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7F
Revistion
| Question | Answer |
|---|---|
| Meaning of reactants | Two chemicals or objects that react with one another to form something different. |
| Magnesium + Oxygen --> | Magneisium Oxide |
| Methane + O2 --> | carbon dioxide + water |
| fuel + O2 --> | CO2 + water |
| methane + O2 --> | carbon monoxide + water |
| What is the limewater test? | A test in which you put a gas through limewater, if it goes foggy it means that it is O2, if it doesnt it is CO2 |
| What are the 3 sides of the fire triangle? | O2, heat and fuel |
| Why is CO2 used in fire extinguishers? | because CO2 floats down and puts out fires easily |
| What is a 'fire break'? | something that blocks a fire from spreading |
| What side of the fire triangle is taken away in a fire break? | Fuel |
| What is dry ice made of? and how cold does it have to get? | Carbon Dioxide, -80degrees celcius |
| What happens to metals when left to react with air and water? | Rust forms and it starts to corrode. |
| What 2 things are formed when starch is heated? | Water vapour and CO2 |
| T/F Fireworks are NOT a chemical rection. | False. They are. |
| What happens when a barely lit splint is put into a jar of O2? | It ignites furiously |
| What happens when a splint is put into a jar of CO2? | It gets put out. |
| What happpens when you put a lit splint into a jar of Hydrogyen? | It makes a popping sound. |
| What happens when Magneisium is put over a flame? | It goes white and brightens. |
| Give 4 examples of fuel | Petrol, Wood, O2, coal, nateral gasses, oil are all acceptable. |
| Explain why a candle, when put in a glass that is turned upside down, gets put out after a while. | Because the candle is burning O2 and releasing CO2 causing it to run out of O2 in which it will take a side of the fire triangle out. |
| Explain useful use for explosives. | Tearing down houses easily, shows, fireworks. |
| What is CO2 best for putting out? | electrical fires |
| What is H2O best for putting out? | wood fires, paper fires, cloth fires |
| what is foam (AFFF) best for putting out? | Wood fires, paper fires, Petrol fires, solvents, paints, platic fires. |
| What is dry powder best for putting out? | fires involving metals or electical fires. |
| What is a hydrocarbon? | Any chamical with only carbon and hydrogyen |
| Give an example of a hydrocarbon | Diesel |
| T/F Nitrolycerine is unstable | True |
| T/F Oil lights fire easily | True |
| T/F Explosives are always bad. | False |
| T/F Dynamite can be used in a good way to blow up buildings | True |
| T/F there is absoluetly NO way to detect Carbon Monoxide | False. There are Carbon Monoxide detecters now. |
| T/F Fireworks have a source of O2 wixed with the fuel | True |
| T/F Carbon Monoxide is deadly | True |
| T/F Carbon Monoxide tastes like freshly dead fish | False. It has no flavour. |
| T/F People can always tell that they've been poisoned with Carbon Monoxide because of the smell and taste of it is unbearable | False. People never know. |
| Why was it easy for the Buncefeild oil depot to catch fire? | Because it had a lot of oil in it which ignights easily. |
| A chemical reaction becaomes an explosion when... | A large amount of gas is formed A lot of heat is released Plenty of o2 is available |
Created by:
khetherington
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