give one reason each of the following
1. gold and platinum are expensive
2. graphite is used to make electrodes
3. copper loses its shine when exposed to moist air
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Seasonal industries are those which employ people for only few months in a year. To save farmers and workers from ...
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1. The mines of Platinum are rare in comparison to gold. Nearly 1,782 tons of gold mined, only about 133 tons of platinum are mined annually. ... As it's most expensive, the production costs for an ounce of gold is about $957 – nearly half of what platinum costs
2. Graphite is used in making electrodes because it is a good conductor of electricity due to the presence of free electrons. One valence electron of each carbon atom remains free and thus it is a good conductor of electricity.
3. A copper vessel reacts with oxygen present in air when exposed to it , they forms copper oxide which , in turn , is a black coating over the vessel and makes the vessel to lose its shine .
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2. Graphite is used in making electrodes because it is a good conductor of electricity due to the presence of free electrons. One valence electron of each carbon atom remains free and thus it is a good conductor of electricity.
3. A copper vessel reacts with oxygen present in air when exposed to it , they forms copper oxide which , in turn , is a black coating over the vessel and makes the vessel to lose its shine .
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