Introduction to Thermochemistry

What unit do you use to measure Thermal Energy?

• J/Kg ºC

• Kg

• ºC

• J

Which will substance will cool down the fastest if they have equal mass and starting temperature?

• copper

• granite

• iron

• basalt

Answer explanation

The LOWER the heat capacity, the faster it will heat up or cool down given the same mass and same starting temperature (it doesn't hold heat as well or is more of a CONDUCTOR than insulator)

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NGSS.MS-PS1-4

NGSS.MS-PS3-4

The amount of heat that raises the temperature of 1 g of pure water 1°C

• energy

• calorie

• heat capacity

• exothermic process

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NGSS.MS-PS3-3

The capacity to do work or to supply heat

• heat capacity

• specific heat

• enthalpy

• energy

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NGSS.MS-PS3-3

NGSS.MS-PS3-4

NGSS.MS-PS3-5

A process that loses heat to the surroundings

• energy

• heat capacity

• law of conservation of energy

• exothermic process

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NGSS.HS-PS3-4

the amount of heat required to raise the temperature of 1 gram of a substance 1°C

• heat

• specific heat

• calorie

• energy

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NGSS.MS-PS3-4

The mass of a sample is 12g. There’s a temperature change from 20°C to 35°C when it absorbed 500 J of heat. What is the specific heat of this sample?

• 8.67 J/g•°C

• 2.78 J/g•°C

• 1.23 J/g•°C

• 108.67 J/g•°C

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NGSS.MS-PS3-4

NGSS.MS-PS3-5

How much heat must be added to a 9.81 g sample of gold to increase its temperature by 6.5°C? The specific heat of gold is 0.13J/g•°C

• 160.512 Joules

• 8.289 Joules

• 185.142 Joules

• 185,142 Joules

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NGSS.HS-PS3-4

How many grams of water are needed to raise the temperature by 17°C, and using 350 J of energy?

• 4.62 grams

• 4.92 grams

• 4.58 grams

• 5.01 grams

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NGSS.MS-PS1-4

NGSS.MS-PS3-4

How many grams of Aluminum are needed to raise the temperature by 12°C, and using 50 J of energy? Specific heat of Aluminum is 0.902 J/g•°C

• 4.62 grams

• 4.58 grams

• 4.92 grams

• 5.01 grams