Gcse Physics - Triple Science Already Passed

Kinetic energy in a gas {Ans: Highest amount of energy, can move in random directions at high speeds}What direction do electrons flow and what is this called? {Ans: Negative to Positive - Electron Flow}Density equation: {Ans: Density = mass/volume}When the volume increases, density.... {Ans: decreases}Do mass and density change between states? {Ans: Density does, mass doesn't}How to add vectors : {Ans: The start of the first vector to the end of the second vector is the total vector}