Internet/literature source, Analysis and Conclusion ... · Internet/literature source, Analysis and...

Internet/literature source, Analysis and Conclusion

Candidate A

National 5 Chemistry Assignment 2017 Workshop 2 - evidence

SQA | www.understandingstandards.org.uk 1 of 26

Analysis:

Marks Grid

Skills & KU Max mark

Mark awarded

Comments

3 Data collection

and handling

(e) Data relevant to

the experiment

from an

internet/literature

source.

1

(f) A reference for the

source of the

internet/literature

data.

1

5 Analysis A valid

comparison of the experimental data with data from the internet/literature source.

1

1 A-type mark

6 Conclusion A valid conclusion

that relates to the aim and is supported by the data in the report.

1



Candidate B







Marks Grid


Mark awarded

Comments

3 Data collection

and handling


the experiment

from an

internet/literature

source.

1


source of the

internet/literature

data.

1

5 Analysis A valid


1

1 A-type mark



1



Candidate C



Internet/ literature source



Marks Grid


Mark awarded

Comments

3 Data collection

and handling


the experiment

from an

internet/literature

source.

1


source of the

internet/literature

data.

1

5 Analysis A valid


1

1 A-type mark



1



Candidate D









Marks Grid


Mark awarded

Comments

3 Data collection

and handling


the experiment

from an

internet/literature

source.

1


source of the

internet/literature

data.

1

5 Analysis A valid


1

1 A-type mark



1



Candidate E





Marks Grid


Mark awarded

Comments

3 Data collection

and handling


the experiment

from an

internet/literature

source.

1


source of the

internet/literature

data.

1

5 Analysis A valid


1

1 A-type mark



1



[Blank Page]



Evaluation

Candidate A

Aim- To find out which two chemicals give the greatest decrease in temperature for use in ice packs. We measured the temperature, added the chemicals and measured temperature again.

Name of chemicals Starting temperature End temperature

Ammonium nitrate + water+ carbolic acid

20.5 20.2

19.6 19.3

Citrus acid + sodium hydroxide + water

20.0 19.3

19.0 18.4

Urea + water 19.1 21.1

19.1 20.2

Barium hydroxide + water

20.2 19.9

18.5 18.1

Name of chemicals Average starting

temperature Average end temperature


20.35 19.45


19.65 18.7

Urea + water 21.5 20.5

Barium hydroxide + water

20.05 18.3

Name of chemicals Average temperature change


0.9


0.95

Urea + water 1.0

Barium hydroxide + water 1.75

Our results were quite accurate because we used an electric thermometer. We only tested four mixtures- we should do more different mixtures.



Marks Grid


Mark awarded

Comments

7 Evaluation

An evaluation of the experimental procedure. Factor Action /

evidence

2

1 A-type mark



Candidate B



Marks Grid


Mark awarded

Comments

7 Evaluation


evidence

2

1 A-type mark



Candidate C



Marks Grid


Mark awarded

Comments

7 Evaluation


evidence

2

1 A-type mark



Candidate D

Aim: To investigate the effect of fertilisers on the pH of soil I put fertilisers in a beaker with soil and water and measured PH before and after.

Name of

fertiliser PH of soil before adding fertiliser

PH of soil

(with added

fertiliser)

after Phostrogen plant food

5 6

Blood, fish

&bone

5 6

Slow release 5 6

Tomorite 5 7

Miracle grow 5 9

This experiment is accurate as I was the person who carried the experiment out therefore I know that the results are fair and right. The experiment was carried out in clean equipment which meant that the testing was fair and the same amount of soil (20g) and fertiliser (5 grams) was used every time meaning that the results would be clear. The results are good because I have concordant results except miracle grow that I would do again if I had time.

Marks Grid


Mark awarded

Comments

7 Evaluation


evidence

2

1 A-type mark



Candidate E

Aim: To find out which type of bottled water contains the most calcium Method: Samples of different bottled waters were titrated with EDTA

Bottled water 1 2 3 4 5 6 7 8 Average titre / cm3

Deeside 1.8 2.4 1.5 2.9 2.0 1.1 3.1 2.0 2.0

Evian 7.2 6.5 7.1 7.15

Highland Spring 6.6 7.1 6.3 6.9 6.0 6.2 6.1

The colour kept changing almost straight away in these experiments so it was really difficult to stop soon enough so our results kept going up and down. It was really difficult to add such small volumes of EDTA. The experiment would be better if we had a better burette or we could use bigger water samples so you wouldn’t have to add such small amounts or we could use weaker EDTA solution.

Marks Grid


Mark awarded

Comments

7 Evaluation


evidence

2

1 A-type mark



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