Question

1.
Differentiate between reactants and products
What is variable valency? Give two examples of elements that show variable
valencies.​

Answer 1

Answer:

Explanation:

A reactant is a substance that is present at the start of a chemical reaction. The substance(s) to the right of the arrow are called products . A product is a substance that is present at the end of a chemical reaction.

Explanation:

Sometimes, same element may exhibit one valency in one compound and another valency in other compound. This property is called as variable valency.

Example

Element

Symbol

Valencies exhibited (variable valencies)

Copper

Cu

1, 2

Cu+1, Cu+2

Silver

Ag

1, 2

Ag+1, Ag+2

Gold

Au

1, 3

Au+1, Au+3

Iron

Fe

2, 3

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BY Tolety Roshan

Answer 2

Answer:

Reactant:- 1. The substance which takes part in a chemical reaction are called reactants.

2.Reactants are transformed into products.

Products:- 1. The new substance produced as a result of chemical reaction are called products.

2. The product thus formed have properties which are entirely different from those of the reactants.

Magnesium+Oxygen----> Magnesium oxide

_______________ _____________

| |

Reactant. Products

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