What does NAT 5 learn in chemistry?
You will learn about the applications of chemistry in everyday contexts such as medicine, energy and industry, as well as its impact on the environment and sustainability. You will learn how to think creatively and independently, and analyse and solve problems.
How do you beat n5 in chemistry?
This book contains all the advice and support you need to revise successfully for your National 5 exam. It combines an overview of the course syllabus with advice from a top expert on how to improve exam performance, so you have the best chance of success.
How long is the Nat 5 chemistry exam?
1 hour and 40 minutes
Duration: aim to complete in 1 hour and 40 minutes. This will leave you 10 minutes to spare for a final check over your answers and any questions you have left to revisit.
What is a molecule National 5?
A molecule is a group of atoms held together by covalent bonds. A diatomic molecule is a molecule containing only two atoms.
Is Helium a covalent network?
These are the Noble Gases, Helium, Neon and Argon. They are completely unreactive and exist as single atoms (monatomic) held together only by weak intermolecular forces (called London Dispersion Forces). Boron, silicon, carbon (diamond) and carbon (graphite) exist as covalent networks.
Are simple molecules strong?
Simple molecules contain only a few atoms held together by covalent bonds . However, although the covalent bonds holding the atoms together in a simple molecule are strong, the intermolecular forces between simple molecules are weak.
How is o2 bonded?
Each oxygen atom is two electrons short of a full outer shell, so each oxygen atom shares two of its electrons with the other atom, so both oxygen atoms have a full outer shell. The oxygen molecule is held together by the strong O=O. oxygen–oxygen double covalent bond by sharing electrons.
Why is Group 8 Monatomic?
All noble gases have the maximum number of electrons in their outer shell; i.e. 2 electrons for helium and 8 for the other five. Noble gases are monoatomic, which means they exist as single atoms. This is because of their electronic stability.
Is gold a compound?
No, gold is not considered a compound. A compound is formed when two or more different kinds of elements form chemical bonds to hold each other together. Gold is not bonded to any other element. Therefore, it is not a compound.
What is a giant covalent?
name: Giant Covalent Structures. Substances with giant covalent structures are solids with very high melting points. All the atoms are linked by strong covalent bonds, which must be broken to melt the substance. Examples are diamond, graphite (types of carbon) and silicon dioxide (silica).
Why are metals bent and shaped?
Metals are malleable – they can be bent and shaped without breaking. This is because they consist of layers of atoms that can slide over one another when the metal is bent, hammered or pressed.