Chemical reactions

Front

In an endothermic reaction, heat is ...

Back

taken in or absorbed

Front

Baking bread and cooking an egg are examples of...?

Back

Endothermic processes

Front

Exothermic reactions...

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Release energy

Front

When does a chemical reaction stop?

Back

When the limiting reactant is used up

Front

What is essential for a combustion reaction to begin?

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Fuel, oxygen and heat

Front

Which of the following shows the correct way to balance the chemical equation?
Fe + O₂ -> Fe₂O₃
Options: 4Fe + 3O₂ -> 2Fe₂O₃, 2 Fe + 3O₂ -> Fe₂O₆, 4 Fe + O₆ -> 2Fe₂O₃, None of the options are correctly balanced.

Back

4Fe + 3O₂ -> 2Fe₂O₃

Front

Balance this equation:
HgO --> Hg + O₂

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2HgO --> 2Hg + O₂

Front

Ice melting: Chemical Change or Physical Change?

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Physical Change

Front

What happens in ALL chemical changes?

Back

A new substance is formed

Front

Is the equation Fe + S --> FeS balanced or unbalanced?

Back

balanced