General Chemical Skills
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Define atom.
The smallest electrically neutral particle of an element that can take part in chemical change.
Define ion
An atom or group of atoms, which carries an electrical charge.
Define relative atomic mass
The ratio of the average mass of one atom of an element to one twelfth of the mass of an atom of carbon 12
Define compound
A substance formed when two or more chemical elements are chemically bonded together.
Define molecule.
The smallest electrically neutral particle of an element or compound that can exist on its own.
Define Avogadro’s number.
It is equal to 6.02 X 10^23 and it is the number of the carbon atoms to be found in 12 grams of carbon twelve
Define relative formula mass
The sum of the masses of the elements in the formula or compound
What does a I, II or III mean about the charge of an ion?
It is a +1 +2 or +3 charge.
What does an element ending with ide mean. E.g. Nitride, chloride
It is just the element.
What is the charge of phosphate?
-3
What does a V, VI or VII mean?
A -3, -2 or -1 charge
What is the equation of phosphate?
PO(4)
What does -ate mean at the end of an element? E.g. Chlorate, sulphate or carbonate?
Bonded with oxygen.
What is the charge of sulphate?
-2
What is the equation of sulphate ?
SO(4)
What is the equation of carbonate?
CO(3)
What is the charge of carbonate ?
-2
What is the charge of hydroxide?
-1
What is the equation of hydroxide ?
OH
What is the charge of nitrate?
-1
What is the equation of nitrate?
NO(3)
What is the charge of chlorate ?
-1
What is the equation of chlorate?
Cl O(3)
What is the charge of bromate?
-1