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Is evolution of gas upon boiling water with magnesium strips a chemical change?
Wiki User
∙ 14y ago
A chemical change is a change in which molecular composition of taken reactants changes.
If water decomposes to hydrogen and oxygen then it is a chemical change while freezing or boiling of water is a physical change as it's composition remains same.
Now if we take the case of boiling water with magnesium strips a colorless and odorless gas is evolved which can be collected using suitable arrangements. The colorless gas can be only water vapor or hydrogen( from decomposition of water ) or it can be a mixture of both of them. If we remove the water vapor using desiccating agent from the collected gas and them test the gas for combustion we will find that it is a supporter of combustion. This shows that gas is not water vapor but hydrogen. But hydrogen was not taken initially, hence we conclude that hydrogen was produced due to decomposition of water. Since the composition has changed so it is concluded that a chemical change has occurred.
Here is the chemical equation :
Mg + 2H2O --> Mg(OH)2 + H2
Wiki User
∙ 14y ago
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Is boiling does that changes as a physical or chemical?
Boiling is a physical change.
Is adding magnesium and heat chemical or physical change?
Heating magnesium is a physical process.But the reaction of magnesium with oxygen at high temperature is a chemical process.
Is magnesium physical change or chemical change?
Magnesium is not a change of any sort. It is a metallic element that can undergo both physical an chemical changes.
Is a boiling egg a physical change?
No, hard-boiling an egg is a chemical change. By cooking the egg you change its chemical composition.
When boiling take place is the phase change a chemical or physical change?
Boiling is a physical change.
Why burning of magnesium in air is chemical change?
magnesium burns in oxygen to form magnesium oxide. and hence this is a chemical change
When magnesium burns in air is it chemical or physical change?
Burning magnesium (or burning anything) can be described as a chemical reaction, or as a chemical change. It is not a property. However, the capacity of being able to burn, also known as flammability, is a chemical property.
Mixing magnesium and the product of burning magnesium with hydrochloric acid is it a physical or chemical change?
Is it a chemical change.
When magnesium is burnt in the air is it a chemical change?
Yes. Magnesium burns in air brightly giving Magnesium oxide, witch is a chemical change.
Is mixing magnesium and hydrochloric acid a chemical change?
Because you change the composition of the original matter. It is no longer in its original state. Chemical Change- Change in composition; burning, crushing, etc. physical change- changing state, but substance's composition stays same; freezing, boiling, etc
Is boiling does that changes as a physical or chemical?
Boiling is a physical change.
Is adding magnesium and heat chemical or physical change?
Heating magnesium is a physical process.But the reaction of magnesium with oxygen at high temperature is a chemical process.
Boiling egg physical or chemical change?
Chemical change.
Is magnesium physical change or chemical change?
Magnesium is not a change of any sort. It is a metallic element that can undergo both physical an chemical changes.
Is a magnesium ribbon fizzing in acid a physical change or chemical?
Magnesium fizzing in acid is definitely undergoing a chemical change.
What chemical change is it when Magnesium burns in air?
when magnesium burns in air a white powder called magnesium oxide is formed which is a new substance this is the chemical change
If you melt magnesium metal is it a chemical change?
Yes, the combustion of magnesium, or anything else for that matter, represents a chemical change. For magnesium, the combustion reaction results in the loss of magnesium and the production of magnesium oxide. Clearly a chemical change.
