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PROJECT 4: ONLINE LEARNING

TOPIC: Acid and Alkali

LEARNING OBJECTIVES

A student is able to:

  1. Defining operationally acid and alkali. (in terms of pH)

  2. Explain with examples of acidic and alkaline substances.

  3. Use a pH scale and indicators to distinguish acidic and alkaline substances

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Instruction 1

1. There is a situation.

​Last weekend, Julia went to Tesco hypermarket near her house to buy stationery for her little sister. she found that there are lots of things can be found at Tesco. Some of the things are:

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2. From these pictures, classify the substance into ACID and ALKALI.

3. Write down your answer on a piece of paper. You can check whether your prediction is correct or wrong later.

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Instruction 2

1. Acid and alkali have different properties.

2. Using the following words as leads, construct a MIND MAP  to show the characteristics of acids and alkali.

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3. Below is an example of mind map. You must come up with your own!​

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4. Acid and alkali only show their properties in the presence of water, hence some substance must be dissolved in water first to check their reaction with litmus paper.

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Instruction 3

1. Let's watch a video. from this video, I want you to answer the following questions:

  • What is an indicator?

  • Give example of indicators that you know.

  • Hence, what is the role of litmus paper?

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2. Let's check your answers.

  • What is an indicator?

  • Give example of indicators that you know.

  • Hence, what is the role of litmus paper?

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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3. We use indicators to distinguish acidic and alkaline substances. To determine the strength of an acid or an alkali, we can use pH scale. Look at the following pictures and answer the following questions:

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  • Based on the pictures, which one is more acidic? Lemon or vinegar?

  • Which one is less alkaline? Baking soda or ammonia?

  • If I have a bottle of sulphuric acid, where do you think will it be in the pH scale?

 

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4. The more acidic the substance, the lower pH value it has. The more alkaline a substance is, the higher the pH value it has.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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  • pH of lemon is while vinegar has a pH of 3. Lemon is more acidic than vinegar.

  • Baking soda has pH of 9, ammonia has pH of 11. Baking soda is less alkaline than ammonia.

  • Sulphuric acid is very corrosive, hence very alkaline. Its pH must be 13 to 14.

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You can play PHET simulations to find out which substances are strong acids, weak acids, strong alkalis and weak alkalis. Click this button to explore more. 

ANSWERS

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Cool things to check out!

CONCLUSION
CONCLUSION

Both acids and alkalis are corrosive

 

Acids turn blue litmus paper red whereas alkali turns red litmus paper blue

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An indicator determines the acidity and alkalinity of a substance

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The more acidic the substance, the lower pH value it has. The more alkaline a substance is, the higher the pH value it has

ASSESSMENT

To test your understanding in this topic, there will be two types of assessments.

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  1. First, you need to upload your mind map on the characteristics of acid and alkali in our Google classroom.​

    • Open Google browser. Go to classroom.google.com and click Sign In. Sign in with your Google Account.

    • At the top, click Add Join class.

    • Enter the class code p3o6en and click Join. The class name is "SciFun with MizzBie".

    • Upload your mind map there.

  2. Second, your favourite part! You need to answer quiz on Kahoot!

  • You can go to this link - https://kahoot.it/challenge/0973807

  • OR you can follow the link that I share in our Google Classroom

  • Make sure that you use your REAL name or else your mark will not be recorded.

  • This will be 5% of your Test 1 mark.

ALL THE BEST!
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