of water in the coffee cup calorimeter experiment?

• By weighing the cup before and after adding water

• Using the density of water

• Equating the volume of water in milliliters to mass in grams

• Measuring the displacement of water

What does the heat absorbed by the water represent in the experiment?

• The final temperature of the metal

• The heat released by the metal

• The temperature change of the water

• The specific heat of the water

Tags

NGSS.HS-PS3-4

How can the specific heat of the metal be determined?

• By dividing the heat absorbed by the water by the mass of the metal

• Using the heat absorbed by the water and the temperature change of the metal

• Through the temperature change of the water only

• Calculating the difference in temperature between the metal and water

Tags

NGSS.HS-PS3-4

Why is specific heat important for identifying metals?

• Specific heat is related to the metal's weight

• It determines the metal's color

• It measures the metal's conductivity

• Because it's unique to each metal

A 4.82 g sample of an unknown metal is heated to 115.0°C and then placed in 35 mL of water that has a temperature of 28.7°C, which then heats up to 34.5°C.

With water having a specific heat of 4.186 J/g⋅°C, what is the heat of water absorbed by the water?

(Hint: units and sig figs)

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NGSS.HS-PS3-1

NGSS.HS-PS3-4