Revision notes topic questions past papers

2AgBr 

→   2Ag  +  Br

2

•  AgBr is colourless at low concentrations but the Ag appears grey-black

•  Parts of the film appear black, grey or white depending on the exposure:

•  Stronger light = black or dark grey

•  Weaker light = light grey

•  Not exposed = white

Photosynthesis

•  This is the process in which plants produce food for reproduction and growth

•  The equation is:

6CO

2

  +  6H

2

O 

→  C6H

12

O6  +  6O

2

•  The process requires sunlight and chlorophyll

•  Chlorophyll is the green pigment in plants which absorbs sunlight and acts as the catalyst 

for photosynthesis

7.1.2  RATE (SPEED) OF REACTION cont...

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7 CHEMICAL REACTIONS

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CIE IGCSE Chemistry Revision Notes

CIE IGCSE Chemistry Resources

REVISION NOTES      TOPIC QUESTIONS      PAST PAPERS

EXAM QUESTIONS

QUESTION 1

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QUESTION 2

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Which of the following processes represents a physical change?