Year 8 Chapter 8 Science

What is an exothermic reaction?

• A chemical reaction in which energy is given out to the surroundings.

• A chemical reaction in which energy is absorbed from the surroundings.

• A reaction that is exothermic.

• Hydrothermic reaction

What must be present for burning to occur?

• Oxygen and Fuel

• Oxygen, Heat and Fuel

• Oxygen

• Fuel

What is an endothermic reaction?

• A chemical reaction in which energy is taken from surroundings.

• 1. A reaction that releases heat to the surroundings.

  
  

• A process that only occurs at high temperatures.

• An event where the reaction loses energy to the environment as heat.

What is the scientific name for rust?

• Flaky brown stuff

• Oxide Iron

• Iron Oxide

• Iron Oxygen

What is a chemical reaction in which a substance combines with oxygen.

• Rusting

• Oxidation

• Galvanizing

• Oxygen

What is the term for covering iron with a layer of zinc, which also prevents oxygen from reaching iron.

What new substance is formed when a substance burns?

• Oxide

• Substance

• Oxidation

• Smoke

What is the equation for metals reacting with water?

• metal hydroxide + hydrogen

• metal hydroxide + oxygen

• metal oxide + hydrogen

• metal hydroxide

How are reactive metals stored?

• In water

• In a vacuum

• In a container

• Underneath oil

Answer explanation

What is the equation of iron reacting with hydrochloric acid?

• Iron + Hydrochloric Acid -> Iron Chloride + Hydrogen

• Iron + Hydrochloric Acid -> Iron Oxide + Chlorine Gas

• 1. Iron + Hydrochloric Acid -> Iron Sulfide + Hydrogen Gas

• 1. Iron + Hydrochloric Acid -> Iron Carbonate + Oxygen Gas