Which best explains why a washing machine does not represent a closed system? a. water and power come from external sources. b. most washers can use a variety of laundry detergent brands. c. it has multiple cycles, such as wash and spin. d. the amount of wash in a load varies.

A. Water and power come from external sources.

Explanation:

A closed system is a physical system that does not allow for transfer of mass in and out of the system, and is not subject to any net force whose source is external to the system. In this example, we would not be able to consider a washing machine a closed system, as the machine requires water to come in from an external source, which would be a transfer of mass.

freezing

deposition

condensation

explanation;

melting also called fusion is the process where solid becomes liquid, sublimation is the process where solid becomes gaseous without first changing to liquid, deposition involves change from gaseous to solid state, freezing involves change from liquid to solid, boiling or evaporation involves change of liquid to gaseous state, while condensation is the change from gaseous state to liquid state.

endothermic reactions involves absorption of heat from the surroundings or the environment while exothermic reactions involves loss of heat energy to the surroundings.

in this case, sublimation, evaporation and melting are endothermic reactions (gain energy from the environment) while, freezing, deposition and condensation are exothermic (loss of energy to the surroundings) reactions.