In this video I go through the answers to the Medical option of the 2016 HSC exam. As well as clearly show you how o get maximum marks, I also highlight some important exam techniques to ensure success
The solution to Q24 in the HSC Physics examination 2015, dealing with electric plates
You’ve studied the Photoelectric Effect, and seen how it fundamentally changed our understanding of light. Now test your understanding with these questions
Answering a different sort of projectile motion question
How well do you know electromagnetic induction, Faraday’s Law and Lenz’ Law?
In this video I take you through a number of multiple choice questions to test your understanding of the basics of special relativity and its consequences
In the first of a weekly series, I go through a variety of multiple choice questions, in increasing difficulty that assess your understanding of projectile motion. I then go through the solution as well as showing why the other alternative responses are incorrect
Science Night The Explosion of Colors Experiment – This experiment is a lot of fun. How does it work? Milk has fat in it and the food coloring floats on top of the fat. The fat is all connected with bonds. When you add the dish soap to the milk, the fat separates and moves making the colors explode!
Totally Awesome to Watch!!! This is one of the most striking science demonstrations we have seen in a long time. Place an ice cube on each of these two identical looking black blocks at room temperature. One ice cube instantly begins to melt and is totally gone in about 120 seconds while the other ice cube shows no evidence of melting.
Colorful candies like Skittles are made with FD&C dyes, sugar and other substances. By adding hot water with the skittles it starts to release the dyes as you can see here with the experiment. Try different candies to see if you get the same results. Or start the candy in the middle of the plate to see what happens. Best part is you can still eat them.
How is this possible? With a little thing we scientists call SURFACE TENSION. Basically it means that there is a sort of skin on the surface of water where the water molecules hold on tight together. If the conditions are right, they can hold tight enough to support your paper clip. The paperclip is not truly floating, it is being held up by the surface tension. Many insects, such as water striders, use this “skin” to walk across the surface of a stream.
How Does It Work? Surface tension gives water some amazing properties. The cohesion and surface tension of water becomes apparent when the drops of water you add to the penny reach the penny’s edge. Once the water has reached the edge, you begin to see a bubble or dome of water forming on top of the penny as you can see here in the video. The bubble shape is a result of the water molecules clinging to one. I was able to get 30 drops on a penny. Let me know how many you were able to do?
First you Make two chemical solutions and mix them together. Wait a few seconds, then wow! It will suddenly change colors. This is the famous iodine clock reaction in an easy-to-use kit. Change the concentrations or temperature and change the delay for the color change. Adult supervision is Required.
The Tornado tube Connector is a plastic adapter fitted for two plastic soda bottles to be held together to create a vortex within one of the bottles. It works by flipping and then spinning the bottles in such a way that the water is now in the top bottle and the air begins to replace the water in the top bottle in a vortex shape.
See how soap breakdowns the surface tension of water.
Take the Aluminum boat buoyancy challenge. Start with a 4″ by 4″ piece of aluminum foil. Then use that piece to make a boat that will hold the most pennies as possible without sinking. See which designs hold the most. My niece Amber was able to hold 20 pennies. This challenge will make you explore how the size affects how much weight they carry and how this relates to the density of water. Try this with salt water to see if you can hold more pennies?
Why a pot of boiling water will not boil over when pasta is added if olive oil is added to the water beforehand? Water molecules are polar and they strongly attract one another at the surface of the water. This makes the surface harder to pierce or expand. Pure water doesn’t foam when it boils, because it’s hard to stretch the surface out to make bubbles. The scientist is called “surface tension”. Now drop some pasta in the pot. As it cooks, organic materials are released into the cooking water. Some of these organics materials have hydrocarbon parts that…
Your Magic Water Flower is powered by scientific phenomenon called Capillary action. Thanks to Capillary action, paper absorbs water very rapidly. When the paper gets wet, it swells which causes the folded petals of your Magic Water Flower to open up. So what does all this have to do with your Magic Water Flower? Paper is made of tiny wood fibres which are tightly interwoven providing amazing strength and a beautiful writing surface. Even in high quality paper, there are billions of tiny little gaps between the fibres. When paper comes into contact with water, the amazing power…