CORROSION The following about corrosion –i) Silver articles become black after some time when exposed to air.This is because it reacts with sulphur in the air to form a coating of silver sulphide.ii) Copper reacts with moist carbon dioxide in the air and slowly loses its shiny brown surface and gains a green coat. This …
Refining of MetalsThe metals produced by various reduction processes described above are not very pure. They contain impurities, which must be removed to obtain pure metals.The most widely used method for refining impure metals is electrolytic refining.Electrolytic Refining: Many metals, such as copper, zinc, tin, nickel, silver, gold, etc., are refined electrolytically. In this process, …
Extracting Metals towards the Top of the Activity SeriesThe metals high up in the reactivity series are very reactive. They cannot be obtained from their compounds by heating with carbon. For example, carbon cannot reduce the oxides of sodium, magnesium, calcium, aluminium, etc., to the respective metals. This is because these metals have more affinity …
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Extracting Metals in the Middle of the Activity Series The metals in the middle of the activity series such as iron, zinc, lead, copper, are moderately reactive. These are usually present as sulphides or carbonates in nature. It is easier to obtain a metal from its oxide, as compared to its sulphides and carbonates. Therefore, …
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Extracting Metals Low in the Activity Series Metals low in the activity series are very unreactive. The oxides of these metals can be reduced to metals by heating alone. For example, cinnabar (HgS) is an ore of mercury. When it is heated in air, it is first converted into mercuric oxide (HgO). Mercuric oxide is …
Difference between Metals and Non – metals Physical properties Chemical properties
The reactivity series of metals. The metals at the bottom of the activity series are the least reactive. They are often found in a free state. For example, gold, silver, platinum and copper are found in the free state. Copper and silver are also found in the combined state as their sulphide or oxide ores. …
Properties of Ionic Compounds You may have observed the following general properties for ionic compounds— (i) Physical nature: Ionic compounds are solids and are somewhat hard because of the strong force of attraction between the positive and negative ions. These compounds are generally brittle and break into pieces when pressure is applied. (ii) Melting and …
HOW DO METALS AND NON-METALS REACT ? The reactions of metals with a number of reagents. The electronic configuration of elements the noble gases, which have a completely filled valence shell, show little chemical activity. We, therefore, explain the reactivity of elements as a tendency to attain a completely filled valence shell.The electronic configuration of …
The Reactivity Series The reactivity series is a list of metals arranged in the order of their decreasing activities. After performing displacement experiments, the following series, known as the reactivity or activity series has been developed. Important Details Given their ease of oxidation, the metals at the top of the reactivity series are effective reducing …
