Which best describes the Group 1 metals? a) hard or soft?
b) high density or low density?
c) high melting point or low melting point?
d) reactive or unreactive, with water?

Which process does not require the presence of a physical substance in order to transfer heat? air in the atmosphere is heated by the ground. this warm air then rises, and cooler air falls. this is an example of what type of process? how is conduction different from radiation?

The density of the solid phase of a substance is 0.90 g/cm3 and the density of the liquid phase is 1.0 g/cm3. a large increase in pressure will a. lower the freezing point b. raise the freezing point c. lower the boiling point d. raise the triple point e. lower the triple point

Nuclear decay is the spontaneous decay of one element into a. an x-ray b. a ray of light c. another element