| A | B |
|---|
| momentum | mass x velocity |
| reaction force | half of an interaction pair |
| kinetic energy | 1/2 m x v2 |
| work done | force x distance |
| Joules | unit for energy |
| zero resultant force | condition for steady speed |
| velocity | speed in a specified direction |
| lithium | least reactive alkali metal |
| bromine | liquid element |
| copper | example of transition metal |
| halogen | name for group 7 elements |
| alkali metal | name for group 1 elements |
| atomic number | number of protons in atom |
| atomic mass number | protons + neutrons |
| nucleus | centre of atom |
| eight | number of electrons in full second shell |
| ion | atom with unbalanced charge |
| Na Cl | ionic compound |
| diffusion | natural mixing of particles |
| enzymes | these speed up chemical reactions |
| urea | poisonous chemical removed by kidneys |
| hypothalamus | key gland controlling temperature |
| ADH | controls water reabsorption by kidney |
| pituitary gland | releases ADH when needed |
| vasoconstriction | narrowing of capillaries |
| vasodilation | widening of capillaries |
| sweating | mechanism for lowering temperature |
| shivering | mechanism for raising temperature |
| lock and key | explanation for enzyme action |
| partially permeable membrane | key component in osmosis |
