9.5 More about conservation of mass
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Chemistry
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7th Grade
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Easy
Otgonkhuu Ragchaasuren
Used 19+ times
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6 Slides • 9 Questions
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9.5 More about conservation of mass
Grade 7
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Not what you expect
When you add calcium carbonate to hydrochloric acid, there is a
chemical reaction.
The word equation for this reaction is:
calcium carbonate + hydrochloric acid → calcium chloride + water + carbon dioxide
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Not what you expect
The carbon dioxide gas escapes into the air because the flask is open.
You then cannot measure its mass. So it appears as if the mass decreases as the
reaction continues.
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Open Ended
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Open Ended
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Open Ended
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Open Ended
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Another surprising result
A French scientist called Antoine Lavoisier carried out this experiment in 1772.
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Another surprising result
Magnesium + oxygen => magnesium oxide
There is an increase in mass because oxygen from the air has combined with magnesium.
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Multiple Choice
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Multiple Choice
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Multiple Choice
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Multiple Choice
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Multiple Choice
9.5 More about conservation of mass
Grade 7
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