Chemistry Quiz

Nuclear reactions have many useful applications, but they also have harmful biological effects.

• True

• False

Exothermic reactions do not require any activation energy.

• True

• False

An alpha particle has the same composition as a helium nucleus.

• True

• False

Chemical equations are balanced by changing the subscripts of the molecules.

• True

• False

A radioactive alkaline earth element’s atomic number increases by two after emitting alpha radiation.

• True

• False

The emission of gamma rays results in the loss of energy in the nucleus of atoms.

• True

• False

Henri Becquerel accidentally discovered that phosphorus uranium salts produced spontaneous emissions that darkened photographic plates.

• True

• False

The rate of a reaction is the speed at which products form or reactants disappear.

• True

• False

Energy is needed to break bonds in chemical reactions.

• True

• False

Fusion reactions are commercially viable because they require low energies to initiate and sustain a reaction.

• True

• False