When a piece of hard white blackboard chalk is heated strongly in a flame, the mass of the chalk decreases and eventually it crumbles into a fine
white dust. Does this change suggest that the chalk is composed of an
element or a compound? Explain the reasoning for your claim. *

How does a catalyst increase the speed of a reaction? a. the catalyst eliminates the activated complex stage, allowing products to form immediately. b. the catalyst lowers the energy level of the reactants, making it easier for them to react. c. the catalyst makes it easier for the activated complex to form, lowering the activation energy. d. the catalyst raises the energy level of the products, making the reaction finish sooner. reset next