TOPIC 4- EXTRACTING METALS AND EQUILIBRIA
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Micrometers in standard form
10^-6
Nanometers in standard form
10^-9
How big are nano particles
Range from 1-100nm and only contain a few hundred atoms
Why are nano particles used as catalysts?
Because they have large surface area in comparison to their volume
Example of a nanoparticle
Zinc oxide is used as sunscreen as it absorbs UV radiation while remaining transparent.
Advantages of nanoparticles
High surface area to volume ratio, catalytic
Disadvantages of nanoparticles
Long term effects are unknown, can enter our living cells, bad for environment
Metals reaction with acids tell you what about them
Their level of reactivity
Metal + acid»_space; ?
Salt + hydrogen
How does the reactivity affect the speed of the reaction
The more reactive the metal, the quicker the rate of reaction
How do you confirm hydrogen is released?
Squeaky pop test
Mg + 2HCl» ?
MgCl2 + H2
How do you speed up the rate of reaction ?
Heat or catalyst
Which metals react with water
K, Na, Li, Ca
Metal + water»_space; ?
Metal hydroxide + hydrogenk
Metal + steam»?
Metal oxide + hydrogen
Reactivity series in order from top
K, Na, Ca, Mg, Al, C, Zn, Fe, Sn, Pb, H, Cu, Ag, Au
What’s a redox reaction?
A reaction in which oxidation and reduction ocurr
How does the reactivity of a metal affect the temp in displacement
More reactive = more heat released
Define displacement
When a more reactive metal displaces a less reactive metal from its compound
Oxidation involving oxygen
When a substance gains oxygen
Reduction involving oxygen
When a substance loses oxygen
Oxidation with electrons
Loss of electrons
Reduction involving electrons
Gain of electrons