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Fifty-four compelling Biology, Physics and Chemistry explainers for high school audiences.

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How do Two Gases Diffuse?
The diffusion of molecules is crucial for life. So what affects the diffusion of molecules and what cause gases to diffuse at different speeds?
What Happens When Metal Reacts with an Acid or Water?
This film explores how metals react with water, acids and oxygen, in terms of the reactivity series.
What is Paper Chromatography?
Paper chromatography is a way of identifying and separating compounds into different chemicals, based on how far each chemical travels up some filter paper dipped in solvent.
What is the Structure of the Atom?
Atoms are composed of a central nucleus, containing positively-charged protons and neutrally-charged neutrons. Smaller, negatively-charged electrons travel around the nucleus in layered orbits called shells.
How are Ionic and Covalent Bonds Formed?
Ionic and covalent bonds both involve the moving of electrons, allowing two atoms to each achieve complete outer shells. But how does this happen?
How are Chemical Equations Balanced?
If you're studying chemistry, you need to know how to balance your equations. This short film will explore how it is achieved.
What is Electrolysis?
Electrolysis is the breakdown of an aqueous or molten ionic compound when an electric current is passed through it. Easy? Well this film explores the process and makes it easier to understand.
What are Endothermic and Exothermic Reactions?
Hot or cold! What are endothermic and exothermic reactions, and how they can be depicted in reaction pathway diagrams?
What Factors Affect Reaction Rate?
What factors affecting rate of a reaction limited to temperature, concentration, pressure and surface area.
How do Equilibrium Reactions Work?
We explore how equilibrium reactions work, with reference to reversibility and changing conditions of temperature, pressure or concentration.
What is an Acid-base Titration?
In a laboratory how do we carry out an acid-base titration? We investigate.
What Tests Can Detect the Presence of Certain Gases?
How do we test for different gases? This short film shows how.
What are the Trends in the Periodic Table?
A short guide to the Periodic Table.
How is Iron Produced in a Furnace?
Have a blast in understanding how iron is produced in a furnace.
How is Ammonia Produced in the Haber Process?
What is the Haber Process and how does it work?
What are the Methods to Measure Rate of Reaction?
How the rate of reaction can be measured, and assessment of potential apparatus.
How Does the Greenhouse Effect Work?
Things are heating up. We explore how the greenhouse effect works, including causing global warming, climate change and consequent effects.
How Does the Digestive System Work?
What happens when you eat a burger? Where does it go and how does your body process it? This film helps you to digest the facts.
What is Natural Selection?
Natural selection is the gradual adaptation of a population to become more suited to its environment.
What is Mitosis and Meiosis
Mitosis and meiosis are both forms of cell division. This film explores how mitosis and meiosis occur.
What is the Human Fertilisation Process
It's all relative. How does the human fertilisation process work?
What is Synaptic Transmission
Have you got the nerve to explore synaptic transmission?
How Does the Urinary System Work
The kidneys are amazing as they filter blood to excrete urine. This film explores how this happens.
What is Active Immunity?
How active immunity happens in the body, via natural infection or vaccination.
How Does the Circulatory System Work?
Your heart is alway pumping blood around your body. This short film doesn't miss a beat, and explains how the circulatory system works.
What are Xylem and Phloem?
An outline of the functions of the xylem and phloem.
What is Photosynthesis?
Plants are essential for life on Earth by utilising photosynthesis. What is it, and what does it produce?
What is an Enzyme?
Enzymes are essential for life, and understanding how they catalyze reactions in the body will book your understanding of how our bodies work.
How do we Test for Biological Molecules?
Practical science is always enjoyable, so how can you test for 5 key biological substances?
How is Magnification Calculated?
From microscopes to cameras, how do we calculate magnification, and why is it important?
What is a Dichotomous Key?
A dichotomous key is a tool for classifying organisms based on how similar they are to each other. It involves asking a series of questions, each with only two possible answers.
How Does the Earth Orbit the Sun?
We explore how day and night and the seasons are created by the Earth’s orbit, and of how the phases of the moon are created by the moon’s orbit around the Earth.
How Does a Solenoid Work?
How does a solenoid work and what is its applications?
How are Relays Used in Circuits?
We explore how relays are used in circuits, how LDRs and thermistors could be used in such circuits, and how these components can be recognised.
How is Resistance Measured in a Wire?
Resistance lowers the current and the rate of electrons flowing through something. How does this happen in wires and how is it measured?
How are Objects Charged by Friction?
Friction charges objects by rubbing electrons from one object onto another, leaving one object positive and the other negative.
How are Magnets Made?
This is an attractive film. How are magnets created manually or via an electric current.
What is a Converging Lens and How Does it Work?
This film explains how converging lenses work and their applications.
What are the Properties of Waves?
A quick guide to the various properties of waves including reflection, refraction, and diffraction.
What is Convection in Liquid or Gas?
This film explores how convection works and how it is investigated in the lab.
How Does a Hydraulic System Work?
Take a break. Hydraulics help us in all areas of life. We explore how pressure is harnessed to stop a car and what the calculations are.
How is Energy Conserved?
The law of conservation of energy states that energy cannot be created or destroyed, it can only be stored, or converted into other forms of energy.
What is the Principle of Moments?
What is a moment and what is its principles? This film explores how the principle of moments applies to a beam’s movement around a pivot.
What Forces Act Upon an Object?
What is the first law of motion? What forces can act upon an object. Whether you're walking, sitting, throwing or driving, forces affect us all.
What Experiments Measure Density?
Measuring density is helpful in all walks of life. How do we do it and what are the calculations?
What are Distance-time and Speed-time Graphs?
How do Distance-time and Speed-time graphs work? This video explains.
What is Echolocation/Sonar?
This film explores how echolocation/sonar works, in technology and in animals. This film explores how echolocation/sonar works, in technology and in animals. This film explores how echolocation/sonar works.....
How Does an Electric Motor Work?
We use then everyday, but how does an electric motor work?
How are Empirical and Molecular Formulas Calculated?
This film explains how to calculate empirical and molecular formulae.
What is the Life Cycle of a Star?
This film explores the lifecycle of a star.
How is Acid Rain Formed?
Acid rain is formed when nitrogen dioxide, or sulfur dioxide, both produced by burning fossil fuels, reacts with water in the atmosphere to produce rain with a pH value below 5.
What is the Carbon Cycle?
What is the carbon cycle and how are humans changing it?
How is Gas Exchanged During Respiration?
Take in a breath of fresh air as we investigate how gas exchange occurs at the alveolus.
What is the Diffusion of Molecules?
The diffusion of molecules is crucial for life. We delve into the science of how diffusion occurs and what affects it.