For combustion you do reactants take away products. I rememeber this using the acronym CRAP or CAP ( combustion reactant takeaway products) CRAP sticks in my head aha
Give the formula of an organic compound that forms an alkaline buffer solution whenadded to a solution of ethylamine. The answer is CH3CH2NH3Cl and I'm not sure why
Give the formula of an organic compound that forms an alkaline buffer solution whenadded to a solution of ethylamine. The answer is CH3CH2NH3Cl and I'm not sure why
It's normally the salt of your amine so yeah ... I suppose it is because of acid and their salt forming buffers?!
For a titration, is the acid always in the burette or is the solution of unknown just always the base (in flask)?
I think the standard solution (the one you know the concentration of) goes in the burette and the unknown goes in the flask. Don't quote me on that tho
Methyl butanoate, C5H10O2, is an ester used in the food industry to give products the flavour of apples. structural formula: CH3C02CH2CH2CH3
Including methyl butanoate, how many structural isomers are there of C5H10O2 that are esters? A) 6 B) 8 C) 9 D) 10 if anyone has doubts concerning the question ... let me know so I can explain the question in more detail.... thank u
I have absolutely no idea on how to answer this question: Suggest 2 reasons why standard enthalpy changes of combustion determined experimentally are less exothermic than the calculated theoretical values. (for 2 marks OCR Chemistry A)
I have absolutely no idea on how to answer this question: Suggest 2 reasons why standard enthalpy changes of combustion determined experimentally are less exothermic than the calculated theoretical values. (for 2 marks OCR Chemistry A)
Incomplete combustion so not everything has burned completely. And heat lost to surroundings
guys if your doing aqa try the a level papers not just AS because in the new spec papers there is stuff for paper 2 we can use especially in A Level Paper 3
How do you work this out please? Compound F contains C, H and O only. O contains 54.2% oxygen by mass. Mr of F = 118 gmol-1 Show that the molecular formula of F= C4H6O4 [2 MARKS]
Differences between theoretical and Born Haber (experimental)lattice enthalpies
The Born Haber lattice enthalpy is the real experimental value.When a compound shows covalent character, the theoretical and theborn Haber lattice enthalpies differ. The more the covalent characterthe bigger the difference between the values.
When the negative ion becomes distorted and more covalent we say it becomes polarised. Themetal cation that causes the polarisation is called more polarising if it polarises the negative ion.
Ionic with covalent character - The charge cloud is distorted .The theoretical and the experimental Born Haber lattice enthalpies will differ
100 % ionic - the ions are spherical.The theoretical and the born Haber latticeenthalpies will be the same