Chemical Reactions

• Rate of reaction can be increased by adding heat, increasing surface area, increasing concentration of reactant or by adding catalysts
• Rate of reaction is the speed which a chemical reaction occurs
• Catalyst speeds up the rate of reaction without being used up itself
• Exothermic reactions are chemical reactions that release energy by light or heat, like a burning candle, an ice cube , burning of sugar.
• Endothermic is chemical reactions which the reactant absorbs heat energy from the surroundings to form the products like photosynthesis, liquid evaporation, baking bread.
• A word equation represents a chemical reaction
• Reactants are always on the left and products on the right
• Balanced equations have equal numbers of atoms on both sides