Free Cambridge Lower Secondary Checkpoint Science Practice: Chemistry III: Changes to Materials (Reactions and Energy Ideas)

Checkpoint Science: Chemistry III: Changes to Materials

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Charles adds marble chips (calcium carbonate) to hydrochloric acid in two flasks on balances. Flask A is left open. Flask B has a balloon fixed over its neck. The diagram shows the readings when the reaction has finished.

Which statement explains both results?

Select one option.

Atoms are destroyed in flask A but not in flask B.
Mass is changed into energy in flask A, but the balloon stops this happening in flask B.
Water evaporates from flask A, but not from flask B.
In both flasks the total mass of the products equals the total mass of the reactants, but in flask A the carbon dioxide gas escapes into the air.
The marble chips become lighter as they dissolve, but only in flask A.

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