chem - metals Flashcards
what is the main use for iron and why?
in construction as it is strong and cheap
what is the main use for aluminium and why,
pilon wires - as it has a good conductor of electricity, and a low density
what does aluminium bring a good conductor of heat mean it can be used to make?
can make saucepans
why is aluminium also a good material to make saucepans
doesn’t react with food cause of protective layer of aluminium oxide on surface - layer means u can also make window frames with it due to lack of corrosion
what 3 things is copper used for and why (2 different reasons)
electrical wires - excellent conductor
hot water pipes and boilers - unreactive
why are gold and copper used to make jewellery?
unreactive and have an attractive appearance - im comparison to metals that are dull or who react and lose their shine
metals are used in construction because of what property?
they’re strong
metals are used in car body panels (made out of sheet steel) because of what property?
they’re malleable
metals are used in the moving part of engines because of what property?
they’re strong
metals are used in electrical wiring because of what property?
they are ductile and excellent conductors of electricity
metals are used as heat sinks to cool microprocessors and stop them overheating because of what property?
they are good conductors of heat
what happens to copper when it burns (in oxygen)
turns black slowly - as it is covered with a layer of black copper oxide
what happens to magnesium when it burns (in oxygen)
a white solid is formed (MgO), and it burns with a bright WHITE flame
what happens to calcium when it burns (in oxygen)
white solid formed -(CaO), burns with a bright RED flame
what happens to zinc powder when it burns (in oxygen)
white ZnO is formed, and it burns with a BLUEISH flame
what happens to iron filings when it burns (in oxygen)
brown solid - Fe2O3 is formed, and they burn with a YELLOW/ORANGE flame
what happens to potassium when it burns (in oxygen)
a white solid - K2O is formed, burns with a LILAC flame
what happens to copper when it is reacted with hydrochloric acid
no reaction
what happens to magnesium when it is reacted with hydrochloric acid
gets warm and there’s effervescence
what happens to calcium when it is reacted with hydrochloric acid (3 things)
smoking, heat and effervescence
zinc had no reaction but iron did (there were some bubbles) - yet zinc is more reactive - why is this?
because it was powdered iron so greater SA : Vol ratio and more collisions, so if it had been powdered zinc it would have reacted more strongly
what happens to potassium when it is reacted with hydrochloric acid
explosive reaction
How do tin, lead and copper react with oxygen?
react slowly - forming a layer of oxide
how do silver, gold and platinum react with oxygen?
they don’t react