1.3

Question 0

Periodicity

Answer 0

Periodicity is a regular periodic variation of properties of elements with atomic number and position in the periodic table.

Question 1

Period

Answer 1

A period is a horizontal row of elements in the periodic table.
Elements show trends in properties across a period.

Question 2

Thermal decomposition

Answer 2

The breaking up of a chemical substance with heat into at least two chemical substances.

Question 3

A displacement reaction

Answer 3

A reaction in which a more-reactive element displaces a less-reactive element from an aqueous solution of latter’s ions.

Question 4

Disproportionation

Answer 4

Disproportionation is the oxidation sand reduction of the same element in a redox reaction

Question 5

A precipitation reaction

Answer 5

The formation of a solid from a solution during a chemical reaction. Precipitates are often formed when two aqueous solutions are mixed.