Ch 5 Chemical Changes Flashcards
What are ores
Rocks from which its economical to extract metal from
Most metals have been ….
Oxidised because oxygen have been added to the metal
To extract metal from their oxides…..
The metal oxide have to be reduced (have oxygen removed)
The reactivity of metals ….. going down in group one
Increase
What is displacement reaction
When a more reactive metal displaces a less reactive metal from its salt or solution
What does a ionic reaction do
Shows only that the ions and atoms that change in the reaction
Where is carbon put in the reactivity series
Between aluminium and zinc
What can half equations be used for
To show what happens to each reactant
When there is enough metal in a rock to make it worth extracting the metal, the rock is called….
A metal ore
Carbon is used to extract less reactive metals from oxides, why
As its a cheaper, newer more efficient way extracting metals
What other resource can be used to extract metals using reduction apart from carbon
Hydrogen
What is the general reaction of metals and acid
Metal + acid - a salt + hydrogen
What is oxidisation
Loss of electrons
What is reduction
Gain of electrons
What is a mass number
the total number of protons and neutrons in an atomic nucleus
