What does NAT 5 do in chemistry?
What does NAT 5 do in chemistry?
You will learn about how we use the Earth’s resources, the chemistry of everyday products and environmental analysis….You will learn about:
- rates of reaction.
- atomic structure and bonding related to properties of materials.
- formulae and reacting quantities.
- acids and bases.
What is a metallic bond Nat 5?
In metallic bonding, the outer electrons are delocalised (free to move). This produces an electrostatic force of attraction between the positively charged metal ions, and the negatively charged delocalised electrons.
What are isotopes in chemistry BBC Bitesize?
Isotopes are atoms with the same atomic number but different mass number. These two carbon atoms are isotopes. Each has the same number of protons but a different number of neutrons.
How long is the n5 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. Read the instructions on the front cover carefully before starting.
Why is a DC supply used in electrolysis Nat 5?
A d.c. supply must be used during electrolysis to ensure one product is formed at each electrode. An electrolyte is a liquid or solution which can conduct electricity.
What is an ionic bond Nat 5?
The ionic bond is the electrostatic force of attraction between a positively charged metal ion and a negatively charged non-metal ion. Metals form positive ions because they lose electrons to become stable.
What is electron sea?
In the “electron sea” model, atoms in a metallic solid lose their outer electrons and form a regular lattice of positive metallic ions. The outer electrons do not “belong” to any atom but form a pool or sea of delocalized electrons that are free and move randomly throughout the fixed lattice of positive ions.
What is the difference between an atom and an isotope?
Isotopes are atoms with different atomic masses which have the same atomic number. The atoms of different isotopes are atoms of the same chemical element; they differ in the number of neutrons in the nucleus.
Is every atom an isotope?
All elements have isotopes. There are two main types of isotopes: stable and unstable (radioactive). There are 254 known stable isotopes. All artificial (lab-made) isotopes are unstable and therefore radioactive; scientists call them radioisotopes.
How do I pass the NAT 5 exam?
How to Pass National 5 English
- Reading for Understanding, Analysis and Evaluation. 30 marks/30% Exam time: 1 hour.
- Critical Reading. 40 marks/40% Exam time: 1 hour and 30 minutes.
- Portfolio-writing. 30 marks/30%
- Performance-spoken language. Achieved/not achieved.
