Hot Education Posts
How To: Add to fractions with uncommon denominators.
Wondering how to add fractions with uncommon denominators?
How To: Find the horizontal asymptotes of rational functions
Finding horizontal asymptotes is very easy! Not all rational functions have horizontal asymptotes. the function must satisfy one of two conditions dependent upon the degree (highest exponent) of the numerator and denominator. If the degree of the numerator is equal to the degree of the denominator, then the horizontal asymptote is y= the ratio of the leading coefficients. If the degree of the denominator is greater than the degree of the numerator then y= 0. If the degree of the denominator i...
How To: Use a sodium potassium pump
This is a great video presentation of how Sodium Potassium Pump can maintain a voltage gradient across a cell. It also discusses various things like the differences between positive and negative charges and positive and less positive charges etc. The video tries to explain a lot of things happen within a cell when you fluctuate the voltage of sodium as well as positive and negative ions within a cell. You must watch it yourself to see the changes happen within a cell when you make some changes.
How To: Find a slope of a straight line with: Ax + By + C = 0
In this video the instructor shows how to find the slope of an equation which is in the form Ax + By + C = 0. He says that the formula to find the slope of a line in the above form is slope m = -A/B, where A and B are the numeric constants of the variables x and y in the given equation. He goes on and further shows how to do this with a couple of examples. He shows how to reduce any equation into the general form and how to apply the slope formula then. This video shows how to find the slope ...
How To: Write a slope-intercept equation given an X-Y table
In this tutorial the author shows how to derive a slope-intercept equation of a line given an X-Y table. He explains that the general form of slope intercept form which is y = m*x + b. Now he intends to find value of slope, i.e. m first. Now slope is change in y over change in x. He computes the slope using the X-Y values from the table. Next he substitutes a pair of x, y value in the equation to compute the value of y intercept b. Now finally substituting the values in the equation the slop-...
How To: Identify characteristics of a sample during a survey
To identify characteristics of a sample in your survey, there are many factors to consider of your samples. The first four characteristics you need to focus on are gender, age, income level, and education level. All four of these characteristics must be proportional to that of the population. You also need to consider the geographic location. Only take samples from the immediate geographical area. Finally, an important characteristic of the survey is the sample size. You do not want to ask to...
How To: Make sodium acetate ("hot ice") in your kitchen
The Mr.G Show presents how to make "hot ice" more commonly known as sodium acetate in the kitchen. You start with one liter of white vinegar which you place into a sauce pan. You add four table spoons of baking soda to the pan being very careful because both chemical together will react an may cause a big mess so be prepared to clean up any boil over that may arise. Wait while this mixture boils down for the real fun to starts. The hot ice created will transform from a liquid to a solid befor...
How To: Evaluate exponents
Exponents are the times you multiply a number by itself. So 3 to the third power would equal 27. Another example could be 3 to the second would be 9. Any number with an exponent is always multiplied by the same number depending on the power. So this means that 5 to the third power would be 5x5x5, which would equal 125. One thing to remember is that when any number is multiplied by the power of 0, the number always is one.
How To: Find an angle when there are pairs of parallel lines
Consider two pairs of parallel lines, one pair horizontally and another is inclined from vertical position. If one of the four angles is given, then the other three angles can be easily identified. First select the angle which is down to the known angle, it will be same as first one. Then according to the law, that a straight lines consists of 180 degrees. For example if the known angle is 114 degrees, the unknown angle will be 180-114= 56 degrees.
How To: Subtract mixed numbers with borrowing
This video teaches you to subtract mixed numbers with borrowing. Consider 2 mixed numbers. For example 8 and 2/7 and the other 5 and 4/5.You have to subtract 5 and 4/5 from 8 and 2/7. First you have to convert the fractions to their common denominator. To equate the denominators of these two fractions you have to multiply the first denominator with the numerator and the denominator of the second fraction and also multiply the numerator and denominator of the first fraction with the denominato...
How To: Draw a circle with a compass for Geometry
The first thing you have to do is draw a line of the same length as the radius of the circle you want to draw. Then, open the compass the same size as the line length you draw is. Rotate the compass and you will create a circle. Please note that drawing this on a single sheet of paper can be difficult because the paper can move. Also, you can try rotating the paper, instead of the compass.
How To: Do long division
For anyone who has ever struggled with long division, this video offers some tips on how to perform this seemingly daunting task with relative ease. The example provided in this video is a very useful one and by following the steps of this video, you will be able to do long division easily. Starting from the right side of the number which is being divided, add 0's as place holders until you arrive at a number which can be divided by the number you want to divide by. Perform this one simple di...
How To: Find the surface area of a cylinder easily
In this video tutorial the author shows how to find the surface area of a cylinder. He shows a four step approach to solve this problem. First he gives us a formula to find the surface area of a cylinder, where Surface area A = 2 * Pi * R * R + 2 * Pi * R * H, where R is the radius of the base of the cylinder and H is the height of the cylinder. Now he identifies those values and substitutes them in the formula giving the surface area of the cylinder. This video shows how to compute the surfa...
How To: Create a crazy ketchup packet water bottle experiment
This video displays a very interesting experiment or magic trick involving the concepts of density and buoyancy. You will need an empty plastic bottle with its label removed, some water, and a ketchup packet. Using the concepts of pressure and density, this video demonstrates an interesting experiment which can also double as an interesting party trick; by squeezing a full water bottle, you can cause the ketchup packet to rise and sink in the bottle at your whim. This video is an interesting ...
How To: Convert between diameter and radius
To convert between diameter and radius just follow a few steps. Sometimes we aren't given the number directly so first we need to find the diameter.
How To: Make a homemade hot air balloon
Think a hot air balloon is something you can only read about in books? Think again. In this six-part science based tutorial, learn how to make your very own hot air balloon using science & the following easy to find materials: plastic bags, plastic drinking straws, thin candles, aluminun foil, tape, and scissors.
How To: End a letter
Not sure how to close an important letter? Convey a powerful meaning to readers by choosing the right sign-off. In this video, proper etiquette to close a letter is gone over.
How To: Calculate percentage
Not sure exactly how to calculate a twenty percent tip for your waitress? Or how about how to figure out how much less your cost will be with that thirty percent off tag? Use these steps to calculate percentage, without a calculator.
How To: Make iodine from hydrochloric acid and H2O2
Watch this science video tutorial from Nurd Rage on how to make iodine from an alkali metal iodide, hydrochloric acid (HCI), and hydroxide peroxide (H2O2).
How To: Make silver chloride for a photochemistry test
Watch this science video tutorial from Nurd Rage on how to make silver chloride for a photochemistry test. They show the chemistry of photography using silver chloride that they make themselves from table salt and silver nitrate.
How To: Make glass mirrors with silver nitrate
Watch this science video tutorial from Nurd Rage on how to make a mirror silvering solution from silver nitrate, ammonia, sugar, and sodium hydroxide.
How To: Perform Separation by Decantation in the Chemistry Lab
Find out how everything in a chemistry lab works, from pipettes to burners to recrystallization to storage. You'll get precise instructions on how to work and perform certain scientific duties in the chem lab, whether it's chemical or just ordinary high school science.
News: Light Fires with Toothpaste
The WonderHowTo Awards winners are in. The votes have been tallied. Despite all of these devastating wild fires, pyromania thrives!!
How To: Carry out a titration in the lab
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...
How To: Use the Unicam UV-visible spectrometer in the lab
The Department of Biological Sciences at the University of Alberta brings you this video tutorial specifically relevant to your student laboratory courses, specifically microbiology. If you're a student at any school of biology, this information will be helpful for learning how to use the Unicam UV-visible spectrometer, split beam and internal printer in the lab.
How To: Solve problems related to factors, multiples, & primes
Check out this instructional math video that reviews Elementary Number Theory, which is a fancy way of saying these are problems related to factors, multiples, prime numbers and remainders. In the 12th lesson, learn how to solve SAT math problems. Here are the math problems and their page numbers that this video covers:
How To: Perform the Barus effect
Watch this instructional science video to observe the Barus effect in action. A dyed solution of POLYOX (polyethylene oxide - it is the stuff used as the lubricant on the strip found in all modern razors) is extruded from a 50 mL syringe. On exit, a marked swelling in the liquid stream several times the diameter of the orifice is observed. The effect is referred to as the Barus Effect, but it also goes by several other names including the Merrington Effect, Die Swell, and Extrudate Swell.
How To: Conduct a magic floating boat science experiment
Check out this video tutorial to see how to conduct a magic floating boat science experiment.
How To: Dissect a female pig reproductive tract
Ever wondered about the reproductive tract of a female pig? Well, these video tutorials will tell you all you need to know about the anatomy of a sow's reproductive tract.
How To: Dissect a female reproductive tract of a mature hen
In this video tutorial two-parter, you'll see how to dissect the female reproductive tract of a mature laying hen for an anatomical look.
How To: Grasp the brachial plexus in humans
The brachial plexus is a collection of nerves that supply the upper limb. It has three functions; motor innervation of skeletal muscles, sensory innervation of skin and muscles, and sympathetic innervation of the skin, specifically the sweat glands, and blood vessels.
How To: Make hydrogen with vinegar and magnesium
Learn an easy way to make hydrogen with vinegar and maganesium. This experiment is dangerous, so please exercise caution.
How To: Make mothballs jump
If you put mothballs in a solution of vinegar and baking powder, the balls will collect air bubbles; then after they cause the balls to rise, the bubbles pop, and the mothballs drop.
How To: Make a ball of plasma in a microwave
There are about fifteen states of matter: solid, liquid, gas, plasma, et cetera. Plasma is commonly found in stars, and is a rare natural phenomenon here on Earth. In this video, I show you how to make artificial plasma in your microwave.
How To: Measure electrical resistance with a multimeter
This is a guided hands-on laboratory activity to help a student understand the proper and safe use of a multimeter to measure electrical resistance. These two video guides the student through the proper techniques for measuring resistance with a multimeter, but you'll need some assorted resistors, a rectifying diode, a photo cell, an electronic labs kit, and some other stuff.
How To: Subtract fractions and mixed numbers
See how to subtract fractions. Turn those mixed numbers into improper fractions to solve. Improve your math skills!
How To: Do this quick foot experiment to trick your brain
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:
How To: Make water rapidly crystallize
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 sodium
How To: Make solid rocket fuel ignition with zinc and sulfur
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.
How To: Make a Sugar Snake from Sulfuric Acid and Sugar
Sugar (a carbohydrate) is dehydrated with concentrated sulfuric acid. Since a carbohydrate was once considered just hydrated carbon, if you remove the water, carbon would be left over. The acid rips the water out of the sugar and the heat generated by this reaction causes the water to turn to steam. A black mass of carbon is produced.