Year 9 Science

Week beginning 20th July

Note: 9b/Sc4 have been sent separate work by Mr Burlace and Miss Bloomfield - please check your Academy email weekly.

This week's video seminar

Scroll down for this week's tasks.

Learning intentions

  • Describe why solutions are acidic or alkaline

  • Explain how to use universal indicator to measure the approximate pH of a solution

  • Describe how to use the pH scale to identify acidic or alkaline solutions

  • Investigate pH changes when a strong acid neutralises a strong alkali

  • Explain how to use the terms dilute and concentrated, and weak and strong in relation to acids

  • Describe how the concentration of hydrogen ions in a solution affects the numerical value of pH

Total study time this week: 3 hours

Office hours

If you have any questions or need support, please join our drop-in Q&A session on Google Meet at the time shown below.

You can also email your teacher at any time please see below for their emails.

C5 Chemical Change

• This week we will continue to look at chemical reactions between acids and various compounds.

  • Complete all the tasks outlined below. You can do your work on paper, in a notebook, on PowerPoint, or a word document. You will be recapping some of this information about acids, metals, bases, alkalis and ionic compounds from KS3 and topic C1.

  • You would normally have three hours of science lesson in school so the tasks have been split into chunks to help you manage your time. You can do them all at once or in separate chunks.

  • Watch the seminar above and download the lesson PowerPoint here


Lesson 1: Neutralisation and the pH scale

  1. Do your daily goal on Tassomai (15mins)

  2. Watch the loom video above and complete the tasks as stated in the instructions on the PowerPoint. You can download the PowerPoint here

Task 1 Read this webpage and watch this video. Once you have read and watched the video for a second time. Write a summary of the important information and equations using the tier 2/3 words listed in the PowerPoint. (15 minutes)

Task 2 Match the features of acids and alkali shown on the PowerPoint (5 minutes)

Task 3 Match the acid, neutral or alkali to its pH in the boxes shown on the PowerPoint. (5 minutes)

Task 4 Have a look at this video; once you have viewed the video use the results on the PowerPoint to plot a graph of pH (y axis) against volume of acid added (x axis). If you do not have graph paper, sketch the graph on A4 plain paper. (15 minutes)


Lesson 2: How do you measure acidity or alkalinity?

  1. Do your daily goal on Tassomai (15mins)

Task 5 Watch this video and then compare the advantages and disadvantages of the use of universal indicator paper or a pH sensor/probe attached to a data logger in finding the pH of a solution. Include these tier 2/3 words in your answer: estimate, precise, accurate and subjective. Google or use a dictionary for any words you do not know the meaning of. (35 minutes)

Task 6 Watch this video. Explain in detail how you could use universal indicator paper/solution as a way of distinguishing between distilled water, sodium hydroxide solution and ethanoic acid solution (20 minutes)


Lesson 3: What do we mean by strong and weak acids?

  1. Do your daily goal on Tassomai (15mins)

Task 7 Read this webpage and watch this video. Once you have read the webpage and watched the video answer the following questions:

  1. Propanoic acid is an organic acid. Explain in detail why propanoic acid C2H3COOH is described as a weak acid, whereas nitric acid HNO3 is a strong acid.

  2. Explain why it is possible to have a very dilute solution of a strong acid, with a higher pH value than a concentrated solution of a weak acid. (15 minutes)

Task 8 Review: Complete this google quiz (10 minutes)