Reactions

• Complete combustion is when all carbon burns into CO2 and hydrogen burns into H2O
• The general equation for combustion is Fuel + Oxygen -> Carbon dioxide + Water vapour + Energy (heat)
• Incomplete combustion occurs if there isn't enough oxygen to fully react with the fuel, resulting in soot or smoke.
• Combustion reactions involve the burning of a fuel in the presence of an oxidizing agent to produce energy.
• In decomposition, a single reactant breaks down into two or more new substances.
• The reaction between hydrogen gas and oxygen gas produces water.
• Incomplete combustion occurs if there isn't enough oxygen to completely react with the fuel, so some unburned fuel remains as solid or liquid particles.
• Carbon monoxide is produced from incomplete combustion
• Soot is formed when carbon doesn't have time to burn completely during incomplete combustion
• Decomposition can be represented by the formula A → B + C.
• Chemical changes are often accompanied by physical changes such as color changes, temperature changes, or the production of gases.
• A chemical change involves a rearrangement of atoms within molecules, leading to the formation of one or more different substances.
• Decomposition can be represented by the formula A → B + C
• An oxidising agent is a substance which gains electrons during a reaction.
• In an incomplete combustion, the is yellow
• In a complete combustion, the is blue
• Combustion is a chemical process in which a substance reacts rapidly with oxygen and gives off heat or energy
• Oxidation is when a substance loses electrons
• A reversible reaction is a chemical reaction in which the reactants react to form the products and simultaneously the products again form the reactants
• How does the mass change when the reactant or product is a gas?

  If a gas escapes, the total mass will look as if it has decreased and vice-versa
• What is a reversible reaction?

  a reaction that can be reversed by the same process that caused it to happen
• calcium oxide is made from the thermal decomposition of marble