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science 7F

flash cards

QuestionAnswer
What is a chemical reaction? When chemicals join or break apart from each other.
what is the name when magnesium reacts with oxygen magnesium oxide
What happens when there is a chemical reaction takes place? A new substance is formed
What happens when a lit splint is placed into a jar with oxygen? The light gets brighter
What are the 3 things a fire needs to keep burning? fuel, oxygen, heat
what is the only way to take out a fire? Take away 1 of the 3 things away
What is a physical reaction? is when the reaction is reversible
What 2 fire extinguishers would you use on a wood fire? Water and foam
What does fuel + oxygen create? carbon dioxide + water
In water and ice a physical or chemical reaction? Physical reaction
What is the meaning of decompose? When 1 substance splits up into 2 or more products
At what temperature does carbon dioxide turn into dry ice? -80C
What is the meaning of corrosive? Can eat through living tissue
Can water rust steel cars over time? yes it can
What turns rain into a weak acid? The carbon dioxide in the air
What does carbon dioxide turn lime water when mixing? turns the lime water milky
What is the meaning of irreversible? Things you can not change back to its original form
What is the meaning of reversible? Things you can change back to its original form
What is formed when magnesium is put on fire? it will be bright and create white ash
What is the percentage of the amount of oxygen inside air? 20%
What is gunpowder used in? fireworks and special effects in movies
What can happen when you use the wrong type of fire extinguisher on the wrong type of fire? it can spread the fire
What does methane + oxygen create? carbon dioxide and water
What is wax used for? to burn candles
Is nitroglycerine unstable? Yes
what is oxide? A component containing oxygen
What is a fuel,Give four examples? Wood, Coal, oil and petrol
What 3 factors make an explosion? A large amount of gas is formed, a lot of heat is released, plenty of oxygen is available
Created by: nkruimer
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