Pages in this set

Page 1

Preview of page 1
AS Chemistry Revision-Chemistry for Life

1. Avagadro constant, 6.02 x 10²³
number of particles in 1 mole of a substance

2. Empirical formula-simplest ratio of atoms of each element in a compound

3. M oles = Mass
Mr


4. Model of an atom

Particle Mass on relative atomic scale Charg…

Page 2

Preview of page 2
ii. Excited electrons move to a higher energy state- they are promoted
iii. The electromagnetic radiation absorbed by each atom has a definite frequency
related to the difference in energy levels by E = hv




8. Emission spectra
Black background with coloured lines
Lines go down
Lines get closer at…

Page 3

Preview of page 3
ii. 3 bonding pairs and 1 lone pair ­ pyramidal- 109°
iii. 2 bonding pairs and 2 lone pairs ­ bent- 109°



3 groups of electrons ­ planar triangular - 120°



2 groups of electrons ­ linear - 180°



Grou
p2

Be

Mg

Ca

Sr

Ba

Ra

11. Reactions of…

Page 4

Preview of page 4
i. Poison is strongly absorbed onto the catalyst surface
ii. The poison blocks the catalyst surface, preventing reactants from bonding.




13. Mass spectrometer
Sample inlet-
Ionisation area- electrons produced by a heated filament bombard any atoms or
molecules in the sample and knock electrons out. Cations (positive ions) are formed:…

Page 5

Preview of page 5
i. Calculate energy transferred using:

Energy transferred (J) = m x c x T

Mass, specific heat capacity and change in temperature

ii. Calculate the moles of the fuel used using:



M oles = Mass ofMr
fuel used




iii. Enthalpy of combustion (kJmol¯¹)



=energy transferred (kJ )
moles of fuel…

Page 6

Preview of page 6
17. Structural isomerism
Chain isomerism- i.e. unbranched chains to branched chains
Positional isomerism- i.e. pentan-1-ol and pentan-2-ol
Functional group isomerism- same molecular formula but the functional groups are
different. i.e. ethanol and methoxymethane



18. Increasing octane number
Cracking
i. Produces shorter, branched alkane + alkene
ii. Use of zeolite catalyst…

Page 7

Preview of page 7
o Outermost electrons is further away from the nucleus down a group
o This makes electrons less firmly held by the nucleus (weaker attraction)
o Therefore electrons require less energy to remove
Isotopes-atoms of the same element that have the same number of proton but different
numbers of neutrons
Symbol…

Comments

No comments have yet been made

Similar Chemistry resources:

See all Chemistry resources »See all resources »