Classifying Matter

substance that cannot be broken down into a simpler substance

basic particle from which all elements are made

force of attraction between atoms

group of two or more atoms held together by chemical bonds

substance made of two or more elements that are chemically combined is a set ratio

What shows the elements in the compound and the ratio of atoms

What holds the hydrogen and oxygen atoms together in a water molecule?

How many atoms are in NH₃?

How many atoms of Oxygen are in O₂?

A _________ is made of two or more substances that are together in the same place but their atoms are NOT chemically bonded.