Secondary Catalogue

In this episode, we take a deeper look at pH and explain how the numbers on the pH scale are actually related to the number of H⁺ or OH⁻ ions present in an acid or a base. We then descend even deeper down—to the atomic level—to explain what actually happens when acids react with bases and what actually happens when acids react with metals. We introduce students to ionic equations and to the role (or lack thereof) of spectator ions in many chemical reactions. This episode can be thought of as an extension to middle school acid-base chemistry or as an introduction to senior school acid-base chemistry. Show Less

Learn all about the states of matter - solid, liquid and gas. What are reversible and irreversible change? What are physical and chemical changes? These questions and more are covered in depth with detailed graphics, engaging examples and exciting video. On-screen, multiple-choice reviews at the end of each segment reinforce important points and make learning fun. Show Less

In the fourth episode of this series, we take an in-depth look at H⁺ and OH⁻ ions and we explain how the pH scale is used to express how strongly acidic or how strongly basic a particular environment is. We examine how the pH of natural environments affects plant and animal life and how the human body has to carefully control the pH of our organs. Show Less

In the third episode, Neutralisation, we explain what bases are and then take a look at what happens when acids and bases chemically react. We also take a look at acid-base indicators, which are chemicals that change colour depending on whether they are in an acid or a base/ Show Less

In this episode, we describe what carbonates are and explain how they react with acids. If it wasn't for carbonates, our own stomach acid would kill us, acid rain would have destroyed our forests, and—worst of all—our pancakes wouldn't be as soft and fluffy as they are. Show Less

In Acids in Industry, we look at what acids are, how they're made, and how they're used in steel making and agriculture. We also take a quick trip back to the 1770s to look at how acids were used by Captain James Cook to save his crew from the disease that killed more sailors than shipwrecks and sea battles! Show Less

If movies have taught us anything, it's that the first person to enter a spooky cave is the first to get in trouble! Will First Mate Phil survive to see the light of day? This lesson will shine a light on the chemical properties of metals, non-metals and metalloids. Show Less

A poisoned umbrella and a forensic investigation…using an unusual and as-yet-unsolved true crime as a launching place, this video shows that the chemistry of matter matters. Elements, as represented on the periodic table, are made up of only one type of atom. Using mercury—and mercury poisoning—as an example, this video examines the chemical and structural qualities of elements and the anomalies that make mercury unusual. Complemented by clear graphics, it is essential viewing for students of chemistry. Show Less

Long Jane Silver and Senor Ortega analysed the soil sample and saved the cocoa trees! But something's not right... Did they perform the wrong steps? Was their sample contaminated? This lesson will assess the accuracy, reliability and validity of the gravimetric analysis experiment in the previous lesson. Show Less

This programme is about seawater. It is the most important liquid on Earth, not only from its sheer volume, but also because it has remarkable qualities. A few of them, like buoyancy, are common to all liquids - but seawater is also the cradle of life. Three key factors of water underpin life in the sea: water’s dissolving power, its tendency to keep a stable temperature, and its transparency to light. This programme explains the mechanisms and the outcomes of these key facts—and other things—that make seawater both weird and wonderful. Show Less

The chemical reactivity of metals increases from the top to the bottom in a group, while the chemical reactivity of non - metals decreases as we move down in the group. On moving down in a group of the Periodic Table, there is no change in the nature of the oxides of the elements. Show Less

How is chemical equilibrium important for making ammonia? This video demonstrates how an understanding of chemical equilibrium and Le Chatelier’s principle is applied in the Haber-Bosch Process, making the production of ammonia more efficient. Clear explanations of the theory behind the process make this essential viewing for senior secondary chemistry students. Show Less

What happens when you add more product to an equilibrium? This video demonstrates how an increase in products affects reaction rates in accordance with Le Chatelier’s principle. Students will observe how the appearance of a solution of sodium chloride changes when products are added. Footage of a real lab demonstration makes this essential viewing for senior secondary chemistry students. Show Less

What is an equilibrium constant and how do we work it out? This video explains various aspects of the equilibrium constant, including what it is, how to calculate it and how it can be affected by other factors like temperature and pressure. Easy-to-understand explanations and worked-through examples of Kc calculations make this essential viewing for senior secondary chemistry students. Show Less

How is chemical equilibrium important for cellular respiration? This video explains how two competing equilibrium reactions involving haemoglobin are at work in the process of cellular respiration. Clear explanations of this life-or-death example of competing equilibria make this essential viewing for senior secondary chemistry students. Show Less

What happens when you increase the pressure on an equilibrium? This video demonstrates how changing pressure affects reaction rates in accordance with Le Chatelier’s principle. Students will observe the colour of a gaseous mixture of nitrogen dioxide and dinitrogen tetroxide under different pressure conditions. Footage of a real lab demonstration makes this essential viewing for senior secondary chemistry students. Show Less

What happens when you turn up the heat in an equilibrium? This video demonstrates how changing temperature affects reaction rates in accordance with Le Chatelier’s principle. Students will observe the colour of a solution of cobaltous chloride at different temperatures. Footage of a real lab demonstration makes this essential viewing for senior secondary chemistry students. Show Less

What happens when you remove products from an equilibrium? This video demonstrates how a decrease in the amount of product affects reaction rates in accordance with Le Chatelier’s principle. Students will observe how the appearance of a solution of zinc hydroxide changes when hydrochloric acid are added. Footage of a real lab demonstration makes this essential viewing for senior secondary chemistry students. Show Less