Lesson Notes By Weeks and Term v5 - Grade 5

Lesson Video

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Performance objectives

• Define a mixture and a solution with everyday examples.
• Identify mixtures as heterogeneous or homogeneous.
• Describe the components (parts) of a mixture.
• Give examples of mixtures and solutions from your home.
• Explain the difference between a mixture and a pure substance.

Lesson summary

This week, we're starting our exciting journey into the world of matter and materials! We’re going to investigate what happens when we mix different things together. Imagine making cool drink, like Mazoe Orange. The syrup mixes with water to create a delicious drink. Or think about cooking pap - maize meal mixes with water and heat to create a staple food. These are examples of mixtures! Understanding mixtures and how they work helps us in everyday life, from cooking to cleaning to understanding the world around us. In South Africa, we use mixtures constantly, and knowing how they behave is important for many reasons, including making sure our food and water are safe.

Lesson notes

What is Matter? Everything around us is made of matter. Matter is anything that has weight (mass) and takes up space (volume). Your desk, your book, the air you breathe, and even you, are made of matter. Pure Substances A pure substance is made up of only one kind of material.

Examples of pure substances include: Water (H₂O): When it’s pure, water is only made of water molecules.

Salt (NaCl): Table salt is only made of sodium chloride. Sugar (C₁₂H₂₂O₁₁): The sugar you put in your tea or coffee is a pure substance. Mixtures A mixture is a combination of two or more different substances that are physically combined but not chemically changed. This means each substance keeps its own properties. In a mixture, you can often see (or sometimes easily separate) the different parts.

Examples of Mixtures: Sand and stones: You can easily see the separate grains of sand and pieces of stone.

Salad: A salad is a mixture of different vegetables like lettuce, tomatoes, cucumbers, and onions.

Soil: Soil is a mixture of sand, clay, and decaying plant matter (humus).

Air: While it seems like one thing, air is a mixture of different gases like nitrogen, oxygen, and carbon dioxide.

Types of Mixtures: There are two main types of mixtures: Heterogeneous Mixtures: In a heterogeneous mixture, you can easily see the different components. The substances are not evenly distributed. Think of a mixed vegetable soup where you can see the carrots, potatoes, and peas separately. Another example is biltong. While the spices are distributed, you can still identify the meat fibres.

Homogeneous Mixtures: In a homogeneous mixture, the different components are mixed so well that you cannot easily see them separately. The substances are evenly distributed throughout the mixture. Another name for a homogeneous mixture is a solution.

Solutions: A solution is a special type of homogeneous mixture where one substance (the solute) dissolves completely into another substance (the solvent).

Solute: The substance that is being dissolved.

Solvent: The substance that does the dissolving.

Examples of Solutions: Sugar water: Sugar (solute) dissolves in water (solvent) to create sugar water (solution).

Saltwater: Salt (solute) dissolves in water (solvent) to create saltwater (solution). Cool Drink (e.g., Mazoe Orange): The syrup (solute) dissolves in water (solvent) to create the cool drink (solution). Even though it looks like just one liquid, it's a mixture!

Vinegar: This is a solution of acetic acid (the solute) in water (the solvent).

Air: Although we said air is a mixture, it is also a homogeneous mixture of gases, so it can be considered a solution too!

Worked example

Example 1: Sand and Water

Is sand and water a mixture? Yes.

Is it homogeneous or heterogeneous? Heterogeneous. You can see the sand particles separate from the water.

Components: Sand and Water.

Example 2: Sugar and Tea

Is sugar and tea a mixture? Yes.

Is it homogeneous or heterogeneous? Once the sugar is fully dissolved, it is homogeneous (a solution). Before dissolving, it is heterogeneous.

Components: Sugar, tea, and water.

Example 3: "Mielie-pap" (Maize Porridge)

Is "mielie-pap" a mixture? Yes.

Is it homogeneous or heterogeneous? It can be either, depending on how well it is mixed. If it's smooth and creamy with no lumps, it's closer to homogeneous. If there are lumps of maize meal, it's heterogeneous.

Components: Maize meal and water.

Guided Practice (With Solutions)

Question 1:

Identify whether each of the following is a mixture or a pure substance:

a) Orange juice with pulp

b) Distilled water

c) Chicken noodle soup

d) Table salt