Science Coursework B

kronsich

Hey guys

Working on coursework B with 3rd years at the moment. Finished the biology one but working on the chemistry one now. The kids are having trouble finding a procedure. Anyone know how to do it?

phish

what is the title?

rainbowtrout

Chemistry
Investigate and compare how the solubilities, in water, of (a) potassium chloride and (b) sodium carbonate (anhydrous) change with temperature.




In all seriousness and I don't say things like this too often on this forum, but I would be worried if a junior cert science teacher couldn't figure out how to do the experiment which is what the OP implies.

Pwpane

rainbowtrout wrote: »

Chemistry
Investigate and compare how the solubilities, in water, of (a) potassium chloride and (b) sodium carbonate (anhydrous) change with temperature.




In all seriousness and I don't say things like this too often on this forum, but I would be worried if a junior cert science teacher couldn't figure out how to do the experiment which is what the OP implies.

Especially when the experiment part of the syllabus. OP, try your textbook!

solerina

This is one of the easiest experiments they have given in years so you should have no problem if you open the Science book.

2011abc

Put 100mls or 200mls water in a beaker on a hotplate and stick in a thermometer and measure temperature.
Add one of named chemicals until no more dissolves while measuring its mass in grams.(Maybe use a scoop with known mass per scoopful)
Increase temp until 10 degrees higher -Add more (get mass) until it wont dissolve again
Repeat until water at boiling point .
Draw graph of results.

Pwpane

2011abc wrote: »

Put 100mls or 200mls water in a beaker on a hotplate and stick in a thermometer and measure temperature.
Add one of named chemicals until no more dissolves while measuring its mass in grams.(Maybe use a scoop with known mass per scoopful)
Increase temp until 10 degrees higher -Add more (get mass) until it wont dissolve again
Repeat until water at boiling point .
Draw graph of results.

Well done

Inspector Coptoor

I'll be starting them in January,
Wanted to finish the course first,

They are fairly strAight forward in bio & Chem.

kronsich

Wow. Forgot how bitchy teachers can be!

I'm well aware of the solutions and crystallisation chapter in the book! Was just wondering how others were doing it. I have 50 kids doin this at the moment so want to throw them a load of lab equipment and for them to pick their own procedure from internet research.

I was thinking of adding a load of the solutes, mixing, filtering and weighing the filter paper with the residues. Then so the same whilst increasing the temperature in a water bath. Bigger mass equals less soluble?

kronsich

Inspector Coptoor wrote: »

I'll be starting them in January,
Wanted to finish the course first,

They are fairly strAight forward in bio & Chem.

I've just electricity and water hardness to do. Decided to abandon the course and get coursework B done now. Giving exam questions for homework too. Then hopefully finish the course before the mocks in Feb.

rainbowtrout

kronsich wrote: »

Hey guys

Working on coursework B with 3rd years at the moment. Finished the biology one but working on the chemistry one now. The kids are having trouble finding a procedure. Anyone know how to do it?

kronsich wrote: »

Wow. Forgot how bitchy teachers can be!

I'm well aware of the solutions and crystallisation chapter in the book! Was just wondering how others were doing it. I have 50 kids doin this at the moment so want to throw them a load of lab equipment and for them to pick their own procedure from internet research.

I was thinking of adding a load of the solutes, mixing, filtering and weighing the filter paper with the residues. Then so the same whilst increasing the temperature in a water bath. Bigger mass equals less soluble?

Your OP would suggest that you didn't know how to do it. I couldn't take any other meaning from it.

Pwpane

kronsich wrote: »

Hey guys

Working on coursework B with 3rd years at the moment. Finished the biology one but working on the chemistry one now. The kids are having trouble finding a procedure. Anyone know how to do it?

kronsich wrote: »

Wow. Forgot how bitchy teachers can be!

I'm well aware of the solutions and crystallisation chapter in the book! Was just wondering how others were doing it. I have 50 kids doin this at the moment so want to throw them a load of lab equipment and for them to pick their own procedure from internet research.

I was thinking of adding a load of the solutes, mixing, filtering and weighing the filter paper with the residues. Then so the same whilst increasing the temperature in a water bath. Bigger mass equals less soluble?

How are the kids having trouble finding a procedure when there's a perfectly adequate one in their textbook?

Equally, if you want them to pick their own procedure from internet research, why are you designing an alternative detailed procedure - which is a little suspect?

Still not convinced that you're a teacher...

kronsich

Pwpane wrote: »

How are the kids having trouble finding a procedure when there's a perfectly adequate one in their textbook?

Equally, if you want them to pick their own procedure from internet research, why are you designing an alternative detailed procedure - which is a little suspect?

Still not convinced that you're a teacher...

I can live with that. Good look with the coursework lads!

Manutd_4life

Guys for the chemistry experiment, i'm having trouble thinking of some variables and controls. For variables, I've got changing the temperature and the amount of solute in the water. For controls all I've got is same volume of water.

Can't really think of any more. Any help!!!! Much appreciated!!!!

spurious

Manutd_4life wrote: »

Guys for the chemistry experiment, i'm having trouble thinking of some variables and controls. For variables, I've got changing the temperature and the amount of solute in the water. For controls all I've got is same volume of water.

Can't really think of any more. Any help!!!! Much appreciated!!!!

Not a Science teacher and not at all sure if this would fit in with the brief but could you use different types of water?
Tap, bottled still, bottled sparkling, rainwater?

Manutd_4life

spurious wrote: »

Not a Science teacher and not at all sure if this would fit in with the brief but could you use different types of water?
Tap, bottled still, bottled sparkling, rainwater?

No the experiment has nothing really to do with the types of water so no sorry. But thanks for trying anyway.

evolving_doors

Manutd_4life wrote: »

Guys for the chemistry experiment, i'm having trouble thinking of some variables and controls. For variables, I've got changing the temperature and the amount of solute in the water. For controls all I've got is same volume of water.

Can't really think of any more. Any help!!!! Much appreciated!!!!

Ah here.... Leave it out...OK folks...as per the maths forum I don't think we should give answers outright....

Socratic approach...or a few hints..

Magister Dixit

Inspector Coptoor

Controls:
Amount of distiller water used - 100cm3.
Amount of salt added per interval - 0.5g

Variables:
Temperature - 0 degrees C up to 60 degrees C in 10 degree increments
The saturation points of the two salts at the different temperatures.

Manutd_4life

Inspector Coptoor wrote: »

Controls:
Amount of distiller water used - 100cm3.
Amount of salt added per interval - 0.5g

Variables:
Temperature - 0 degrees C up to 60 degrees C in 10 degree increments
The saturation points of the two salts at the different temperatures.

Thanks for the answer:D.By the way we're using chemicals, not salt

Inspector Coptoor

Em.....

KCl is Potassium Chloride - a chemical that is a salt.

And
Na2CO3 is Sodium Carbonate, a chemical that is a salt.

There are thousands of salts, not just NaCl, (Sodium Chloride) that you put on your food.

Manutd_4life

Inspector Coptoor wrote: »

Em.....

KCl is Potassium Chloride - a chemical that is a salt.

And
Na2CO3 is Sodium Carbonate, a chemical that is a salt.

There are thousands of salts, not just NaCl, (Sodium Chloride) that you put on your food.

ooohhh smarty pants

rainbowtrout

Inspector Coptoor wrote: »

Em.....

KCl is Potassium Chloride - a chemical that is a salt.

And
Na2CO3 is Sodium Carbonate, a chemical that is a salt.

There are thousands of salts, not just NaCl, (Sodium Chloride) that you put on your food.

It's quite worrying that you had to explain this..... :eek:

RealJohn

I have a sneaking suspicion that Mr. 4life is a student, not a teacher. Definitely not a chemistry teacher anyway.

2011abc

Maybe he works for the Department !One of the (now promoted) manbag wielding legends from the infamous 'fly on the wall ' ' show' .Then again he appears to know too much about education for that !
Theres increasing evidence I find of staff in political offices posting online to support their overlords causes .Pretty sad stuff !But seriously its gotta be a student -not knowing theres more than one kind of 'salt' -sheesh!

kronsich

Hey

I've finished mine now.

Controls: I had stirring time, volume of water, same amount of solute added every time. Didn't change the water source, stuck to tap water.

Variables: temperature changed, amount of solute that dissolved changed with increasing temp. I separated this into dependent and independent variables.