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If a substance of unknown composition is heated in an open container will Its mass will stay the same as a result the mass of the container and its contents decreases. A substance of an unknown composition is heated in a sealed container the mass of the container and its content remains the same.

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Wiki User

9y ago
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Wiki User

14y ago

I think the answer is yes because I just think it is.OKAY!Gosh don't judje my life!

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Wiki User

11y ago

The mass remain constant: this is the law of mass conservatin.

Notes: avoided reactions between the container and the substance, also explosions.

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Anonymous

Lvl 1
3y ago

decreases

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Q: What happens if a substance of unknown composition is heated in a sealed container As a result the mass of the container and its contents?
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