Question

Write the balanced chemical equation for the following and identify the type of reaction in each case.
(a) Potassium bromide (aq) + Barium Iodide (aq) $\to $ Potassium iodide (aq) + Barium bromide (s)
(b) Zinc Carbonate (s) $\to $ Zinc oxide (s) + Carbon dioxide (g)
(c) Hydrogen (g) + Chlorine (g) $\to $ Hydrogen chloride (g)
(d) Magnesium (s) + Hydrochloric acid (aq) $\to $ Magnesium Chloride (aq) + Hydrogen (g)

Answer 1

Hint Chemical reactions are of different types. For example double displacement reaction, decomposition reaction, combination reactions are few types of chemical reaction generally we see in chemistry.

Complete step by step answer:
- In the given question it is asked to write the chemical equation for the given options and asked to identify the types of chemical reaction in each case.
(a) Potassium bromide (aq) + Barium Iodide (aq) $\to $ Potassium iodide (aq) + Barium bromide (s)
- The molecular formula of potassium bromide is – KBr
- The molecular formula of Barium iodide is - $Ba{{I}_{2}}$ .
- The molecular formula of Potassium iodide is – KI
- The molecular formula of Barium bromide is - $BaB{{r}_{2}}$
- The chemical equation is as follows.
\[2KB{{r}_{(aq)}}+Ba{{I}_{2}}_{(aq)}\to 2K{{I}_{(aq)}}+BaB{{r}_{2}}_{(s)}\]
- In the above chemical reaction 2 moles of potassium bromide reacts with one mole of barium iodide and forms 2 moles of potassium iodide and one mole of barium bromide as the products.
- In the given chemical reaction, both the reactants exchange ions and form two new products. So, it is an example for double displacement reaction.
(b) Zinc carbonate (s) $\to $ Zinc oxide (s) + Carbon dioxide (g)
- The molecular formula of zinc carbonate is - $ZnC{{O}_{3}}$ .
- The molecular formula of zinc oxide is – ZnO.
- The molecular formula of carbon dioxide is - $C{{O}_{2}}$ .
- The chemical equation is as follows.
\[ZnC{{O}_{3}}_{(s)}\to Zn{{O}_{(s)}}+C{{O}_{2}}_{(g)}\]
- In the above chemical reaction one mole of zinc carbonate converts to one moles of zinc oxide and one mole of carbon dioxide.
- In the above reaction a single chemical is going to convert into two different products then it is an example for decomposition reaction.
(c) Hydrogen (g) + Chlorine (g) $\to $ Hydrogen chloride (g)
- The molecular formula of hydrogen is - ${{H}_{2}}$ .
- The molecular formula of chlorine is - $C{{l}_{2}}$ .
- The molecular formula of hydrogen chloride is – HCl.
- The chemical equation is as follows.
\[{{H}_{2}}_{(g)}+C{{l}_{2}}_{(g)}\to 2HC{{l}_{(g)}}\]
- In the above chemical reaction one mole of hydrogen reacts with one mole of chlorine and forms 2 moles of HCl as the product.
- In this reaction two different chemicals are going to combine and form a single chemical then it is called a combination reaction.
(d) Magnesium (s) + Hydrochloric acid (aq) $\to $ Magnesium Chloride (aq) + Hydrogen (g)
- The molecular formula of Magnesium is – Mg.
- The molecular formula of Hydrochloric acid is – HCl.
- The molecular formula of Magnesium Chloride - $MgC{{l}_{2}}$ .
- The molecular formula of Hydrogen is - ${{H}_{2}}$ .
\[M{{g}_{(s)}}+2HC{{l}_{(aq)}}\to MgC{{l}_{2}}_{(aq)}+{{H}_{2}}_{(g)}\]
- In the above reaction one mole of magnesium reacts with 2 moles of hydrochloric acid and forms one mole of magnesium chloride and one mole of hydrogen as the products.
- The above chemical reaction is an example of displacement reaction.

Note: We should remember that we have to balance the chemical reaction on the both sides of the chemical reaction. Then the reaction is called a balanced chemical reaction. The phases of the reactants and products should not be the same.