Name an alloy of (f) aluminium used in the construction of aircraft. (fi) lead used in joining metals for electrical work

(a) Ammonia gas is formed  (b) Methane is formed

(c) either metals or non-metals 

(a) The mass of 1 mole of nitrogen atoms is 14g.  (b) The mass of 4 moles of aluminium atoms is (4 × 27)g = 108g  (c) The mass of 10 moles...

1 mole of aluminium oxide (Al2O3) = 2 × 27 + 3 × 16 = 102g  i.e., 102g of Al2O3 = 6.022 × 1023 molecules of Al2O3  Then, 0.051 g of Al2O3...

(c) Generally, metals are ductile. However, mercury metal - a liquid at room temperature - cannot be drawn into wires and is not ductile.

Tungsten is used for making the filament of bulbs.​

The allow 'Alnico' is used for making permanent magnets. It is an alloy of aluminium, nickel, cobalt and iron.

B alone finish work in x days A alone work in x - 5 A one day works= 1/(x-5) and B one day works = 1/x A+B one day work = 1/6 so, 1/(x-5)...

Metal Chief ore Method of concentration Copper Copper pyrite (CuFeS2) Froth floatation Aluminium Bauxite [AlOx (OH)3–2x] where 0 < x < 1 Leaching

(i) Infrared rays (ii) Microwaves.