Question

a. link each particle or substance with the correct diagram and description. the first has been completed for you.
particle/substance diagram description
an atom
a molecule
an ion
an element
a compound
a mixture
two or more elements chemically combined
a charged particle
a single particle (no charge)
a collection of atoms or molecules of the same kind
2 or more atoms chemically joined together
different elements or compounds mixed together
b. study the diagrams, and decide which one each statement below is describing.

1. atoms of a single element
2. molecules of a single element
3. a mixture of 2 elements, both of which are made of atoms
4. a mixture of 2 elements, both of which are made of molecules
5. a mixture of 2 elements, one of which is made of atoms, the other molecules
6. a pure compound made of molecules
7. a pure compound made of ions
8. a mixture of 2 compounds

Explanation:

1. For "Atoms of a single element", we look for a diagram with only one - type of uncombined atoms. Diagram h has only one type of un - combined atoms.
2. For "Molecules of a single element", we need a diagram with molecules made up of the same type of atoms. Diagram c has molecules made up of the same type of atoms (the dotted - patterned atoms).
3. For "A mixture of 2 elements, both of which are made of atoms", we look for a diagram with two different types of uncombined atoms. Diagram f has two different types of uncombined atoms (the striped and the circular - shaped un - combined atoms).
4. For "A mixture of 2 elements, both of which are made of molecules", we need a diagram with two different types of molecules. Diagram b has two different types of molecules (the striped - striped molecule and the circular - circular molecule).
5. For "A mixture of 2 elements, one of which is made of atoms, the other molecules", we look for a diagram with one type of atom and one type of molecule. Diagram i has one type of atom (the striped atom) and one type of molecule (the circular - circular molecule).
6. For "A pure compound made of molecules", we need a diagram with only one type of molecule made up of different atoms. Diagram a has only one type of molecule made up of different atoms (the striped and circular atoms in the molecule).
7. For "A pure compound made of ions", we look for a diagram with charged particles (ions). Diagram g has charged particles (ions).
8. For "A mixture of 2 compounds", we need a diagram with two different types of molecules (compounds). Diagram d has two different types of molecules (compounds).

Answer:

1. h
2. c
3. f
4. b
5. i
6. a
7. g
8. d