The half-life of a radioactive element is 1250 years. what percent of atoms remain after 7500 years?

Which step in naming unsaturated hydrocarbons is used for alkenes but not alkynes

Sugar is dissolved in water. which is the solute? sugar neither both water

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.