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7F:Chemical Reaction
Revision Cards on Chemical Reaction
Question | Answer |
---|---|
How can you tell when a chemical reaction has taken place? | There will be a change in colour, an energy change or a gas will be given off |
What is the definition of decompose? | When one substance splits up into two or more products |
What percentage of air contains oxygen? | 20% |
What is the word equation for iron added to oxygen? | Iron + Oxygen -> Iron Oxide |
What is acid rain? | Acid rain is rain containing sulphuric and nitric acid |
What is the reaction when magnesium is heated? | Parts of the magnesium forms into a gas |
How can you test for pure oxygen? | Place a burning splint into a jar or pure oxygen. Take the splint out at blow it, leaving it to glow. Oxygen will make it burst into flames again! |
What happens when you cool down carbon dioxide to approximately -80°? | The carbon-dioxide will turn into dry ice |
Name three gases that can put a flame out. | Carbon dioxide, helium and nitrogen |
How are oxides formed? | Metals that are used in fireworks will burn in oxygen with a particular colour. This forms oxides! |
How can we be sure that more energy is given off a reaction? | Heat, light and sometimes sound are given off |
What extinguisher type is used for putting out a fire on petrol? | A foam (AFFF) extinguisher |
What effects does a fire extinguisher have on fires? | Fire extinguishers cool the fire down or stop oxygen getting to the fuel |
What is the fire triangle? | A way of showing in a diagram that heat, oxygen and fuel are needed for a fire |
What happens if you add water to an electrical fire? | You will get an electric-shock |
When a forest is on fire, what can help stop the fire from spreading? | A fire break. E.g. Streams or gaps between trees |
What is the definition of combustion? | The scientific word for burning |
What is wax made up of? | Carbon joined together with hydrogen |
Complete the word equation: Methane + Oxygen -> | Methane + Oxygen -> Carbon Dioxide + Water |
Why is energy not written in a word equation? | It is not a chemical substance meaning it is not a product |
What is Nitroglycerine? | Nitroglycerine is a very dangerous explosive. If you drop a bottle of Nitroglycerine, it will have enough energy to start an explosive reaction! |
Carbon Monoxide is a very poisonous gas. Name two features of carbon monoxide. | Carbon Monoxide doesn't smell and it is tasteless |
How is carbon dioxide produced? | When carbon is joined with oxygen in the air |
What is the word equation for combustion? | Fuel + Oxygen -> Carbon Dioxide + Water |
What is the name we give chemicals that are only made up of carbon and hydrogen? | Hydrocarbon |
What is a dry powder extinguisher used for? | Putting out fires involving metals or electrical fires |
Explain how ice is a reversible change. | Ice ca be melted into a liquid but when you place it in the freezer, it can turn back into a solid |
How can hydrogen and oxygen be split? | Electrical energy can split them apart |
What is rusting an example of? | Corrosion |
What is the best way for putting our an oil fire? | Cover it with sand, soil or a fire blanket |
What makes limewater go milky? | Carbon dioxide |
What is dynamite used for? | Dynamite is used to blast rock out of quarries, build roads through hills and knick down old buildings |
How do terrorists use explosives? | To kill or injure in crime |