1: what is the smallest part of a compound called?

mixture

element

atom

molecule

2: one molecule is made of two or more bonded together.

nuclei

mixtures

atoms

compounds

3: which of the following is a pure substance that can't be separated by physical means, and can't be decomposed into other substances by chemical means?

compound

molecule

mixture

element

4: a substance that cannot be separated physically is called a

heterogenous mixture

homogenous mixture

pure substance

mixed substance

5: which term below represents a pure substance that can be separated chemically, but cannot be separated physically, that is made up of two or more different atoms?

mixture

element

molecule

chemical bond

6: water is formed when two hydrogen atoms bond to an oxygen atom.

the hydrogen and the oxygen in this example are different