Heat and Specific Heat

Specific heat capacity

Defined as
the amount of heat energy, H,
required to raise the temperature of
a unit mass (one kilogram or one gram)
of a substance by
one degree Celsius or one Kelvin.

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Specific Heat ​

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is the amount of heat energy, ​

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,
required to raise the temperature, ​

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,of
one unit mass (one kilogram or one gram)

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degree Celsius or one ​

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.​

The math says

If some mass absorbs H joules of heat energy from a heat source and its temperature changes by:

∆T=T(final)-T(initial)

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How do you find temperature change?

​

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=​

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-​

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∆T

T(final)

T(initial)

T

H=mC∆T

When heat (H) is absorbed from the surroundings then your H will be positive (+).
This is an endothermic reaction.

Heat Transfer During a Reaction

When HEAT (H) is released from the system to the surroundings then your H will be negative (-). This is and exothermic reaction.

Multiple Choice

When HEAT (H) is released from the system to the surroundings

then your H will be negative (-).

What type of reaction is this?

• Endothermic

• Exothermic

• Equalibrium

Math Response

The temperature of a sample of iron with a mass of 11.0 g changed from 50.4°C to 25.0°C with the release of 47 calories of heat. What is the specific heat of iron?

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Correct Answer: 0.168

Deg^°

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Math Response

To one kilogram of water, 3785 J thermal energy is added so that its temperature raises by one Kelvin.

Find the specific heat capacity of water?

Hint units are: J/(kg*K)

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Correct Answer: 3785

Deg^°

Rad

Math Response

Challenge Q:

120.5g block of silver initially at 20.0˚C absorbs 678J of heat. If the specific heat capacity of silver is 0.240J/g˚C, in degrees Celsius, what is the final temperature of the block of silver?

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Correct Answer: 254.4

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