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
experiment.
Put some poster of hazard signs and define it with some words
Notes : you should put a diagram of the experiment from the internet.
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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
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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
calculated?
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
explanation.
• Assessing the reliability of data
• The impact of errors on experimental conclusions
Task 2 – Word Count =
800
5-References exactly
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C.E.G. Science Skills assessment Portfolio – Engineers.
Task3
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
aspects.
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.
.
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C.E.G. Science Skills assessment Portfolio – Engineers.
5 References exactly
Task 3 – Word Count =
700
References:
5
Skills – Engineering Pathway
Term 2 Assessment 2 – Uncertainty
1.
Convert the following to relative uncertainties:
a. 2.70 ± 0.05 cm
b. 12.02 ± 0.08 cm
2.
Convert the following to absolute uncertainties:
a. 3.5 cm ± 10 %
b. 16 s ± 8 %
3.
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 %)
4.
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 %)
5.
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
6.
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)
7.
Determine the perimeter and area of a rectangle of length 9.2
± 0.05 cm and width 4.33 ± 0.01 cm.