Part 12 Pattern in the Chemical World

Question 1

Across a period, the elements demonstrate a gradual change in some of their physical properties. State one such property.

Answer 1

Atomic size // Electronegativity // Metallic character

Question 2

State the changes in bond type of the element across the period.

Answer 2

The nature of bonding changes from matallic bonding to covalent bonding.

Question 3

State the types of oxide of Na2O.

Answer 3

Basic oxides
( It reacts with water to form a base)

Question 4

State the types of oxides of MgO.

Answer 4

Basic oxides
( It reacts with water to form a base) / ( it reacts with acid)

Question 5

State the types of oxides of Al2O3.

Answer 5

Amphoteric oxides
( It reacts with both acid and alkali)

Question 6

State the types of oxides of SiO2.

Answer 6

Acidic oxides
( It reacts with water to form an acid ) / ( It reacts with base )

Question 7

State the types of oxides of P4O10.

Answer 7

Acidic oxides
( It reacts with water to form an acid ) / ( It reacts with base )

Question 8

State the types of oxides of SO2.

Answer 8

Acidic oxides
( It reacts with water to form an acid ) / ( It reacts with base )

Question 9

State the types of oxides of ClO2.

Answer 9

Acidic oxides
( It reacts with water to form an acid ) / ( It reacts with base )

Question 10

Write down the equation for the reaction between Na2O and HCl.

Answer 10

Na2O(s) + 2HCl(aq) –> 2NaCl(aq) + H2O(l)

Question 12

Write down the equation for the reaction between MgO and HCl

Answer 12

MgO(s) + 2HCl(aq) –> MgCl(aq) + H2O(l)

Question 13

Write down the equation for the reaction between Al2O3 and HCl

Answer 13

Al2O3(s) + 6HCl –> 2AlCl3(aq) + 3H2O