𝐬𝐜𝐢𝐞𝐧𝐜𝐞

• What is the general equation for combustion?

  Fuel + Oxygen -> Carbon Dioxide + Water
• What is a reaction profile?

  A diagram which shows whether the reactants have more or less energy than the products.
• Give two examples of endothermic reactions

  Thermal decomposition reactions, citric acid and sodium hydrogencarbonate
• What is an endothermic reaction?

  A reaction where energy is transferred from the surroundings
• State two uses of exothermic reactions

  Self-heating cans, hand warmers
• What happens to the temperature of the surroundings during an exothermic reaction?

  They increase.
• What is an oxidation reaction?

  A substance combining with oxygen
• Define "exothermic"

  A reaction which gives out energy
• If the reactants have less energy than the products, what kind of reaction must have taken place?

  An endothermic one. The extra energy has been take in by the surroundings
• What is "combustion" more commonly known as?

  Burning
• State two uses of endothermic reactions?

  Some cooling sports injury packs
• Define "endothermic"

  A reaction which takes in energy
• What are products?

  The substances formed when reactants have a chemical reaction.
• What is the general equation for an oxidation reaction?

  Metal+Oxygen -> Metal oxide
• What are reactants?

  The substances involved in a chemical reaction
• If the reactants have more energy than the products, what kind of reaction must have taken place?

  An exothermic one. The missing energy has been transferred to the surroundings
• Give two examples of exothermic reactions.

  Combustion, respiration
• Define "combustion"

  A reaction with oxygen in which energy is transferred to the surroundings
• What is a fuel?

  A substance which when reacted with oxygen releases energy
• What happens to the temperature of the surroundings during an endothermic reaction?

  They decrease. The thermometer is included in "the surroundings" so shows the temperature decreasing
• Which gas enters the blood from the lungs?

  Oxygen
• What happens to the rib muscle when you breathe out?

  Relaxes
• What happens to your rib cage when you breathe out?

  moves down and in
• What is the name of the small air sacs in your lungs?

  alveolus/alveoli
• What happens to your chest pressure when you breathe in?

  decreases
• What happens to your chest pressure when you breathe out?

  increases
• What gas makes up the highest percentage of the atmosphere?

  nitrogen
• What bones protect the lungs?

  ribs
• What happens to your chest volume when you breathe in?

  increases
• What is the name of the tube through which air reaches the bronchi?

  trachea
• What is the name of the small tubes in your lungs?

  bronchioles
• What happens to the rib muscle when you breathe in?

  contracts
• Which organ carries out gas exchange?

  lungs
• What is the name of the system responsible to breathing?

  respiratory system, gas exchange system
• What happens to your chest volume when you breathe out?

  decreases
• Which gas leaves the blood from the lungs?

  carbon dioxide
• What happens to your diaphragm when you breathe in

  contracts and moves down
• What happens to your diaphragm when you breathe out

  relaxes and moves up
• What happens to your rib cage when you breathe in?

  moves up and out