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Questions and Answers
What is the outcome when a magnesium ribbon is burned in air?
What is the outcome when a magnesium ribbon is burned in air?
- Carbon dioxide is released.
- Magnesium oxide is formed. (correct)
- Oxygen is consumed.
- Water is produced.
What happens to the nature and identity of the initial substance in the given daily life situations?
What happens to the nature and identity of the initial substance in the given daily life situations?
- They disappear completely.
- They remain unchanged.
- They change completely. (correct)
- They change partially.
Why is it necessary to wear eye protection during Activity 1.1?
Why is it necessary to wear eye protection during Activity 1.1?
- To protect from the magnesium ribbon sparks.
- To protect from the spirit lamp flame. (correct)
- To prevent the ash from getting into the eyes.
- To avoid the magnesium oxide powder.
What is the purpose of rubbing the magnesium ribbon with sandpaper?
What is the purpose of rubbing the magnesium ribbon with sandpaper?
What is the name of the process when grapes turn into wine?
What is the name of the process when grapes turn into wine?
Who is quoted as saying 'Facts are not science — as the dictionary is not literature'?
Who is quoted as saying 'Facts are not science — as the dictionary is not literature'?
What is a common indicator that a chemical reaction has taken place?
What is a common indicator that a chemical reaction has taken place?
What is the purpose of adding potassium iodide solution to lead nitrate solution in Activity 1.3?
What is the purpose of adding potassium iodide solution to lead nitrate solution in Activity 1.3?
What is the product formed in the reaction between magnesium and oxygen?
What is the product formed in the reaction between magnesium and oxygen?
What is the significance of the arrowhead in a word-equation?
What is the significance of the arrowhead in a word-equation?
What is the purpose of writing a chemical reaction in a word-equation form?
What is the purpose of writing a chemical reaction in a word-equation form?
What should be handled with care in Activity 1.3?
What should be handled with care in Activity 1.3?
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Study Notes
Chemical Reactions in Daily Life
- Milk left at room temperature during summers undergoes a change, indicating a chemical reaction
- An iron tawa/pan/nail exposed to humid atmosphere undergoes rusting, a chemical reaction
- Fermentation of grapes results in a chemical reaction
- Cooking and digestion of food in the body involve chemical reactions
- Respiration is a process that involves chemical reactions
Identifying Chemical Reactions
- A chemical reaction involves a change in the identity and nature of the initial substance
- Observations that help determine whether a chemical reaction has taken place include:
- Change in state
- Change in color
- Evolution of a gas
- Change in temperature
Activity 1.1: Burning of Magnesium Ribbon
- Magnesium ribbon burns with a dazzling white flame when heated in air
- The reaction results in the formation of magnesium oxide, a white powder
- The reaction can be described as: Magnesium + Oxygen → Magnesium oxide
Chemical Equations
- A word-equation is a short way to describe a chemical reaction
- The word-equation for the burning of magnesium ribbon is: Magnesium + Oxygen → Magnesium oxide
- Reactants are the substances that undergo chemical change, written on the left-hand side (LHS) with a plus sign (+) between them
- Products are the new substances formed during the reaction, written on the right-hand side (RHS) with a plus sign (+) between them
- The arrowhead points towards the products and shows the direction of the reaction
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