Thermochemistry

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What is Thermochemistry?

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Thermochemistry is the branch of chemistry that deals with the heat energy associated with chemical reactions and changes of state.

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NGSS.HS-PS1-4

NGSS.HS-PS1-5

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What does \( \Delta T \) represent in thermochemistry?

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\( \Delta T \) represents the change in temperature, calculated as the final temperature minus the initial temperature.

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NGSS.HS-PS1-5

NGSS.HS-PS3-4

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Calculate \( \Delta T \) when a substance goes from 10°C to 75°C.

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\( \Delta T = 75°C - 10°C = 65°C \)

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NGSS.MS-PS1-4

NGSS.MS-PS3-4

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What does 'c' stand for in thermochemistry?

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'c' stands for specific heat, which is the amount of heat required to raise the temperature of 1 gram of a substance by 1°C, measured in J/g°C.

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NGSS.HS-PS3-4

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When two samples of similar mass are subjected to the same heat energy, which sample will have a larger temperature change?

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The sample with the smaller specific heat will have a larger temperature change.

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NGSS.MS-PS3-4

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What does 'q' represent in thermochemistry?

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'q' represents the amount of heat energy absorbed or released during a process, measured in Joules.

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NGSS.HS-PS1-4

NGSS.HS-PS1-5

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What is an endothermic reaction?

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An endothermic reaction is a chemical reaction that absorbs heat from its surroundings.

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NGSS.HS-PS1-4

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What is an exothermic reaction?

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An exothermic reaction is a chemical reaction that releases heat to its surroundings.

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NGSS.HS-PS1-4

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How do you calculate heat (q) using specific heat (c)?

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The formula is \( q = mc\Delta T \), where m is mass, c is specific heat, and \( \Delta T \) is the change in temperature.

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What is the specific heat of water?

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The specific heat of water is approximately 4.18 J/g°C.

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NGSS.HS-PS3-4