Chemistry Lab

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TITLE: THE EFFECT OF HEATING DIFFERENT SUBSTANCES
INTRODUCTION: In this exercise, it was required to observe carefully what happened when certain substances were heated in a burner, and to note the appearance of the residue after heating. AIM: To observe the effects of heating different substances. MATERIALS:

Hard glass test tubes
Powered samples of
Lead (II) nitrate
Copper (II) sulphate
Ammonium chloride
Zinc sulphate
Basic copper (II) carbonate, CuCO3. Cu(OH)2 Blue and red litmus and a splint
METHOD:
1.About 1g of the solid was placed in a dry test tube and the test tube and its contents was heated in a burner, gently at first the strongly. During the heating the test tube was sloping slightly downwards.

2.Gases were tested and evolved with moist blue and red litmus and with a glowing splint

3.The results were tabulated noting carefully all that happens to the compound when it is heated and whether any color changes occur on heating

RESULTS:

Substance
heatedObservation made
On heatingEffect of gases evolved
Blue litmusRed litmusGlowing splint
Copper (II) sulphate

Lead (II) nitrate

Ammonium chloride

Zinc sulphate

Basic copper (II)
carbonateChange from blue to white
Water droplets formed

Changes from white to orange
Bubbled before turning to a gas

No color change
Powder hardened

Bubbled while heating
No color change

Changed from green to black
Crystals floated upon heatingYes

Yes

Yes

Yes

YesNo change

No change

No change

No change

No changeNo change

Yes

No change

No change

No change

DISSCUSION: The solids that underwent color change upon heating include cupric carbonate, copper (II) sulphate and lead (II) nitrate. The solids that evolved water vapor upon heating was cupric carbonate and copper (II) sulphate the was proven by the formation of water droplets....
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