Very Short Question and Answers - Writing Equations

A chemical equation represents a chemical reaction using chemical formulae and symbols to show the reactants and products.

Magnesium + Oxygen → Magnesium oxide.

Reactants are placed on the left-hand side (LHS) and products on the right-hand side (RHS) of the arrow.

The plus signs (+) indicate that multiple reactants or products are involved in the reaction.

Mg + O₂ → MgO.

A chemical equation can be balanced by adjusting the coefficients before the compounds to ensure the same number of atoms of each element on both sides.

A balanced chemical equation has the same number of atoms of each element on both sides of the equation.

The total mass of the reactants should be equal to the total mass of the products.

Zinc sulfate (ZnSO₄) and Hydrogen (H₂) are the products.

There are 2 hydrogen atoms in the reactants.

Coefficients indicate the number of molecules or moles of each substance involved in the reaction.

The hit-and-trial method is commonly used to balance chemical equations.

Water in steam form is represented as H₂O(g) in a chemical equation.

The symbol (aq) represents that the substance is in aqueous solution, or dissolved in water.

It provides more information about the reactants and products, which can affect the outcome of the reaction.

(s) represents solid, (l) represents liquid, and (g) represents gas.

The equation is balanced, showing equal numbers of each atom on both sides.

There are 3 iron atoms in the reactants.

Balancing a chemical equation ensures that the law of conservation of mass is upheld in the reaction.

3 Mg(s) + O₂(g) → 3 MgO(s).