part 1introduction part 2what are the properties of acids? what precautions we have to take in...
TRANSCRIPT
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• Part 1 Introduction
• Part 2 What are the properties of acids? What precautions we have to take in diluting acid?
• Part 3 Daily examples of acids
• Part 4 Questions
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In this lesson, we use• pictures to recall
students’ memory • photos and graphics to
show the properties of acid
• sound effect in the quiz
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• Introduction of acids
in daily life
• Properties of acids
• Common use of acids
• Danger of acids
• A small quiz
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What acidic substance can we find in daily life?
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• Most acids have a sour taste.
• The word “acid” means “sour”.
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• Acids show a pH test colour of orange or red.
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• Acidity can be measured by pH meter.
• Acids show the pH in the range from 1 to 6.
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• All dilute acids can conduct electricity.
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• Concentrated acids are very corrosive and represented by a symbol as :
C O R R O SIVE
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Corrosive properties
of acids
On metal
On cloth/paper
Acid rain on marble
Metal terminal of battery
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• Dehydration of sugar
sugar + acid carbon
+
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• Volatile
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• Fruits(e.g. oranges, lemons and pineapples) contain citric acid
• Common Household Acids
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ACIDS
Name Formula Locations
Acetic acid HC2H3O2 Vinegar
Acetylsalicylic acid HC9H7O4 Aspirin
Ascorbic acid H2C6H6O6 Vitamin C
Citric acid H3C6H5O7 Lemon juice, citrus fruits
Hydrochloric acid HCI Gastric juices(digestive fluid in stomach)
Sulfuric acid H2SO4 Batteries
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• Soft drinks contain carbonic acid.
• Vinegar and tomato sauce contain ethanoic acid.
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• Yoghurt and sour milk contain lactic acid.
• Tea contains tannic acid.
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• Domestic cleaners contain methanoic acid.
• Car battery contains sulphuric acid.
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• Our stomach secretes hydrochloric acid to help us digest food.
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Concentrated acid
Adding water
A lot of heat is given out and cause acid to jump out.
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water
Adding concentrated acid
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Wearing goggle
Wearing gloves
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Click T or F for the correct answer .
For correct answer For incorrect answer
1. Vinegar is a dilution solution of ethanoic acid. T/F
2. Most acids have a bitter taste. T/F
3. Acids can turn litmus paper from red to blue. T/F
4. Acid-alkali neutralizations produce salts. T/F
5. When you dilute a concentrated acid, always
add the acid slowly to a large amount of water. T/F
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