During a journey inside different materials (water, sugar, etc.) you will see that the atoms in them arranged in bigger groups called molecules.
This lesson is a part of MEL Chemistry VR. Learn more →
molecules, atoms, bonds
- Learn that nearly all substances consist of molecules
- Find out that bonds between molecule atoms are strong and bonds between molecules are weak
- Find out that molecules can be small and large
Ask students to heat two substances (table salt and crystals of an organic compound, such as sugar, benzoic acid, etc.) with a low melting point. After the experiment, ask the students which substance is more probable to be molecular and why.
History and sources of knowledge
- The law of definite proportions was a big step towards the understanding of chemical compound formation.
- Modern methods of analysis like spectroscopy and mass-spectrometry show molecular composition.
Topics to discuss
- Particulate nature of matter (particles can be atoms, ions or molecules).
- The forces that keep atoms in molecules together. The forces that keep molecules together.
Fun facts and quotes
- There are up to 2 trillion molecules in one human cell. More than half of this number are water molecules.
- When you tear off plastic like polyethylene or polypropylene you actually tear off its molecules.
- Nearly all organic compounds are of molecular structure.
- Most smelly substances are of molecular structure.
- Which are stronger bonds between atoms in a molecule or bonds between molecules?
Calculate the number of atoms inside a molecule (hydrogen, water, acetic acid).