Mixing materials - Dissolving

Grade 3Cambridge (IGCSE)

Review the key concepts, formulae, and examples before starting your quiz.

🔑Concepts

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Dissolving is a process where a solid (called the solute) mixes with a liquid (called the solvent) to form a clear mixture called a solution .

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A substance that can dissolve in a liquid is said to be soluble (e.g., sugar in water).

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A substance that cannot dissolve in a liquid is said to be insoluble (e.g., sand in water).

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When a solid dissolves, it does not disappear; it breaks down into pieces so tiny that they are invisible to the naked eye. The mass of the solid is still present in the liquid.

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Conservation of mass: The mass of the solution is equal to the mass of the solvent plus the mass of the solute.

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📐Formulae

\text{Solute} + \text{Solvent} = \text{Solution}

\text{Mass of Solution} = \text{Mass of Solute} + \text{Mass of Solvent}

💡Examples

Problem 1:

5\text{ g}

Solution:

\begin{array}{r} 50 \\ + 5 \\ \hline 55 \end{array} \text{ g}

Explanation:

55\text{ g}

Problem 2:

1

Solution:

1

Explanation:

Smaller pieces of a solute have more surface area touching the solvent, which allows them to dissolve much faster than a large, solid cube.

Problem 3:

20^{\circ}\text{C}

Solution:

70^{\circ}\text{C}

Explanation:

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