In this permutation and combination math tutorial, we will learn how to find the number of possible arrangements in a set of objects. So, if you need help with your algebra or geometry homework, watch this.
Here, you'll see how to properly teach children some vocabulary words by use of a scaffolding method. You'll learn about modeling, prompting, monitoring understanding, coaching and much more.
It's time for a 'science is fun' video! Bar magnets put in a DVD case show how combined magnetic fields can be used to hold another magnetic object in place, even when it's an inch or so away from the actual magnet. You can even get mangnetic sand (iron, etc.) from the beach!
A science experiment you can do at home to gather a visible cluster of your own DNA. You need salt, dishwashing liquid, denatured alcohol, measuring tool, spoon, small glass/test tube/vodka glass, magnifying glass.
Learn how to make an ocean in a bottle. This video shows how to make a Cartesian diver. It is named after Rene Descartes, a famous French scientist, mathematician, and philosopher.
This week's experiment has made the rounds through the Internet as a strange trick, but there is science here too. We are going to use the science of complex systems to confuse your body. To try this, you will need:
In this video watch a simple experiment of lighting a bulb and a fluorescent tube. Makes you wonder if being so close to power lines radiates people. Hmmmmmmm
Video showing the construction of a typical spark-gap type Tesla Coil. There was a lot of information and I couldn't cover everything in this video. So there will be more in a part 2a and 2b.
Whether you're bored out of your mind or a budding scientist, this is one cool experiment to do at home. This science tutorial teaches you how to bend fiber optic light in water using a 532 nm, 50 mW laser.
Here are various tricks which are possible with "scratch holography." To make one of these holograms, all you really need is a plastic CD case and a couple of thumb tacks pushed through a stick.
A science experiment for all ages. Keep the kids busy over the holiday. This demonstration will entertain them for hours. You can have fun making one for each of the kids in your family. All you need is a penny and a bottle.
Another of my Halloween demonstrations. This simple but amazing video explains how everyday bubbles can float on a magic layer of air. It all has to do with density of air and some dry ice.
Elephant toothpaste is the name given to the catalyzed decomposition reaction of 30% hydrogen peroxide that uses soap to collect the oxgen gas that is produced. It is a favorite of most students at chemistry shows.
A seed crystal is dropped into an unstable supersaturated solution of sodium acetate NaC2H3O2 and it completely crystallized in front of your eyes. This demonstration is prepared by heating 700 grams of sodiumacetate in 50mL of water in a flask until all the solid dissolves. The solution is then cooled back to room temperature. Drop a seed crystal and see the very cool results.
When you use lycopodium powder, it explodes into flames when it is exposed to fire then dust form in this experiment. Be careful don't accidentally set your house on fire.
The flame test is used to visually determine the identity of an unknown metal of an ionic salt based on the characteristic color the salt turns the flame of a bunsen burner.
Styrofoam is a polymer and when brought into contact with acetone the polymer breaks down into its monomers. This demonstration shows the process of depolymerization. It looks pretty cool.
This reaction is between metallic magnesium and carbon dioxide. Magnesium reacts with oxygen in the air to form magnesium oxide, but when the only source of oxygen is from CO2 the reaction becomes much more energetic. The products are white magnesium oxide and black carbon.
The trick in this how-to video works with any carbonated beverage (never use beer). Take your beverage and cool it down to a temperature around 20F or -7C. Either the freezer or outside if it is cold enough. When opened it will freeze instantly.The reason:This demonstrates the principle of freezing point depression. Pure water at 1 atm will freeze at 0C or 32F. When something is dissolved in it the freezing point drops to a lower temperature. This is why when roads are salted there are puddles...
The picture may look like a mushroom cloud, but it is actually a can filled with hydrogen exploding. The can is fired into the ceiling. This demonstration still needs a little improvement in the area of safety (but it looks really cool). The problem is the partial pressure of hydrogen drops as the gas escapes and is replaced with air. This causes the reaction to be an explosion instead of a flame. Hydrogen is a tempermental element like that.
When a quarter in pushed into dry ice, a strange thing happens. The quarter starts to quiver. It is a normal room temperature quarter. I did nothing to the quarter. This is not a trick but really happens. The evaporating CO2 creates a small air current causing the quarters to vibrate.
This can actually happen. It seems unnatural, but the laws of physics don't lie. Liquids require heat to boil, and if the conditions are right one liquid can be boiled in order to freeze a second. Under a vacuum, the water in an acetone/water mixture can freeze while the acetone boils. Watch the video and see for yourself.
Watch this video to learn how to make a penny operated nitric acid fountain. Nitric acid acts upon copper to yield nitric oxide in an exothermic reaction. The expanding gas displaces water from another flask; actually bubbles in this set up. When the gas cools, the water is drawn back into the flask, dissolving the nitric oxide and forming a blue solution with the copper ions still there. Very cool science experiment with a neat reaction.
Want to be an astrophotagrapher? Here is the simple facts of taking photos of those beautiful stars using your telescope and a camera. More advanced photographers tend to use a chilled camera though, so watch and learn.
Join Colin as he shows you how to lift an ice cube without touching it with your hands! Cool huh? All you need is water, salt, ice, and a match of course.
A difficult concept for many students to understand is the energy involved in breaking and forming bonds. A hydrate is a substance that has water bonded to it. In order to dehydrate you must add energy (endothermic) to break the bond to water. When hydrating you are forming a bond to water and will release energy (exothermic). This visual demonstration reinforces the concept.
This experiment is intended to introduce students to hydrated compounds. These compounds have water molecules coordinated in their chemical structures. Examples CuSO4*5H2O, BaCl2*2H2O, and NaC2H3O2*3H2O.
When was the last time you saw one of these? This classic children's toy seems very simple, but the chemistry involved is very interesting. Do you know how it works?
Once used as solid rocket fuel because the reaction requires no oxygen, sulfur and zinc react vigorously. The reaction with zinc produces flame and a near explosion. Sparks fly and smoke billows in this dramatic chemical demonstration.
Chlorine gas is bubbled up along with acetylene gas through a large graduated cylinder filled with water. Where the bubbles of the two collide, an instantaneous, bright flash of light occurs.
The term "Thermite" refers to the mixture of aluminum and ferric oxide used in this experiment. It is sold commercially and is used for such applications as railroad welding and incendiary bombs.
