metals. Flashcards
what are ores?
type of rock where it is economic to extract the metal from
how are high reactivity metals generally extracted from compounds and ores?
Electrolysis of metal compound, solution or molten
how are lower reactivity metals generally extracted from compounds in ores?
Displacement, heating with carbon
describe the structure of metals
Positive metal ions surrounded by sea of delocalised electrons
Why do metals conduct electricity?
Did electrons carry charge which move through the structure
Why do metals have high melting points?
Strong forces of attraction between ions and electrons, which take a lot of energy to overcome
Why are metals, soft and malleable?
Layers slide over each other
what is an alloy?
Mixture of metals with small amount of other elements
why are harder than pure metals?
Layers can start every each other so easily as atoms are different sizes
What is the rating for pure gold?
24 carat
what’s wrong with pure gold?
Too soft
What is the main metal in steel? What other elements are there and what are the uses of it?
Iron carbon and something else and is using cars or stainless steel
what is the main metal of a gold alloy what other elements are in there and what are the uses?
Gold, silver, copper and zinc, jewellery
What is the main metal in brass what other metals are there in brass and what are the uses?
Copper, zinc, killed bacteria, door knobs
What is the main metal in bronze what other elements are there and what is the uses?
Copper, tin, statues, medals
