ASK QUESTIONS ON AS UNIT ! CHEMISTRY

[aniekan]

Hey guys feel free to ask any question about Unit 1 chemistry and Hopefully I will try my best to provide valid answers

 

[Lilpumpkin]

hello,i was wondering if you could tell me a proper answer for question 18)c)i) in june 2011 chemistry
thank you

 

[aniekan]

hello,i was wondering if you could tell me a proper answer for question 18)c)i) in june 2011 chemistry
thank you

- No standard conditions applied
_Heat loss to the surrounding
_Heat energy absorbed by the apparatus ( polystyrene cup or crucible)
_Incomplete reaction

That's all I can think of

 

[Lilpumpkin]

- No standard conditions applied
_Heat loss to the surrounding
_Heat energy absorbed by the apparatus ( polystyrene cup or crucible)
_Incomplete reaction

That's all I can think of

thank you but i meant c)part one

 

[aniekan]

Using a measuring cylinder, transfer probably 25cm3 of water into a polystyrene cup.
Measure the initial temperature of the solution.
Add know mass of CuSO4.5H2O into the water.
Stir the mixture and using a thermometer measure the final temperature of the solution.

 

[tanzina500]

What does 'High Octane Rating' mean?

 

[aniekan]

What does 'High Octane Rating' mean?

It means the fuel can ignite easily as it has a higher ratio of Branched to straight chain atoms.

 

[penelope365]

http://www.edexcel.com/migrationdoc...2000/June 2011 - QP/6CH01_01_que_20110523.pdf

Question 18 aii PLEASE HELPP

 

[aniekan]

http://www.edexcel.com/migrationdocuments/QP GCE Curriculum 2000/June 2011 - QP/6CH01_01_que_20110523.pdf
CusSO4(aq)
Question 18 aii PLEASE HELPP

 

[penelope365]

View attachment 19865

why isnt it b-a ? isnt the formula normally B-A?

 

[aniekan]

why isnt it b-a ? isnt the formula normally B-A?

No there are two formulas

Combustion : Reactants - Products

Formation: Products - Reactants

Since both arrows are pointing down ; we assume it's similar to Combustion. Therefore it will be A - B

 

[penelope365]

No there are two formulas

Combustion : Reactants - Products

Formation: Products - Reactants

Since both arrows are pointing down ; we assume it's similar to Combustion. Therefore it will be A - B

Omgg thankk you

 

[tanzina500]

It means the fuel can ignite easily as it has a higher ratio of Branched to straight chain atoms.

got it!

 

[Lost_Life]

Hey i don't quite get the octane part or Reforming..?? could you explain, please?

 

[aniekan]

Hey i don't quite get the octane part or Reforming..?? could you explain, please?

Reforming is the conversion of long straight chain alkane molecule into ring(aromatic hydrocarbon) molecule