Chemistry P31

[EpicLol]

ppl for the second last Q.
How can we measure the rate of reaction?
Measuring the voltage shown in the calibrated voltmeter....Will they mark it wrong any idea? :/

I put take the masses of the electrode to see how much was rusted and the time taken....I think I did it wrong though....

 

[sazzabazza]

ppl for the second last Q.
How can we measure the rate of reaction?
Measuring the voltage shown in the calibrated voltmeter....Will they mark it wrong any idea? :/

I said that you had to measure the time taken for the experiment as well as the mass of the rust deposited.

 

[EpicLol]

I said that you had to measure the time taken for the experiment as well as the mass of the rust deposited.

same here hope its correct

 

[Abu mota]

Initial mass and final mass. Rate is equal to change in mass divided by time

 

[Roselian]

I found it hard...but when I left the exam I got everything I though I'd get wrong right! Alhamdulillah.

Can you guys remember what was on each page? I want to revise my answers but I can't remember the questions, can one of you PM me please?

 

[MERIHAN]

The graph is gonna shoooooooooooot up and touch the sky!

INSHALLAH WHATEVER HAPPENS TO THE CURVE WE WILL GET AN A *

 

[L-Girl]

what are your thoughts for the grade threshold of chem this year?

 

[Saadiya Ahmed]

ppl for the second last Q.
How can we measure the rate of reaction?
Measuring the voltage shown in the calibrated voltmeter....Will they mark it wrong any idea? :/

I wrote the mass of the electode before an after the conduct of the experiment in a certain period of time...
But im nt sure if its right...i jst wrote it to fill the page! :/

 

[somaya]

ppl for the second last Q.
How can we measure the rate of reaction?
Measuring the voltage shown in the calibrated voltmeter....Will they mark it wrong any idea? :/

mass of rust divided by time taken 4 rust formation

 

[EpicLol]

what are your thoughts for the grade threshold of chem this year?

I think it will be like 65/80 or summin like that for an A and 170/200 or summin for A*

 

[EpicLol]

I wrote the mass of the electode before an after the conduct of the experiment in a certain period of time...
But im nt sure if its right...i jst wrote it to fill the page! :/

Yay I put the same

 

[sazzabazza]

what are your thoughts for the grade threshold of chem this year?

I think that it won't be higher than around 150-55. My teachers have been saying that the A* grade boundary never goes above 80% for any of the sciences.

 

[L-Girl]

what was the answer for the acid rain question?

 

[Saadiya Ahmed]

what was the answer for the acid rain question?

We jst had to write how SO2 and NO/NO2 are formed and how they combine with water to form sulphorus and nitrous acid and fall to earth as acid rain...

 

[Roselian]

what was the answer for the acid rain question?

I explained how nitrogen oxide and sulfur dioxide are formed, then I said how they react with water vapor to make weak acidic solution, then it is condensed in rain clouds and comes down as acid rain.

 

[BurakBurak]

I explained how nitrogen oxide and sulfur dioxide are formed, then I said how they react with water vapor to make weak acidic solution, then it is condensed in rain clouds and comes down as acid rain.

Same thing

 

[Saadiya Ahmed]

I explained how nitrogen oxide and sulfur dioxide are formed, then I said how they react with water vapor to make weak acidic solution, then it is condensed in rain clouds and comes down as acid rain.

That's exavtly what they asked!

 

[somaya]

I explained how nitrogen oxide and sulfur dioxide are formed, then I said how they react with water vapor to make weak acidic solution, then it is condensed in rain clouds and comes down as acid rain.

wt waz da ans 4 da addition of saltz in da rust question

 

[reya]

I hope it stays lower than like 175 coz higher than that then I might not get an A* in total

80+60+40=180 so 2 get A* may be u need to get 155-178 ! good luck . may be i can get an A

 

[BurakBurak]

wt waz da ans 4 da addition of saltz in da rust question

As a catalyst