LESSON 1 BALANCING & WORD EQUATIONS
WHAT ARE PHASE SYMBOLS?They are subscripts that indicate the phase of the chemical, such as
eg. Al(s) - solid , H2O(l) - liquid , H2(g) - gas , AgNo(aq) - Aqueous
(Solution means something that is dissolved in water and is therefore an aqueous phase.)
1) In chemical equations it must include phase symbols and a balance of the equation
2) Diatomic molecules: are elements that when on its own in an equation will always consist of 2
atoms (these elements form a seven on the periodic table)
eg. H2 , N2 , O2 , F2 , CI2 , BR2 , I2
3) Polyatomic molecules: P4 , S8Examples:
1) A solution of barium phosphate is mixed with aqueous sodium sulphate to yield solid barium sulphate and aqueous sodium phosphate.
Ba3(PO4)2 (aq) + 3 Na2SO4 (aq) ~> 3 BaSO4 (s) + 2 Na3PO4 (aq)
2) A solution of aluminum chloride , carbon dioxide and water can be prepared mixing pure aluminum carbonate with a solution of hydrochloric acid.
Al2(CO3)3 (s) + 6 HCI (aq) ~> 3 CO2 (g) + 2 AlCI3 (aq) + 3 H2O
9.13.10
posted by chemistry11 @ 6:40 PM
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