Share this article:

Matter and its three states

Your child learnt these properties of matter:

1) Solid has fixed shape and volume

2) Liquid has no fixed shape but it has a fixed volume

3) Air has no fixed shape and volume.

Air can be compressed.

 

But before you read on, you might want to download this entire revision notes in PDF format to print it out for your child, or to read it later.

This will be delivered to your email inbox.

Let’s apply the science knowledge to this question.

Example 1

The diagram below shows X found on the pavement.

Which group A, B or C does X belongs to? Explain your answer.

STEP 1

Identify X and its characteristics.

  • Which state of matter is X?
  • Does X have a definite shape?
  • Does X have a definite volume?

 

STEP 2

Trace the flowchart and identify which group X falls into.

 

Piecing your answer together

Answer:

Group B. X is in the liquid state. Like the matter in group B, X has a definite volume but no definite shape.

 

 

Now that you’ve understood the various properties of matter.

It is time to increase the level of difficulty.

 

Let’s try Example 2!

Example 2

The capacity of the container below is 400cm3. It contained 100cm3 of water.

Please follow the sequence in each question.

Question 1

David added 150cm3 of rocks into the container. What was the final volume of the container?

The final volume is 400cm3

Why?

The rocks are in solid state. They have a fixed volume and cannot be compressed.

Water has a fixed volume and it cannot be compressed.

When the rocks are added, the rocks displace the air inside the container. As the air cannot escape, the air is compressed.

Question 2

After David has added the rocks, he pumps 60cm3 of air into the container using the air pump.

What is the final volume of air?

We have to get the answer using mathematics.

Volume of container = 400cm3

Volume of rocks = 150cm3

Volume of water = 100cm3

Volume of air = 400 – 150 – 100 = 150cm3

We do not add in the 60cm3 of air.

Why?
Air has no fixed volume. The air can be compressed and will occupy the remaining space inside the container.

Question 3A

Next, David then removes 50cm3 of water by turning on the tap. What is the final volume of water?

100cm3 – 50cm3 = 50cm3

 

Question 3B

What is the final volume of air after David removes 50cm3 of water based on Question 3A?

Answer: Take 150cm3 of air from question 2, and add 50cm3.

150 + 50 = 200cm3 of air.

 

Why do we add the volume of air?

 

Take note:

You’ve learnt this in school: Air does not have a fixed volume. Air can be compressed.

Many students have the assumption that no fixed volume means air can only be compressed.  That is wrong!

Actually, no fixed volume means the air will occupy the remaining space in the container!

 

Add this Science Knowledge today: Air will always occupy the remaining space inside the container.

For this question, after the rocks and water have occupied the space inside the container, whatever remaining space inside the container belongs to air.

Hence, if you remove 50cm3 of water, the volume of water removed belongs to the volume of air inside the container.

The same concept applies when you remove rocks. If you remove 50cm3 of rocks, that volume of rocks removed belongs to the volume of air inside the container.

Question 4

Finally, David decides to remove 30cm3 of air. What is the final volume of air?

Answer: 200cm3 (same answer as question 3B)

 

Why?

Air has no fixed volume. Air will always occupy the remaining space inside the container.

You can download this revision notes so your child can revise them anytime.

This will be delivered to your email inbox.

Click here for other primary science revision notes >>> https://scienceshifu.com/primary-3-and-primary-4-science-revision-notes/

P3 P4 Science GuideBook

Purchase this P3 P4 Science Revision Guidebook for your child

 

Included inside this ebook:

Over 120 pages of detailed science concepts provided

14 challenging exam-based questions for your child to apply the science concepts.

– Detailed explanation videos of 6 exam-based questions

 

Click on the button below to find out more about this ebook

science lessons for primary school students

Subscribe To Our

Pre-Recorded Science Courses

When you sign up for the Pre-Recorded Courses, your child receives the following:

– Learn the science concepts anytime, anywhere – There are lots of recorded videos and lesson notes to learn and revise the science concepts and answering techniques. Submit the assignments from ScienceShifu and our team of science specialists will mark and reply in 3 to 4 days’ time. 

– 24/7 homework helper – Simply take a picture of the question that your child is unsure of and Whatsapp our homework helpline. Our team of science specialists will reply within 1 day.

 

Click on the button below to find out more about our pre-recorded courses

Enrol your child to

the All-In-One ‘Eureka!’ Program

When you sign up for the All-In-One ‘Eureka!’ Program, your child receives the following:

  • Live Zoom Classes conducted by our passionate teachers.
  • EdaptIQ™ – a smart digital assessment book (An adaptive learning platform to customise quizzes and practices to suit your child’s strengths and weaknesses. We have thousands of exam-based MCQs for your child to practise).
  • 24/7 homework help – Simply take a picture of the question that your child is unsure of and Whatsapp our homework helpline. Our team of science specialists will reply within 1 day.

 

Click on the button below to find out more about our program

Join the ScienceShifu Channel to get the latest learning tips.

 

Benefits of joining ScienceShifu on Telegram:

– Be the first to receive science revision notes from us

– Receive special promotions on all our online courses. 

 

Click on the button below to join the ScienceShifu channel:

Follow the ScienceShifu Instagram Channel to learn more science concepts

 

Benefits of joining Instagram:

– Watch out for interesting posts from ScienceShifu explaining science concepts

– Short videos where I will be going through past year exam questions

 

Click on the button below to follow the ScienceShifu Instagram Channel:

Talk again soon!

Andy Ling – Founder of ScienceShifu.com

Guiding your child to be the master of science concepts

 

Download our free revision notes to help your child prepare for the crucial exams.

Be part of our mailing list to receive the latest offers and learning tips from us.

4 Comments

Leave a Reply

Your email address will not be published. Required fields are marked *

*

Share this article: