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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
What else can I help you with?
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 burning a magnesium ribbon a physical change?
Burning a magnesium ribbon is a chemical change because the magnesium reacts with oxygen in the air to form magnesium oxide. This results in a new substance being formed with different chemical properties than the original magnesium ribbon.
Is boiling does that changes as a physical or chemical?
Boiling is a physical change because the substance is changing from a liquid to a gas without changing its chemical composition.
Is magnesium burning in the air a chemical change?
Yes, magnesium burning in the air is a chemical change because it undergoes a chemical reaction with oxygen to form magnesium oxide. This reaction involves the rearrangement of atoms and the formation of new chemical bonds.
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.
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
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 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.
What type of change is boiling chemical change or chemical property?
Boiling is a physical change, not a chemical change. It does not alter the chemical composition of the substance. It is simply a phase change from liquid to gas.
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.
Boiling egg physical or chemical change?
Chemical change.
Is burning magnesium oxide a chemical change or physical?
Burning magnesium oxide is a chemical change because it involves a chemical reaction where the magnesium oxide is converted to a new substance (magnesium oxide reacts with oxygen to form magnesium oxide). This process involves the breaking and forming of chemical bonds.
Is burn magnesium a chemical change?
Yes, burning magnesium is a chemical change because it involves a chemical reaction where the magnesium combines with oxygen in the air to form magnesium oxide. This results in the formation of new substances with different chemical properties.
Is burning a magnesium ribbon a physical change?
Burning a magnesium ribbon is a chemical change because the magnesium reacts with oxygen in the air to form magnesium oxide. This results in a new substance being formed with different chemical properties than the original magnesium ribbon.
Is boiling does that changes as a physical or chemical?
Boiling is a physical change because the substance is changing from a liquid to a gas without changing its chemical composition.
Is magnesium burning a physical change?
No, magnesium burning is a chemical change because the magnesium undergoes a chemical reaction with oxygen to form magnesium oxide. Physical changes do not alter the chemical composition of a substance, whereas chemical changes do.
