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Practical 5: Properties of Compound

Experiment 1: Properties of A Compound and Its Parent Elements

Hypothesis
The hypothesis of this experiment is magnesium oxide can be synthesized by combining (burning) the magnesium with oxygen. The chemical and physical properties of each element (magnesium, oxygen, and magnesium oxide) might be different, from the state, color, electrical conductivity, and pH. Aim

This experiment was performed to synthesize magnesium oxide by direct combination of magnesium and oxygen and to compare the properties of the elements (magnesium and oxygen) in their elemental state with the properties of the compound of these elements (magnesium oxide). Introduction

When elements react to form compounds, their chemical and physical properties change. Their outer shells become complete (the octet rule) and the resultant compound is usually more stable. In this experiment, magnesium oxide will be synthesized by direct combination of magnesium with oxygen. The properties of magnesium, oxygen, and magnesium oxide will be tested and compared. The balanced chemical equation for this process is: Mg + O2 2MgO

Materials:
*
* Magnesium ribbon
* H2O (water)
* Tongs
* 250 ml beaker
* Test tubes
* 10 ml measuring cylinder
* Bunsen burner
* Safety glasses
* Stirring rod
* Universal indicator (include pH color chart)
* Electrolyte tester
* Stopper

Procedure
1. Observed and record the state, color, and the electrical conductivity of the magnesium ribbon and record the result. 2. Put 1 cm of magnesium ribbon into a beaker that was added with 10 ml of water (H2O) and added some drops of Universal Indicator (UI) into the test tube. 3. Observe and record the color result and pH.

4. Added 10 ml of water and few drops of Universal Indicator (UI) into the test tube. 5. Stopper before shook the test tube to inflate the water (H2O) with the oxygen (O2). 6. Record the color result and pH.

7. Took a pair of tongs, snapped the magnesium ribbon, and burnt it in a Bunsen burner flame, then moved the burning strip over a 250 ml beaker. After that, put the magnesium oxide (MgO) ashes into a beaker. On this step, please used the safety glasses to avoid the permanent eye damage and also do not looked directly at the burning magnesium. 8. Observe and record the state and color. Don’t forgot to also observe and record the electrical conductivity of the Magnesium Oxide (MgO) by using the electrolyte tester. 9. Added 10 ml of water and some drops of Universal Indicator (UI) into the beaker, then mixed with the stirring rod. 10. Observe and record the result color and pH.

Results
| Mg| O2| MgO|
State| Solid| Gas| Solid|
Color| Grey| Clear| Grey|
Electrical conductivity| High| None| None|
Color of water mixture added with Universal Indicator (UI)| Dark green| Light Green| Light purple| pH of water mixture| 9| 7| 11|

Analysis
Based on the results, magnesium oxide can be synthesized by combining (burning) the magnesium with oxygen. The chemical and physical properties such as the state, color, electrical conductivity, and pH are different for each element, except for the same state between magnesium and magnesium oxide and the same electrical conductivity between oxygen and magnesium oxide. Discussion

The experiment was successfully done and support the hypothesis based on the accuracy when the elements were being tested to found out some of the properties. Conclusion
The conclusion from the experiment is, magnesium oxide can be synthesized by combining magnesium and oxygen. From the combining or the burning itself, it produced some ashes that contained magnesium oxide, and became another state or changes. The properties of the new substance, magnesium oxide, were also different from magnesium or oxygen. The magnesium oxide did not had any electrical conductivity same like oxygen, while magnesium had...
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