Write the chemical formula for each substance mentionedin the following word descriptions (use the front insidecover to find the symbols for the elements you do not know).(a) Zinc carbonate can be heated to form zinc oxide and carbondioxide. (b) On treatment with hydrofluoric acid, silicondioxide forms silicon tetrafluoride and water. (c) Sulfurdioxide reacts with water to form sulfurous acid. (d) The substancephosphorus trihydride, commonly called phosphine,is a toxic gas. (e) Perchloric acid reacts with cadmium to formcadmium(II) perchlorate. (f) Vanadium(III) bromide is a coloredsolid.
States of Matter
The substance that constitutes everything in the universe is known as matter. Matter comprises atoms which in turn are composed of electrons, protons, and neutrons. Different atoms combine together to give rise to molecules that act as a foundation for all kinds of substances. There are five states of matter based on their energies of attraction, namely solid, liquid, gases, plasma, and BEC (Bose-Einstein condensates).
Chemical Reactions and Equations
When a chemical species is transformed into another chemical species it is said to have undergone a chemical reaction. It consists of breaking existing bonds and forming new bonds by changing the position of electrons. These reactions are best explained using a chemical equation.
Write the chemical formula for each substance mentioned
in the following word descriptions (use the front inside
cover to find the
(a) Zinc carbonate can be heated to form zinc oxide and carbon
dioxide. (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
phosphorus 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.
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