Aaron.Judd
Member
- Joined
- Aug 20, 2008
- Messages
- 372
- Gender
- Male
- HSC
- 2008
Question 4 was just about the easiest MC I thought.
yeah i put 4.0 but that was an educated guess - i was at pains on that fukn qn spent ages on it..tau281290 said:Question 14 is the only one im unsure of...
I put pH 7.0 but that's pretty wrong.
Exothermic.berna007 said:GUYS 7 IS NOT D!!!!!
if u add reactant, it will shift to the product side..and therefore shift left..however, if u increase temp, it will go to the reactant side and shift RIGHT
THEREFORE ANSWER TO 7 IS C NOT D!!!!!
lmaoo
product side = left side actually..tommykins said:Exothermic.
Increase temp -> want to decrease -> left reaction as that is endothermic.
Product side = right side.
got the question in fron of me.berna007 said:product side = left side actually..
just look at the question okay!!!!
thank god..tommykins said:Exothermic.
Increase temp -> want to decrease -> left reaction as that is endothermic.
Product side = right side.
i think you have misunderstood a part of chemistry. that is, the LHS HI chemical is a reactant andt he H2 and I2 chemicals are products, it does not have to be ther other way around,,,,that is its not as if reactants can only be two compunds and when they reactot hey form one compund which does not have to be a product.....so the lhs is the ractant adn the rhs is the product....berna007 said:product side = left side actually..
just look at the question okay!!!!
lol dittooo harddddddddtommykins said:lol the 4 d's put me off so bad.
hey guys im not sure if this is right but i think that 7 is c because adding more of the reactant would shift to the left in this case. well thats what i thought... probs wrong...hoochiscrazy said:whoaaaaa 15/15 (according to the answers posted on here) pretty happy with that since yesterday did a whole bunch on board of studies website and got 82%!! lol
1-A
2-B
3-A
4-C
5-C
6-D
7-D
8-D
9-D
10-B
11-A
12-A
13-C
14-B
15-B
Left <> rightewasemma said:hey guys im not sure if this is right but i think that 7 is c because adding more of the reactant would shift to the left in this case. well thats what i thought... probs wrong...
To do q 14 :shakky15 said:yeah i put 4.0 but that was an educated guess - i was at pains on that fukn qn spent ages on it..
otherwise 14/15 so im pretty happy.
Thats moles.chewnugm said:To do q 14 :
0.02*0.08-0.03*0.05=1*10^-4
therefore 1*10^-4 H+ ions are excess. pH=-log[H+]
pH=-log[1*10^-4]
pH=4
Maybe this sounds stupid, but that just doesn't seem logical that a strong base and a strong acid could mix to make a solution with a pH that low.Kearnzo said:Thats moles.
Ph = -log10[H+]
c = n/v
volume is 20mls +30 mls = 0.05 L
therefore [H+] is 0.0001/0.05 = 0.002
Ph = -log10[0.002] is equal to 2.69... = 2.7
who cares if shes a teacher from JRAHS? teachers make mistakes and the answer is B, i put C aswell however you're loging the amount of moles not the concentration of H30+Aaron.Judd said:I'm not sure of the exxact working, but the answer is defiantly C accorging to my Chem teacher at James Ruse and shes extrememly smart.
>.< how can you argue when I just did all the working?Propadanda said:Maybe this sounds stupid, but that just doesn't seem logical that a strong base and a strong acid could mix to make a solution with a pH that low.
I'd say C lol, even though I put D.