10. hydrogen can exist as a liquid only at very low
temperatures. this is primarily because the attractive
forces between the molecules are
a)van der waals forces
b) ionic bonds
c) hydrogen bonds
d) covalent forces

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.

Two metal blocks that have slightly different temperatures are placed next to one another. after five minutes, they both have lower but equal temperatures. according to the law of conservation of energy, what  most likelyhappened? energy was created inside the blocks.energy was destroyed inside the blocks.energy was absorbed into the blocks from outside the system.energy was transferred from the warmer block to the cooler block.

Asolution is produced in which water is the solvent and there are four solutes. which of the solutes can dissolve better if the solution is heated?