Review and refine (T2 W5)
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Move from lesson study to exam practice in Natural Science.
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In this section, we will review the fundamental concepts covered in Term 2, including the structure of atoms, the periodic table, and chemical reactions. Understanding these concepts is crucial as they form the foundation for more complex topics in Natural Science. We will discuss how atoms combine to form molecules and the significance of the periodic table in predicting the properties of elements.
Consider the reaction between hydrogen and oxygen to form water. The balanced equation is 2H₂ + O₂ → 2H₂O. In this example, we see how two hydrogen molecules react with one oxygen molecule to produce two water molecules. This illustrates the law of conservation of mass, where the number of atoms before and after the reaction remains the same.
Students will participate in a vocabulary matching activity where they will match key terms with their definitions. Terms include 'element', 'compound', 'mixture', and 'reaction'. This activity will help reinforce their understanding of these essential concepts and ensure they can use the vocabulary correctly in context.
For independent practice, students will create a concept map that illustrates the relationships between different scientific concepts learned in Term 2. They should include at least five key terms and their connections. This visual representation will help them organize their thoughts and deepen their understanding of how these concepts interrelate.
Answer: Atom
An atom is the basic unit of a chemical element, consisting of protons, neutrons, and electrons.
Answer: Burning wood
Burning wood results in a new substance being formed, which is characteristic of a chemical change.
Answer: Elements by atomic mass
The periodic table organizes elements based on their atomic number and mass, reflecting their properties.
Answer: A compound is a substance formed when two or more different elements chemically bond together.
Compounds have unique properties that differ from the individual elements that compose them.
Answer: Saltwater
Saltwater is a mixture of salt and water, where both components retain their individual properties.
Answer: The law of conservation of mass states that mass is neither created nor destroyed in a chemical reaction.
This principle means that the total mass of reactants equals the total mass of products.
Answer: Boiling water
Boiling water is a physical change because it changes state from liquid to gas without altering its chemical composition.
Answer: Oxygen and Hydrogen.
Oxygen and Hydrogen are both pure substances that cannot be broken down into simpler substances.