Which particle model diagram represents only one compound composed of elements X and Z? Key
= atom of element X
= atom of element z
A
B
С
D

What is the chemical formula of the following compound

Fossil fuels are organic compounds that are made from

Which statement is true about a catalyst? a: a catalyst decreases the rate of the reaction. b. a catalyst is consumed during a chemical reaction. c. a catalyst lowers the activation energy of a reaction. d. a catalyst increases the reactant concentration during a reaction.