Write the chemical formula for each substance mentioned in the following word de
ID: 883557 • Letter: W
Question
Write the chemical formula for each substance mentioned in the following word descriptions (use the front inside cover to find the symbols for the elements you do not know). (a) Zinc carbonate can be heated to form zinc oxide and carbon diox- ide. (b) On treatment with hydrofluoric acid, silicon dioxide forms silicon tetrafluoride and water. (c) Sulfur dioxide reacts with water to form sulfurous acid. (d) The substance phos- phorus trihydride, commonly called phosphine, is a toxic gas. (e) Perchloric acid reacts with cadmium to form cadmium(II) perchlorate. (f) Vanadium(III) bromide is a colored solid.Explanation / Answer
(a) Zinc carbonate can be heated to form zinc oxide and carbon diox- ide
ZnCO3 ------------------------> ZnO + CO2
(b) On treatment with hydrofluoric acid, silicon dioxide forms silicon tetrafluoride and water.
6HF + SiO2 ------------------------> H2SIF6 + 2 H2O
(c) Sulfur dioxide reacts with water to form sulfurous acid
SO2 + H2O ----------------------> H2SO3
(d) The substance phos- phorus trihydride, commonly called phosphine, is a toxic gas.
PH3 is called phosphine
(e) Perchloric acid reacts with cadmium to form cadmium(II) perchlorate.
2 HClO4 + Cd ---------------------> Cd(ClO4)2 + H2
(f) Vanadium(III) bromide is a colored solid.
VBr3 is called Vanadium(III) bromide
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