Heat (calorimetry) Calculations

In this Equation "q" stands for

• Mass in grams

• energy in joules

• temperature in celsius

• energy in kJ

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NGSS.HS-PS3-4

NGSS.HS-PS3-1

For the formula:

Q= m c ∆T

The units for specific heat are:

• g /J C

• J/g K

• kJ/g

• J/g°C

What would be the effect on the particles if more heat is supplied to the system?

• They would slow down
• They would stop moving
• They would speed up
• There would be no effect

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NGSS.HS-PS3-4

NGSS.HS-PS1-5

If two objects have different temperatures when they come in contact, heat will flow from the warmer object to the cooler one UNTIL ____________

• one reaches a temperature of zero

• they both have an equal temperature

• one runs out of energy

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NGSS.HS-PS3-4

If the specific heat of water is 4.18 J/g∙°C, how much heat is required to increase the temperature of 1.2 kg of water from 23 °C to 39 °C?

• -80,256 J

• 80.256 J

• 80,256 J

• -80.256 J

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NGSS.HS-PS3-4

What is the specific heat of an unknown substance if 100.0 g of it at an initial temperature of 200.0 °C reaches a final temperature of 27.1 °C. The amount of energy released during this process is 2230 J.

• -0.129 J/g°C

• 1.29 J/g°C

• 0.129 J/g°C

• 22225.85 J

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NGSS.HS-PS3-4

NGSS.HS-PS3-1

For a skillet, used for cooking, do you want a high or low specific heat

• High, so that it will need more energy to heat up

• Low, so that it will change temperature quickly

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NGSS.MS-PS3-4

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The unit of heat and energy is the __________.

• calorie

• heat

• joule

• kilojoule

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NGSS.HS-PS3-4

A sample of iron receives 50 J of heat energy that raises the temperature of the iron by 25.0°C. If iron has a specific heat of 0.10 J/g°C, what is the mass of the iron sample?

• 25g

• 30g

• 20g

• 50g

A piece of zinc with a mass of 32.8 g has an initial temperature of 100.5°C. What is the final temperature of the zinc if 2232 J of thermal energy is added?

• 174.5 °C

• 174.5 K

• 275 °C

• 275 K

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NGSS.HS-PS3-4