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my explanation

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The mass will stay the same.

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The mass will be the same but re-distributed, like explode

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Mass cannot be created or destroyed ?

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The mass will decrease and gas is not lighter

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It will stay the same, even if the weight changes.

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Mass doesn’t change between states

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The mass will be the same if the gas stays in the balloon

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The mass will be the same if the gas stays in the balloon

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The reaction will produce gas and be lost.

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Baking soda reacts with water to form a gas

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Mass conservation

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Gas formed. Balloon blows up