CuS04(s)------->Cus04-5H20
Anhydrous H20 Hydrated
Tuesday, March 22, 2011
Test for Water
anhydrous Copper sulphate (white) turns blue if water is present.
CuS04(s)------->Cus04-5H20
Anhydrous H20 Hydrated
CuS04(s)------->Cus04-5H20
Anhydrous H20 Hydrated
Test for Gases
Test for Ammonia Gas, NH3 (g)
Ammonia:
1) Has no colour.
2) Has a characteristic pungent smell.
3) Will turn moist red litmus paper blue,
and moist universal indicator paper blue.
It is alkaline in water, pH = 11.5.
4) Will put out a lit splint.
Test for Carbon Dioxide Gas, CO2(g).
Carbon dioxide:
1) Has no colour or smell.
2) Will put out a lit splint.
3) Will turn moist blue litmus paper red,
and moist universal indicator paper orange.
In water it forms carbonic acid (H2CO3), it is a weak acid (see Carbon Cycle).
Test for Chlorine Gas, Cl2(g).
Chlorine:
1) Is green-yellow in colour.
2) Has a pungent choking smell.
3) Will turn moist litmus or universal indicator paper red,
and then bleach it white.
4) Will put out a lit splint.
Test for Oxygen Gas, O2(g).
Oxygen:
1) Has no colour or smell.
2) Has no effect on moist litmus paper
or moist universal indicator paper, it is neutral.
3) Will relight a glowing splint.
Test for Hydrogen Gas, H2(g).
Hydrogen:
1) Has no colour or smell.
2) Has no effect on moist litmus paper
or moist universal indicator paper - it is neutral.
3) Burns with a characteristic 'pop'.
Ammonia:
1) Has no colour.
2) Has a characteristic pungent smell.
3) Will turn moist red litmus paper blue,
and moist universal indicator paper blue.
It is alkaline in water, pH = 11.5.
4) Will put out a lit splint.
Test for Carbon Dioxide Gas, CO2(g).
Carbon dioxide:
1) Has no colour or smell.
2) Will put out a lit splint.
3) Will turn moist blue litmus paper red,
and moist universal indicator paper orange.
In water it forms carbonic acid (H2CO3), it is a weak acid (see Carbon Cycle).
Test for Chlorine Gas, Cl2(g).
Chlorine:
1) Is green-yellow in colour.
2) Has a pungent choking smell.
3) Will turn moist litmus or universal indicator paper red,
and then bleach it white.
4) Will put out a lit splint.
Test for Oxygen Gas, O2(g).
Oxygen:
1) Has no colour or smell.
2) Has no effect on moist litmus paper
or moist universal indicator paper, it is neutral.
3) Will relight a glowing splint.
Test for Hydrogen Gas, H2(g).
Hydrogen:
1) Has no colour or smell.
2) Has no effect on moist litmus paper
or moist universal indicator paper - it is neutral.
3) Burns with a characteristic 'pop'.
Ammonium Chloride
Bromide, Iodide, Chloride
Bromide, Iodide, Chloride were all added with nitric acid and then nitrate.
This is the before and after:
This is the before and after:
Ammonium Chloride Test
Friday, March 18, 2011
Images: Chemical Testing
Images: Chemical Testing
Calcium:
Ca 2+ reacting with fire.
Lithium:
Li 2+ reacting with fire
Sodium:
Na 2+ reacting with fire
Copper:
Cu 2+ reacting with fire
Potassium:
K+ reacting with fire
Ca 2+ reacting with fire.
Lithium:
Li 2+ reacting with fire
Sodium:
Na 2+ reacting with fire
Copper:
Cu 2+ reacting with fire
Potassium:
K+ reacting with fire
MONDAY, 14 MARCH 2011
Reactions and Products
During chemical reactions atoms become bounded (joined) together in new ways.
Magnesium + copper oxide = magnesium Oxide + Copper
Chemical reactions are different to physical changes. In physical changes, atoms remain bounded in the same way before and after a change.
Chemical Changes/ chemical reactions.
In chemical reactions new substances are formed. We call the starting materials reactants and the substances that are formed: products.
During chemical changes (reactions) different atoms become bonded.
Chemical bonds are not easy to break.
Because of this chemical changes are usually difficult to reverse (It is difficult to change product back into reactants) e.g. we cannot “un-burn” magnesium, and we cannot un-bake a cake :)
Magnesium + copper oxide = magnesium Oxide + Copper
Chemical reactions are different to physical changes. In physical changes, atoms remain bounded in the same way before and after a change.
Chemical Changes/ chemical reactions.
In chemical reactions new substances are formed. We call the starting materials reactants and the substances that are formed: products.
During chemical changes (reactions) different atoms become bonded.
Chemical bonds are not easy to break.
Because of this chemical changes are usually difficult to reverse (It is difficult to change product back into reactants) e.g. we cannot “un-burn” magnesium, and we cannot un-bake a cake :)
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