Q4) Complete the equations
a) Carbon dioxide + Water ---------à
b) Hydrochloric acid + Sodium hydroxide ------------à
c) Sodium bicarbonate ----------------------à
d) Calcium hydroxide + Carbon dioxide -------------à
e) Copper sulphate + Iron -------------à
f) Sodium chloride + Silver nitrate ---------------à
Answers
Explanation:
(a) When carbon dioxide reacts with water, carbonic acid is formed, from which hydrogen ions dissociate, increasing the acidity of the system. ... Carbon dioxide emissions to the atmosphere can therefore increase the acidity of land, sea and air.
(b) Hydrochloric acid reacts with sodium hydroxide to form sodium chloride (the salt) and water. Sodium chloride is made up of Na+ cations from the base (NaOH) and Cl- anions from the acid (HCl). HCl+NaOH→H2O+NaCl.
(c) Sodium bicarbonate, commonly known as baking soda or bicarbonate of soda, is a chemical compound with the formula NaHCO₃. It is a salt composed of a sodium cation and a bicarbonate anion. Sodium bicarbonate is a white solid that is crystalline, but often appears as a fine powder.
(d) Carbon dioxide reacts with limewater (a solution of calcium hydroxide, Ca(OH) 2), to form a white precipitate (appears milky) of calcium carbonate, CaCO 3. Adding more carbon dioxide results in the precipitate dissolving to form a colourless solution of calcium hydrogencarbonate.
(e) Chemical reaction of iron nail with copper sulphate solution in water. Iron displaces copper ions from an aqueous solution of copper sulphate. It is a single displacement reaction of one metal by another metal.
(f) Silver Nitrate and Sodium Chloride is an example of a chemical reaction that creates a solid. The Chemical Formula is Agcl + NaNO3. When these two chemicals are combined, a white precipitate of silver chloride is formed. In this chemical reaction, a whole new substance is formed.
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