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PHYSICS - Astrophysics - The Big Bang
The Big Bang theory states that the Universe ‘began’ with a colossal explosion about 13,700 million years ago and has been expanding ever since. Here are two pieces of evidence for the Big Bang. Cosmic Microwave Background Radiation and...
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Reducing Particulates (Soot)
Learn about reducing particulates as part of the carbon chemistry within environmental chemistry.
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Insulin and Glucagon
In this lesson, you will learn about how your blood glucose level is regulated (or controlled) by two important hormones – insulin and glucagon, via a negative feedback system. When you consume a meal that is high in carbohydrates, such...
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Solving Quadratics By Factorising
Quadratics using have an x-squared, an x term and a number on it’s own (known as a constant). There are a few different ways to solve quadratics: factorising, using the quadratic formula or by completing the square. In this video we look...
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Collision Theory & Reactions - Part 2
In Part 2, learn the basics about Collision Theory and Reactions. Different reactions can happen at different rates. What is a collision theory and how does it relate to reactions? Find out more in this video!
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Polymerisation of Ethene
Learn the basics about the polymerisation of ethene as a part of organic chemistry.
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Arithmetic (Linear) Sequences
In this video we are going to look at arithmetic sequences in more detail. These are also known as linear sequences. We will discover how to find the nth term rule, which we will then use to find any term in the sequence. Before we...
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MATHS - Trigonometry -Pythagoras
Thousands of years ago it was discovered that the two smaller squares on the side of a right angle triangle added up to the exact same size as the larger square on the triangle - the square formed on the diagonal side. This is called...
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How Has The Atmosphere Changed
Learn the basics about the changes to our atmosphere, as a part of environmental chemistry. The Earth’s early atmosphere had no oxygen. By examining rocks laid down over earth history we can piece together the story of our atmosphere, to...
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Reciprocal Graphs
Reciprocal functions are actually extremely important. Isaac Newton deduced that the forces needed to hold planets in orbits is a reciprocal relationship with the squares of their distances. Radioactive isotopes decay reciprocally, and...
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PHYSICS - Radiation - Emitting Radiation
What do you think of when you hear the phrase “emitting radiation”? Do you think it’s a good thing or a bad thing? What if I told you it was vital for life on Earth?
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How Enzymes Denature
Enzymes have optimal conditions under which they operate. Temperature, pH, enzyme concentration and substrate concentration are some conditions that affect the rate of reaction. As enzymes are proteins, they have an optimum temperature...
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Negative Feedback
Negative feedback sounds like a bad thing, right? Well actually it’s not bad at all. In fact it’s a very important process that occurs in our bodies all the time. But what does it actually do? What does negative feedback mean?
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Calculator Trick - Table of Values
Use this quick calculator trick to help you generate the table of values, giving you the coordinates to plot onto a graph. Your calculator saves you time, and means you will not make mistakes substituting in values into the equation.
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What Makes Things Alkali?
Learn the basics about What makes things alkali? How is alkali recognized? What are alkali chemical properties? Find out more in this video!
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Polymers Of Chloroethene & Propene
Learn how to draw out the formula of poly-chloroethene and poly-propene and learn about some of their uses in real life.
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BIOLOGY - Environment - Carbon Footprints
You can reduce your own contribution to climate change by reducing the amount of carbon dioxide you release into the atmosphere. Your carbon footprint is measured by the amount of extra carbon dioxide your lifestyle adds to the...
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Indicators
Learn the basics about Indicators, more specifically for acid and bases. An indicator is a large organic molecule that works somewhat like a " color dye". Find out more in this video!
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BIOLOGY - Environment - Human impact
In this video we'll learn about how human activity has a negative impact on the Earth because of burning fossil fuels, deforestation and creating waste.
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MATHS - Graphs - Velocity-Time Graphs
Here we are going to look at Velocity-time graphs. These are graphs which look at the change of velocity over time. It may be useful for you to look at our video on distance-time graphs before starting this video.
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Frequency Tables
In this video, we’re going to look at frequency tables.These numbers are enough to give someone a headache and there's only 200 of them. `Lot's of datasets have thousands of even millions of pieces of data so, we need to collect and...
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Formation of New Species by Speciation
In this video you will learn how weird and wonderful animals are formed in the process of speciation and the formation of new species. Different selection pressures select for different characteristics. Over generations, the individuals...
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What is Diabetes?
What does diabetes mean to you? Something to do with sugar right? Would you be shocked if I told you that every 6 seconds someone dies from diabetes? One in 11 adults worldwide has diabetes, with 1 in 2 not being diagnosed. So it is...
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Chemical Equations
Chemical equation shows the overall chemical change of reactants into products. It's a bit like a detailed cooking recipe, but where all the ingredients and all the products are written down, even the ones you can't necessarily see. The...