random bits

Question 1

sodium chlorate (I) + HCl

Answer 1

NaClO + 2HCl —> NaCl + Cl2 + H2O

Question 2

how is chromatogram used?

Answer 2

• measure distance moved by spot and solvent
• compare rf value with data book of known values

Question 3

how does gas chromatography separate compounds in a mixture?

Answer 3

relative solubilities to the stationary phase

Question 4

enthalpy of sol

Answer 4

1. pour in ____ of a substance into a polystyrene cup and measure the initial temp
2. add in second substance and measure the change in temp using a thermometer
3. use q = mcat
4. m is the mass of the solution being investigated for a change in temp
5. c in 4.18
6. the enthalpy change when 1 mole of ionic compound fully dissolves in water

Question 5

why enthalpy change is less.

Answer 5

1. non standard conditions
2. evaporation of water
3. heat loss to surroundings
4. incomplete combustion

Question 6

group 3 IE

Answer 6

1. general increase in first IC due to increased nuclear charge, same sheilding, so stronger NA

Question 7

Al and S

Answer 7

1. AL:
   drop in first IE, electron removed in a higher energy 3p subshell (compared to 3s), more energy needed to remove
2. S
   the first paired experiences slight reputation so less energy to remove

Question 8

period 2 IE

Answer 8

all first IE are higher than period 3 due to smaller atomic radius, less shielding and stronger NA)

Question 9

boron and oxygen

Answer 9

1. boron
   electron removed from 2p subsjrll which is of higher energy than 2s
2. O
   2p4 first paired electron experiences slight repulsion