Metals Flashcards
what is the chemical formula for limestone
CaCO3
what is the balanced equation for the thermal decomposition of limestone into quicklime and carbon dioxide
calcium carbonate heat = calcium oxide + carbon dioxide
What would you see when sulphur burns with oxygen
it burns with a very nice blue flame
What is the symbol equation for when sulphur burns with oxygen
S(s) + O2(g) ——> SO2(g)
what type of oxide is so2
sulphur dioxide
what is meant by the term amphoteric
It is a substance that can act as either an acid or a base
what type of oxide is Mg0
Magnesium oxide
define an ore
Ores are naturally occurring rocks that contain metal or metal compounds in sufficient amounts to make it worthwhile extracting them.
what do you see when potassium reacts with water
A fire
lithium is less reactive than potassium, how would your observations differ
lithium floats and fizzes
Calcium reacts with water with lots of fizzing and turns universal indicator blue. what does this show ?
That its an alkali
under what condition does magnesium react with water?
At high temperatures
when magnesium is added to copper sulphate
the copper sulphate will turn colourless to a magnesium sulphate solution and form a reddish brown copper powder.
What is the word equation for copper sulfate and magnesium
Copper II sulfate (aq) + Magnesium(s) –> Magnesium sulfate (aq) + Copper (s)
what is the balanced symbol equation for iron and carbon
2FE203 + 3C > 4Fe + 3CO2
Why is pure iron soft
This is because the atoms of pure iron are arranged in a standard manner
What is an alloy
a metal made by combining two or more metallic elements
Why Is Steel Better Than Iron?
Steel is better than iron because it is durable, strong, stable and it is also environmentally friendly
What is meant by a shape memory alloy
a shape-memory alloy is an alloy that remembers its original shape: returning to the pre-deformed shape when heated
What Are the Uses of Smart Alloys?
smart alloys are used in aircrafts to reduce the aircraft’s engine noise
2 properties of transition metals
they form coloured compounds
they are good conductors of heat and electricity
Why are new ways of mining copper being developed
because We are running out of ores rich in copper.
why is aluminium extraction very expensive
because of the amount of electricity used up in the extraction process.
what is the test for the presence of oxygen
rags
define oxidation and reduction in terms of oxygen
Oxidation is gain of oxygen.
Reduction is loss of oxygen.
what is necessary for iron to rust
Iron must react with oxygen
