Topic 9a Flashcards
(24 cards)
Properties of metals
High melting and boiling point
Conduct when electrons are free to move
What metals react with water
Alkali metals
Metal + water
Salt + hydrogen
What metals react with dilute acid
Alkali metals
Metal + dilute acid
Salt + hydrogen
Electrolyte
Substances that give ions when dissolved in water
What determines the size of the voltage in a simple cell
How high it is in the electrochemical series
What is the purpose of an ion bridge
To complete the curcuit
Direction of electron flow in a cell
It goes from the more reactive to the less reactive element
Reaction contains metal and metal ion in solution
Displacement reaction
Displacement reaction
chemical reaction in which a more reactive element displaces a less reactive element from its compound
Spectator ion
Elect that appears both side of an equation
Oxidation
Loss of electrons
Gain of oxegen
redeuction
gain of electrons
Loss of oxegen
Redox reaction
When oxidation and reduction take place
Electrode
electrical conductor
Hydrogen test
Reactive metal + water —-> metal hydroxides + hydrogen
Why do electrons flow in a cell
Difference of reactivity between 2 metals
When graphite is an electrode what direction do electrons flow
From graphite to the metal
Electrolysis
Breaking up of an ionic compounds using electricity
What happens to the positive electrode
Bubbles with gas
Eg ie if copper chloride was the electrolyte, then the gas produced would be chlorine
What happens to the negative electrode
Solid forms
Eg copper chloride. Then copper solid would form
Electron in equation of diatomics
2
What can be used in a half-cell
Graphite electrode
