In chemistry you come across problems which ask you to find the percent by mass and percent composition of each element in a chemical compound. To do this the first step is to compute the molar mass. Use the periodic table to look up the mass of individual atoms and multiply it by the number of atoms to find the mass of that element. Now add up all the masses to arrive at the molar mass of the compound. Now to find the percent composition of an element divide the total mass of each element by...
In this video, learn how to make a Pandora battery with the original PSP slim battery. To complete this tutorial, you will need your PSP, scissors, electrical tape, an Exacto knife, and a lead pencil with an eraser.
If you're doing any sort of electrical work at home, a multimeter is an invaluable tool to have. But as invaluable as it is to have a volt/ohm meter, it is obviously even more invaluable still to know how to use one. And, with this electrician's how-to, you'll learn how to do just that. For more information, and to get started using and reading multimeters yourself, watch this free video guide.
In this video from nmsuaces we get a lesson in how to dispose of leftover lawn chemicals. Many gardeners want to know what to do with leftover materials and how to get rid of it safely. You should not store it. Once mixed up, use it all. Make your mix so you don't have to have a surplus that day. If you have a surplus, you need to spray it in an area that is labeled to be used. After you are finished rinse the container at least 3 rinses. The rinse water must then be sprayed out in the area w...
Learn how to balance the three different types of chemical equations in simple steps. First take an equation, write down its reactants and products and write down the names of all elements. Now write down how many of each element are present in the equation. Now check which element does not match, in this case the Oxygen doesn't match. Now multiply the element or compound starting at two but now hydrogen doesn't match. Try to match them by multiplying the coefficients but now sulfur doesn't m...
This video is based on a chemistry experiment. This video is going to explain to us how to use gravimetric analysis in order to analyze sulfuric acid. This experiment should not be done for those who do not have a fundamental knowledge of chemical compounds, reactions and chemical safety. He explains first what he is about to do before he does it. Sulfuric acid is acidic and can be toxic if ingested or in contact with the eyes. Take extreme care with this experiment.
Learn how to make a cheap burglar alarm/trip wire alarm with step by step instructions. This is pretty basic but effective. Cardboard, fishing line, batteries, soldering wire, soldering iron, hot melt glue gun, an empty soft drink can, electrical tape, buzzer are some of the necessary equipment. Follow along and make your own burglar alarm and keep your house safe.
Ever wonder what happens to a penny when an electrical charge is applied to it? Well, you'll find out in this science lesson that shows you how to dissolve a penny with a power adapter.
Soldering isn't hard as you might think. This video will cover the basic soldering techniques for electronics and electrical wiring. It presents a comprehensive look at the soldering process, covering everything from choosing a soldering iron and solder to proper soldering technique. Get started soldering with this electronics how-to.
While one can achieve a number of realistic vintage keyboard sounds through sample libraries like the Reason Abbey Road Keyboards refill, there's no beating the genuine article. If you find a vintage keyboard, however, it may need any number of repairs to get it sounding like it should. In this how-to, you'll learn how to get rid of electrical hum in a Wurlitzer 200 Electric Piano. Take a look!
Faulty switches are easy to fix; you just have to exercise caution. You will need a screwdriver, a new switch, and a circuit tester. Electrical repairs don't need to be dangerous, just be careful. Watch this video home repair tutorial and learn how to replace a light switch.
Do you want to learn how to make your own, personal wrestling ring? Watch this video tutorial to learn how. You will need a trampoline, rope, small PVC pipes, electrical tape and steel metal poles.
Radar Roy demonstrates in this video tutorial how to hard wire a dash-mounted radar detector. The advantage of direct wiring your radar detector is getting rid of that wire mess going to your cigarette lighter. So, if you don't want another speeding ticket again, install your radar detector the right way, the direct way! All it takes is a little electrical know-how, and maybe a little automobile know-how.
Tim Carter, of Ask the Builder, demonstrates the installation of an outlet box and how to easily wire the switch box in your home. With a little help from some pliers and wire strippers, this DIY project will be a breeze.
Tim Carter, of Ask the Builder, demonstrates how to wire up a 3-way switch in your house, into an electrical circuit, for your lighting needs.
Ask the Builder host, Tim Carter, demonstrates how to wire up a 4-way switch, and where to place a 4-way switch in an electrical circuit in your home.
This will demonstrate how to build a hidden compartment / diversion safe out of an electric outlet.
This video shows you step-by-step, how to make barbed wire for a Warhammer mini-gaming system. All you need is electrical wire (insulated or not, it doesn't matter), some paper clips, and your applicable tools for cutting.
Every wall switch and outlet on an outside wall is a hole in your wall. Here's how to insulate them while conserving energy and being eco-friendly.
Would you know what to do if someone ingested poison? Equally important, would you know what not to do?
Zika is a threat to unborn babies — the virus can cause neurological damage if it infects a mother during pregnancy. But as with many things, our solutions to the problem aren't always all that much better than the problem itself.
A rose by any other name may smell as sweet, but one annoying invasive weed may hold the answer to treating the superbug MRSA. Researchers from Emory University have found that the red berries of the Brazilian peppertree contain a compound that turns off a gene vital to the drug-resistance process.
If you look at the label on your favorite processed snack, there's a good chance you have no idea what half the ingredients are. It's nothing new, but with natural and organic foods becoming huge trends, we're hyper-aware of all the "chemicals" we eat.
Glow sticks, a popular favor at parties and outdoor events, and a must-have on Halloween, can be traced back to the United States Navy in the mid-1960s. The military desired improved visibility during night operations, and glow sticks, with their small-size portability and lack of batteries, were a perfect tactical solution.
The Interactive Lab Primer (ILP) has been developed as part of the Royal Society of Chemistry Teacher Fellowship Scheme, one of the themes of the Chemistry for Our Future program, and initiative which aims to secure a strong and sustainable future for the chemical sciences in higher education. The aim of the ILP is to address the diverse range of experience and skills students bring with them to a university by offering a resource to support their transition from school to the university chem...
If you're trying to be a pacifist or a good soul in Deus Ex: Human Revolution, check out this guide on how to save Malik without killing anyone. It will really help if you have the Cloak 3 augmentation for the added chemical resistance.
Make a flexible aluminum electroluminescent display using aluminum foil, EL phosphors and a simple electrolytic etching bath. This video shows the chemical process behind etching foil in an electrolytic bath, and develops it into a practical application for it by creating an electroluminescent caution display.
In this tutorial, learn all about the difference between breads at supposedly healthy sandwich shop, Subway. Did you know that the new 9 grain bread actually has the same nutritional value as the plain white bread they offer? Find out what scary chemicals are hiding inside your lunch with this clip from Food Facts TV.
Do you feed your kids the yellow box lunch? Sure, it's easier than making a sandwich from scratch - but what's easy is usually not healthy. Check out this clip and learn all about the dangers lurking inside the iconic yellow box. Lunchables are full of chemicals, fats, sodium and calories.. watch this Food Facts clip and keep your family healthy.
A lot of commonly used household items are actually poison for your furry friends. In this clip, learn all about which items can pose a danger for your dog or cat. It's not only chemicals that are bad for your pets, innocent seeming items like fruit, veggies, chicken bones, chocolate, human medications and many other hidden dangers exist as well.
See how to make a simple laser communicator with KipKay and MAKE Magazine! Find out how to secretly shoot your voice across the room in stealth mode on the beam of a laser! Kipkay loves his lasers! A simple laser communication device is the perfect way to talk across the room.
Can you recharge non-rechargeable alkaline batteries? Yes you can! Gary Cutlack from techdigest.tv risks chemical burns to demonstrate.
No, we're not lying. But before you try and tear a plain old penny in half, you should probably watch this video first or you may hurt your fingers. While ordinary pennies are very, very difficult to rip, if you get rid of the zinc core you are left with only the thin copper shell, which is itself very easy to tear apart.
Wired Science teaches you the science behind glow sticks by showing you how you can make your own with chemicals that you can obtain.
You've seen them at Disneyland's Fantasia. And in big budget movies like "Waterworld" and "Lord of the Rings." Spectacular, glowing fire effects that seem to ripple with the wind are a staple of action movies, and though it may seem like you need a super good video editing team to create such light shows, all you really need is some household chemicals.
With a pair of new APIs and low-latency media servers, Twilio's Programmable Video platform could soon help ARKit and ARCore app developers build shared AR experiences between multiple users.
Due to the overnight success of smartphones, millions of people are connecting with others. Currently, over 15 million text messages are sent every minute worldwide. Most of this communication is happening in the open where any hacker can intercept and share in the discussion unbeknownst to the participants. However, we don't need to communicate insecurely.
Some people are of extremely secretive nature. They do not like sharing their personal events in their lives with anyone. Thus people around that person wont be able to figure out details on their life's personal matters. It is not like they want to hide some mysterious secrets from the world, but it is just their nature that they do not want others to know much about them or are too shy to share their feelings with others. Being secretive is neither good nor bad, it is just how they are.
There's no charge for this electricity! All you'll need for this project is... Now, watch and learn how to make your own emergency power if you find yourself in a bind.
While at work, you notice your gloves changing color, and you know immediately that you've come in contact with dangerous chemicals. Bandages on a patient signal the presence of unseen, drug-resistant microbes. These are ideas that might have once seemed futuristic but are becoming a reality as researchers move forward with technology to use living bacteria in cloth to detect pathogens, pollutants, and particulates that endanger our lives.
