On the ph scale, which value represents an acid? 2 8 12

This image is an example of a(n) a) atom. b) compound. c) mixture. d) molecule.

The diagram below shows the different phase transitions that occur in matter. which arrow represents the transition in which dew is formed?

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.