Chemistry
Complete the following statements.
(a) The chemical change involving iron and hydrochloric acid illustrates a …………… reaction.
(b) In the type of reaction called …………… two compounds exchange their positive and negative radicals.
(c) A catalyst either …………… or …………… the rate of a chemical change but itself remains …………… at the end of the reaction.
(d) On heating, hydrated copper sulphate changes its colour from …………… to ……………
Answer
(a) The chemical change involving iron and hydrochloric acid illustrates a displacement reaction.
(b) In the type of reaction called double displacement two compounds exchange their positive and negative radicals.
(c) A catalyst either accelerates or decelerates the rate of a chemical change but itself remains unaffected at the end of the reaction.
(d) On heating, hydrated copper sulphate changes its colour from blue to white.
Related Questions
Thermal decomposition of sodium carbonate will produce
(i) carbon dioxide
(ii) oxygen
(iii) sodium hydroxide
(iv) no other product
Match the following :
When hydrogen burns in oxygen, water is formed; when electricity is passed through water, hydrogen and oxygen are given out. Name the type of chemical changes involved in the two cases.
Explain the following chemical changes by giving one example of each:
(a) Double decomposition
(b) Thermal dissociation
(c) Reversible reaction
(d) Displacement