Test # 104

Some people who have been made redundant make no further effort to get employment in complete ________ to those who decide to retrain.

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  • Simple Science

    How Pure Metal is obtained from Ore

    Some Uses of Electricity:
    When ore is mined, it contains in addition to the desired metal many other substances. In order to separate out the desired metal, the ore is placed in some suitable acid bath, and is connected with the positive terminal of a battery, thus taking the place of the silver slab in the last Section. When current flows, any pure metal which is present is dissolved out of the ore and is deposited on a convenient negative electrode, while the impurities remain in the ore or drop as sediment to the bottom of the vessel. Metals separated from the ore by electricity are called electrolytic metals and are the purest obtainable.

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