When a reaction occurs, what happens to the energy?

energy is always released by chemical reactions.
energy is always taken in by chemical reactions.
energy can be taken in or released by chemical reactions.
energy is not taken in or released by chemical reactions.

Select the correct answer. which phrase correctly describes temperature? o a. average rotational kinetic energy of the particles in an object o b. average energy of the particles in an object c. average translational kinetic energy of the particles in an object od. all energy possessed by the particles in an object

Can someone me with 1 to 4 plz. fast

Match the name of the following compound:   mgso4  · h2omagnesium sulfate monohydratemagnesium (ii) sulfate monohydratemagnesium (ii) sulfate hydratemagnesium sulfate hydrate