Four statements about reactions are listed.
1. Burning a fuel is an exothermic reaction.
2. Endothermic reactions heat up the surroundings.
3. Endothermic reactions take in energy.
4. When exothermic reactions take place the reactants gain energy.
Which statements are correct?
1 )
1 and 2
1 and 3
3 )
2 and 4
4 )
3 and 4
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