Chemical Changes and Electrolysis Flashcards
Metals react with oxygen to produce …
Metal oxides
Oxidation reactions means metals gain …
Oxygen
Oxidation reactions means electrons are …
Lost
Reduction reactions means metals lose …
Oxygen
Reduction reactions means electrons are …
Gained
Order the reactivity series
Potassium
Sodium
Lithium
Calcium
Magnesium
Aluminium
Carbon
Zinc
Iron
Hydrogen
Copper
Silver
Gold
Metals less reactive than —— can be extracted from their oxides by ——— with carbon
Carbon
Reduction
If magnesium was added to copper sulphate solution, what metal would be oxidised
Magnesium
What is a redox reaction?
A reaction where both oxidation and reduction occur
What type of reaction is a displacement reaction?
Redox reaction
Metal + Acid —>
Salt + Hydrogen
Acid + Alkali —>
Salt + Water
Hydrochloric acid will produce
Nitric acid will produce
Sulfuric acid will produce
Chlorides
Nitrates
Sulfates
What ions do acids produce?
Hydrogen (H+)
Hydrogen ions + Hydroxide ions —>
H+ + OH- —>
Water
H2O
Titration is the process of …
Determining the concentration of an unknown solution
A strong acid is completely ——- in aqueous solutions
Ionised
A weak acid is only ——— ionised in aqueous solutions
Partially
When an ionic compound is melted or dissolved in water, the ions are …
These solutions are able to conduct electricity and are called …
Free to move about within the liquid or solution
Electrolytes
When you pass a current through electrolytes, the —- move to the ———-
Ions
Cathodes
Positive ions move to the …
Cathode
Negative ions move to the …
Anode
Electrolysis is using electricity to …
Break down electrolytes to form elements
At the cathode, positive ions —- electrons
Gain
At the anode, negative ions —- electrons
Lose
An electrode is typically made of …
Graphite
At the cathode - if the metal is more reactive than hydrogen - what is produced?
Hydrogen
What is produced at the anode?
Oxygen
