Energy changes in Chemistry

Energy can not be created or destroyed, it can only be .....

If energy can only changed and therfore not lost, it can also be ...

• concrete.

• concise.

• concerned.

• conserved.

Reactions which transfer heat to the surroundings are ...

Reactions which transfer absorb heat from the surroundings are ...

Write down the type of reaction shown here.

Select the best explanation of why this is exothermic.

• The energy of the reactants stays constant.

• The energy of the reactants goes up.

• The energy of the reactants goes down.

Write down the type of reaction shown here.

Select the best explanation for why this reaction is endothermic.

• The products have less energy than the reactants.

• The products have more energy than the reactants.

• The products have the same energy than the reactants.

Select the correct definition for 'activation energy'.

•  The optimum energy that particles need when they collide for a reaction to occur.

•  The maximum energy that particles need when they collide for a reaction to occur.

•  The minimum energy that particles need when they collide for a reaction to occur.