Calculate the hydroxide ion concentration in an aqueous solution with a pH of 9.85 at 25°C. 8.7 × 10-10 M 1.4 × 10-10 M 4.2 × 10-10 M 6.5 × 10-5 M 7.1 × 10-5 M

Which of these conditions most likely produces an unstable isotope?

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.

Describe the forces both attractive and repulsive that occur as two atoms move closer together.