Question

Match the following words to their descriptions.
Column A
1.
the smallest unit of matter:
2.
two atoms held together by an ionic bond:
3.
two atoms held together by a covalent bond:
4.
Si
5.
NaCl
6.
CO2

a molecule
b atom
c compound

Answer 1

Here are the matches for the words in Column A to their descriptions:

1. the smallest unit of matter: **b (atom)**
2. two atoms held together by an ionic bond: **c (compound)** (NaCl is an example)
3. two atoms held together by a covalent bond: **a (molecule)** (CO2 is an example)
4. Si: **b (atom)** (it is a single element)
5. NaCl: **c (compound)** (it is made up of sodium and chlorine ions)
6. CO2: **a (molecule)** (it is a molecular compound made of carbon and oxygen)

So the complete matches are:
1 - b
2 - c
3 - a
4 - b
5 - c
6 - a