The role of a catalyst in a chemical reaction is to a: be non-specific enough to work in any reaction. b: lower the activation energy and speed up the reaction. c: increase the amount of energy required for the reaction to occur d: enter into the reactants to change the product.

Last week i was assigned a thematic. we have groups of three but the people i was assigned with haven't been in school for days. i would appreciate if anyone can me with my thematic . i highlighted most of the important steps and i circled my thematic topic. in desperate need : ( its due on february 19

Factors that can increase mutation rates a. high temps b. low temps c. food additives d. uv rays

What substance is the most acidic. lemon juice. tomato juice. sodium hydroxide. water