Write the balanced equation for the following chemical reactions

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Write the balanced equation for the following chemical reactions.

(a) Hydrogen + Chlorine → Hydrogen chloride

(b) Barium chloride + Aluminium sulphate → Barium sulphate + Aluminium chloride

(c) Sodium + Water → Sodium hydroxide + Hydrogen

Note: A balanced chemical equation is a chemical equation that has been balanced, meaning that the numbers of moles on each side of the equation equal to each other.

Law of Conservation of Matter

The Law of Conservation of Matter says that matter cannot be created or destroyed. This means that in any chemical reaction, any atoms that are present in the reactants should also be present in the products.

To balance a chemical equation means to make the number of atoms on both the reactants and products side equal. To do so, coefficients need to be added to the equation. Coefficients are whole numbers that are placed in front of the element or compound in the equation to indicate how many units each substance does participate in a chemical reaction.

(a) Hydrogen + Chlorine → Hydrogen chloride

  • Symbol of hydrogen molecule: H2
  • Symbol of chlorine molecule: Cl2
  • Symbol of hydrogen chloride: HCl

H2 (g) + Cl2 (g) → 2HCl (g)

Hydrogen gas combines with chlorine gas to form hydrogen chloride gas.

(b) Barium chloride + Aluminium sulphate → Barium sulphate + Aluminium chloride

Symbol of barium chloride: BaCl2BaCl2
Symbol of aluminium sulphate: Al2(SO4)3Al2(SO4)3
Symbol of barium sulphate: BaSO4BaSO4
Symbol of aluminium chloride: AlCl3

3BaCl2 (s) + Al2(SO4)3 (s) → 3BaSO4(s) + 2AlCl3 (s)

When barium chloride reacts with aluminium sulphate to give barium sulphate and aluminium chloride.

(c) Sodium + Water → Sodium hydroxide + Hydrogen

  • Symbol of sodium: Na
  • Symbol of water : H2OH2O
  • Symbol of sodium hydroxide : NaOH
  • Symbol of hydrogen molecule: H2

2Na(s) + 2H2O (l) → 2NaOH (aq) + H2 (g)

Sodium reacts with water to give sodium hydroxide and hydrogen gas. The reaction is an example of redox reaction.

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