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How To: Make sodium bromate & potassium meta-periodate

This video tutorial is in the Education category which will show you how to make sodium bromate and potassium meta-periodate. This experiment uses toxic chemicals and releases harmful gases. First you have to make a saturated sodium bromide. To this solution then add a small amount of potassium dichromate. The solution now becomes concentrated. Then make the circuit as shown in the video. You need a 3 - 5 ohm resistor in order to reduce the current. Then let the cell run for around 6 hours. S...

How To: Use ninhydrin to reveal latent prints on paper

In this tutorial, we learn how to use ninhydrin to reveal latent prints on paper. This will work out because you will be spraying a special liquid onto the porous area. After this, you will turn on a black light and then be able to see the fingerprints appear in purple! Be careful with the solution, because it's flammable! This will also stain your skin, so make sure you wear gloves and don't let it contact a surface you don't want stained. To mix the solution, you will combine both of the so...

How To: Improve the Google page ranking of an image-based website

Google is the biggest and best search engine on Earth, and if you are a webmaster and want your website to be a big success it would really behoove you to know as much about how it works as possible. The Google Webmasters series of videos and website were created to teach webmasters, SEO professionals, and others how Google works by answering their questions and giving them insights into how they can best integrate and utilize Google's functionality to improve their business. This video will ...

How To: Clean your coffee maker

Maria Cleaveland shows us how to clean a coffee maker in this tutorial. It's important to clean out your coffee maker because calcium and lime can build up throughout regular use. One option is to use a cleaner liquid that you brew just like coffee, but is cleaning solution. You will then run two water coffees after this to make sure all the solution is out. Vinegar and water also work to clean out the coffee maker in case you don't have the cleaning solution. If you do this regularly, your c...

How To: Solve systems of linear equations by graphing

In this video the instructor shows how to solve systems of linear equation by graphing. A system of linear equation is equations of two lines that are to be graphed on the same coordinate axes. Now take the first equation and write it to form y = mx + b. Now extract the value of slope m and graph the line as shown in the video. Similarly graph the equation of the second line as shown in the video. Now if the two lines intersect at a point, that point is the solution to the system of that line...

How To: Describe a linear system without graphing

This tutorial looks at how to describe a linear system without actually graphing it. In order to do that, you will need to convert both equations of a problem into the Y=mx+b format. Once you have done this, you will be analyzing the m and b values. There are a few rules to follow. If the slopes (or m) and the Y intercepts (or b) are equal, there are an infinite number of solutions (or dependent equations). A second rule is if the slopes are equal and the Y intercepts are different, then the ...

How To: Solve a rational equation with no solution

This is a very interesting mathematical instructional video on how to find rational equation with no solution. How to solve the equation and check the answer. Let us take the example m over m-3 minus 4 is equal to 3 over m-3. In this equation we get m-4m+12 over m-3 is equal to 3 over m-3. When we simplify it further we get -3m +12 = 3. Or -3m = -9 and m = 3. This video teaches you very clearly how to solve a rational equation with no solution.

How To: Use vinegar & hydrogen peroxide to reveal fingerprints

Learn how to find latent finger prints on brass surfaces, such as fired cartridge cases. Called the Acidified Peroxide method, using only white distilled vinegar and hydrogen peroxide that you can find at your local drugstore, you can uncover fingerprints that is usually impossible to see using other methods. After mixing the vinegar and hydrogen peroxide the solution should start turning a greenish color around the brass object after 5 to 10 minutes. After you see the green color throw away ...

How To: Solve a system of equations via the elimination method

Elimination in mathematics is used to find the solution set of a system of equalities. This video tutorial shows how to use elimination to find the solution set of a given equation and offers several examples to illustrate the process. Before applying this method, the equation must be in the form “Ax +By=C.” When graphing a set of mathematical equations that intersect, the answer to the elimination is the point on the graph where the two lines cross.

How To: Fix missing desktop icons & missing start or task bar

Many times, the task bar and some of the desktop icons on your computer disappear. This being a common PC problem, the fun video has shown three different ways of solving the problem. The presenter has done a good job by enlarging the key images at most critical points in the presentation. He has also provided more than one way, in fact three ways of solving the problem. There are multiple solutions available with Windows but a very few presenters offer more than one solution. Each proposed s...

How To: Sell your stuff on eBay

Turn your possessions into cash and become an online selling machine. You will need: Something to sell, a computer with internet access, an eBay account, a digital camera, shipping supplies, something to sell,a computer with internet access, an eBay account, a digital camera, & shipping supplies.

How To: Use Your iPhone to Sell Unwanted Gadgets Without Ever Leaving Your Home

If you want to sell all of the old electronics lying around your home, it takes a lot of work. If you go the eBay route, you have to take tons of pictures, describe it accurately, wait for a week until someone bids on it (or not), then package it, ship it, and wait for feedback. Craigslist is a little bit easier, but usually requires you driving somewhere to meet the buyer in a public place (if you want to play it safe).

How To: Spot a Fake Samsung Galaxy S III Smartphone

If you watched the presidential debate last night, then you might recall Mitt Romney's remark on the fake Apple Store in China "selling counterfeit goods". That store actually sells real Apple products, only it isn't licensed to sell them, so it was a little misleading. Not to say that there aren't real counterfeit iPhones on the market in China. There are and for the most part, people know how to spot them; they mainly buy them because they are cheaper.

How To: Planning on Buying an iPhone 5? Here's How to Get the Most Money for Your Old iPhone 4 or 4S

Apple is notoriously cryptic when it comes to the reveals of its new products, and as usual, they've kept us guessing about the release of the iPhone 5 (or "New iPhone?"). It's expected to be officially revealed on September 12, and rumor has it that sales will begin on the 21st. Though the whole world seems to be anxiously awaiting the announcement, there has also been some controversy surrounding the iPhone 5's production. With the high number of suicides and poor working conditions at Foxc...

How To: Spend Less on Textbooks This Semester, More on Dorm Room Pranks

It's already August, which means school will be back in just a few short weeks. If you're getting ready to start or go back to college, that means you'll probably be dropping a few hundred bucks on textbooks. Here are some of the best places online to buy, sell and rent textbooks so that you can get back to more important things, like making your papers look longer than they really are and getting around your school's website blockers. Plus you can spend your money on more exciting things, li...

How To: Create a sexy brown and gold cat eye with Urban Decay NAKED

Urban Decay has a nasty habit of releasing highly anticipated makeup palettes in very limited quantities so they sell like hotcakes. Their most recent palette, NAKED, sold out in seconds on their website, but if you were one of the lucky ones to snatch one of these up, then this tutorial will teach you how to create a smokin' hot look using the palette.

How To: Sell your car on Craigslist

This six minute video shows you how to sell your car on craigslist. First, go to craigslist.com and click on the nearest city (or country). Follow the links to list an ad for a car for sale. You will want to put the kind of car in the posting title because that is used in sorting search results. In the posting description it is important to be as specific as possible - again describing the car, giving some history of the car like if it has ever been in an accident and if you have had any work...

How To: Clean a penny using vinegar and salt

In this video, Do It Your Self Central demonstrates to viewers how to clean a dirty penny by using common household products, namely vinegar and iodized salt. He suggests to put 1/2 cup vinegar and 2 teaspoons of iodized salt into a cup. This solution will be used to clean the penny. He demonstrates the power of the solution by holding the penny into the mixture for a few seconds. After only a short time, he shows the dramatic change between the portion that was dipped in the solution and the...