Videos uploaded by user “sciencefix”
Water Electrolysis
Two simple demonstrations of water electrolysis. The first demonstration was learned at the 2010 CSTA Conference at Tara Krisch's (Orange Grove Middle School) presentation on compounds.
Views: 412816 sciencefix
Watermelon Caviar
This is a recipe that is adapted from Earl Lee's watermelon caviar Recipe from Toastable.com (http://toastable.com/2010/08/watermelon-caviar-an-introduction-to-molecular-gastronomy/). It demonstrates a technique used in molecular gastronomy. A polymer, sodium alginate, is mixed in with watermelon juice. The mixture is then carefully inserted, with a syringe, into a solution of calcium chloride. A chemical reaction happens between the calcium chloride and sodium alginate to form calcium alginate. The calcium alginate is not soluble in water and thus forms a gel around the outside of the watermelon juice. The calcium alginate watermelon spheres are edible.
Views: 103591 sciencefix
7 Inertia Demos
This video shows 7 different inertia demos. Newton's 1st law of motion (law of inertia) states that objects at rest will remain at rest, and objects moving at constant velocity will remain moving at constant velocity unless acted upon by an outside unbalanced force. Some of these demos show the first part of the law and some demonstrate the second part of the law. Sciencefix.com producer: Darren Fix
Views: 278768 sciencefix
Polyurethane Foam
The video clip shows the production of polyurethane foam, a polymer, when two chemicals (monomers) react when mixed together. ScienceFix.com producer: Darren Fix
Views: 103999 sciencefix
Egg Inertia
Anything that has mass, has inertia. The broom applies an unbalanced force to the pie tin, causing the pie tin to accelerate. The rim of the pie tin applies an unbalanced force to the egg holder, causing it to accelerate. With no balanced force to counteract gravity, the egg falls into the tennis ball can of water.
Views: 17889 sciencefix
Flaming Money
A dollar bill is soaked in 2 parts water, 2 part isopropyl alcohol, and then lit. The liquid burns off, but the dollar bill doesn't ignite. Watch the video for an explanation.
Views: 12700 sciencefix
Magnesium Reacts with Oxygen
A short video that shows magnesium reacting with oxygen. A short explanation of how the reaction works follows the video.
Views: 150547 sciencefix
Iodine Bag Diffusion
A video that shows how diffusion occurs across a selectively permeable membrane.
Views: 39007 sciencefix
Flour Fireball
All purpose flour is spread out over several birthday candles. Since the flour particles are spread out, they have enough oxygen gas molecules to react with and hence the flour burns quickly.
Views: 8858 sciencefix
Alginate Polymer
A mixture of sodium alginate and cabbage juice is mixed with some calcium chloride to make calcium alginate gel.
Views: 15494 sciencefix
Colorful Water Electrolysis
In my class students learn about chemical reactions and also the difference between elements and compounds. Students learn that the 5 signs of a chemical reaction are: 1) color change 2) gas production 3) precipitation 4) temperature change 5) change in properties (smell, texture, taste, density, etc.) Students also learn that compounds are chemicals that have 2 or more elements bonded together, such as water. In this demonstration, students can observe the compound water undergo a chemical reaction, and break apart into hydrogen and oxygen gas. This demonstration can be done on an overhead projector so that all students can view it easily. ScienceFix.com Producer: Darren Fix
Views: 10374 sciencefix
Inertia Demos Revised
Five demonstrations show inertia in action. Inertia dictates that objects at rest will remain at rest, and objects moving at constant velocity will remain moving at constant velocity, unless and outside unbalanced forces is applied. ScienceFix.com Producer: Darren Fix
Views: 6856 sciencefix
Books Smash Eggs
How much compression force can an egg take? This video gives you somewhat of an idea.
Views: 7249 sciencefix
Disappearing Styrofoam Cup
A Styrofoam cup is placed in a Petri dish of acetone. The cup seems to have disappeared. How does that work? Watch the video for an explanation.
Views: 18220 sciencefix
Forces and Motion
Marbles are set in motion on a track. Various forces act on the marble causing a change in motion.
Views: 45087 sciencefix
Newton's 3rd Law
A simple demonstration of Newton's 3rd law of motion in action. A rubber band under tension is cut, launching both the sled and the launching mechanism in equal and opposite directions.
Views: 29588 sciencefix
Carbon Dioxide Phase Changes
A series of demos that show the sublimation of carbon dioxide gas.
Views: 5670 sciencefix
Sodium in Water
Sodium (Na) is a highly unstable alkali metal. It needs to give up one electron to become stable. When a cubic centimeter sized piece of sodium is placed into water, a vigorous chemical reaction occurs in which sodium hydroxide (NaOH) and hydrogen gas is produced. ScienceFix.com Producer: Darren Fix
Views: 522225 sciencefix
Condensation Balloon Trick
What happens when you place a water balloon over the opening of a flask of boiling water after the flask has been removed from a hot plate?
Views: 3458 sciencefix
Safety Demo: Why Do Students Need to Wear Safety Goggles?
It's that time of year where school is starting and that means teachers have to go over the safety rules in the science classroom. Teachers who teach chemistry must have all of their students wear safety goggles during lab activities. Being a teacher whose middle school students don't really want to wear them, I have a simple demo for students to understand the need to wear them.
Views: 9238 sciencefix
Refracting Jelly Marbles
Jelly marbles are shown in and out of water. Jelly marbles refract light in the same way as water. That is why they can't be seen in water. A laser is then sent through the jelly marbles and the refraction path is shown.
Views: 45970 sciencefix
Yeast Respiration
A demonstration of yeast cells going through cellular respiration.
Views: 31282 sciencefix
pGLO Transformation
Bio Rad's pGLO transformation kit is demonstrated in this video. The pGLO plasmid has 3 genes spliced into it. Bla is a gene that codes for a protein that nullifies the antibiotic ampicillin. Ara C is a gene that codes for a protein that turns on the GFP gene. The GFP gene codes for the green fluorescence protein (GFP), which glows green in the presence of UV light. The GFP is normally found in the jellyfish Aequorea victoria, which makes it bioluminescent. The pGLO plasmid is inserted into E. coli bacteria, which makes the bacteria survive in ampicillin and glow green in UV light. ScienceFix.com Producer: Darren Fix
Views: 19734 sciencefix
Expanding Soap
A short video on what happens when Ivory soap is put in the microwave. Watch to see and learn what happens.
Views: 1986 sciencefix
Soda Can Density Discrepancy
Eight different types of soda cans are placed into a tank of water and they either sink or float. There appears to be a reason for the results at first, but then 2 more cans of soda are tested and produce interesting results.
Views: 9734 sciencefix
Scenes From an Ant Farm
This video shows harvester ants in the AntWorks habitat. The habitat contains a blue gel the ants can tunnel through and also eat. The gel was developed for a space shuttle mission investigating ant behavior in microgravity. Regular ant habitats utilize soil for the ants to tunnels through and live. Unfortunately, soil tunnels would collapse with the violent shaking of a space shuttle lift off. Thus this gel was developed to withstand that. The AntWorks gel is illuminated from the bottom with four LED lights to give the appearance of a blue glow. The video clip shows the harvester ants using their jaws to make tunnels, and their antennae to communicate with each other. ScienceFix.com Producer: Darren Fix
Views: 15358 sciencefix
Phase Motion
The motion of particles of the phases of matter are demonstrated.
Views: 2475 sciencefix
Conservation of Matter: Heavy Whipping Cream
Two reactants, heavy whipping cream and vinegar, are mixed together to make products. The mass of the reactants are compared to the mass of the reactants.
Views: 37693 sciencefix
Hydrogen Egg Bomb
I decided to try out a demo that I saw Steve Spangler do. I've always wanted to ignite a balloon filled with 2 parts hydrogen gas and 1 part oxygen gas. It just wasn't much of an option in my classroom. The egg is much more practical. Hydrogen gas is produced by reacting zinc metal with hydrochloric acid. The hollowed out egg is filled with the gas and then ignited.
Views: 7390 sciencefix
Will Four Liquids Stack?
Can water, salt water, alcohol and shampoo be stacked in a test tube?
Views: 2117 sciencefix
Melting Rates
A simple demonstration shows how materials, with different heat conductivity, can affect the melting rate of water.
Views: 2928 sciencefix
Conservation of Mass
The conservation of mass is show in a chemical reaction between iron and oxygen in a closed environment.
Views: 45688 sciencefix
Floating & Sinking Mystery Part 2 Solution
The solution to the floating and sinking mystery.
Views: 696 sciencefix
Fire Hand
Methane gas bubbles are created. They are ignited on the surface of a person's hand. It is an exothermic reaction that is in the palm of your hand.
Views: 26599 sciencefix
Teachers Being Students: Doing Science-From Observations to Results
At the beginning of the school year I like to introduce my 8th graders to think like a scientist. I give students an Ob-Scertainer (http://www.flinnsci.com/store/Scripts/prodView.asp?idproduct=14896 ). It's a great way to discuss what observations, predictions, hypotheses and results are. It also leads to a good discussion of the significance of results. I want to thank the teachers that volunteered to be my "students" for this video.
Views: 2338 sciencefix
Chocolate Pop Rocks
I adapted this from "The Voltaggio Brothers Make Chocolate Pop Rocks Lollipops" (http://www.youtube.com/watch?v=K2dA1l9-ZQQ). It's another segment where the making of a fun food can be mixed in with some key concepts of science.
Views: 5423 sciencefix
Solar System Scale Model
Scale drawings of the solar system, both to size and distance, are never shown in science textbooks. This video answers why and shows one attempt of such a model.
Views: 7301 sciencefix
Safety Demo: The Importance of Hand Washing
It's the beginning of the school year and teachers need to go over safety rules. After a chemistry lab or a biology lab involving dissections it is important for students to wash hands to get rid of chemical residues or to prevent the spread of pathogens. The video demonstrates how pathogens and/or chemical residues can spread quite easily and how washing hands is important to prevent it. Glo Germ is the product used in this demonstration.
Views: 161115 sciencefix
Sodium Acetate Crystals
I made this video a few years ago and put it up on Blip.tv, but never on YouTube, until now. A supersaturated solution of sodium acetate forms crystals instantly.
Views: 2649 sciencefix
Activation Energy
The red phosphorus on the end of matches need activation energy to react with the oxygen in the air. The heat energy from the hot plate provide enough energy to activate the chemical reaction.
Views: 8219 sciencefix
A large lead fishing weight hangs from a wire that is attached to a ceiling. It is let go and it never reaches as high as the starting point. The video explains what happens.
Views: 1153 sciencefix
Balloon Suck
The reason the balloon gets pushed into the flask is due to the rapid cooling of the hot gases in the flask once the chemical reaction stops. The gases condense as a result, lowering the pressure inside the flask and the atmospheric pressure pushes the balloon into the flask.
Views: 10437 sciencefix
What Causes the Different Spinning Rates of a Radiometer?
My students often stare in wonder at the radiometer that sits in the window sil of my classroom. A lot of them think it's the temperature that causes the different spinning rates. Others think it's the amount of light. I decided to attempt to see which factor determines it.
Views: 13350 sciencefix
Using Magic as a Discrepant Event
Discrepant events are the cornerstone of a constructivist science education. A good demo will force a student to confront their preconceived notion of how a phenomena works. Students must work at trying to resolve the conflict between what they just saw and their prior knowledge. Magic tricks are a perfect example of that. Students think what they just saw is magic or they try to figure out how the magic trick works. This is a simple magic trick that involves the scientific concept of friction (and a little bit of tension).
Views: 5477 sciencefix
Does Mass Affect Whether an Object Floats or Sinks in Water?
There are 12 items of different densities. Will they sink or float based on their masses?
Views: 9430 sciencefix
Golf Ball vs. Lead Fishing Weight
What happens when a golf ball and lead fishing weight collide?
Views: 2764 sciencefix
What Causes the Phases of the Moon?
Students often have misconceptions about certain science concepts. They occur naturally and they do not happen because a student is not intelligent. The human brain tries to fit information in an easy to digest construct, even though it is not accurate. Misconceptions are very difficult to break. The best way for students to break their misconception is to articulate their understanding and then try confront a demo or new piece of information that contradicts that misconception. In the video some teachers are asked the question, "What causes the phases of the moon?" They then are asked to demonstrate their thinking and to explain how it works. An explanation and demonstration of how the phases of the moon actually happen takes place in the last third of the video.
Views: 15320 sciencefix
Hot and Cold Water
Two test tubes, one with cold water and one with hot water are lowered into a container of room temperature water. What will happen when the test tubes are opened?
Views: 2708 sciencefix
Lava Lamp
A while back I posted an item from Steve Spangler's Science site that demonstrated how to make lava lamps. I decided to go ahead and try it and I filmed it. The materials that are required for the demo are shown below. As the video shows the peanut butter jar is filled with 3/4 vegetable oil and 1/4 colored water. Place an 1/8 of an Alka-Seltzer tablet into the jar. The Alka-Seltzer reacts with the water to form carbon dioxide gas bubbles. The gas is less dense than the water or oil. The carbon dioxide gas bubble attach themselves to the colored water, causing them to rise to the surface. When the gas breaks through to the surface the higher density colored water droplets sink back down into the jar. The second part of the video shows the same demonstration, this time in a large test tube. ScienceFix.com producer: Darren Fix
Views: 1394 sciencefix
What is Causing Different Lava Lamp Activity?
I have two lava lamps in my classroom, yet they behave very differently. What are some factors that can cause that?
Views: 15265 sciencefix

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