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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What is the shape of the following compounds
Do not hand in homework until you have completed the starter question. You will need it to help you
What type of bonding occurs in the following compounds
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?
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
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?
The ending of a compound can tell us which elements are present.
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 hydrogen carbonate
Copper sulphur oxygen
Sodium hydrogen carbon oxygen
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
The cross- over method for determining formula
1. Write out the symbol of the elements involved in the formula
2. Write the valency of each element below it
3. Cross over the valencies
4. If the number have a common denominator divide down
5. Write out the formula
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
Magnesium oxidecalcium sulphide
Calcium nitridepotassium 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