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A physical change is when something reacts with water to form a gas. For example, when magnesium reacts with water vapor, it will form hydrogen gas and magnesium hydroxide.

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10y ago
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6mo ago

One example of a substance that reacts with water to form a gas is sodium metal. When sodium reacts with water, it produces hydrogen gas and sodium hydroxide. This is a highly exothermic reaction that can be dangerous if not conducted properly.

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Q: What reacts with water to form a gas?
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Is reacts with water to form a gas physical or chemical?

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