Chapter C5 Chemical Changes Flashcards
What are ores?
Rocks from which it is economical to extract metals that they contain
What does oxidised mean?
A substance that has had oxygen added to it
What are ores commonly chemically bonded to?
Oxygen from the air
Toe extract metals what must you do?
Reduce the metal oxide- have oxygen removed
Name the order of the reactivity series?
Potassium Sodium Lithium Calcium Magnesium Aluminium Carbon Zinc Iron Tin Lead Hydrogen Copper Silver Gold
What is the reactivity series?
A list of metals in order of their reactivity
Which metals fizz (give off hydrogen gas) when reacting with water?
Potassium
Sodium
Lithium
Calcium
What is fizzing?
Release of hydrogen gas
What happens when the most reactive metals react with water?
Fizz
Leave an alkaline solution of metal hydroxide
Which metals explode when reacting in dilute acid?
Potassium
Sodium
Lithium
Which metals have a very slow reaction with water?
Magnesium
Aluminium
Zinc
Iron
What requirement does aluminium have to meet before it reacts?
The oxygen must be removed
Which metals fizz when put in dilute acid?
Calcium Magnesium Aluminium Zinc Iron
What happens when C M A Z I react with dilute acid?
Fizz, release hydrogen gas
Form a salt
Which metals have a slight reaction with steam?
Tin lead
Which metals react slowly with warm acid?
Tin
Lead
Which metals do not react with water even when steam is present?
Copper
Silver
Gold
Which metals do not react with dilute acid?
Copper
Silver
Gold
What happens when a more reactive metal displaces a less reactive one?
Forms an aqueous solution of one of its salts
Give an example of a displacement equation
Magnesium + copper sulfate —>
Magnesium sulfate +copper
Define oxidation
Loss of electrons
Loss of oxygen
Define reduction
Gain of electrons
Where are metals found?
The earths crust
What is a metal ore?
When there is enough metal in a rock to make it worth extracting the metal