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1.Malleable and ductile properties of ametal make it suitable for making jewellery. Moreover, rusting and tarnishing is undesirable. If take it into account these properites, Gold and Platinum rank on top of metals list. Hence jewelleries made from gold and platinum are sold.
2.Because it's cheaper and lighter than copper wire of the same resistance per length;about six times cheaper and twice as light as copper.
3.Fe (s) + CuSO4 (aq) -> FeSO4 (aq) + Cu (s)
In this case, iron, being more reactive than copper, will displace it from the solution. That is, ferrous ions or Fe(II) will go into the solution, while curic or Cu(II) will be deposited onto the nail. This cause the solution color to change from blue to green. The copper coating on the nail will give it a refdish-brown color. And we end up with solid copper and a solution of ferrous sulfate.
5.Metals, in general, are substances which have high electrical conductivity, high thermal conductivity, and high density. Typically they are malleable and ductile, deforming under stress without cleaving. In terms of optical properties, metals are shiny and lustrous. This article is on reactivity series of metals.
4.When a metal reacts with dilute acid, salts are formed. During this reaction hydrogen gas is evolved. In other words, when a metal is added to dilute acids, salt and hydrogen gas are formed.
Sulfate salts and chloride salts are formed when metals react with dilute sulfuric acid and hydrochloric acid. Some metals reacts vigorously with dilute sulfuric acid or hydrochloric acid for example, potassium, sodium, lithium and calcium
6.Galvanization or galvanizing (also spelled galvanisation or galvanising) is the process of applying a protective zinc coating to steel or iron, to prevent rusting. The most common method is hot-dip galvanizing, in which the parts are submerged in a bath of molten zinc.
7.(a). A reactivity series (or activity series) is an empirical, calculated, and structurally analytical progression of a series of metals, arranged by their "reactivity" from highest to lowest.It is used to summarize information about the reactions of metals with acids and water, double displacement reactions and the extraction of metals from their ores.
(b). A single-displacement reaction, is a chemical reaction in which one (or more) element(s) replaces an/other element(s) in a compound. It can be represented generically as:
A + B-C → A-C + B