Temperature Effect the Rate of A Chemical Reaction Portfolio

C.E.G. Science Skills assessment Portfolio – Engineers.Portfolio
Task 1.
800 words, 5 references exactly and it is better to be in the definitions, no similarity
The rate at which a chemical reaction proceeds depends on
o Temperature
(How temperature effect the rate of reaction)
Na2S2O3 + 2HCl
2NaCl + SO2 + S + H2O
what is the mean of the (aim of experiment) definition:
– what is the mean of (introduction of experiment) definition:
– the aim of the chosen experiment
– the introduction of the chosen experiment
– define what is the mean of experiment materials ( one or two sentences enough)
-list the materials of the experiment and what the use of them?
-define what is the mean by experiment procedure
write the procedure of the experiment step by step (in the passive voice this is very important)
– write the three types of variables:
1-independent variable
2-dependent variable
3- control variable
And define each type of variables, then write what was the variables( independent , dependent and
control) in your experiment

Define risk assessment
What is safety precautions
Write a list with general safety rules and write specific safety rules that belong to your
Put some poster of hazard signs and define it with some words
Notes : you should put a diagram of the experiment from the internet.
C.E.G. Science Skills assessment Portfolio – Engineers.
Task 2
• Define experimental errors
• How to Identify errors
• How to classify errors – systematic, random and
parallex with definition and (giving examples of each)
The examples should be a table with numbers you do it
(don’t copy paste from internet) and explain where is
the error.
• How to identify anomalies and how to deal with them
(giving examples)
The example is a table(about the same experiment in
task one temperature and effect on reaction rate) you
do it (not from the net) with an anomalies point, and
then do a graph to show the anomalies point, after
that, explain how to deal with it (for example if you
C.E.G. Science Skills assessment Portfolio – Engineers.
need to calculate the meant of the rates at different
temp how to deal with anomalies).
• How to mathematically analyse errors:
o What do we mean by absolute and percentage
error (relative error), how would these be
o Giving examples, show how to: add / subtract
/ multiply/ divide quantities with errors stated
o Explain how to calculate the error when you
have a repeated measurement. Give an
example to illustrate your explanation
o Explain how to calculate the error when
multiple quantities are substituted into an
equation. Give an example to illustrate your
• Assessing the reliability of data
• The impact of errors on experimental conclusions
Task 2 – Word Count =
5-References exactly
C.E.G. Science Skills assessment Portfolio – Engineers.
Task 3 Part A
Investigates how the temperature effect the rate of the reaction in.
Na2S2O3 + 2HCl
2NaCl + SO2 + S + H2O
in this part you should talk about the experiment in reflective way . What is done in the
correct way and what is done in the wrong way and how to improve yourself in different
Task 3 Part B
Positive Aspects

Choice of apparatus (what apparatus was good or suitable. for example, you can say
this thing is good because it is precise or cheap or any positive thing)

Procedure outlined

Safety considerations
Negative Aspects

Choice of apparatus ( what apparatus wasn’t good or suitable)
Procedure outlined
Safety considerations
Task 3 Part C
Suggestions for improvement should include comments regarding the:
• Apparatus used (for example what you would change next time to improve)
• Procedure (what is the difference in method that will make the experiment better)
• Safety considerations (what safety that you should do but you didn’t)
Task 3 Part D
examples of further work
you should write about further work you do about this experiment.
C.E.G. Science Skills assessment Portfolio – Engineers.
5 References exactly
Task 3 – Word Count =
Skills – Engineering Pathway
Term 2 Assessment 2 – Uncertainty
Convert the following to relative uncertainties:
a. 2.70 ± 0.05 cm
b. 12.02 ± 0.08 cm
Convert the following to absolute uncertainties:
a. 3.5 cm ± 10 %
b. 16 s ± 8 %
Complete the following, determining the appropriate uncertainty:
a. (2.70 ±0.05 cm) + (12.02 ± 0.08 cm)
b. (2.70 ± 0.05 cm) − (12.02 ± 0.08 cm)
c. (2.70 ± 0.05 cm) + (3.5 cm ± 10 %)
Complete the following, determining the appropriate uncertainty:
a. (2.70 ± 0.05 cm) × (12.02 ± 0.08 cm)
b. (12.02 ± 0.08 cm) ÷ (16 s ± 8 %)
c. (3.5 cm ± 10 %) × (2.70 ± 0.05 cm) ÷ (16 s ± 8 %)
Complete the following, determining the appropriate uncertainty:
a. 2 × (2.70 ±0.05 cm)
b. 2 × (16 s ± 8 %)
c. (12.02 ± 0.08 cm)2
Complete the following determining the appropriate uncertainty:
a. (12.02 ± 0.08 cm)2 ÷ (3.5 cm ± 10 %)
b. (12.02 ± 0.08 cm)2 + (3.5 cm ± 10 %) × (2.70 ± 0.05 cm)
c. [(3.5 cm ± 10%) + (2.70 ± 0.05 cm)] / (16 s ± 8%)
d. 4π2 /(0.034 ±0.004 s2/cm)
Determine the perimeter and area of a rectangle of length 9.2
± 0.05 cm and width 4.33 ± 0.01 cm.

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