What is the purpose of the arrow in a chemical equation?

A) It indicates the direction in which the reaction occurs.

B) It separates the elements from the compounds.

C) It indicates the direction of increase in the number of molecules.

D) It indicates the direction of heat movement in a reaction.

Which statement describes the appearance of a temperature-vs.-time graph? a horizontal line shows that the temperature increases at a constant rate over time. a vertical line shows that the temperature decreases at a constant rate over time. horizontal lines where the temperature is constant during phase changes connect upward-sloping lines where the temperature increases. horizontal lines where the temperature increases are connected by upward-sloping lines where the temperature is constant for each phase.

9. write the chemical equation for the following word equations. include symbols for physical states in the equation. a. solid zinc sulfide + oxygen gas -> solid zinc oxide + sulfur dioxide gas b. aqueous hydrochloric acid + aqueous barium hydroxide -> aqueous barium chloride + water

What relationship exists between an enzyme and a catalyst?