AQA chemistry ISA sports injury packs

I am really stuck on the method part of this ISA. Could anyone please give me a hypothesis and method?

(edited 10 years ago)

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You are likely to investigate an endothermic dissolving process. If certain compounds like potassium choride are dissolved in water then the temperature falls - endothermic.

So how about this hypothesis: The higher the mass of potassium cholride added to the water, the lower the temperature gets.

You will need to think about CVs (like vol of water?), IV and DV for your hypothesis.

Hope this helps.
ChemGuy

Reply 2

scrawlx101

anything else for the method? really hard to find info on this.

Reply 3

ssingh98

My variable is sodium nitrate instead of potassium chloride. will temperature increase or decrease for sodium nitrate when it reacts with water. And Why??

Reply 4

scrawlx101

why isnt there much to go on?

Reply 5

ssingh98

its really hard to find stuff, I have got paper 1 tomorrow, any idea what the questions will be on??

Reply 6

jordansteves

i have the same, your basically looking for how the size of a injury pack can be reduced and by doing so you can experiment with salt and water. simply take 5 different measurements of salt and pour them in 5 different beakers, add the same amount of water then measure the temperature. look at your results and link it back.

Reply 7

ineedhelp98

what was on paper 1?? :smile:

Reply 8

scrawlx101

asks about 2 hypothesis,which was better
perlimnary tests-what did u do to make sure the variable you measured was right?
writing about the method-dont forget units and fair test-dont just say to make it fair say it will affect your results
your asked about variables too

Don't worry trust me.You'll wing it if you planned well :smile:

is this gcse?

Original post by Student B

I am really stuck on the method part of this ISA. Could anyone please give me a hypothesis and method?

Try this

Add three spoonfulls of salt to 25cm cubed of water in a small beaker. Stir with a thermometer and take note of the temperature. Keep adding a higher mass of salt each time and take note of the temperature change.

Hope this helps :biggrin:

Reply 11

degu111

Original post by Student B

I am really stuck on the method part of this ISA. Could anyone please give me a hypothesis and method?

This is the full method I used :smile:

Hope it helps :biggrin:

Materials:

•

Thermometer

•

Room temperature water

•

Four grams Epsom salts

•

Spoon

•

Glass beaker

•

Thermometer

•

Pen or pencil

•

Paper

Safety concerns:

Be sure to keep all glassware, and chemical safety rules. As with all science lab activities, the most important safety rule is to follow all teacher directions.

Procedure:

Fill the beaker half full of room temperature water.

Carefully, put the thermometer in the water.

Allow the thermometer to reach a stable temperature (about one minute) then record the temperature of the water.

Carefully stir in the Epsom salts.

Record your observations.

Check the thermometer and record the temperature of the liquid each minute.

Continue to record the temperature until it becomes stable (does not keep changing.)

Analysis:

How does the water temperature compare after the Epson salts are added to the water?

Why might Epson salts affect water temperature?

What type of a change does this demonstrate (physical or chemical?)

Does the temperature continue to change after the Epson salts are added to water?

How long does it take for the temperature to stabilize?

Reply 12

Treehouses

what if i change the volume of water instead

Reply 13

username1210827

Has anyone done paper 2? I'm not asking for the questions, just wanted to know how it went as I have paper 2 tomorrow

What is the context?

Original post by fizarock22

What is the context?

My school gave us a context. Which was just that sports companies could use the results of this investigation to find out the amount of NH4NO3 needed for a sports injury pack

Reply 16

fizarock22

Original post by the-anonymous-me

My school gave us a context. Which was just that sports companies could use the results of this investigation to find out the amount of NH4NO3 needed for a sports injury pack

Yeah they gave me this as well

Reply 17

KongShou

So i got 40/50 for this isa desipt being quite good at chemistry and get 90+% regularily in mocks. Is that a good score? Can I still archive an A*?

Reply 18

username1210827

Original post by KongShou

So i got 40/50 for this isa desipt being quite good at chemistry and get 90+% regularily in mocks. Is that a good score? Can I still archive an A*?

Well the ISA is only 25% of your overall grade I know someone who got 100 UMS in his ISA and Modules 1&2 so when he walked into module 3 he just needed a C in it to get an A* overall

Reply 19

KongShou

Original post by the-anonymous-me

Well the ISA is only 25% of your overall grade I know someone who got 100 UMS in his ISA and Modules 1&2 so when he walked into module 3 he just needed a C in it to get an A* overall