Podcast
Questions and Answers
What is the first step when testing the odour of cloth strips?
What is the first step when testing the odour of cloth strips?
- Add clove oil
- Add vanilla essence
- Rinse with water (correct)
- Add HCl
What type of solution is used to test the change in odour of vanilla essence?
What type of solution is used to test the change in odour of vanilla essence?
- Dilute HCl solution (correct)
- Concentrated salt solution
- Sugar solution
- Vinegar
Which substance is reacted with dilute sulfuric acid in Activity 2.3?
Which substance is reacted with dilute sulfuric acid in Activity 2.3?
- Iron nails
- Silver powder
- Zinc granules (correct)
- Copper filings
What is observed on the surface of zinc granules when they react with dilute sulfuric acid?
What is observed on the surface of zinc granules when they react with dilute sulfuric acid?
What is passed through the soap solution in the experiment?
What is passed through the soap solution in the experiment?
What happens to the gas-filled bubble when a burning candle is brought near?
What happens to the gas-filled bubble when a burning candle is brought near?
Besides sulfuric acid, which other acid is used in the experiment?
Besides sulfuric acid, which other acid is used in the experiment?
What is the main purpose of using vanilla essence and clove oil in the first part?
What is the main purpose of using vanilla essence and clove oil in the first part?
In the experiment with acids and zinc, what does the production of gas indicate?
In the experiment with acids and zinc, what does the production of gas indicate?
What is the cautionary advice given before starting activity 2.3?
What is the cautionary advice given before starting activity 2.3?
Flashcards
Olfactory Indicators
Olfactory Indicators
Substances that change their odor in different pH levels.
Dilute Vanilla Essence
Dilute Vanilla Essence
A flavoring that can serve as an olfactory indicator.
Clove Oil
Clove Oil
An oil that can also act as an olfactory indicator.
Acids
Acids
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Bases
Bases
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Reaction with Metals
Reaction with Metals
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Hydrogen Gas
Hydrogen Gas
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Zinc Granules
Zinc Granules
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Bubbles in Soap Solution
Bubbles in Soap Solution
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Observations in Acids
Observations in Acids
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Study Notes
Olfactory Indicators
- Vanilla, onion, and clove can be used as olfactory indicators to identify acids and bases based on odour changes.
Reaction of Acids and Bases with Metals
- Activity: Using zinc granules with dilute sulfuric acid.
- Procedure: Set up the apparatus as shown. Add dilute sulfuric acid to a test tube. Add zinc granules.
- Observations: Observe the surface of zinc granules. Pass the evolved gas through soap solution. Note if bubbles form in the soap solution. Bring a lit candle near a bubble.
- Conclusion: Note observations and repeat activity with other acids to compare.
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