Mass Changes when a Reactant or Product is a Gas (AQA GCSE Chemistry): Flashcards

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Mass Changes when a Reactant or Product is a Gas
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Why mass appears to change in some reactions

Gas escapes or enters the container

What happens to gases in open containers

Can escape or enter

Products when heating CaCO3CaCO₃

CaOCaO and CO2CO₂

Why mass decreases when heating CaCO3CaCO₃ in open container

CO2CO₂ gas escapes

Decomposition equation for calcium carbonate

CaCO3CaCO₃CaOCaO + CO2CO₂

What happens when FeFe exposed to air

Reacts with O2O₂ to form iron oxide (rust)

Product when FeFe reacts with O2O₂

Iron oxide (rust)

Why FeFe gains mass when rusting

Oxygen from air combines with it

Cause of apparent mass loss

Gas product escapes container

Cause of apparent mass gain

Gas reactant enters from surroundings

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