To measure alcohol molecules, a suspect breathes into the device. The breath sample is bubbled in one vial through a mixture of sulfuric acid, potassium dichromate, silver nitrate and water. Chemical Reactions The principle of the measurement is based on the following chemical reaction: The sulfur...
According to the present invention, it is a method for measuring the amount of a molecule taken up into a cell, based on (i) a step of adding and incubating the molecule to a cell population derived from an organ, and (ii) the expression level of CD31 and CD45. Including a step of...
When the two ingredients are combined, the sodium tetraborate causes the polyvinyl acetate molecules in the glue to stick together and create one big putty-like polymer (a process called cross-linking). Sure, you can purchase ready-made slime in a can, but where's the fun in that? We've...
In this article, we'll see exactly what fire extinguishers do and how they do it. We'll also find out what causes fire in the first place, learn how to use a fire extinguisher and see what sort of fire suppressant works best on different types of fires. Contents How Fires...
Why? Cold temperatures cause the air molecules inside the tire to lose energy, resulting in reduced pressure. For every 10°F drop in temperature, tire pressure typically decreases about 1-2 pounds per square inch (psi) — meaning the amount of air inside the tire. So how are your tires?
HOW DO YOU MAKE SLIME? We always like to include a bit of homemade slime science around here, and that’s perfect for exploring chemistry with a fun Hanukkah theme. Slime is an excellent chemistry demonstration and kids love it too! Mixtures, substances, polymers, cross-linking, states of ...
Thanks to our old friend wave-particle duality, electrons (which we normally think of as particles) can behave like waves (just as waves of light can behave like particles). The faster they travel, the smaller the waves they form and the more detailed the images they show up. Having ...
1 cup measure and 1 tsp measure Food coloring (optional) Instructions: STEP 1. Add the Metamucil and water to a saucepan and mix together STEP 2. Add a few drops of red food coloring to make the slime look like blood. Otherwise your Metamucil slime will have an orange hue. ...
On the next page, we'll learn about how nerves communicate with each other. Synaptic Transmission Like wires in your home's electrical system, nerve cells make connections with one another in circuits called neural pathways. Unlike wires in your home, nerve cells do not touch, but come clos...
You don't normally think of air as a sticky substance, of course, but as air moves over an object, its molecules strike its surface and cling to it, if only for an instant. This creates a boundary layer, a layer of air next to the object that affects airflow, just as the object ...