Top 4 - Chemical Changes Flashcards
What is a Base?
A substance with a pH that is great than 7 (an alkali)
Give the general word equation for the reaction between an acid and a base.
Acid + Base –> Salt + Water
What is the main things that happens to a strong acid when in an aqueous solution?
The acids ionises and they produce (protons) hydrogen ions.
One H+ ion is just a proton
What is a strong acid?
An acid that ionises completely in water
All particle dissociate to release H+ ions.
Give three Examples on strong acids and then three of weak acids.
Sulphuric Acid
Hydrochloric Acid
Nitric Acids
Ethanoic Acid
Citric Acid
Carbonic Acid
What is the general words equation for the reaction of a metal with an acid?
Acid + Metal –> Salt + Hydrogen
What is the general words equation for the reaction of a metal with water?
Water + Metal –> Metal Hydroxide + Hydrogen
What products from in the reaction of magnesium and oxygen?
2 Moles of Magnesium Oxide
Define Oxidisation and Reduction?
Oxidisation is the losing of electrons
Reduction is the gaining of electrons
In a displacement reaction does the metal atom get oxidised or reduced?
The metal atom always loses electrons
It is oxidised
Define electrolysis.
Electrolysis is the separation of atoms from naturally occurring sources of materials using electricity.
Which electrode is the negative one?
Cathode
Why can ionic solids not undergo electrolysis?
Because inside an ionic solid the ions are in fixed positions and can’t move
True or False? Reactants must be in either a molten, liquid or aqueous state before electrolysis can take place?
True
What is the liquid substance already in the tub that the electrolysis takes part in?
The Electrolyte
