Heat Reactions: Melting and Burning

What is the process called when materials reach a certain temperature and their molecules react with oxygen?

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Remember

At what Celsius temperature does wood begin to break down during combustion?

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Understand

Why does the fire go out after you stop adding new logs?

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Analyze

What determines whether a material will burn or melt when exposed to heat?

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Analyze

Why does chocolate melt while wood burns in a campfire?

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Analyze

What happens on the molecular scale when marshmallows melt?

• Energy is added and the freedom of movement increases.

• Energy is removed and the freedom of movement decreases.

• Energy is added and the freedom of movement decreases.

• Energy is removed and the freedom of movement increases.

What happens at the molecular scale when melted chocolate returns to a solid?

• Energy is added and the freedom of movement increases.

• Energy is added and the freedom of movement decreases.

• Energy is removed and the freedom of movement increases.

• Energy is removed and the freedom of movement decreases.