Substrand: "8.3 Chemical reactions and everyday uses"
(12 periods)
When substances combine to form new substances we say that a chemical reaction has taken place. Some chemical reactions are fast; others are slow. Factors influencing rate of reaction are temperature, amount in reaction (concentration), catalysts, and size of particles (surface area.) Chemical reactions occur constantly in and around us.
8.3.1.1 state that in a chemical reaction materials/substances combined together (react) to produce a new substance called products 8.3.1.2 state in a chemical equation that reactants are on the left hand side and products are on the right hand side (e.g. reactants → products) Use word equations only
8.3.2.1 identify some basic chemical reactions that are happening around us and state the reactants and products; i. rusting of iron nails, mixing ii. lemon juice with coral, iii. burning of firewood, iv. chewing betel nut v. lime making
8.3.3.1 demonstrate the reactions and write word chemical equation for the reactions; i. rusting of iron nail, ii. lemon juice with coral iii. burning of firewood, iv. chewing of beetle nut, iv. lime making (baking of coral)