Chemistry

• The mass of a proton is 1 and it's charge is positive
• The mass of a neutron 1 and it's charge is neutral
• The mass of an electron is 1/2000 and it's charge is negetive
• Atoms are made up of protons, neutrons and electrons
• In an exothermic reaction, heat is given out
• In an exothermic reaction, chemical energy is converted to heat energy
• In an exothermic reaction, products are at a lower enthalpy then reactions
• In an exothermic reaction, temperature of the surroundings increase 
• In an endothermic, heat is taken in
• In an endothermic reaction, products are higher enthalpy then reactants

  
• Enthalpy means chemical energy
• A catalyst is a substance which speeds up a reaction but which is unchanged at the end of the reaction
• Catalysts provide and alternative pathway of lower activation energy
• Activation energy is the minimum amount of energy needed for a reaction to occur
• For a chemical reaction to happen, reacting particles must collide