Booklet 4 - Reactivity Of Metals Flashcards
What are the metals that react with water?
Potassium, sodium, lithium, calcium
Which metals reacts with acids?
Potassium, sodium, lithium, calcium, magnesium, zinc, iron, tin, lead
Which metals react with oxygen?
Potassium, sodium, lithium, calcium, magnesium, aluminium, zinc, iron, tin, lead, copper, mercury, silver
What does the reactivity of a metal depend on?
Depends on how easily it loses an electron to form a positive ion, it is called a cation
What is the word to descibe a metal that is more able to lose electrons and become a positive ion?
They are more reactive
What do metals that react with oxygen make?
What is the general equation for this?
Metal oxides
Metal + oxygen-> metal oxide
What is the equation for sodium and copper reacting with oxygen? What are they examples of?
Sodium + oxygen -> sodium oxide
4 Na + O2 -> 2NaO
Copper + oxygen -> copper oxide
2Cu + O2 -> 2CuO
Oxidation
Which metals react with dilute acids?
Anything more reactive than hydrogen
Which metals react with cold water?
Anything above magnesium
What is a displacement reaction?
It is when a more reactive metal will take the place (displace) a less reactive metal in a conpound.
Basically a battle between two metals to get rid of electrons
What type of metals are gold and silver and where are they found?
Unreactive metals
Found in the earth
What are most metals found as? What do they require to extract the metal?
Found as metal compounds, require chemical reactions to extract
What can metals less reactive than carbon be extracted by?
Extracted from their oxides by reduction with carbon
What is the equation for the reduction of iron ore by carbon?
What has happened?
Iron oxide + carbon -> iron + carbon dioxide
Fe2O3 + 3C -> 2Fe + 3
The carbon removes the oxygen from iron oxide, hence carbon has reduced the iron oxide
What is Oxidation?
A reaction where a substance gains oxygen or as a reaction where a substance loses electrons
What is reduction?
Loss of oxygen or gain of electrons
What is OILRIG?
Oxidation Is Loss, Reduction Is Gain
When can oxidation also occur? What does the metel need?
It can occur when there is no oxygen in the reaction, it only needs electrons to lose to undergo oxidation
What are redox reactions?
Where oxidation and reduction both occur
What happens to the ions of the less reactive metal?
They gain electrons and become REDUCED
What happens to the atoms of the more reactive metal?
They lose electrons and become OXIDISED
What does the pH scale do? What does it run from and to?
Shows how acidic or alkaline a solution is. Runs from 1-14
What does the Universal Indicator do? What colour is it in acid, alkali and neutral?
It shows the pHs of different substances.
Red in acid
Blue in alkali
Green when neutral
What can also give us a pH value?
A pH probe can give an electric value for pH often to 2 decimal places
What do acids produce?
Hydrogen ions, H+
What do aqueous solutions of alkalis contain?
Hydroxide ions, OH-
When neutralisation occurs write the equation for when the two ions combine to make water?
H+(aq) + OH-(aq) -> H2O(l)
What is a salt?
An ionic compound made from any metal and and non metal
The acid with metal hydroxides are neutralisation reactions. What reacts with what?
The H+ of the acid reacts with the OH- of the alkali.
H+ + OH- —> H2O
The acid with metal hydroxies or metal oxides are neutralisation reactions? What reacts with what?
The H+ of the acid reacts with the O2- of the base.
What happens when some metals are too UNreactive and some are too REACTIVE?
They will react with the water that the acid dissolved in as well the acid itself.
Why is it useful to know the reactivity of carbon even though its not in the reactivity series?
It is often used to displace metals that are lower than it in the series, from their metal oxides