Flashcard Thermochemistry Intro (2024-2025)

Front

What is thermochemistry?

Back

The study of heat changes that accompany chemical reactions and phase changes.

Front

What happens to the temperature of the surroundings during an endothermic reaction?

Back

The surroundings feel cold because heat is absorbed from them.

Front

What is an endothermic reaction?

Back

A chemical reaction that absorbs energy from its surroundings.

Front

What is an exothermic reaction?

Back

A chemical reaction that releases energy to its surroundings.

Front

How does heat flow between objects?

Back

Heat flows from warmer objects to cooler objects.

Front

What is specific heat?

Back

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

Front

If the specific heat of water is 4.18 J/g∙°C, how much heat is required to raise the temperature of 1200 g of water from 23.00 °C to 39.00 °C?

Back

80,260 J (endothermic).

Front

What is the formula to calculate heat (q)?

Back

q = mass (m) × specific heat (c) × change in temperature (ΔT).

Front

What is ΔT in thermochemistry?

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The change in temperature, calculated as final temperature minus initial temperature.

Front

What is the significance of the sign of q in thermochemistry?

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A positive q indicates an endothermic process, while a negative q indicates an exothermic process.