Why are heat transfers associated with phase changes known as latent or "hidden" heats?

heat absorbed or released in a phase change is measured in kj while temperature is measured in °c.

the enthalpy of vaporization and enthalpy of condensation values for a substance add to zero.

the enthalpy change values for pure substances tend to be small.

the heat absorbed or released by a phase change does not cause a temperature change.

Based on the graph, how would you describe the net forces acting on the moving object? a) net force equals zero. b) net force is greater to the right. c) there is no way to determine net force. d) net force is positive and to the right.

Electroplating is a way to coat a complex metal object with a very thin (and hence inexpensive) layer of a precious metal, such as silver or gold. in essence the metal object is made the cathode of an electrolytic cell in which the precious metal cations are dissolved in aqueous solution. suppose a current of 480.ma is passed through an electroplating cell with an aqueous solution of agno3 in the cathode compartment for 46.0 seconds. calculate the mass of pure silver deposited on a metal object made into the cathode of the cell. round your answer to 3 significant digits. also, be sure your answer contains a unit symbol. ×10μ

The speed of light in a material is 0.50 c. what is the critical angle of a light ray at the interface between the material and a vacuum?