Question

State whether the statements given below are true or false. Rewrite the false statements correctly.
(a) All metals are solids at room temperature.
(b) Non-metals are good conductors of heat but poor conductors of electricity.
(c) A molecule of sodium is made of sodium atoms only, so it is an element.
(d) Compounds are made up of only one type of element.
(e) The symbol and formula of copper are the same.
(f) An atom consists of electrons, protons and neutrons.
(g) Some atoms can stand on their own.
(h) Water is called combination because it is formed by the combination of two or more substances.
(i) If two atom join together a compound is formed.
(j) The electron is a particle which is smaller than an atom.
(k) Zinc, copper, nitrogen and silver are all metals.
(l) An atom of iron can stand on its own.
(m) The molecule of a compound contains the same kind of atoms joined together.
(n) Oxygen, nitrogen and hydrogen are gases.
(o) The valency of hydrogen is one.

Answer 1

(a) False. All metals except mercury are solids at room temperature.

(b) False. Non-metals are poor conductors of heat as well as electricity.

(c) True.

(d) False. Compounds may be made up of two or more types of elements.

(e) True.

(f) True.

(g) True.

(h) False. Water is called a compound formed from the combination of two atoms of hydrogen and one atom of oxygen.

(i) False. When two different atoms join together, a compound is formed.

(j) True.

(k) False. Zinc, copper and silver are metals while nitrogen is a non-metal.

(l) True.

(m) False. The molecule of a compound contains different kind of bonded atoms.

(n) True.

(o) True.