Solubility Problems...

Uhhmm today it was supposed to be jennie who will scribe,but she skip...opppsss... haha so i decided to scribe today...

well we didn't do that much we just

answered the Solubility Equilibria Assignment No. 3 and it's pretty much straightforward..we did this one over the past few days...

and also Ms K. gave us a hand out and it's all about using solubility Product Constants,it is all about the Ksp of each compounds.There`s the Compound and its Ksp.So for those of you who were absent today,guess what!

we will be having our quiz tomorrow and don`t forget to review o.k.!!!!see yah the next scribe would be phoebe..something,it's sean

Last topic in Kinetics

Ms. K discussed our last topic in Kinetics and she gave us a hand out of our review sheet.
Rate law
It is an expression which relates the rate of a reaction to the concentration of the reactants.It helps us to calculate the rate of a reaction with the given concentrations of reactants.
A--->products
Rate=-ΔA/Δt
*rate of consumption a is directly proportional to its concentration,the faster a is consumed the lower its concentration.

formula: Rate=k[A]^x
where in:
k is the constant of proportionality
A is the concentration of A
x is the power,called the order of the reaction
*rate constant can only be determined experimentally
*the rate constant is specific for each reaction at a specific temperature,since its value depends upon the size, speed and types of molecules in the reaction
*TEMPERATURE is the only factor that affects the rate constant
REACTION ORDER
The order of reaction indicates how concentration of reactants affects the rate of reaction.
In a first order reaction, if the concentration of A were doubled, the rate would be doubled.If the concentration were tripled,the rate would be tripled.
Ex.
rate= k[A]²[B]³ then the overall order is 5

CALCULATING RATE ORDERS
The rate law can only be determined experimentally.Even the rate of formation of the products and the rate of consumption of reactants is related to their stoichiometry,the law cannot usually be determined from the molar coefficent.

RATE LAW AND STOICHIOMETRY
(base it on your copy,not that hard eniweys)

RATE LAW AND REACTION MECHANISM
(even this one we did this one already)
***Reminder: We will be having our test on wednesday and don't forget to answer the review sheet ok??!!!.
the next scribe would be sergio

Test Results...

Well im scribe today!!i hate doing This...ahh....well um Ms. K gave the test results awhile ago and it was 38 marks but at least i got a good mark...well um the question that most of us got the wrong answer was question number 8. and the question was ...You have two solutions.One is Green and the other is pink.When you mix the solutions together,a precipitate forms.the remaining solution is pink.Suggest two compounds that could give you these results.
And the answer for this question was
NiCl2 + Mn(OH)2 -----Ni(OH)2(s) + MnCl2

in which Nickel hyrdoxide gives you a precipitate and Manganese Chloride gives you the pink solution

And on Monday and Tuesday we will be doing some test about identifying compounds

and we will be observing and doing some stuff like...

1.Colour of the solutions(don't forget to put some o)

2.Odour(again)-waft vapours to your nose,don't smell it directly

3.flame test on tuesday

4. solubility of ions-ppt. forms

hydroxides-white ppt.

5.Litmus paper-if blue to red then it is acid and if it is red to blue,it is base

*reminder:don't contaminate your solutions and use only one pippette in each solutions..

keikei

the next scribe will be Jess