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Starter Question. What is the shape of the following compounds BF 3 OCl 2 NH 4 +. Trigonal planar. Do not hand in homework until you have completed the starter question. You will need it to help you. angular. tetrahedral. What type of bonding occurs in the following compounds

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Starter Question

What is the shape of the following compounds

BF3

OCl2

NH4+

Trigonal planar

Do not hand in homework until you have completed the starter question. You will need it to help you

angular

tetrahedral

What type of bonding occurs in the following compounds

Barium Chloride

Silicon carbide

Dinitrogentetroxide

ionic

covalent

covalent

Something that is placed infront of a word. In Chemistry it usually tells us the size of a unit or number of atoms

What is a prefix?


Nomenclature

Sometimes the name of a compound tells us what its formula is.

To work out the formula we need to look for a few things

1. Prefixes

1

2

3

4


When prefixes are used in naming a compound they determine what the formula is and not any other method

Using this information can you determine the formula of the following compounds?

Carbon monoxide

Sulphur dioxide

Diphosphoruspentoxide

Carbon tertrahydride

CO

SO2

P2O5

CH4


2. Endings what the formula is and not any other method

The ending of a compound can tell us which elements are present.

ide-

ite-

ate-

This means that only the lements in the name are present in the compound

These means that there is a hidden oxygen in the compound


Using this information name the following elements in the following compounds

Sodium chloride

Carbon tetrahydride

Copper sulphate

Sodium hydrogen carbonate

Sodium chlorine

Carbon hydrogen

Copper sulphur oxygen

Sodium hydrogen carbon oxygen


3. following compoundsValencies

The valency of an element can be used to determine the formula

Remember the valency of an element is different from the number of valence electrons

1

0

3

4

3

2

1

2


The cross- over method for determining formula following compounds

1. Write out the symbol of the elements involved in the formula

Aluminium oxide

Al O

2. Write the valency of each element below it

Al O

3 2

3. Cross over the valencies

Al O

3 2

2 3


4. following compoundsIf the number have a common denominator divide down

e.g. C O

4 2

2 4 ÷2

1 2

5. Write out the formula

Al2O3

NB: Remember to use subscripts to show how many of each atom is present in the formula


Now try to determine the formula of the following compounds following compounds

Magnesium oxide calcium sulphide

Calcium nitride potassium oxide


Now complete the worksheets you have been handed. When complete they need to be handed in.

When finished please complete questions p221- 226 in the textbook


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