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- 1Identify and recall different methods used to separate mixtures in everyday Ghanaian contexts.
- 2Display a clear container with a mixture of sand and water in front of the class. Ask learners: What do you see in this container? What would happen if we left it for 24 hours? Allow 3–4 learners to offer ideas. Show a second container with the same mixture from the previous day and observe that the sand has settled at the bottom. Ask: Why did the sand sink? Learners whisper their answers to a partner first, then select a confident learner to share aloud. Confirm that this is called sedimentation or settling.
- 3Pass around a chart showing four common separation methods: sieving (picture of cassava grating sieve), filtering (picture of cloth used in palm oil extraction), distillation (picture of a still used in traditional alcohol production), and decanting (picture of pouring water from a bucket). Ask learners: Which of these have you seen at home, in the market, or on a farm? Invite volunteers from different sections of the classroom to name one method and describe where they have seen it used. Write three examples on the board: Mama Ama sieving flour at Makola Market, farmers using cloth to filter fresh palm oil, and pouring water carefully from a bucket without disturbing sediment. Learners repeat the separation method names chorally three times.
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- UNDERSTANDING MIXTURE TYPES AND SEPARATION PRINCIPLES
- 1Using the Science kit/specimens and chart/diagram, display three labelled containers: (1) salt water, (2) sand and gravel mixed, (3) oil and water. Ask learners to describe what they observe in each container and identify the state of the materials (solid, liquid, or both). Write on the board: Homogeneous mixture (uniform throughout, like salt water) and Heterogeneous mixture (can see different parts, like sand and gravel). Ask a learner who has not yet contributed to read these definitions aloud. Using a local example, explain: When Kofi buys groundnuts at Kejetia Market and the seller mixes groundnuts with shells (waste), that is a heterogeneous mixture. We must separate the good groundnuts from the shells. Learners write these definitions and one local example in their exercise books.
- 2Divide learners into three ability groups. Provide each group with a different mixture scenario written on a card: Group A (struggling learners) gets sand and water; Group B (average learners) gets sugar solution and sand; Group C (fast finishers) gets oil, water, and food colouring mixed together. Each group must identify whether their mixture is homogeneous or heterogeneous and predict which separation method would work best (sieving, filtering, or decanting). Ask Group A to complete their prediction with teacher support and draw a simple diagram. Ask Group B to explain their reasoning in one sentence. Ask Group C to suggest TWO possible separation methods and justify which is more efficient. One representative from each group shares their answer with the class.
- 3Differentiation note: Struggling learners work with teacher at the front table, using only two separation methods (sieving and decanting). Average learners work in pairs with the chart displayed. Fast finishers: Challenge them to explain what would happen if they tried the wrong separation method (e.g., using a sieve to separate salt from water) and why it would not work.
- 4Emphasize that heterogeneous mixtures have visible different parts and homogeneous mixtures appear uniform to the naked eye. Use market and farm examples consistently to anchor understanding.
- DESIGNING AND PERFORMING A SEPARATION EXPERIMENT
- 5Present a real-world problem from the Learners Resource Pack: Yaw's family has collected rainwater in a barrel, but it contains leaves, sand, and other debris. The family wants to use this water for washing. Model the step-by-step process: (1) Observe what is in the water and predict what separation method is needed. (2) Gather materials: a sieve, cloth, and a container. (3) Use the sieve first to remove large leaves. (4) Use cloth (filter) to remove fine sand. (5) Decant the clean water into a new container. Have learners watch as you demonstrate filtering using cloth over a funnel with sand-water mixture from the Science kit/specimens. Ask: What do you notice happening? Why does water pass through the cloth but sand does not? Learners discuss with a partner, then invite a learner from the middle section to answer. Write on the board: Filtration separates solids from liquids because particles larger than the filter pores cannot pass through.
- 6In pairs, learners perform their own filtration experiment using the Science kit/specimens. Provide each pair with: sand, water, a cloth, a funnel, a container, and a beaker. Learners follow the modelled steps and record their observations in their exercise books using a simple table (What we used | What we observed | What was separated). Circulate and ask each pair: Why did you choose filtering? What would happen if you used a sieve instead? Fast-finishing pairs design an additional experiment: How would you separate sugar from a sugar-salt mixture? They write their plan on a separate sheet. One volunteer from a pair that finished early presents their separation results to the class using their observation table. Learners who completed the core task compare their results with the pair next to them and check whether the separated sand is completely dry.
- 7Differentiation note: Struggling learners perform the experiment with close adult support, completing the observation table with teacher scribing. Average learners work independently in pairs with the chart visible. Fast finishers: Challenge them to evaluate their filtration process and suggest one way to improve it (e.g., using multiple layers of cloth, filtering again if water is still cloudy). Extension: Ask fast finishers to research and sketch another separation method (e.g., distillation) and explain when it would be used.
- 8Ensure all learners wear safety glasses during the filtration activity. Provide cloth strips pre-cut to size and set up funnels in stable containers to prevent spillage. Have paper towels ready for quick cleanup.
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- 1Textbook (pages on mixture separation)
- 2Science kit/specimens (sand, water, salt, oil, cloth, sieve, funnel, beakers, containers)
- 3Chart/diagram (showing separation methods and a flowchart)
- 4Exercise book
- 5Safety glasses
- 6Paper towels
- 7Learners Resource Pack (real-world scenarios)
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- 1Display a flowchart on the chart/diagram titled 'Choosing Your Separation Method'. The chart shows: IF the mixture is two liquids → THEN use distillation; IF large solids are mixed with small solids → THEN use sieving; IF a solid is mixed with a liquid → THEN use filtration. Read through the flowchart with the class. Then present a new scenario: Abena has mixed cassava flour (solid) with water (liquid) to make a paste, but she wants to remove the water and keep the flour dry. Ask learners: Which method from our flowchart should Abena use? Learners whisper their answer to their partner, then show thumbs up if they agree with filtration or thumbs down if they disagree. Invite a learner who chose thumbs down to explain their thinking. Confirm that filtration is correct and explain: The cloth will trap the cassava flour particles and let the water drip through.
- 2Learners work in their same pairs and create a labelled poster showing one separation method they learned today (sieving, filtering, or decanting). The poster must include: (1) the name of the method, (2) a drawing of how it works, (3) one local example of when this method is used in Ghana. For example: Filtering is used when Mama Ama separates palm oil from water at Makola Market. Pairs take turns displaying their posters around the classroom. As each pair presents, the class gives one piece of positive feedback and one question. This consolidates vocabulary and deepens understanding of practical applications.
Exercise
- 1Write in your exercise book: Kwame's mother bought a mixture of rice and small stones from a market seller. Describe the method you would use to separate the rice from the stones. Explain in two sentences WHY you chose this method and what would happen to each material. (Assessment focus: Can learners identify the correct separation method for a heterogeneous solid mixture and justify their choice with scientific reasoning?)
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- 1Recall and list the names and locations of sub-atomic particles found in atoms.
- 2Display a large coloured diagram of an atom on the chart/diagram showing a nucleus with protons and neutrons, and electrons orbiting around it. Ask learners: What do you see in this picture? What are all these tiny things made of? Accept responses and explain: Everything around us—your pencil, your desk, water in the river, even your body—is made of atoms. Atoms are so small we cannot see them with our eyes. But atoms are made of even SMALLER things called sub-atomic particles. Point to each part of the atom diagram and name them: protons (in the nucleus), neutrons (in the nucleus), and electrons (orbiting the nucleus). Ask learners to repeat these three names chorally three times. Then ask: Which particles are found in the centre of the atom? Learners raise their hand to answer. Confirm: Protons and neutrons are together in the centre, called the nucleus.
- 3Using the Textbook, show a simplified picture of a hydrogen atom and a carbon atom. Ask learners: Are these atoms the same or different? What do you think makes them different? Learners discuss with a partner for one minute, then invite a learner from the back of the classroom to share their observation. Explain: Atoms of different elements have different numbers of protons, neutrons, and electrons. For example, hydrogen has only 1 proton, but carbon has 6 protons. This is what makes them different elements. Write on the board in large letters: ATOM = nucleus (protons + neutrons) + electrons. Learners copy this into their exercise books and underline the word 'nucleus'. Ask: What does 'nucleus' mean? Guide them to understand: The nucleus is the centre, like the yolk in an egg.
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- IDENTIFYING SUB-ATOMIC PARTICLES AND THEIR PROPERTIES
- 1Using the Science kit/specimens (or a physical model of an atom if available), display a three-dimensional atom model or draw a large atom on the board. Label the three sub-atomic particles clearly: proton, neutron, electron. Using the chart/diagram, create a comparison table on the board with columns: Particle Name | Location in Atom | Electrical Charge. Ask learners to read the Textbook pages on atomic structure. Then fill in the table together as a whole class: Proton (nucleus, positive charge), Neutron (nucleus, no charge), Electron (orbits nucleus, negative charge). As you fill in each row, explain the meaning: A positive charge is like a magnet's north pole, a negative charge is like the south pole, and no charge means neutral. Learners copy this table into their exercise books. Ask one learner who found this easy to explain aloud: Why are protons and neutrons both in the nucleus? Guide the answer: They are packed tightly together in the small centre of the atom.
- 2Divide learners into three ability groups again. Provide each group with cards showing simple atom diagrams: Group A (struggling learners) gets atoms with only 2–3 particles and must label each particle and state its location. Group B (average learners) gets atoms with 5–8 particles and must label each and state the charge (positive, negative, or neutral). Group C (fast finishers) gets the same atoms as Group B and must also predict the total electrical charge of the atom (e.g., Hydrogen: 1 proton +1, 1 electron −1, total charge = 0). Each group works for 8 minutes. Circulate and provide feedback. Ask Group A: Can you point to the nucleus? Ask Group B: What is the charge on this electron? Ask Group C: Why is the total charge of a neutral atom always zero? One representative from each group shares one labelled atom with the whole class.
- 3Differentiation note: Struggling learners work with enlarged, coloured atom diagrams and use a word bank with particle names. Average learners work with standard diagrams and the table from the board. Fast finishers: Challenge them to explain what would happen if an atom lost one electron (it would become positively charged, or an ion) and design their own atom diagram with more particles.
- 4Use consistent Ghanaian names in all examples (e.g., Ama's atom, Kofi's atom). Emphasize that atoms are electrically neutral because the number of protons equals the number of electrons.
- UNDERSTANDING ATOMIC NUMBER, MASS NUMBER, AND PARTICLE CALCULATIONS
- 5Introduce the concept of atomic number using the periodic table from the Textbook or chart/diagram. Point to hydrogen (H, atomic number 1) and explain: The atomic number tells us how many protons an atom has. Hydrogen has 1 proton, so its atomic number is 1. Show carbon (C, atomic number 6): Carbon has 6 protons, so its atomic number is 6. Write on the board: Atomic Number = Number of Protons. Now introduce mass number. Write below: Mass Number = Protons + Neutrons. Using an example from the Learners Resource Pack, show carbon-12: It has 6 protons and 6 neutrons, so the mass number is 12 (written as C-12 or ¹²C). Ask learners: If atomic number = protons and I know carbon has atomic number 6, how many protons does carbon have? Learners answer in unison: 6. Then ask: If carbon-12 has a mass number of 12 and we know it has 6 protons, how many neutrons does it have? Work through the calculation together: 12 − 6 = 6 neutrons. Write the formula on the board: Number of Neutrons = Mass Number − Atomic Number. Learners copy both formulas into their exercise books.
- 6In pairs, learners practise calculating sub-atomic particles using worked examples from the Textbook. Provide three elements: Oxygen (O, atomic number 8, mass number 16), Nitrogen (N, atomic number 7, mass number 14), and Magnesium (Mg, atomic number 12, mass number 24). For each element, learners must: (1) State the number of protons (= atomic number). (2) Calculate the number of neutrons (mass number − atomic number). (3) State the number of electrons (= protons in a neutral atom). Pairs complete a calculation table in their exercise books. Fast-finishing pairs are given an extension: Choose one element from the periodic table in the Textbook and calculate all three sub-atomic particle numbers. They can also research and sketch the electron shell arrangement for their chosen element. Invite a learner from a pair that finished early to present their calculations for one element to the class, showing their working step by step.
- 7Differentiation note: Struggling learners work with only two elements (oxygen and nitrogen), with the formulas written on a card they can reference. Teacher guides them through the first calculation step by step. Average learners work independently with all three elements and the formulas visible. Fast finishers: Challenge them to explain the difference between atomic number and mass number in one sentence and predict the mass number of an isotope (e.g., carbon-14 vs carbon-12) if they can research it.
- 8Use a consistent calculation format on the board so learners can follow the method. Encourage learners to write the formula and substitute numbers before calculating. Provide a partially completed table for struggling learners to reduce cognitive load.
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- 1Textbook (pages on atoms, sub-atomic particles, periodic table)
- 2Science kit/specimens (physical atom model if available, or diagram templates)
- 3Chart/diagram (large atom diagram, periodic table, atomic structure comparison table)
- 4Exercise book
- 5Periodic table (printed or displayed)
- 6Learners Resource Pack (examples of elements with atomic numbers and mass numbers)
- 7A3 paper and markers (for plenary posters)
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- 1Display a large unlabelled atom diagram on the chart/diagram with 2 protons, 2 neutrons, and 2 electrons visible. Ask learners: What is this atom? What is its atomic number? What is its approximate mass number? Give learners 2 minutes to discuss in pairs and write their answers in their exercise books. Invite a learner from a group of three sitting together to share the atomic number (2, therefore this is helium). Ask another learner: If this atom has 2 protons and 2 neutrons, what is the mass number? Work through: 2 + 2 = 4, so mass number is 4 (helium-4). Ask the class: Are there any electrons? Count them together: yes, 2 electrons. So this atom is neutral because protons = electrons. Learners confirm by raising both hands if they agree. This consolidates the relationship between particle numbers and element identity.
- 2Learners work in groups of 3 or 4 to create a visual summary poster titled 'All About Atoms'. The poster must include: (1) a labelled diagram of an atom showing protons, neutrons, and electrons; (2) a definition of each sub-atomic particle in their own words; (3) one example of an element with its atomic number and mass number (e.g., Oxygen-16); (4) a sentence explaining why atoms are electrically neutral. Provide A3 paper, markers, and access to the Textbook and periodic table. Each group displays their poster. As groups present, the class listens and gives one strength and one suggestion for improvement. This reinforces key vocabulary and builds collaborative communication.
Exercise
- 1Using the periodic table in the Textbook, choose the element Nitrogen (N, atomic number 7, mass number 14). In your exercise book, write: (a) How many protons does nitrogen have? (b) Using the formula Number of Neutrons = Mass Number − Atomic Number, calculate how many neutrons nitrogen has. Show your working. (c) How many electrons does a neutral nitrogen atom have? (d) In one sentence, explain why the number of protons equals the number of electrons in a neutral atom. (Assessment focus: Can learners accurately identify and calculate sub-atomic particle numbers using atomic number and mass number, and explain the principle of electrical neutrality?)
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