Rick's Science Quiz True/False

The total amount of energy needed to break bonds or the total amount released as excess energy when bonds are formed, determines if it is endothermic or exothermic.

True

An endothermic reaction releases energy

False

An exothermic reaction absorbs energy

False

An exothermic reaction gets colder

False

Both bond breaking and bond forming are taking place in a physical change.

False

Electrons are positive

False

In a chemical reaction, the bonds between the molecules/atoms of the reactants are broken apart. When the molecules/atoms form new bonds, nothing happens.

False

Neutrons determine the net charge

False

A larger amount of energy absorbed from the surroundings is needed to break bonds of reactants in an endothermic reaction.

True

An endothermic reaction absorbs energy

True

An endothermic reaction gets colder

True

An exothermic reaction releases energy

True

Both bond breaking and bond forming are taking place in a chemical reaction.

True

In a chemical reaction, the bonds between the molecules/atoms of the reactants are broken apart. When the molecules/atoms form new bonds, a product is created.

True

It takes energy (usually thermal energy) to form or break bonds.

True

Protons determine the element

True

Some thermal energy absorbed from the surroundings is needed to start the reaction. This is called activation energy.

True