5.1 All matter is made up of atoms Matter and Chemical reactions Learning intention To be able to describe a substance as an atom, element or compound and identify how many atoms are in each molecule. I can classify substances as element or compound, atom or molecule Success Criteria I can identify the different elements in a molecule I can identify how many different elements, and how many atoms of each, in a molecule. What is an atom? An atom is… • The smallest particle of matter. Matter is… • stuff and things. All substances are matter. • So… All substances are made from atoms. Elements An element is… • A substance that is made from one kind of atom only. • It cannot be broken down into simpler substances. Compounds A compound is… • A substance made from more than one kind of atom. Molecules How many atoms are in the molecule? • A molecular element is formed when two or more atoms of the same element bond together. • A molecular compound is formed when two or more atoms from different elements bond together. • The small numbers tell you how many atoms of that element are in the molecule. Task 1. Group the molecules below into either Molecular elements or molecular compounds H2O H2 CO2 N2 Cl2 HCl P4 C4H8 S8 2. How many of each element are in each molecule? Polymers • Some compounds are molecular, others are made up of repeating chains of the same atoms. • These are called polymers and have a lattice structure. • Polymers are used to create plastics. What properties do plastics have? Task • Complete the task on your handout. • Identify the substances as elements, compounds, molecules and atoms as required. • Complete the checkpoint questions–See handout Homework check If your answer is correct, give yourself a tick, if your answer needs fixing then do it! Explain the difference between an element, a mixture and a compound, use a picture to help in your explanation. What is the difference between a molecular compound and a polymer? Use a picture to help your explanation. Ammonia is a gas that contains molecules with the formula NH3. What elements are present in ammonia and how many of each atom is there in each ammonia molecule? Summarise this lesson into 3 key points.