Reactions

Question 1

Exothermic Reactions

Answer 1

• If the energy stored in the reactants is greater than the energy stored in the products, the reaction is exothermic. - They usually feel warm.

Question 2

Endothermic Reactions

Answer 2

• If the energy stored in the reactants is less than the energy stored in the products, the reaction is endothermic.
• They usually feel cold.

Question 3

Combustion

Answer 3

• Combustion is a chemical process or a reaction between Fuel (Hydrocarbon) and Oxygen.
• When fuel and oxygen react it releases heat and light energy.
• Heat and light energy then result in the flame.
• Hydrobcarbon + Oxygen = Heat energy.

Question 4

Respiration

Answer 4

• Respiration is the chemical process by which organic compounds release energy.
• The compounds change into different ones by exergonic reactions.

Question 5

Corrosion

Answer 5

• Corrosion, wearing away due to chemical reactions.
• It occurs whenever a gas or liquid chemically attacks an exposed surface.
• Accelerated by warm temperatures and by acids and salts.

Question 6

Decomposition

Answer 6

• A decomposition reaction can be defined as a chemical reaction in which one reactant breaks down into two or more products.
• Decomposition is the breakdown or change of a material or substance.

Question 7

Combination

Answer 7

• A combination reaction is a reaction in which two or more substances combine to form a single new substance.

Question 8

Neutralisation

Answer 8

• Neutralisation is the reaction between an acid and a base.

Question 9

Acids and Metals

Answer 9

• Acids react with most metals and, when they do, a salt is produced.

Question 10

Acids and Carbonates

Answer 10

• When acids react with carbonates, such as calcium carbonate, a salt, water and carbon dioxide are made.