PBS
Where Are All The Squid Fossils?
It might surprise you but cephalopods have a pretty good fossil record, with one major exception. If squids were swimming around in the same oceans as their closest cousins, where did all the squids go?
SciShow
The Weird Reason More Bridges Are About to Fail
While they are incredible engineering marvels, we don't think about bridges all that much. But there's a good reason we should all be thinking about our bridges, since there's a weird reason that more of them might be at risk of failure...
SciShow
Can Climate Change Make Lightning… Supercharged?
The oceans absorb a lot of CO2, leading to a variety of effects like ocean acidification. But you might not expect one of those effects: stronger lightning strikes.
SciShow
If There's Acid Rain, Is There Basic Rain?
You've probably heard of acid rain: rain that's more acidic than normal because of pollution in the atmosphere. But, if rain can become more acidic, shouldn't it also be able to become more basic?
Bozeman Science
pH and Buffers
In this video Paul Andersen explains how buffer solutions maintain pH in a solution. A buffer solution is made up of a weak acid and its conjugate base. As strong acids or bases are added the pH remains stable. A good buffer solution has...
SciShow
What Does My Pee Say About Me?
The pee you just flushed without thinking could be a great sample to know what is going on in your body!
SciShow
The Strongest Bases in the World
Acids are widely considered to be the scariest chemical compounds of all, but bases can be just as powerful. Most powerful of all are a special class of pH scale-defying bases called superbases!
Amoeba Sisters
Enzymes (Updated)
The Amoeba Sisters explain enzymes and how they interact with their substrates. Vocabulary covered includes active site, induced fit, coenzyme, and cofactor. Also the importance of ideal pH and temperatures for enzymes are discussed.
Bozeman Science
Acid-Base Equilibrium
In this video Paul Andersen explains how acid-base chemistry can be understood in terms of equilibrium. Water is present in all acid-base chemistry and is amphoteric in nature. The Ka and Kb values can be used to determine the strength...
Bozeman Science
Ocean Acidification
In this video Paul Andersen shows how carbon dioxide in the atmosphere is causing a decrease in the pH of the oceans. The carbon dioxide combines with the water to create carbonic acid which dissociates into bicarbonate and carbonate...
Bozeman Science
Acids, Bases, and pH
Paul Andersen explains pH as the power of hydrogen. He explains how increases in the hydronium ion (or hydrogen ion) concentration can lower the pH and create acids. He also explains how the reverse is true. An analysis of a strong acid...
Curated Video
Turmeric Acid Base Indicator Experiment
Check out this cool experiment in which Dr. Boyd uses the seasoning Turmeric as an indicator for acids and bases.
0:00 – Introduction
0:21 – What you need
0:53 – Brief explanation of acids and bases
2:15 – Safety Discussion
2:36 –...
Curated Video
Ácido
Compuesto que se disuelve en agua y forma una disolución con un pH menor de 7.
Twig - Química
Curated Video
La escala de pH
Examina la escala de pH y averigua si una solución es ácida, alcalina o neutra.
Twig - Química - Las reacciones - Los ácidos y las bases
Claves de aprendizaje
La escala de pH permite determinar si una sustancia es ácida o...
Curated Video
Los ácidos y los álcalis (segunda parte)
Los álcalis y los ácidos pueden neutralizarse para numerosos y distintos fines. Por ejemplo, las reacciones de neutralización nos permiten respirar bajo el agua o que las indigestiones las llevemos de forma más aliviada
Twig -...
Curated Video
Los ácidos y los álcalis (primera parte)
Las propiedades de los ácidos y los álcalis fuertes pueden ser muy dañinas. ¿Dónde los encontramos? ¿Cómo podemos saber como de ácida o alcalina es una sustancia?
Twig - Química - Las reacciones - Los ácidos y las bases
Claves...
Science ABC
Is Your Stomach Acid (Gastric Acid) Diluted When You Drink Water?
Short answer: Yes, drinking a lot of water will certainly change the pH of the stomach, but this amount is trivial. However, since your stomach is very acidic, to begin with, drinking water will not dilute it significantly. Also, there...
Science ABC
Why Are pH Values Only In A Range Of 0-14?
The pH scale is used to determine whether a substance is acidic or basic, and to calculate how strong a chemical it is. A pH value is a number that ranges from 1 to 14 for most common chemicals, with seven being the middle or neutral...
Curated Video
Indicator
A substance that provides a visual indication of the pH of a test material. A Twig Science Glossary Film. Key scientific terms defined in just 60 seconds using stunning images and concise textual definitions. Twig Science Glossary Films...
Curated Video
Acid
A compound which dissolves in water to form a solution with a pH of less than 7. A Twig Science Glossary Film. Key scientific terms defined in just 60 seconds using stunning images and concise textual definitions. Twig Science Glossary...
Curated Video
pH
The pH scale measures the acidity or alkalinity of a solution. 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...
Curated Video
Factpack: pH Scale
Explore the pH scale, and discover whether a solution is acidic, alkaline or neutral. Chemistry - Reactions - Learning Points. A Twig FactPack Film. Open a discussion on what has been already learnt in a topic, or use to grab attention...
Curated Video
Acids and Alkalis: Part 2
Alkalis and acids can be neutralised to great and varied effect. For example, it is neutralisation reactions that help us breathe underwater or cure indigestion. Chemistry - Reactions - Learning Points. A neutral solution is pH 7 Sodium...