Curated Video
Reactivity Series: Comparing the Reactivity of Group 1 and Group 2 Metals
We compare the reactivity of Group 1 and Group 2 metals. We add sodium and then potassium to water. We observe the reactions. Next we add magnesium and then calcium to hydrochloric acid and observe the reactions. The results let us put...
Curated Video
Bouncing Eggs
We use vinegar to remove the shells from eggs without breaking them. Two eggs are placed in a beaker of vinegar, but one is half coated with clear nail polish. The exposed shells dissolve over time and the eggs swell as more water moves...
Curated Video
Stomach Acid and Antacid
We use the enzyme pepsin and hydrochloric acid to simulate the conditions within the stomach in two boiling tubes. Cooked egg whites are ground and added to two boiling tubes of hydrochloric acid, but one is mixed with a crushed antacid...
Curated Video
Citrus Fruit Battery
We use lemons and strips of zinc and copper to make a battery. First, strips of copper and zinc are added to one lemon and they are connected across a voltmeter. This is repeated, this time with more lemons and metal plates, until a...
Curated Video
Acidification of Water
We use a drinking straw, some water and universal indicator to show that breathing out creates acid. Universal indicator is added to the water to show its pH value. When we blow into the water the indicator changes colour showing that...
Curated Video
Agar Cube Diffusion
We use coloured agar cubes to see how different shapes change the rate of diffusion. The cubes are made using sodium hydroxide and phenolphthalein indicator to give them a pink colour. When these are added to hydrochloric acid, the...
Curated Video
Inflating Glove
We inflate a rubber glove using the gas produced during a neutralisation reaction. Bicarbonate of soda is added to vinegar in a beaker covered by a rubber glove and it expands. The gas is used to extinguish a flame, showing that it is...
Curated Video
Neutral
In between two extremes, neither one thing nor another. A Twig Science Glossary Film. Key scientific terms defined in just 60 seconds using stunning images and concise textual definitions. Twig Science Glossary Films reinforce abstract...
Curated Video
Salt
In chemistry, an ionic compound containing positive metal ions and negative non-metal ions. A Twig Science Glossary Film. Key scientific terms defined in just 60 seconds using stunning images and concise textual definitions. Twig Science...
Curated Video
The intestines
Case study of the role of the intestines in digestion. Life processes - Body systems - The digestive system Learning Points The intestine is divided into the large and small intestine. Nutrients from food are absorbed into the...
Curated Video
Healthy Teeth - Tooth Care
Top tips for keeping your teeth healthy. Life processes - Humans and other animals - Teeth Learning Points Bacteria in the mouth produce plaque. Acid produced by plaque attacks the enamel on teeth. Brushing teeth twice a day helps...
Curated Video
The mystery of the narwhal tooth
The narwhal is known as the 'unicorn of the ocean' ... but what exactly is that horn for? Life processes - Humans and other animals - Teeth Learning Points The narwhal's unusual tooth is a sensory organ. A Twig Context Film. Reinforce...
Curated Video
Function of teeth
Why do we have teeth and how are they different to those of other animals? Life processes - Humans and other animals - Teeth Learning Points Different teeth serve different functions. Carnivores, omnivores and herbivores have different...
Curated Video
Symmetry and Optical Activity: Do Your Molecules Have It?
Symmetry and optical activity are intricately linked in organic molecules. A molecule is optically active if it can rotate the plane of polarized light. Optical activity arises from the molecule’s lack of symmetry—specifically, its...
Curated Video
Inductive Effect Consequences: How Molecules React!
The inductive effect can drastically alter how molecules behave in reactions. Electron-withdrawing groups can increase a molecule’s electrophilicity, making it more likely to accept electrons in a reaction. Conversely, electron-donating...
Brave Wilderness
Experiencing the Acid Spray of a Violin Beetle
On this adventure, Mark is in Thailand tracking down the acid-spraying Violin Beetle! Will he be able to find this bizarre insect? And is it as dangerous as the legends say? Watch to find out!
Curated Video
I WONDER - Why Do We Need Acids And Bases?
Jump into 'Why Do We Need Acids and Bases?' to discover the amazing roles they play in our lives and the environment! A quick, zesty look at chemistry, perfect for eager young learners.
Curated Video
I WONDER - Why Do We Need Acid-base Reactions?
Explode into 'Why Do We Need Acid-base Reactions?' to see the exciting ways these mix-ups shape our world! A quick, bubbly adventure into science, perfect for curious young minds.
Curated Video
I WONDER - Why Do We Measure PH?
Dive into 'Why Do We Measure pH?' to find out how this tiny scale helps us tell if something is sour or slippery! A quick, fascinating look at chemistry in our daily lives, perfect for young scientists.
Curated Video
I WONDER - What Is The Ph Scale?
Slide into 'What Is The pH Scale?' to discover the colorful world between acids and bases! A quick, exciting dip into science, ideal for kids who love to explore.
Curated Video
I WONDER - What Is Neutralisation?
Jump into 'What Is Neutralisation?' to see what happens when acids and bases mix and make peace! A quick, exciting experiment in chemistry, great for kids who love to see reactions.
Curated Video
I WONDER - What Is Base?
Slide over to 'What Is Base?' to discover the slippery, soapy world of bases and how they react with acids! A quick, engaging dive into chemistry, ideal for curious kids ready to learn.
Curated Video
I WONDER - What Is An Acid Indicator?
Swirl into 'What Is An Acid Indicator?' to see how scientists use special colors to uncover acids and bases! A quick, colorful experiment into chemistry, ideal for kids who love to discover.
Curated Video
I WONDER - What Is An Acid?
Dive into 'What Is An Acid?' to uncover the sharp, sour world of acids and their amazing reactions! A quick, bubbling journey into science, perfect for curious young chemists.