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Edexcel IGCSE CHEMISTRY PAPER 1 ( QUESTIONS WITH ANSWERS ) 100% VERIFIED / RATED A+
Edexcel IGCSE CHEMISTRY PAPER 1 ( QUESTIONS WITH ANSWERS ) 100% VERIFIED / RATED A+
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Edexcel IGCSE CHEMISTRY PAPER 1 (QUESTIONS WITH ANSWERS ) 100% VERIFIED /
RATED A+
Potassium manganate (VII) and water (purple colour spreads), ammonia and hydrogen chloride (white
ring forms closer to hydrogen chloride), bromine gas and air (brown bromine gas diffuses) - ANSWER 3
experiments to show diffusion
4OH- = O2 + 2H2O + 4E- - ANSWER Half equation for hydroxide ions
Moves slowly (on the surface), fizzes, eventually disappears - ANSWER Lithium with water - observations
Moves quickly (on the surface), fizzes rapidly, may ignite - ANSWER Sodium with water - observations
Reacts vigorously, burns with a lilac flame, sometimes explodes - ANSWER Potassium with water -
observations
Heat copper (in a tube and pass air over it) - ANSWER Experiment to test the proportion of oxygen in air
Pale blue - ANSWER Sulfur flame colour
Orange/yellow - ANSWER Carbon flame colour
Downward delivery (it is denser than air) - ANSWER How to collect chlorine
2H2O + CaCO3 = CaCl2 + H2O + CO2 - ANSWER How to make CO2 in a lab (equation)
, It is soluble in water - ANSWER Why can CO2 be used in fizzy drinks?
Platinum wire, dip in hydrochloric acid, hold in flame - ANSWER Flame test wire to use + how to sterilise
it
So the gas can dissolve and make the colour change - ANSWER Why does litmus paper need to be damp
when testing a gas?
Hydrochloric acid - ANSWER Acid added to remove any impurities for the sulphate test
Nitric acid - ANSWER Acid added to remove any impurities for the halide test
Bleaches damp litmus paper white - ANSWER Test for chlorine
A group of organic compounds that can all be represented by the same general formula - ANSWER
Homologous series
Similar chemical properties, a trend in physical properties (boiling points, colour, viscosity) - ANSWER
Members of the same homologous series have...
A group of atoms which are arranged or bonded in a particular way and which determine how an organic
compound will react - ANSWER Functional group
Carbon to hydrogen bond - ANSWER Alkane functional group
Carbon double bond - ANSWER Alkene functional group
Hydroxide bond - ANSWER Alcohol functional group
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