Mention any two difference between physical and chemical changes. Give one example of each. List any two properties for each following cases of metals which makes them suitable to be used as: (i) utensils for cooking food (ii) wires for electrical connections.
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1. A physical change is reversible, a chemical change is not. For example, the freezing of water would be a physical change because it can be reversed, whereas the burning of wood is a chemical change - you can't 'unburn' it
2. A physical change is a change in which no new substance is formed; a chemical change results in the formation of one or more new substances. Again, consider the previous examples: Freezing water into ice just results in water molecules which are 'stuck' together - it's still H2O. Whereas burning wood results in ash, carbon dioxide, etc, all new substances which weren't there when you started.
2. A physical change is a change in which no new substance is formed; a chemical change results in the formation of one or more new substances. Again, consider the previous examples: Freezing water into ice just results in water molecules which are 'stuck' together - it's still H2O. Whereas burning wood results in ash, carbon dioxide, etc, all new substances which weren't there when you started.
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the use of metals to be suitable to used as utensils for cooking food is thermal conductivity and malleability ( ability to make metals to thin sheets). The use of metals for wires for electrical connections is electrical conductivity of metals and ductility (ability to make metals into thin wires)
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