How does heat move?

from a warmer to a colder object

toward a hot object

from a cooler to a warmer object

away from a cold object

Why is the melting of ice a physical change ?

What is the most common reason for matter changing its state?

Fill in the blanks for the following statements: the rms speed of the molecules in a sample of h2 gas at 300 k will be times larger than the rms speed of o2 molecules at the same temperature, and the ratio µrms (h2) / µrms (o2) with increasing temperature. a not enough information is given to answer this question b sixteen, will not change c four, will not change d four, will increase e sixteen, will decrease