“We must trust to nothing but facts: These are presented to us by Nature, and cannot deceive. We ought, in every instance, to submit our reasoning to the test of experiment, and never to search for truth but by the natural road of experiment and observation.” ― Antoine Lavoisier, Elements of Chemistry


Popular Posts

c h e m i s t r y 4 u s

The science of today is the technology of tomorrow, Edward Teller

c h e m i s t r y 4 u s

Success is no accident. It is hard work, perseverance, learning, studying, sacrifice and most of all, love of what you are doing or learning to do. Pele

c h e m i s t r y 4 u s

Optimism is the faith that leads to achievement. Nothing can be done without hope and confidence. Helen Keller

c h e m i s t r y 4 u s

Science without religion is lame, religion without science is blind. Albert Einstein

c h e m i s t r y 4 u s

Insanity: doing the same thing over and over again and expecting different results. Albert Einstein

Friday, 27 February 2015

Model Paper 3 for IGCSE Chemistry

Model paper 3.
click here to download

Thursday, 26 February 2015

Types of Chemical Reaction Worksheet


Classify each of the following reactions:

1. Zn   +    Cl2  à ZnCl2
2. 2 H2S +   3 O2 à   2 SO2  +    2 H2O
3. Cu + 2 AgNO3 à Cu(NO3)2 + 2 Ag
4. Mg(OH)2 à MgO + H2O
5. CaCl2    +    Na2SO4 à CaSO4 + 2 NaCl
6. CaO +    H2O à Ca(OH)2
7. Pb  + 4 HCl à PbCl4 + 2 H2
8. Li2O +   CO2 à LiCO3
9. SO2 +   H2O à H2SO3
10. MgCO3 à MgO + CO2
Predict the products and classify each of the following reactions when only the reactants are given: 

1. Mg  +  N2 à
2. C2H6 +  O2 à
3. Zn  + CuCl2  à
4. Ca  + H2à
5. AgNO3    +    NaI à
6. Fe(NO3)3    +    LiOH à
7. MgCO3 à
8. SO2 +    H2O à
9. HI à

10. H2SO4    +    LiOH à