What is an alkali?

a) A substance that will neutralise an acid
b) A substance that produces H+ ions when added to water
c) A soluble base
d) A chemical which changes colour when added to acids and alkalis

Match the following vocabulary terms to their definitions. 1. amount of energy required to change 1 gram of material from the solid to the liquid state at its melting point 2. a measure of the kinetic energy of the particles of a substance 3. the amount of heat energy required to raise the temperature of 1 gram of liquid water from 14.5°c to 15.5°c 4. amount of energy required to change 1 gram of material from the liquid to the gaseous state at its boiling point 5. the amount of energy required to change 1 gram of a substance 1°c a. temperature b. latent heat of vaporization c. latent heat of fusion d. calorie e. specific heat

Voltaic cells produce a positive overall charge. what does this indicate? a. the reaction is likely to be endothermic. b. the reaction is spontaneous. c. the reaction is not likely to occur. d. the reaction is not spontaneous.

The differences in the properties of two substances in a mixture can be used to separate a substance out of the mixture. what two differences in the properties of oil and water are used when oil is skimmed or poured off the top of a mixture of oil and water? a. solubility and density b. magnetism and boiling point c. particle size and color d. boiling point and density