Question

F. Give reasons for the following.
1. A word equation is only qualitative.
2. Formation of rust is a chemical reaction.
3. Burning of magnesium ribbon in air is a combination reaction.
4. Splitting of sodium chloride is a decomposition reaction.​

Answer 1

Answer:

1.Word equation is only qualitative because it does not give any idea about number of atoms and molecules are reacting and foemed

3.Burning of magnesium ribbon in air is a combination reaction.

Answer 2

Answer:

1. Because it does not give any idea about number of atoms and molecules are reacting and foemed.

2. Rusting is an oxidation reaction. The iron reacts with water and oxygen to form hydrated iron(III) oxide, which we see as rust. Iron and steel rust when they come into contact with water and oxygen – both are needed for rusting to occur.

3. Burning magnesium ribbon in air to form magnesium oxide is an example of combination reaction. Because oxygen and magnesium combine in a chemical reaction to form this compound. After it burns, it forms a white powder of the magnesium oxide. Magnesium gives up two electrons to oxygen atoms to form this powdery product.

4. Electrolysis of water is the decomposition of water into hydrogen and oxygen due to the passage of electric current through it. Decomposition of sodium chloride:On passing electricity through molten sodium chloride, it decomposes into sodium and chlorine.