LAB: Some Metals Are More Reactive Than Others
Aim: to know how the 5 kind of metal (zinc, aluminium, steel, and magnesium, copper) reacts to 1 maul acid hydro chloride
Variable :


What is the Variable?
How? (Will you manipulate? Control it?)
Independent Variable
Type of metal (zinc, aluminium, steel, and magnesium, copper)
Use the same size and weight of metal
Dependent Variable
The weight of the left over
external image insert_table.gif
Use the scientific scale and measure the weight
Controls/ Constants
Weight of the metal
Need to have the same weight of metal
Amount of acid
Use scientific scale to measure the amount of acid




Hypothesis:
If reactive metals like Magessium is dropped into the acid
Then the metal will react with the acid
Because Magnessium is a reactive element, it sits in the middle of the periodic table unlike the noble elements on the sides.

Equipment and materials:


Zinc
Aluminium
Steel
Magnesium
Copper
Hydrochloric acid (100ml)
5~9 beakers

Electronic scale
Timer

Method


1. First gather the material required
2. Pour 10ml of hydrochloride acid to a small beaker
3. Measure the weight of the small beaker with the hydrochloride acid
4. choose one type of metal ( chunk or powder)
5. Before adding the metal the measure the weight of the metal
6. Add the metal to the hydrochloride acid
7. Wait for 2 minutes
8. Measure the weight of the beaker
9. Minus the weight before the reaction to after reaction (before reaction - after reation)
10. Do for other metal

Diagram of Apparatus:
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Observations:
How different metals react to Hydrochloric Acid (HCl)
Metal
Weight (HCl)
Weight (Metal)
Total (Before)
Total (After)
Observations
Fe(Iron)
29.54g
0.5g
30.04g
30.04g
- Didn’t dissolve.
- Some still floating on top.
- No Heat
- Kept all properties

Al (Aluminum)
28.62g
0.5g
29.12g
29.12g
- Didn’t dissolve.
- No Heat
- Kept all properties

Zn (Zinc)
2.12g
0.5g
28.62g
25.65
- Dissolved Quickly
- Some Heat
- Bubbling
- Some Floating
- Steam

Mg (Magnesium)
26.38g
0.5g
26.88g
26.83g
- Dissolved rapidly and intensely
- Lots of Heat
- Streams of bubbles
- Lots of Steam
- Sticks to each other after reaction

Cu (Copper)
28.40g
0.5g
28.90g
28.90g
- Didn’t dissolve
- Some Floating on top
- Kept all properties

Conclusion:
When we tested the five metals, only some reacted, others didn’t so metals do not react very well with HCl. Our hypothesis do support our results since only elements in the center of the periodic table react to the acid. Metals sitting towards the sides of the periodic table is more likely to react to other substance since it is not in an octet. So when we dropped elements like magnesium in we get a lot of reaction. We know it is a reaction because a reaction will either produce heat and light. Magnesium when burned, processes light. When dropped in acid, produces heat.

Ranking of the Most reactive Metals:
1. Magnesium (Mg)
2. Zinc (Zn)
3. Aluminium
4. Copper
5. Iron

Evaluation

Data of this experiment is very reliable. There are 3 reasons to it. The first reason is because this experiment has a good method. It has a good method because it contains all the information and step required to precede the experiment well. Also in this experiment the dependent variable is measured by a scientific scale. Therefore it can measure to two decimal points. The last reason is because the entire controlled variable is controlled by an exact way such as using test tube to measure the weight and others.

The Method could create reliable data but isn’t valid. The reason this could be said is because the method missed some step such as with what to measure and lots of others. Also this method didn’t even said to make an observation. As a conclusion this method is not valid


weakness
How to improve
The timing of measuring the weight. When I should measure the weight at exactly 2 minutes I missed the timing
To fix such a problem would be easy if this test is done more than one time.
The spoid. The spoid I used for HCl was not a clean one. The spoid I used was one that had water on it.
Use a clean spoid nextime