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Questions and Answers
What is the primary reason for cleaning the magnesium ribbon with sandpaper before burning it in air?
What is the primary reason for cleaning the magnesium ribbon with sandpaper before burning it in air?
What is the result of the transformation of a chemical substance into another chemical substance?
What is the result of the transformation of a chemical substance into another chemical substance?
What is the term for the new substance produced as a result of a chemical reaction?
What is the term for the new substance produced as a result of a chemical reaction?
What is the characteristic of the chemical reaction between zinc and dilute sulphuric acid?
What is the characteristic of the chemical reaction between zinc and dilute sulphuric acid?
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What happens to the atoms in a chemical reaction?
What happens to the atoms in a chemical reaction?
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What is the term for the substances that take part in a chemical reaction?
What is the term for the substances that take part in a chemical reaction?
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What is the characteristic of the chemical reaction between citric acid and purple coloured potassium permanganate solution?
What is the characteristic of the chemical reaction between citric acid and purple coloured potassium permanganate solution?
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What is the product of the combustion reaction of candle wax?
What is the product of the combustion reaction of candle wax?
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What is the direction of the arrow in a chemical equation?
What is the direction of the arrow in a chemical equation?
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What is the type of chemical equation that has the number of atoms of each element equal on both sides?
What is the type of chemical equation that has the number of atoms of each element equal on both sides?
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What is the chemical reaction that is characterised by a change in temperature and formation of a white precipitate?
What is the chemical reaction that is characterised by a change in temperature and formation of a white precipitate?
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What is the law that states that mass can neither be created nor destroyed in a chemical reaction?
What is the law that states that mass can neither be created nor destroyed in a chemical reaction?
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Study Notes
Chemical Reaction
- Chemical Reaction: Transformation of one substance into another, e.g. rusting of iron, setting of milk into curd, digestion of food, respiration, etc.
- Characteristics of Chemical Reactions:
- Evolution of gas: e.g. Zn + H2SO4 → ZnSO4 + H2
- Change in Colour: e.g. citric acid and potassium permanganate solution
- Change in state of substance: e.g. combustion of candle wax (solid → liquid → gas)
- Change in temperature: e.g. quick lime water to form slaked lime
- Formation of precipitate: e.g. sulphuric acid and barium chloride solution
Chemical Equation
- Chemical Equation: Representation of chemical reaction using symbols and formulae of substances
- Example: A + B → C + D (A and B are reactants, C and D are products)
- Types of Chemical Equations:
- Balanced Chemical Equation: Number of atoms of each element equal on both sides, e.g. Zn + H2SO4 → ZnSO4 + H2
- Unbalanced Chemical Equation
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Description
Learn about chemical reactions, the process of transforming one substance into another, and the resulting changes in properties. Explore examples like rusting of iron and digestion of food.
