chemical reaction

• the reactants are substances that take part in a chemical reaction
• an enzyme is a biological catalyst
• a catalyst is a substance that speeds up the rate of a chemical reaction without being used up
• a product is the substance formed when two or more reactants combine to form one or more products.
• in an exothermic reaction, energy is released as heat
• in an endothermic reaction, energy is absorbed from its surroundings
• a biological reaction is a reaction in living cells
• factors affecting the rate of reaction- temperature, surface area, particle size, catalayst
• smaller the particle size is faster the rate of reaction
• catalysts lower the activation energy
• physical change- no new substance is formed easy reversed
• chemical change- new substance is formed with different properties difficult to reverse
• law of conservation- mass cant be created or destroyed
• y axes- dependant variable
• x axes- independant variable
• activation energy- is the minimum amount of energy that reactant must have to react
• what is the chemical name for marble chips- calcium carbonate
• what is mass- is the amount of matter in an object
• how is mass measured- mass balance
• what is meant by the rate of reaction- how quick the reaction occurs