Which Energy Change Occurs During The Burning Of Magnesium Ribbon

Called-for Magnesium

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The property displayed in this sit-in uses magnesium metal to display what happens to metal when information technology reacts with oxygen gas, that is found in the air around us. Magnesium metal and its alloys are explosive hazards; they are highly flammable in their pure course when molten or in pulverisation or in ribbon form. Called-for or molten magnesium metal reacts violently with water. When working with powdered magnesium, safety glasses with welding middle protection are employed, because the vivid white lite produced by called-for magnesium contains ultraviolet light that tin can permanently damage optics.

Called-for Magnesium

Reaction

When magnesium is in its metallic form it volition burn very easily in air. However, in society to beginning the reaction (the burning) the magnesium metal needs a source of free energy. The flame provides a source of heat so that the magnesium metal atoms can overcome their activation energy. Activation energy is the minimum energy required in order for a chemical reaction to proceed. When the magnesium metal burns it reacts with oxygen found in the air to form Magnesium Oxide. A compound is a cloth in which atoms of different elements are bonded to 1 some other. Oxygen and magnesium combine in a chemical reaction to class this compound. After it burns, it forms a white powder of the magnesium oxide. Magnesium gives up ii electrons to oxygen atoms to form this powdery product. This is an exothermic reaction. An exothermic reaction is a term that describes a chemical reaction in which there is a net release of energy (heat).

\[2 Mg_{(s)} + O_{2 \;(g)} \rightarrow 2 MgO_{ (due south)} + \text{free energy} \tag{1}\]

Magnesium is also capable of reducing water to the highly-flammable hydrogen gas, which will be ignited by the excess heat given by the reduction reaction.

\[Mg_{(southward)} + 2H_2O \rightarrow Mg(OH)_{two\; (s)} + H_{2 \;(k)} \tag{2}\]

Magnesium also reacts with carbon dioxide to course magnesium oxide and carbon:

\[Mg_{(s)} + CO_2 \rightarrow 2 MgO_{(s)} + C_{(s)} \tag{three}\]

Hence, carbon dioxide fire extinguishers cannot exist used for extinguishing magnesium fires either. Burning magnesium is unremarkably quenched past using a Class D dry chemical burn down extinguisher, or past covering the burn down with sand to remove its air source.

Materials

strip of magnesium metal ribbon - 4 inches long
lighter

Directions

Agree the piece of magnesium metal ribbon in a pair of tongs.
Accept the lighter and hold the magnesium metallic ribbon in the hottest part of the flame.
It will before long grab burn down and emit a very bright light.
Circumspection DO NOT LOOK Directly AT THE BRIGHT Calorie-free. Briefly gaze at the light out of the corner of your center.

Rubber

Vesture goggles.
Do non let children practise this.
Do non expect directly at the light emitted from the metal.
Brand sure you agree the metal securely with the tongs.
Go along away from combustible materials.

Call back that water cannot extinguish magnesium fires and volition produce hydrogen gas (\(H_2\)) that volition simply intensify the fire. Vesture goggles that filter out UV light. Throw the pulverisation in the garbage.

References

Shakhashiri, Bassam Z. "Chemical Demonstrations", U. Wisconsin Press, 1983,Vol. 1, p.38.
http://www.angelo.edu/faculty/kboudr..._magnesium.htm
http://world wide web.newton.dep.anl.gov/askasc.../chem03362.htm
Driscoll, Jerry A. "Sit-in of burning magnesium and dry out ice (TD)." J. Chem. Educ. 1978, 55, 450.
Feinstein, H. I. "Ignition of magnesium in porcelain." J. Chem. Educ. 1982, 59, 159.
Laing, Michael. "A Alarm: Explosion Hazards of Reacting Magnesium and Aluminum with Powdered Silverish Nitrate (LTE)." J. Chem. Educ. 1994, 71, 270.
Moyer, Ralph O. "Synthesis and construction of magnesium oxide or calcium oxide. An integrated inorganic-concrete experiment." J. Chem. Educ. 1975, 52, 612.