chemical formulas 1 yr 10 mock
- Created by: tia5303
- Created on: 15-07-20 14:03
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- chemical formulas
- common ions
- positive ions (1+ ions)
- lithium, Li
- sodium, Na
- potassium, K
- positive ions (2+ ions)
- magnesium, Mg
- calcium, Ca
- negative ions (2- ions)
- carbonate, CO
- sulfate, SO
- oxide, O
- sulfide, S
- negative ions (1- ions)
- hydroxide, OH
- nitrate, NO
- fluoride, F
- chloride, Cl
- bromide, B
- iodide, I
- any of the positive ions can combine with any of the negative ions to form an ionic compound
- for example, Na and Cl form NaCl, where sodium becomes a positive ion and chlorine becomes a negative ion
- positive ions (1+ ions)
- you can work out the formula of an ionic compound
- ionic compounds are made of a positive charged part and a negatively charged par
- the overall charge of any compound is 0. so all the negative charges in the compound must balance all the positive charges.
- you can use the charges on the individual ions present to work out the formula for the ionic compound.
- you need to be able to write formulas using chemical symbols.
- (example on flashcard)
- you need to be able to write formulas using chemical symbols.
- formulas of molecules
- prefixes tell you how many of a certain atom are in a molecule.
- the main ones
- mono- = one
- di- = two
- e.g each molecule of carbon monoxide contains one oxygen atom and each molecule of carbon dioxide contains two oxygen atoms.
- tri- = three
- the main ones
- common molecules
- water = H O
- ammonia = NH
- carbon dioxide = CO
- hydrogen = H
- Chlorine = Cl
- oxygen = O
- prefixes tell you how many of a certain atom are in a molecule.
- common ions
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