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Year 7 naming

Last updated 5 months ago
20 questions
https://sites.google.com/rgshw.com/year-7-revision/elements-mixtures-and-compounds

Useful for practice

Copy the following into your books then tackle the questions.


The molecules that make up elements can be described by how many atoms make up the molecule.

Monatomic = 1 atom

Diatomic = 2 atoms

Triatomic = 3 atoms.

1

How many atoms make up a diatomic molecule (e.g. oxygen - O2)?

1

How many atoms make up a diatomic molecule (e.g. Chlorine - Cl2)?

1

How many atoms make up a diatomic molecule (e.g. nitrogen - N2)?

1

How many atoms make up a monatomic element (e.g. Argon - Ar)?

1

How many atoms make up a monatomic element (e.g. Helium - He)?

1

How many atoms make up a monatomic element (e.g. Neon - Ne)?

1

How many atoms make up a triatomic element (e.g. ozone - O3)?

Compounds that are made up of two types of atom only have a name that ends in -ide.

For example a compound made up of sodium and sulfur would be sodium sulfide.


The metal normally makes up the first part of the name and the non metal makes up the last part of the name.

For example a compound of iron and sulfur (FeS) would be iron sulfide.

If the non - metal is oxygen the compound is an oxide (CaO - calcium oxide)

If the non-metal is chlorine the compound is a sulfide. (FeS - iron sulfide)

If the non-metal is chlorine the compound would be a chloride (HCl - hydrogen chloride)

(Later on we would call this iron (II) sulfide but that is not important here).
1

Name the following species
FeS

1

Name the following species
MgS

1

Name the following species
CaS

1

Name the following species
CaO

Some compounds can have different ratios of elements.

The actual name then has a prefix before the second part of the name to show how many of the atom there are in the molecule.

For example CO is carbon monoxide

and CO2 is carbon dioxide

a compond with three of the atoms has the prefix tri

1

What is the name of SO2

1

What is the name of SO3

Compounds that are made of three or more elements including oxygen end with the suffix ate

For example CuSO4 is copper sulfate

NaNO3 is sodium nitrate

CaCO3 is calcium carbonate

4
Match the name to the formulae.
CuSO4 ___________________
MgSO4 ______________________
FeSO4 ______________________
Na2SO4 ___________________
Other Answer Choices:
Copper sulfate
Magnesium sulfate
Iron (II) sulfate
Sodium sulfate

There are two common questions about formulae

How many elements are there in the formula?

This is simply how many capital letters there are.

For example MgSO4 has Mg; S and O so there are three elements.

How many atoms are there in the formula, this requires you to look at the numbers of each element in the formulae.

MgSO4 has one magnesium, one sulfur and four oxygens to give a total of 6 atoms

4
How many different elements are there in the following compounds?
CuSO4 __________
MgSO4 __________
FeSO4 __________
Na2SO4 __________
C6H12O6 __________(Note this is the formula for glucose a type of sugar)
Other Answer Choices:
three
two
one
four
4
How many atoms are there in the formulae of the following compounds?
CuSO4 ________
MgSO4 ________
FeSO4 ________
Na2SO4 __________
Other Answer Choices:
five
seven
three
four
six
6
Name the following compounds
CaCO3 ______________________
Ca(NO3)2 ____________________
CaSO4 ____________________
CaO __________________
CaS ____________________
CaCl2 _____________________
Other Answer Choices:
Calcium oxide
Calcium sulfate
Calcium chloride
Calcium carbonate
Calcium sulfide
Calcium nitrate
6
How many different elements make up each of the following compounds?
CaCO3 __________
Ca(NO3)2 __________
CaSO4 __________
CaO ________
CaS ________
CaCl2 ________
Other Answer Choices:
five
one
eight
four
three
two
seven
six
nine
6
How many atoms are there in the formulae of the following compounds?
CaCO3 __________
Ca(NO3)2 _________
CaSO4 ________
CaO ________
CaS ________
CaCl2 __________
Other Answer Choices:
seven
five
four
two
nine
three
one
six
eight

An exception to the rule about 2 and three atoms is in a family of compounds known as hydroxides.

NaOH is known as sodium hydroxide

Ca(OH)2 is known as calcium hydroxide

6
Name the following compounds
NaOH _____________________
Ca(OH)2 ______________________
KOH ________________________
Mg(OH)2 ________________________
Al(OH)3 ________________________
Fe(OH)2 ________________________
Other Answer Choices:
potassium hydroxide
sodium hydroxide
Iron (II) hydroxide
magnesium hydroxide
aluminium hydroxide
calcium hydroxide