1
Q
Which of these is the smallest particle?
A
An Atom
2
Q
Which of these is the correct symbol for magnesium?
A
Mg
3
Q
Which statement about atoms and molecules is correct?
A
Elements and compounds can exist as molecules
4
Q
How many different atoms are there in a compound?
A
There are two or more atoms in a compound.
5
Q
Approximately how many elements are there?
A
There are approximately 100 elements listed on the periodic table.
6
Q
How many atoms are there in total in a molecule of sulfur trioxide, SO3?
A
Two
7
Q
Why does air not have a definite formula?
A
Air is a mixture, so it doesn’t have a definite formula.
year 7 chemistry
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