IGCSE- Chemistry double award (edexcel)- Chemical Tests With Complete Solution.
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IGCSE- Chemistry double award (edexcel)- Chemical Tests With Complete Solution.IGCSE- Chemistry double award (edexcel)- Chemical Tests With Complete Solution.IGCSE- Chemistry double award (edexcel)- Chemical Tests With Complete Solution.IGCSE- Chemistry double award (edexcel)- Chemical Tests With C...
IGCSE- Chemistry double award (edexcel)- Chemical
Tests With Complete Solution
Describe the test for hydrogen gas - (correct answer) -method:
ij ij ij ij ij ij ij ij ij
Collect gas into a boiling tube
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Put lit splint inside
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Results:
Burns with a "squeaky Pop" if hydrogen is present
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Equation:
2h2(g) +O2 (g)--> 2H2O(l)
ij ij ij
Describe a test for Oxygen: - (correct answer) -Method:
ij ij ij ij ij ij ij ij
Collect gas ij ij
Insert glowing splint
ij ij
Result:
Splint relights if oxygen is present
ij ij ij ij ij
Describe a test for Carbon Dioxide: - (correct answer) -Method:
ij ij ij ij ij ij ij ij ij
Bubble gas through limewater
ij ij ij
Observe colour change ij ij
Result:
Limewater turns milky & cloudy if CO2 is present
ij ij ij ij ij ij ij ij
Equation:
Ca(OH)2 (aq) + CO2(g) --> CaCO3(s)+ H2O(l)
ij ij ij ij ij ij
Describe a test for Ammonia: - (correct answer) -Method:
ij ij ij ij ij ij ij ij
Lower damp litmus paper or damp universal indicator (pH) paper into test solution
ij ij ij ij ij ij ij ij ij ij ij ij
Result:
Damp red litmus paper turns Ammonia blue
ij ij ij ij ij ij
Damp universal indicator turns 9pH) paper turns purple
ij ij ij ij ij ij ij
Equation:
NH3(g)+H2O(l) --> NH4+(aq) + OH- ij ij ij ij
, * Hydroxide ions make damp litmus paper blue
ij ij ij ij ij ij ij ij
NH3- Ammonia ij
NH4-Ammonium
Describe a test for chlorine: - (correct answer) -Method: ij ij ij ij ij ij ij ij
Lower damp litmus paper or moist starch-iodide paper into test solution
ij ij ij ij ij ij ij ij ij ij ij
Result:
Damp litmus paper is bleached white if chlorine is present
ij ij ij ij ij ij ij ij ij ij
Moist starch iodide paper turns blue if chlorine is present
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Equation(for moist starch iodide): ij ij ij
Cl2-(g) + 2l-(aq) --> 2Cl- (aq) + I2(aq) ij ij ij ij ij ij ij ij
*Iodine formed turns starch blue ij ij ij ij
What are flame tests used for? - (correct answer) -Identify metal cations by the
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colour of the flame produced
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Describe a flame test for metal cations: - (correct answer) -Method: ij ij ij ij ij ij ij ij ij ij
1.) Clean nichrome wire by dipping it into hydrochloric acid (don't want any
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contaminants, chemicals or impurities on the nichrome wire) then placing it into a
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roaring flame (this is repeated until the wire no longer produces colour in the
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flame).
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2.) The end of the wire is dipped into fresh hydrochloric acid and then into the solid
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sample under test
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3.) The end wire should then be placed into a non-roaring, non-luminous bunsen
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flame
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4.) Colour of the flame is recorded and observed
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Why should we use a non roaring, non luminous flame? - (correct answer) -So that
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the colour of the solid is visible in the flame
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*you don't want a yellow sooty flame that will obscure the colour
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past paper question, Suggest two reasons why someone would use a platinum wire
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in a flame test and why it's suitable for it: - (correct answer) -1.) It is unreactive to
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the flame
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2.) The platinum doesn't melt in the fire
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Identify the metal cations by flame colour: Li, Na, K, Ca, Cu, Br - (correct answer) -
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Li+ Red ij
Na+ Yellow ij
K+ Lilac ij
Ca2+ Orange-red ij
Cu2+ Blue-Green ij
Br- Green ij
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