Maths Quiz

The activity for today is Mathematics Quiz.

1. What is the next number in the series.

15, 29, 56, 108, 208, ?

2. Find the next number in the sequence

5, 12, 24, 36, ?

3. What is the probability of choosing the correct answer at random from the options below.

a. 1/4

b. 1/2

c. 1

d. 1/4

4. Using eight eights and addition only, can you make 1000?

5. Manish and Manoj play 5 game of chess.

Both Manish and Manoj won exactly same number of games. There is no tie at all. How?

6. A frog fell on the bottom of the well.

The well is 30 feet deep.

During day time, the frog jumps 5 feet while at night when the frog sleeps he slip 4 feet back.

In how many days will the frog come out from well.

Maths Quiz

The activity for today is Mathematics quiz.

1. Fred can eat 27 chocolates in an hour, Alice can eat 2 chocolates in 10 minutes and Kelly can eat 7 chocolates in 20 minutes. How long will it take for them to share and eat a large box of 120 chocolates while watching a movie ?

2. From a pack of 52 cards, 4 cards are placed on the table.
You're given 4 clues about the 4 cards:
Clue 1: Card on the left cannot be greater than card on the right.
Clue 2: The difference between first card and third card is 8.
Clue 3: There is no card of ace.
Clue 4: The difference between second card and forth card is 7.
Identify the 4 cards.

3. Solve the maths equation in the picture below by placing the 1 to 9 into the boxes so that all the 3 equations are correct.

4. There are 4 big houses in the town, each houses are made of red marbles, green marbles, white marbles and blue marbles.
Miss Jennifer's house is on the left of the green marbles house and white marbles house is located at third.
Miss Sharon owns a red marbles house and Mr Cruz's house is located neither the end of left nor right., but located at somewhere on the right of the blur marbles house.
Mr Danny lives at the forth house, while the first house is not made of red marbles.
Can you tell who lives in house made of what color of marbles?

Colourful Convection Currents

Our experiment today is Colourful Convection Currents.

Convection is one of those words that we often hear used, but we may not completely understand its meaning. Weather forecasters show how convection currents are formed when warm and cold air masses meet in the atmosphere. Convection currents are responsible for warm water currents that occur in oceans. This activity demonstrates convection currents in a very colorful fashion.

Materials
Four empty identical bottles (mouth of the bottle should be at least 1 1/2 inches in diameter) or use our Split Demo Tank
Access to warm and cold water
Food colouring
3 x 5 inch index card or an old playing card

Procedure

Fill two bottles with warm water from the tap and the other two bottles with cold water. Use food coloring to color the warm water yellow and the cold water blue. Each bottle must be filled to the brim with water.

Hot over cold: Place the index card or old playing card over the mouth of one of the warm water bottles. Hold the card in place as you turn the bottle upside down and rest it on top of one of the cold water bottles. The bottles should be positioned so that they are mouth to mouth with the card separating the two liquids. You may want to do this over a sink.

Carefully slip the card out from in between the two bottles. Make sure that you are holding onto the top bottle when you remove the card. Observe what happens to the colored liquids in the two bottles.

Cold over hot: Repeat steps 2 and 3, but this time place the bottle of cold water on top of the warm water.


The movement of warm and cold water inside the bottles is referred to as the convection current. In our daily life, warm currents can occur in oceans, like the warm Gulf Stream moving up north along the American Eastern Seaboard. Convection currents in the atmosphere are responsible for the formation of thunderstorms as the warm and cold air masses collide.

[Source from: http://www.stevespanglerscience.com/lab/experiments/colorful-convection-currents]

Summary for 2012/2013

A short summary on activites we have done.

Let's have a look

1. Oxidation States of potassium permanganate and Whoosh bottle experiment
2. Fire water balloon
3. Sinking smoke
4. Gummy bears and potassium chloride
5. Fireballs and thunders
6. Can crushing
7. Quiz
8. Chemical garden
There is a few combine meetings with the lower form members as well

I think all the members did enjoy the activities that have been carried out. 
Its time to step down and let the newbies do their job! All the best~

Stay tuned for more fun activities.

~shiuanyih~

Annual General Meeting 2013/2014

A normal, simple but quite unorganised AGM. Perhaps the next executive committee member will improve it~

Meeting conducted by vice president which is Wei Hon. And there is some advice from teacher advisor, Pn. Chan. 

Election for next executive committee is done as well.

The new executive committee member

President: Chan Yee Zhe

Vice President: Ma Xin Wei

Secretary: Chong Siew Ying

Assistant Secretary: Manda Wong

Treasurer: Lai Pin Siew

Assistant Treasurer: Tan Poh Shyn

Representatives:- 

Kensett: Chong Pooi Seong

Clancy: Phavika

Mori: Shojin

All the best to the new exco~ Hope you guys can handle it well ;)

Apologies for all wrong doings or anything that make anyone unhappy.

My last post, Shiuan Yih

1st August 2013

Chemical Garden~

Chemical garden~ What is that? Any idea? 

Is it like this?

Keep reading to find out...

Since its a chemical garden, then we should use chemicals...

Chemicals needed:

1. Sodium silicate

2. Magnesium Sulphate

3. Copper (II) Sulphate

4. Copper (II) Nitrate

5. Nickel (II) Chloride

6. Cobalt Chloride

7. Iron (II) Chloride

After preparing those chemical. lets get started...

Add sodium silicate and distilled water into a beaker in the ratio of 1:2. Stir the mixture well. Leave it settle down for a few minutes.

Now, its time to add those chemicals in one by one~

Products of chemical that added in~ Look like a garden right?

After seeing the product, lets have some photos.

No electricity when the meeting going to end~ But meeting still go on :)

Lets listen to some explanation:

When metal salts are added to a silicate solution, insoluble silicates are formed. A semi permeable membrane forms around the salt. Because the concentration is greater inside the membrane, wter enters the membrane to dilute the concentration solution (osmosis). Osmosis causes the membrane to break. It breaks upward because the pressure of water on the sides of the crystal is greater than that on the top. This process is repeated as a new membrane forms, and an upward growth results.

Metals are mostly from d-block of periodic table (transition metal) since it is coloured.

Reaction taking place is a precipitation of the metal ions with silicate ions. A simplified equation for the reaction taking place with cobalt (II) ions from the metal salt and silicate ions from the sodium silicate solution is as follows: 

Co2+ (aq)   +   SiO3 2- (aq)   --->   CoSiO3 (s)

The cobalt silicate is a semi permeable membrane. Because the ironic strength of the cobalt solution inside the membrane is higher than the sodium silicate solution which forms the bulk of the tank contents, osmotic effects will increase the pressure witin the membrane. This will cause the membrane to tear, forming a hole. The cobalt cations will react with the silicate anions at this tear, forming a new solid. In this way, growths will form in the tanks, these will be coloured and may look like plants. The crystals formed from this experiment will grow upwards, since the pressure at the bottom of the tank is higher than the pressure closer to the top of the tank. Therefore, forcing the crystal to grow upwards.

Last meetings for upper sixes before AGM~ 

Shiuan Yih.

25/7/2013 

Quiz Time!

So many weeks of experiments and now, lets have some time for us to move our brain ~  Its basically about science, maths, IQ and some general knowledge questions. 

Ohh ya, there is a few lower sixes start joining us already~ WELCOME!!! You will not regret as you choose to join this club~

 serious answering~

Discussion session~

11/7/2013

Shiuan Yih.

Water that line up and CAN CRUSHING~

Water Line Up?

Try this~

Water travelling following the thread~

Go get two cups and try it out!

You see, members also tried. So what are you waiting for? Go and have a try! By the way, they like making 'teh tarik'. Right? XD

Can crushing!

This is another easy experiment~ 

First of all, get a aluminium tin which is uncrashed.

Fill it with a little of water just to cover the base of the can.

Heat the can filled with water until it boils. 

Placed it invetedly into a basin that is full of water and see how it CRASHED! 

Lets have a look on how the members mess it up

28.2.2013

ShiuanYih.