1. Our Chemistry Project

2. Aluminium Facts silvery-white chemical lightest structure
corrosion resistant, heat reflective, excellent conductor of electricity
exceptional resistance to weathering and corrosion
Used for storage tanks and highway signs
easily recycled using less than 5% of the energy required to produced
virgin aluminium
it is very light

3. Properties of Aluminium
Symbol: Al
Atomic number: 13
Atomic Weight:
Group in period table: 111A
Density at 0 degree Celsius: 2.699
Boiling point: 2467 degree Celsius
Melting point: degree Celsius

4. Apparatus Aluminium Foil Test Tubes Hydrochloric Acid (dilute)
Copper Sulphate (powder form)
Weighing machine
Beakers
Test Tubes
Filter funnel
Burette
Stop Watches
Filter Paper
Distilled Water

5. kept the same Variables Variables Amount of hydrochloric acid
(5cm³, 0.5mol/dm³)
Pieces of aluminium foil (1)
Temperature (room temp.)
changed
Variables
Amount of copper sulphate

6. Experiment
Burette 5cm³ of HCl into the beaker and add in the aluminium foil
Observation: the reaction between HCl and Al is very slow and cannot be seen. Thus, copper sulphate, (a transition metal compound) is used to speed up the process.

7. Experiment
Burette 5cm³ of HCl into the beaker and add in 0.5g of copper sulphate and shake the mixture.
Put in the aluminium foil into the copper sulphate solution as we start the stop watch.
Observe the reaction between the metal and acid.
Record the time taken for the bubbles produced to subside.

8. Experiment
Observations: the aluminium foil immediately starts to decompose/rust. A hissing sound is heard due to the bubbles produced. Heat energy is also produced. The gas produced is hydrogen because
Metal + Acid ---> Salt + Hydrogen

9. Results Amt. Of Copper Sulphate (g)
5min 20s 3min54s 3min30s 3min3s 3min11s 3min10s 7min19s

10. Interpretation Limitation We have discovered that
~ If we add distilled water into the mixture, it slows down the reaction process.
~ If the amount of HCl increases, the reaction process is speeded up.
Limitation
We have found out that the limiting factor for this experiment is Hydrochloric acid.

11. Evaluation
As we increase the amount of copper sulphate, the rate of reaction between hydrochloric acid and aluminium speeds up too. Thus, more bubbles are produced, more hissing sound is heard and more heat is produced too.

12. Compton’s Encyclopedia CD-ROM
Reference
Compton’s Encyclopedia CD-ROM