Please help. ASAP! What most likely happens when water loses heat?

It changes into ice.
It changes into vapor.
Its temperature increases.
Its temperature remains constant.

Which of the following observations indicates that there is a small, dense, positively charged part in the center of an atom? some uncharged particles are scattered by a gold foil. all uncharged particles are attracted towards a gold foil. all positively charged particles pass straight through a gold foil. some positively charged particles bounce back from a gold foil.

Asolid that forms and separates from a liquid mixture is called

8.98 dm3 of hydrogen gas is collected at 38.8 °c. find the volume the gas will occupy at -39.9 °c if the pressure remains constant.