Review and refine (T1 W7)
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Move from lesson study to exam practice in Natural Science.
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In this section, we will revisit the major topics covered in Term 1, including the structure of atoms, the periodic table, and basic chemical reactions. It is essential to grasp these concepts as they form the foundation for more advanced studies 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. Here, we see that two molecules of hydrogen react with one molecule of oxygen to produce two molecules of water. This example illustrates the law of conservation of mass, where the number of atoms before and after the reaction remains constant.
Students will participate in a vocabulary matching activity where they will match scientific terms with their definitions. For example, students will match 'element' with 'a pure substance that cannot be broken down into simpler substances.' This activity will help reinforce their understanding of key terms and ensure they can use them accurately in context.
For this task, students will write a short paragraph reflecting on what they found easy and challenging during the review activities. They will also create a simple diagram illustrating a chemical reaction of their choice, labeling the reactants and products. This will allow them to apply their learning creatively and assess their understanding of the concepts.
Answer: Atom
An atom is the basic unit of a chemical element, consisting of protons, neutrons, and electrons.
Answer: Helium
Helium is a noble gas, which means it is inert and does not readily react with other elements.
Answer: A chemical reaction is a process that leads to the transformation of one set of chemical substances to another.
Chemical reactions involve the breaking and forming of bonds between atoms, resulting in new substances.
Answer: Elements by atomic number
The periodic table arranges elements in order of increasing atomic number, which reflects the number of protons in an atom.
Answer: H₂O
In this reaction, water (H₂O) is produced as a result of the combination of hydrogen and oxygen.
Answer: The law of conservation of mass states that mass is neither created nor destroyed in a chemical reaction.
This law implies that the total mass of reactants equals the total mass of products in a chemical reaction.
Answer: A pure substance that cannot be broken down
An element is a fundamental substance that cannot be simplified into simpler substances through chemical means.
Answer: Combustion and photosynthesis.
Combustion is a reaction where a substance combines with oxygen, while photosynthesis is the process by which plants convert sunlight into chemical energy.