Answer these questions of class 9
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Answer:
When iron filings and sulphur powder are mixed, both retain their properties. It means they have not undergone any chemical reaction. Therefore, mixing of iron and sulphur is a physical change. When iron filings and sulphur powder are mixed and heated they undergo a chemical reaction and form ferrous sulphide (FeS).A cotton shirt, before it reaches you, completes a long journey. Elaborate this journey starting from cotton
bollsA cotton shirt, before it reaches you, completes a long journey. Elaborate this journey starting from cotton bolls. In spinning processes, the fibres from a mass of cotton wool are drawn out and twisted. This brings the fibres together to form a long and twisted thread called 'yarn'.A cotton shirt, before it reaches you, completes a long journey. Elaborate this journey starting from cotton
bolls