Chemistry
Give a balanced equation for a direct combination reaction involving :
(a) Two elements — one of which is a neutral gas and the other a yellow non-metal
(b) Two elements – one of which is a neutral gas and the other a monovalent metal
(c) Two compounds – resulting in formation of a weak acid
Answer
(a) Direct Combination of two elements one of which is a neutral gas and the other a yellow non-metal:
S + O2 [g] ⟶ SO2
(b) Direct Combination of two elements one of which is a neutral gas and the other a monovalent metal
4Na + O2 [g] ⟶ 2Na2O
(c) Formation of a weak acid:
CO2 [g] + H2O ⟶ H2CO3
Related Questions
Chemical reactions may proceed with evolution or absorption of heat. Give an example of each.
Define the following types of chemical changes or reactions with a suitable example of each.
(a) Direct combination reaction or synthesis
(b) Decomposition reaction
(c) Displacement reaction or substitution reaction
(d) Double decomposition reaction
Give balanced equations for the following reactions of synthesis involving formation of :
(a) An acid – from sulphur dioxide gas
(b) An alkali – from a basic oxide – sodium oxide
(c) A salt – from a trivalent metal and a coloured gas.
Convert — (a) nitrogen to ammonia (b) hydrogen to hydrogen chloride – by a direct combination reaction.