Saved Bookmarks
| 1. |
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. |
|
Answer» Answer: 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. |
|