Chemistry Quiz

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

Exothermic reactions do not require any activation energy.

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

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

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

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

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

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

Energy is needed to break bonds in chemical reactions.

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