Combustion of gasoline in automobiles produces poisonous gases. catalytic converters that contain solid platinum, palladium, and rhodium change these poisonous gases into harmless gases. which statement describes the catalyst?
it is a homogeneous catalyst.
it provides an alternative pathway for the reaction.
it combines with poisonous gases to make them harmless.
it increases the energy that is needed for the reaction to occur.

Answer is: It combines with poisonous gases to make them harmless.

The catalyst splits up the molecules (hydrocarbons, carbon monoxide, nitrogen oxides) into their atoms (oxygen, nitrogen, hydrogen, carbon, etc.).

The atoms then recombine into harmless molecules such as carbon dioxide, nitrogen and water.

This is heterogeneous catalysis, because the catalysis occurs at the interface of two phases (gas-solid).

It decreases the energy that is needed for the reaction to occur.

what is the general relationship between a galaxy's distance from earth and its speed?

the answer is:

the farther away a galaxy is from us, the faster it is moving away from us.