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Why must the surface coating of Magnesium Oxide be removed prior to determining the mass of magnesium used in the experiment?
Wiki User
∙ 13y ago
To eliminate the extra weight of the oxygen atoms in the magnesium oxide.
Wiki User
∙ 13y ago
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What happens when magnesium ribbon is burnt in air?
Magnesium is an extremely reactive metal. When stored, it reacts with oxygen to form a layer of magnesium oxide on its surface. This layer of magnesium oxide is quite stable and prevents further reaction of magnesium with oxygen. The magnesium ribbon is cleaned by sand paper for removing this layer so that the underlying metal can be exposed to air.
What creates soap scum?
Most soaps contain sodium and potassium salts of fatty acids. These are water soluble compounds that help carry away oils and other water insoluble substances. Soap scum forms when these salts react with calcium and magnesium compound in the water. The newly formed calcium and magnesium salts are insoluble in water,and so forma coating on surfaces. This is more likely to happen if you have hard water, water rich in calcium and magnesium.
If the surface of the Mg ribbon you used were covered with thin oxide coating prior to the reaction would your mass percent calculation of magnesium be too high or too low explain?
higher..
A strip of magnesium metal into a solution of copper sulfate?
When we did it the other day what happened was this: the magnesium caused tiny bubbles and little dots of black fell to the bottom of the test tube (Copper I guess). When the reaction stopped, the liquid was still blue. We tried heating the mixture and got a bit more bubbles and 'dots' then we left the test tube for several days. Now the magnesium is coated with a pretty turquise coating of something, the solution is still blue, the dots are still black at the bottom of the tube. So CuSO4 + H2O + Mg should give you MgSO4 (which is soluble) and Cu. I do not know what we have actually got. The chemicals came from a chemistry set...the CaOH was equally not 'right' or rather it was far less 'basic' that I expected hmmm.
What are the products when metals react with strong acids?
Usually, an acid reacts with a metal to form a metal salt and hydrogen. However this depends if the metal is reactive or not. For example, magnesium, (Mg) is a violently reactive metal to hydrochloric acid; therefore, making magnesium chloride and hydrogen:Magnesium+Hydrochloric acid=Magnesium chloride+HydrogenAlso, if an experiment takes place, between a metal and a acid, bubbles will appear showing hydrogen. But remember, only with reactive metals!However, if the metal is nonreactive it will not react with dilute acids such as;sulfuric acid, hydrochloric acid and nitric acid. Take copper for example. Copper is nonreactive to dilute acids. However, a brief reaction still takes place, but not all the copper will react. When the reaction takes place a layer of either copper sulfate, copper chloride, or copper nitrate will form between the dilute acid and the copper. Not all the copper has reacted, (only a layer). This layer with the remaining copper is insoluble in water, and quickly forms a coating around the copper which prevents further attacks from acids. You can also know if metals are nonreactive or reactive, by looking at the reactivity series. They go in order starting with the most reactive.Most reactive1. Potassium2. Sodium3. Calcium4.magnesium5.aluminum6.Zinc7.IronLeast reactive8. Tin9. Lead10. Copper11. Silver12. Gold13. PlatinumRead more: What_is_formed_when_an_acid_reacts_with_a_metal
What is the coating on a magnesium strip?
Magnesium oxide. It's produced by magnesium reacting with oxygen.
Why is there a need to scrape the magnesium ribbon before heating?
Magnesium readily reacts with air, so by scraping it you are removing this coating of air. This isimportantto make your experiment more accurate.
Does the coating on a magnesium strip change the mass of magnesium oxide?
The mass of the magnesium will be lower than the mass of the magnesium oxide1 mole of Mg = 24 grams1 mole of MgO = 24 + 16 = 40 grams
Why is there a dull white coating on magnesium?
being oxidized by O2
Why does copper sulfate solution turn clear and magnesium develop a copper coating?
Redox! The magnesium is reducing the copper while the copper is oxidizing the magnesium. In other words, magnesium is giving electrons to the copper to bring the copper back to its metallic form while the magnesium is leaving the metal to be part of the solution as magnesium sulfate, which is colorless.
Is magnesium conductors?
Magnesium has many states, for example Magnesium Choride, or Magnesium carbonate. Magnesium has been experimented with as a Non Heat Conductor successfully using Magnesium Carbonate, and is also potentially argued as a lightweight form of heat resistant coating. Magnesium itself however, as Magnesium ribbon demonstrates, is highly flammable under direct flame, and reacts by giving off extremely bright light and heat, when in flame.
What is the correct interpretation of the formula MgF2?
The two elements that make up this compound are magnesium and fluorine. Flourine is a halogen and magnesium is an alkaline earth metal. This makes it an ionic compound, so the name would be magnesium fluoride.
Which material is the best atreflecting light?
Magnesium fluoride (MgF2) is a common antireflexive coating.
Can you use black coated knife with magnesium sticks to make a fire?
If you use a knife as your striker for a magnesium block or rod, you need to use the back of the blade, and it has to be made of carbon steel. Any type of coating on the blade that prevents contact of carbon steel with the magnesium block's flint rod prevents it from making sparks.
Why would you use zinc instead of magnesium to protect iron from rusting?
In this application the coating metal sacrifices itself to protect the underlying metal. The coating metal needs to have only a slightly higher reactivity than the metal it is protecting. Otherwise it will be used up prematurely. The "half-reaction potential" for metallic zinc is about -0.76 volts, that for magnesium about -2.37. Current prices for zinc are around US$1800 per metric tonne and for magnesium around US3300. A higher price would only exacerbate the effect of faster loss.
What happens when magnesium ribbon is burnt in air?
Magnesium is an extremely reactive metal. When stored, it reacts with oxygen to form a layer of magnesium oxide on its surface. This layer of magnesium oxide is quite stable and prevents further reaction of magnesium with oxygen. The magnesium ribbon is cleaned by sand paper for removing this layer so that the underlying metal can be exposed to air.
Why is Zn used to coat steel roofs and not magnesium?
Zinc is suitable for coating steel roofs because zinc does not react with water. It thus prevents the steel roof from rusting since steel is basically iron plus carbon and it will rust in the presence of oxygen and water. Furthermore, zinc is more reactive than iron, and can thus act as a sacrificial metal and corrode in place of iron, in the event that the zinc coating is damaged and the iron is exposed. On the other hand, magnesium is an alkaline earth metal and is too reactive. It will react with water to form magnesium hydroxide. (However, this reaction takes place for only a short while because the magnesium hydroxide produced is insoluble and will coat the metal, preventing further reaction between magnesium and water.) Mg + 2H2O → Mg(OH)2 + H2
