Carole owns a two story house with a heating and cooling unit on each floor. in the winter she mostly uses the downstairs unit because the volume of warm air and warming the whole house through
a) expands, rises, convection
b) expands, sinks, conduction
c) contracts, rises, conversion
d) contracts, sinks, contraption

Harvey kept a balloon with a volume of 348 milliliters at 25.0˚c inside a freezer for a night.  when he took it out, its new volume was 322 milliliters, but its pressure was the same.  if the final temperature of the balloon is the same as the freezer’s, what is the temperature of the freezer? the temperature of the freezer is  kelvins.

Which of these best describes an ionic bond?

Significant figures are digits read directly from the measuring instrument plus one more digit, which is __ by the observer.