What is a solvent? Question 1 options:

A part of the chromatography apparatus.

The paper that is placed in the liquid.

A substance, usually liquid, that can dissolve other substance.

A substance that is dissolved.

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.

Which sentence about particles in matter is true? a. atoms are present in solids and liquids but not in gases. b. the particles of matter are in constant motion. c. the same kinds of atoms are found in different elements. d. when a solid changes to a liquid, the sizes of the particles change.

What substance has a mass of 9.5g and volume of 2.1cm^3