Origami pen holder

Looks fun to make~

Breakfast with CTs

This was my very last "breakfast with CTs", and the last time I'm walking around school while it's so full of students and full of life... it is the last day of school and marks the end of my 5.5 years with the school. I will remember my colleagues and students fondly as these few years have been filled with wonderful memories.

I'm a little sorry for myself that I didn't get to have "breakfast with CTs" with my own class this year, as I was on maternity leave during the mid-year one while today, my students are already enjoying their post N-levels holidays. 4C'15, I wish you all the best in everything you do~ I'll see you when your results are released. 

My teaching experience in this school has been enriching and incredible. Thank you everyone for the wonderful 5.5 years (actually almost 6 years if including my practicum) that I will not forget.

All the best for everyone!!

Breakfast with 3A

Breakfast with 3H

Heart

Best big boss. (Click here to read the article in The Straits Times)

Mr Lee's Red Box

Message by the Minister of Education

Click here to read our Minister for Education’s Message to Students on Mr Lee Kuan Yew (1923 - 2015) on MOE website.

Van Gogh's "Starry Night" comes to life

Watch Van Gogh's "Starry Night" painting come to life: 

Step (1) Stare, only at the centre, of the moving spiral image (top) for 30 seconds 

Step (2) Look at Van Gogh's 'Starry Night' (bottom), and watch it come to life

Mixture and compound

Iron and sulfur - as mixture and as compound (iron sulfide)

Chemical reaction of iron with sulfur to form iron sulfide

And here's a BBC Bitesize link on creating iron sulfide.

Remove distractions while walking

When you walk

• your eyes shouldn't be glued to the tiny screen in your hand.
• your ears shouldn't be plugged with the buds blasting music.

Click above to watch on YouTube what happens when one's walking with dangerous distractions.

Household Energy Consumption in kWh

Why is the joule not used as a unit of the total electrical energy used in an average household?

Joule is a very small unit for household electrical consumption and the numbers will become very large for calculation. It will be more convenient to calculate total electrical energy used in an average household using kWh.

Check out this BBC - GCSE Bitesize link on Practical Electricity - using kWh for household energy consumption.

Compounds

The links of these videos are shared in the sec 1 notes on Chapter 3 - Exploring Diversity of Matter by its Chemical Composition. Here are the YouTube videos on compounds for easy access.

Slide 16 (one video on chemical reaction to form a compound)

Slide 17 (two videos on more chemical reactions to form compounds)

And here's the Periodic Table Song.

Malleability and Ductillity

This video was shown in 1B today when we were going through the differences between metals and non-metals (Chapter 3: Exploring Diversity of Matter by its Chemical Composition).

Reflection on Total Defence Day

THINK BACK

• What is the significance of Total Defence for Singapore?
• Why is Total Defence important?

LEARN FROM IT

• What values and attitudes are essential in keeping Singapore safe and secure?

DO IT BETTER

• As we pursue our personal aspirations, what can we do for our family / school / community for Total Defence?

Please do your reflection in the last two pages of your CCE Reflection Journal.

Updated on 16 February: Did you hear the sirens sound off at 6:20pm yesterday? Do you know why the sirens went off at 6:20pm?

A video on total internal reflection

What is a tangent to circle?

Tangent to a circle: A line that contacts an arc or circle at only one point.
Tangent line is always at right angles to the radius at the point of contact.

Check this out for an interactive experience with a tangent to a circle.

We were talking about tangent to a circle in 3H on 27 January 2015, when discussing the total internal reflection in a semi-circular glass block.

Does diamond conduct electricity?

The answer is no. Diamond is hard and has high melting point, but it does not conduct electricity as there are no free electrons in diamond.

Read up more about the properties of diamond here.

This question was raised by 1B on 21 January 2015 in the chemistry lab.

Vernier calipers simulator

Go to this link and scroll down to the simulator that looks like this:

Please take note that  while the main scale is in centimetres, the reading shown is in millimetres. Therefore, the reading of the measurement shown above is 0.75 cm or 7.5 mm.

Micrometer simulator

Click on the diagram below to go to a simulation on micrometer screw gauge.

Uses of electrostatics

Photocopying and laser printing are just some of the uses of electrostatics. 

See more uses at this BBC link.