Question

When an element ‘X’ with atomic number 11 is made to react with an element ‘Y’ which is a greenish yellow gas, a
compound ‘Z’ is obtained.
a. Identify X ,Y & Z.
b. Specify is this a physical or chemical change with reason.
c. Write the word equation and chemical equation for the above reaction.

Answer 1

Answer:

a. X is sodium, Y is chlorine and Z is sodium chloride i. e. salt

b. it is a chemical change because it results in the formation of a new compound from two

reactants

c. sodium + chlorine gas react to produce sodium chloride or salt

2Na(s) + Cl2(g) = 2NaCl(s)

Answer 2

2 Na (s) + C12 (g) - 2 Na C1 (s)