Hi there! Thank you for viewing my profile. I am currently a second year Chemistry student at the University of Liverpool - I remember all too well how daunting GCSE's and ALevels can be, but I made it through and I want to help you to do the same! I love my subject and believe that science is for everyone - it just needs explaining in the right way!
I studied with the AQA exam board for my GCSE's, and OCR at A Level, although I feel confident that I can tutor across a range of exam boards as most of the content is the same. I tailor each of my sessions to you, and understand that what works for some students doesn't work for others. I am patient and willing to listen and explain ideas in a range of ways until you find which way clicks for you.
I helped tutor my arts focussed friends who just 'couldn't do it' through their science GCSE's, as well as helping explain ideas to more science-based peers at A Level. I feel like tutoring can benefit everyone and that this extra interactive time and opportunity for one-on-one questions can be the difference between grades.
|Biology||A Level||£24 /hr|
|Chemistry||A Level||£24 /hr|
Kairen (Parent) April 30 2015
Kairen (Parent) March 14 2015
The body has many ways in which it can protect against pathogens (which are microorganisms which cause disease, such as harmful bacteria or viruses).
White blood cells are key in protecting against pathogens. They ingest the harmful microorganisms (they surround them and take them up - a bit like eating them, but you must use the word ingest).
Pathogens can produce harmful chemicals called toxins, and white blood cells produce antitoxins to destroy these.
Certain white blood cells called lymphocytes are responsible for producing the antibodies which destroy specific pathogens by detecting antigens (foreign chemicals released by the pathogen). Antibodies can bind to pathogens and damage/destroy them, or clump them together for easy ingestion by another type of white blood cell, the phagocyte.see more
Ionic bonding occurs when transfer of electrons takes place. One atom (or molecule) donates one or more electrons to another. Since electrons have a negative charge, this leaves the donating atom electron deficient (+ve charged ion) and the other atom electron rich ( -ve charged ion). The ions then attract each other through electrostatic forces of attraction as they are oppositely charged.
Covalent bonding occurs when atoms/molecules share pairs of electrons.
Metallic bonding is bonding that occurs in metals. This leads to giant structures of metal atoms arranged in a regular pattern. The outer shell electrons of metals are delocalised (free to move around) and so a metallic structure is a regular arrangment of +ve charged ions with negative electrons in between, held together by electrostatic forces of interaction.see more