Podcast Beta
Questions and Answers
What is the primary purpose of adding acid to zinc granules in Activity 1.3?
What is the product formed when magnesium ribbon is burnt in oxygen?
What is the direction of the arrowhead in a word-equation?
What is the reactant that undergoes chemical change in the reaction mentioned in Activity 1.1?
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What is the purpose of writing a chemical equation in a shorter form?
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What is the result of the reaction between magnesium and oxygen?
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What is the significance of the plus sign (+) in a word-equation?
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What is the term used to describe the new substance formed during a chemical reaction?
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What is the primary purpose of Activity 1.1?
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What is the characteristic of a chemical reaction, as observed in the activities?
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What is the outcome of burning a magnesium ribbon in air, as observed in Activity 1.1?
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What is the purpose of using sandpaper in Activity 1.1?
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Which of the following is NOT a characteristic of a chemical reaction?
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What is the purpose of wearing eye protection in Activity 1.1?
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What is the outcome of the action of dilute sulphuric acid on zinc, as observed in Activity 1.2?
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What is the quote 'Facts are not science — as the dictionary is not literature' implying?
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Study Notes
Chemical Changes and Reactions
- Daily life situations like leaving milk at room temperature, exposing iron to humid air, fermenting grapes, cooking, and digestion all involve changes in the nature and identity of the initial substance.
Chemical Reactions
- A chemical reaction occurs when a chemical change takes place.
- Ways to determine if a chemical reaction has occurred:
- Change in state
- Change in color
- Evolution of a gas
- Change in temperature
- Chemical reactions are happening around us, and there is a large variety of them.
Chemical Equations
- A chemical equation is a concise way to represent a chemical reaction using symbols.
- A word-equation is a simple way to describe a chemical reaction in sentence form.
- The word-equation for the reaction of magnesium and oxygen is: Magnesium + Oxygen → Magnesium oxide
- Reactants (magnesium and oxygen) are written on the left-hand side (LHS) with a plus sign (+) between them.
- Products (magnesium oxide) are written on the right-hand side (RHS) with a plus sign (+) between them.
- The arrowhead points towards the products, showing the direction of the reaction.
Representing Chemical Equations
- Chemical equations can be made more concise and useful by using chemical formulae instead of words.
- A chemical equation represents a chemical reaction, and can be written in a concise and symbolic form.
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Description
This quiz explores the chemical changes that occur in everyday situations, such as when milk is left at room temperature, an iron object is exposed to humidity, and food is cooked or digested.
