Which reaction "takes in enery" from the surroundings?

Is heat given in or out in EXOTHERMIC reactions?

What is COMBUSTION an example of?

Are reversible reactions exothermic or endothermic?

What is an example of how an exothermic reaction is used in everyday life?

What is an example of an everyday use of an endothermic reaction?

What is energy transfer in reactions?

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