Chemistry GCSE ISA!! Help!!

Someone please give me the questions and answers for section 2

Paper 2 Possible Chem ISA (Questions with answers)

What were the variables in the investigation you did?

Independent variable - Temperature of solution (degrees Celsius)
Dependant variable - Time taken for cross (X) to disappear in seconds
One Control variable was - The molar of hydrochloric acid

If you had been able to use another value of this variable, either within or outside the range, what value would you have chosen?

I would have chosen 10 degrees Celsius, as it is in the middle of 20 degrees Celsius and 0 degrees Celsius. 20 degrees Celsius is a bit off the line, so doing 10 degrees Celsius would have helped check this.

Do your results support the hypothesis?

My results support the hypothesis given. As I increase the temperature from 0 degrees Celsius to 20 degrees Celsius, the average time taken for the cross to disappear decreased from 310 seconds to 200 seconds. This proves that as you increase the temperature, the less time it takes for the cross (X) to disappear.

Did you repeat any of the measurements in the investigation?

I did not repeat any measurements. Instead, I removed all anomalous results and calculated a mean. I removed anomalous results to eliminate all extreme values which would decrease the accuracy and precision of my results. I calculated a mean by adding up all of the results (excluding any anomalous ones), and dividing by the number of results.

What could be an uncertainty?

An uncertainty could be that different people are looking for different end points, which would make your results less precise. You could keep the person looking for the end points the same, which would mean the same end points are looked for, thus eliminating this uncertainty.

Are your results reproducible?

(Explain why as temperature is increase, rate of reaction increases also using an alternative method)

Paper 2 Possible Chem ISA (Questions with answers)

What were the variables in the investigation you did?

Independent variable - Temperature of solution (degrees Celsius)
Dependant variable - Time taken for cross (X) to disappear in seconds
One Control variable was - The molar of hydrochloric acid

If you had been able to use another value of this variable, either within or outside the range, what value would you have chosen?

I would have chosen 10 degrees Celsius, as it is in the middle of 20 degrees Celsius and 0 degrees Celsius. 20 degrees Celsius is a bit off the line, so doing 10 degrees Celsius would have helped check this.

Do your results support the hypothesis?

My results support the hypothesis given. As I increase the temperature from 0 degrees Celsius to 20 degrees Celsius, the average time taken for the cross to disappear decreased from 310 seconds to 200 seconds. This proves that as you increase the temperature, the less time it takes for the cross (X) to disappear.

Did you repeat any of the measurements in the investigation?

I did not repeat any measurements. Instead, I removed all anomalous results and calculated a mean. I removed anomalous results to eliminate all extreme values which would decrease the accuracy and precision of my results. I calculated a mean by adding up all of the results (excluding any anomalous ones), and dividing by the number of results.

What could be an uncertainty?

An uncertainty could be that different people are looking for different end points, which would make your results less precise. You could keep the person looking for the end points the same, which would mean the same end points are looked for, thus eliminating this uncertainty.

Are your results reproducible?

(Explain why as temperature is increase, rate of reaction increases also using an alternative method)

Hiya,

Paper 2:
Know your science definitions/key words

Have your results table handy to quote examples (you must quote to get 3 marks).

Know the range of your independent variable and why this range was useful or not.

Read the case studies really closely- the question on case study 4 is a bit confusing as it has lots of information.

Thanks I had it it was quite confusing to be honest! but hopefully i wish I get the grade i want!

Thank you!! I will definitely look and read that topic in particular up!!

I didnt write about collision theory in the context question. I said about how more produced in same time so more profit etc. Cost of increased temp less than saving made by increase rate etc. Is that 2 mks worth

Can you respond to my pm please thanks