Mixtures, Elements, and Compounds in Grade 7
Explore the concept of mixtures in Grade 7 science, including types of mixtures, the role of solvents and solutes, methods for separating mixtures, and examples of homogenous and heterogeneous mixtures. Learn about air as a homogenous mixture of gases and smoke as a heterogeneous mixture of air and solid particles.
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MIXTURES, ELEMENTS AND COMPOUNDS. Grade 7
MIXTURES, ELEMENTS AND COMPOUNDS. In this sub-strand you are expected to: Define a Mixture Classify different Types of Mixtures. Meaning of the terms : solvent, solute and solution. Separate mixtures using different methods.
MIXTURES A mixture is a substance that is made up of two or more substances that are physically combined. A mixture can be in the form of solid, liquid, gas or a combination of two states of matter. Some substances mix and form a uniform mixture. These mixtures are known as Homogenous mixtures.
Examples of homogenous mixtures. i. Water + Milk ii. Salt + Water iii. Sugar + Milk iv. Kerosene + Turpentine v. Methylated spirit + Water vi. Petrol + Diesel vii. Cooking oil + Kerosene
Some substances when mixed form a non uniform mixture. These mixtures are known as Heterogeneous mixtures. Examples of Heterogenous mixtures i. Water + Sand ii. Maize + Beans iii. Iron fillings + Sulphur powder iv. Methylated spirit + Kerosene v. Flour + Water
Air is a homogenous mixture of gases. Smoke is a heterogenous mixture of air and solid smoke particles.
