Yes, water expands when it freezes. Note that the word “expands” here indicates an increase in volume. So, a technically sound way to put it would be—water’s volume increases when it freezes. This statement is accurate, and you can test...

This video covers:

0:21 - What a molecu
le is
1:11 - What a c
ompound is
3:11 - How to use brackets in a c
hemical formula
4:48

- What a mixture is
r/>This vid
eo is suitable for
:
- All tiers
- All exam...

This video covers how covalent bonding works, how to show it with dot and cross diagrams, and the types of substances that covalent bonds can form.

This video covers:

- What condensation polymers
are
- How they're made from dicarboxylic acids
and diols
- How the monomers join togethe
r (ester bonds)
- How to
write the equations
- Why condensation...

This video covers:

- Alcohols are a homologous series of organic compounds with an OH functional g
roup
- How to
name them
- Their properties: flammable, soluble and they c
an be oxidised
- Their uses: as...

This video covers:

- The idea that the carbon-carbon double bond can break, which allows the carbons to bond to new a
toms
- How alkenes react with hydrogen to fo
rm alkanes
- How alkenes react with water to
form...

This lesson covers:

- What active transpor
t it
- How it's different to
diffusion
- How root hair cells are adapted to absor

b mineral ions


Exam board specific info:r/>AQA - Suitable for...

Everything you need to know about polymers!<b<br/>r/>

Polymers are large molecules made up of lots of repeating units called monomers. This video covers: how to identify them, how to draw them, and their properties.

In this video you'll learn:<br/>
- What hydro<br/>carbons are<<br/>br/>- What alkanes are
<br/>- The general formula for alkanes
- An example of using that general formula to work out the molecular formula of 'octane'

Atoms and Elements: Defining Terms distinguishes the differences between an atom, an element, a molecule, and a compound.

Exploring Carbohydrates identifies the primary functions of carbohydrates by describing how carbohydrates are used as a structural component, for energy storage, and as a source of energy in living organisms.

Atomic Theory describes the scientific theory of atoms by explaining that all matter is composed of parts too small to be seen without magnification.

This video will explain the concept of a mole and how to calculate the molarity of a solution using concentration of solutions.

Solar physicist Jenny Nelson, Imperial College, describes the importance of using the combination of computer models and laboratory experiments to understand the nature of materials involved in the development of solar cell technology.

Renowned polymath Freeman Dyson (Institute for Advanced Study) gives his take on the origin of life.

A video explaining and illustrating all steps of DNA replication including an overview of replication, an explanation of the leading and lagging strands, and the replication bubbles.

Factors Affecting Enzyme Function explains how changes in pH, temperature, and concentration levels can affect enzyme function.

A video entitled “Classifying Matter” which discusses the physical characteristics of matter, including how those characteristics can be used to understand, study, and experiment on all states of matter.

“Matter: How Do Scientists Use It to Create Technologies?” introduces atomic theory to explore how matter interacts and combines to form new and useful things.

Have you ever wondered why pineapples sting your tongue? It's because they contain an enzyme called bromelain, which can break down proteins. This means that every time you eat a pineapple, it eats a little bit of you!



In this...

Matter construction | summary

Water | Summary

Properties of molecules

Element and compound