When Iron powder and Sulphur powder were mixed together and heated strongly, a substance A was formed. When dil. Hydrochloric acid was added to substance A, the gas B was evolved. a) What is A and what type of substance is it? b) Name the gas B. State one characteristic property of gas B. c) Is the reaction of Iron and Sulphur powder a chemical change or a physical change? Give reasons to support your answer.
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a) Iron/ferrous sulphide
b) Hydrogen gas, at standard temperature and pressure, hydrogen is a nontoxic, nonmetallic, odorless, tasteless, colorless, and highly combustible diatomic gas with the molecular formula H2.
c) It is a chemical change, because when iron and sulphur powder mixed it forms a totally different substance which is iron sulphate, which has different chemical property from that of iron and sulphur powder.
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