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hey there thought to share some points about chemstry since the exam is approaching in wednesday !!
i would start with organic chemistry first then later i would post the rest !!
1-hydrocarbons are composed of hydrogen and carbon
2-the general formulas r:
ALKANES = CnH2n+2
ALKENES = CnH2n
ALKOHOLS= CnH2n+1OH
ACIDS = CnH2n+1COOH
3-ALKANES burn with a blue-yellow flame
ALKENES burn with a smoky yellow flame
4-to diffrenciate between alkanes and alkenes:
test : add aq.bromine
result : with alkenes red brown colour changes to colorless
5- chloroethane = ethane+Cl2 OR ethene+HCl
dichloroethene = ethene+Cl2
6-polyethene is used in making plastic bags and sheets !!
7-plastics r used as insulators since they doesnt conduct electricity
8- OH group is also called hydroxyl or hydroxide group
9-the suitable temperature for yeast to work is 35*C
10-yeast dies after fermentation due to :
-due to alkohol poisoning
-the reactants might have been used up
11-biotechnology is using of microorganisms to make food
12-properities of ethanol and methanol :
ethanol= *sweet smelling
*colourless liquid
*has a boiling point of 78*C
methanol=*volatile liquid
*highly toxic
12-narural sources of methane
*natural gas
*the decay of dead plants
13-sources of sulphur are fossil fuels
hope that it would be helpful to all of u guys !!
study well and inshallah u will get A*
(btw if u have got extra points or important ones ,,,, or simplified notes ,,,,, plz post it here it would help a lot of people (iam one of them) ) and thanx !!
i would start with organic chemistry first then later i would post the rest !!
1-hydrocarbons are composed of hydrogen and carbon
2-the general formulas r:
ALKANES = CnH2n+2
ALKENES = CnH2n
ALKOHOLS= CnH2n+1OH
ACIDS = CnH2n+1COOH
3-ALKANES burn with a blue-yellow flame
ALKENES burn with a smoky yellow flame
4-to diffrenciate between alkanes and alkenes:
test : add aq.bromine
result : with alkenes red brown colour changes to colorless
5- chloroethane = ethane+Cl2 OR ethene+HCl
dichloroethene = ethene+Cl2
6-polyethene is used in making plastic bags and sheets !!
7-plastics r used as insulators since they doesnt conduct electricity
8- OH group is also called hydroxyl or hydroxide group
9-the suitable temperature for yeast to work is 35*C
10-yeast dies after fermentation due to :
-due to alkohol poisoning
-the reactants might have been used up
11-biotechnology is using of microorganisms to make food
12-properities of ethanol and methanol :
ethanol= *sweet smelling
*colourless liquid
*has a boiling point of 78*C
methanol=*volatile liquid
*highly toxic
12-narural sources of methane
*natural gas
*the decay of dead plants
13-sources of sulphur are fossil fuels
hope that it would be helpful to all of u guys !!
study well and inshallah u will get A*
(btw if u have got extra points or important ones ,,,, or simplified notes ,,,,, plz post it here it would help a lot of people (iam one of them) ) and thanx !!