The pitch of a sound is determined by it's wavelength and , or it's frequency alone?

0.2348 grams of pbcl2 used to form 44.0 ml of solution.

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.

Nuclear decay is the spontaneous decay of one element into a. an x-ray b. a ray of light c. another element