In this chapter, we will learn about acids and alkalis.
We can test if something is acidic, alkaline, or neutral by using litmus paper.
If the paper changes color to red, it is acidic.
If it changes to blue or green, it is alkaline.
We can also use our taste and touch to make generalizations about substances.
For example, lemon juice tastes sour, so it is acidic.
Soap feels slippery, so it is alkaline.
Let's have fun investigating and testing different substances to learn more about acids and alkalis!
• Test acidic, alkaline and neutral substances through changes in colour of litmus paper by carrying out investigation
• Make generalisation on acidic, alkaline and neutral substances through taste and touch by testing a few substances
• Explore other materials to test acidic, alkaline and neutral substances
• Explain the result of observations about acid and alkali through written or verbal forms, sketches or ICT in a creative way
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