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Heat is a form of energy - the more heat a particle has, the more energy it has, and so the faster it moves. This increases the number of collision is a set period of time, whilst also increasing the numb...

Giant covalent structures are made up of many covalent bonds between atoms. They have high melting points because it takes a lot of energy to break the strong covalent bonds between the a...

H₂SO₄ ---> 2H⁺ + SO₄^{2-                                                                                                                                  ...}

Mass of the isotope/atom compared to 1/12th the mass of an atom of Carbon 12 (12C)

Persists in the environment/soil/water. Enters the food chain and builds up the higher up the chain you move. Can enter human tissue eventually.