P5.
36.
i) Define combination reaction. Give Example.
ii) List any two strong acids and strong bases.
iii) What is an amphoteric oxide?
iv) Define: Catenation
V) Suggest any two methods to prevent corrosion
Answers
Answer:
In combination reactions, two or more substances combine to form a new compound. ... The reactants in such reactions can be elements as well as compounds. For Example, Calcium oxide reacts with water to produce calcium hydroxide.
Strong Acids
Strong Acids Strong Bases
hydrochloric acid (HCl) sodium hydroxide (NaOH)
hydrobromic acid (HBr) potassium hydroxide (KOH)
hydroiodic acid (Hl) calcium hydroxide (Ca(OH)2)
nitric acid (HNO3) strontium hydroxide (Sr(OH)2)
Metal oxides which react with both acids as well as bases to produce salts and water are known as amphoteric oxides. Many metals (such as zinc, tin, lead, aluminium, and beryllium) form amphoteric oxides or hydroxides. Amphoterism depends on the oxidation states of the oxide.
In chemistry, catenation is the bonding of atoms of the same element into a series, called a chain. A chain or a ring shape may be open if its ends are not bonded to each other, or closed if they are bonded in a ring. The words to catenate and catenation reflect the Latin root catena, "chain".
Two ways of preventing corrosion are galvanisation and coatings. Galvanisation is coating of thin layer of zinc on the metal which is about to corrode as zinc being highly reactive does not react with air and moisture. Coating is the paint applied on the metal surface.
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Explanation:
1.Combination reaction: It is a reaction in which two reactants combine together to form a single product.
e.g. Cao + H2O ------ Ca(OH)2
2.Strong acid: Hydrochloric acid is used as bathroom cleaner and sulphuric acid is used as electrolyte in battery.
Strong base: Sodium hydroxide is used for making soap and potassium hydroxide is used as cleansing agent.
3.Metal oxides which react with both acids as well as bases to produce salts and water are known as amphoteric oxides.
4.Catenation can be defined as the self-linking of atoms of an element to form chains and rings.
5.Two ways of preventing corrosion are galvanisation and coatings.