4.17 describe experiments to investigate the effects of changes in surface area of a solid, concentration of solutions, temperature and the use of a catalyst on the rate of a reaction

Factors that effect the rate of a reaction

Surface area

• Put a set mass of magnesium in hydrochloric acid
• Time the reaction
• Change the from of magnesium keeping the mass the same (powder, wire, strips)
• The more surface area (the smaller the pieces of magnesium) the faster the reaction

Concentration

• Put a set mass of marble chips into dilute hydrochloric acid
• Time the reaction
• Change the ratio of water to hydrochloric acid
• The more concentrated the hydrochloric acid (the lower the ratio of water) the faster the reaction

Temperature

• Put a set mass of magnesium powder into a set mass of hydrochloric acid
• time the reaction
• Carry out this reaction at different temperatures
• The higher the temperature the faster the rate of reaction

Catalyst

• If you have hydrogen peroxide it will not decompose
• If you put it with manganese dioxide it will decompose into water and oxygen
• The manganese dioxide will be unaltered by the reaction
• The more of the catalyst the faster the reaction

TAKEN FROM HANNAHHELPCHEMISTRY