Fill in the following blanks with suitable words:
(a) Metals are……………. conductors of heat and……………...
(b) Most non-metals are……………. conductors of heat and electricity.
(c) Phosphorous is a very……………. Non-metal.
(d) Metals react with acids to produce………... gas.
(e) Iron is more…………. than copper.
(f) Metals form……...oxides whereas non-metals form………oxide.
(g) Sulphur forms………oxide whereas magnesium forms…………...oxide.
(h) A non-metal is used to make an antiseptic solution called tincture…………...
(a) good; electricity
Metals are used to make wires because they are good conductors of electricity. Due to good conductors of heat, metals are used to make utensils.
(b) poor
Non- metals do not have free electrons; hence, they are non-conductors of heat and electricity.
(c) reactive
Phosphorus cannot be kept open in the air because it combines with oxygen so easily that it catches fire automatically. For safety, phosphorus is stored under water in chemical laboratories.
(d) hydrogen.
Metals react with dilute acids to form metallic salts and hydrogen gas. For example, zinc reacts with dilute hydrochloric acid to form zinc chloride and hydrogen gas.
(e) reactive
Iron is more reactive than copper. For example, if we put Iron nail into copper sulphate solution. Iron nail will displace copper from copper sulphate solution.
(f) basic; acidic
Metallic oxides are basic because they react with water to form bases. Nonmetals react with oxygen to form nonmetallic oxides which are acidic in nature because they react with water to form acids.
(g) acidic; basic
Metallic oxides are basic because they react with water to form bases. Nonmetals react with oxygen to form nonmetallic oxides which are acidic in nature because they react with water to form acids.
(h) iodine
Iodine is used to make purple coloured solution which is applied on cuts and wounds as an antiseptic. It is used in the treatment and prevention of wound infection.