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Thoughts on your wiki Andrea_Law Andrea_Law 0 40 Dec 16, 2009 by Andrea_Law Andrea_Law
Method Bhargabi Bhargabi 0 67 Dec 10, 2009 by Bhargabi Bhargabi

LAB: Some Metals Are More Reactive Than Others



Aim: tomake a fair test using given materials to find out which of five metals; Iron, Magnesium, Copper, Aluminium and Zinc, will be more reactivity.

Variables in this lab:



What is the Variable?
How will it be changed?
How will it be measured?
How will we keep it the same?

Independent Variable

Metal used in this experiment, since there will be five of these metals all with some difference amongst them.
We are going to have the five different metals with us which will be: Iron, magnesium, Aluminium, Copper and Zinc.
Everytime we have to use different metal to test and examine them.
Dependent variable

In this lab we will measure the reactivity of the different types of metals.
We will use a camera to record what is happening and along with that have a stop watch to see how long it took for a reaction to occur, we will use a stopper for the test tubes to trap the gas.
Controlled Variable

The same amount of metals, 0.5 grams each.

The same liquid is used

Person adding water and solid, using the camera and looking at the stopwatch
Decide upon a fixed amount of the solid we are using every single time.

We will use the Hydrochloric acid every time we do the experiment.

We will sort out are jobs while doing the experiments.


Hypothesis:

If we have to predict the most reactive material of the three then, the most reactive will be Iron because it follows the pattern of the placement in the periodic table making it the most reactive. This is actually because the second furthest to the left the furthest one would be Magnesium but since it is in the 3rd row when magnesium is in 2nd, i think Iron would be most reactive.
Equipment:
  1. 5 Test Tubes
  2. Petri Dishes
  3. Scale
  4. Measuring Cylinders
  5. The 5 metals - 0.5 grams each
  6. Hydrochloric acid - 35 ml
  7. Camera
  8. Stop watch
  9. 5 Balloons for test tubes
  10. Test tube rack

Method:
  1. Pay close attention to safety by following the safety rule, like wearing glasses and coats on for protection because there will be metal pieces that will be as small dust pieces hence can damage eyes. One also has to be careful while you're doing the experiments about your hands since it might burn.
  2. Get equipment and materials, get the same amount of metals in 5 different petri dishes, one for each kind of metal, then measure it using a scale and make sure all of them are 0.5 grams.
  3. Make sure your equipment should be set to start the observations, a person can manage the camera while another is incharge of timing the reactions.
  4. Start of with one type of metal, Aluminium, move it from the petri dish to a test tube.
  5. Add the hydrochloric acid, 7ml to eah of the test tubes with the metal, then put a balloon on the test tube to see if the gas will expand hence will it take up more space due to the reaction.
  6. Start timing and give it till atleast 4 mins and at most 5 mins. Observe what's happening and think about why, take a video clip, when one has finished timing write down some quantitative observations.
  7. Repeat the same steps with the other metals.
  8. After repeating these steps with all the other metals, watch videos that you've made and write qualitative observations based on those video's, then move on to do the conclusion and evaluation.

Observation:
Type of metal
Rank of reactivity
Quantitative observations
Qualitative observation
Iron
4


Aluminium
3


Zinc
2


Magnesium
1

Most reacive compared to the other metals, reaction took place very fast and could be told to be most reactive because of the videos and how the reaction took place with alot of bubbles.
Copper
5
0.5g of copper added to 7ml of acid.


Conclusion:
This lab has successfully answered our aim. We found out which metal is the most reactive one. We thought that Iron would be the most reactive metal, and from the results we found out that it wasn’t right. We did this by putting 5 metals in the acid and covering test tubes with balloons. In our hypothesis, it said the Iron would be the most reactive metal, and we could see that Magnesium was the most reactive one in the experiment; Magnesium showed the best reactivity in hydrochloric acid. Then in the hypothesis, it said the Magnesium would show the best reactivity after Iron, but second one to react quickest was Zinc. This showed us that our hypothesis was not accurate.