Prelim Prac Assessment. Help needed pl0x. (1 Viewer)

[Derkk]

Alright so I got a prac assessment this coming Monday and I need some help of what to do, what this prac might be about and what I should study.

My teacher only gave me some info on the prac. There is going to be somewhat two stations.

Station One- It will be about testing precipitation I think. He said it will involve cations and anions in dropper bottles testing for precipitates. We also have to write the balanced net ionic equation for the precipitated ones. Also the results will be tabulated, I will probably have to draw up my own table. Can someone help with what goes where in the table etc.

Station Two- This is where I really am unsure, my teacher said it will involve some graphing, but I don't know what the graphing will be. Whether related to the previous experiment or not. I need help on how to graph properly, it will be a line graph. But I have problems will differentiating between in/discrete data. Possibly will I have to explain some sort of trend?

Has anyone done anything similar to this? Could you please reply with how you did it and how it helps etc.

Thanks heaps.

 

[dekimasu]

You're doing prelim course right? (if I can believe your userbox, but whatever). Don't stress. Its prelim. Dosen't count.

The test is probably based on the mandatory pracs for the Chemistry course becuase that kills two birds with one stone. You can find all the mandatory pracs in the the syllabus (you can find this on the board of studies web site). Pracs are in the third column. Also, have a look at HSC Online - they have summaries of each prac on their website.

 

[maplestory]

Alright so I got a prac assessment this coming Monday and I need some help of what to do, what this prac might be about and what I should study.

My teacher only gave me some info on the prac. There is going to be somewhat two stations.

Station One- It will be about testing precipitation I think. He said it will involve cations and anions in dropper bottles testing for precipitates. We also have to write the balanced net ionic equation for the precipitated ones. Also the results will be tabulated, I will probably have to draw up my own table. Can someone help with what goes where in the table etc.

Station Two- This is where I really am unsure, my teacher said it will involve some graphing, but I don't know what the graphing will be. Whether related to the previous experiment or not. I need help on how to graph properly, it will be a line graph. But I have problems will differentiating between in/discrete data. Possibly will I have to explain some sort of trend?

Has anyone done anything similar to this? Could you please reply with how you did it and how it helps etc.

Thanks heaps.

I think i have done this prac. (section 1)
that's the dot point >>> perform a first hand investigation using micro technique to compare the solubility of appropriate salts in solution through precipation reaction

umm .... do u wanna know what i did? like materials &methods ??
reply me then.... i'll help the best i can

 

[Derkk]

Yes please. Any help is greatly appreciated.
Thanks.

 

[maplestory]

Yes please. Any help is greatly appreciated.
Thanks.

Materials: -Transparent film
-chemicals that contain cations: sodium nitrate, silver nitrate, lead nitrate, ammonium nitrate, magnesium sulfate, iron II sulfate, copper II sulfate, zinc sulfate, aluminuium sulfate, barium cholride, calcium chloride, iron III chloride
-chemicals that contain anions: potassium nitrate, potassium chloride, sodium chloride, sodium carbonate, sodium acetate, sodium hydroxide

risks: usage of acids-can cause corrosion-handle with caution, safety goggles, gloves

method:
1.draw a table using a permanent marker on the film
2.place one drop of each anion along the first row
3.add one drop of the first cation to each of the anions. record the results
4. repeat until all cations have been tested

then write ionic equations: eg. Ba (2+)(aq) + SO4 (2-)(aq) ---> BaSO4(s) ... bla..bla

then discuss like: all nitrates and acetates are soluble
all chlorides are soluble except AgCl & PbCl2
bla ... bla...

errors & improvements: eg. inproper amount of chemicals - sholud weigh and set proper weight

**if precipitate is formed, it is insoluble**

conclusion: If the precipation is formed in a reaction, then the solution is insoluble

xx xx xx
does it make sense?
hope it helps
=)