Electrolysis Flashcards
Electrolysis
Technique that uses a direct electric current (DC) to drive an otherwise non-spontaneous chemical reaction.
Current used in electrolysis What type of compounds? decomposes what What occurs in electrolysis? Electrolysis drives an
Direct Ionic ionic compounds Oxidation Chemical reaction
What is a compound?
chemical substance composed of many identical molecules (or molecular entities) composed of atoms from more than one element held together by chemical bonds.
What is the Anode?
What is the cathode?
Positive electrode
Negative electrode
What is oxidation?
What is reduction?
The loss of electrons
The gain of electrons
What is the cation ion ?
Positive ion
What is the anion ion?
Negative ion
What occurs at the cathode?
Reduction
What occurs at the anode?
Oxidation
What is inert?
Unreactive
What is the chemical test for oxygen?
+Use a glowing splint
+You can test for oxygen by checking if the gas will relight a glowing splint
What is the chemical test for hydrogen?
Hydrogen makes a ?
The noise comes from the ?
Splint test
“squeaky pop” with a lighted splint.
hydrogen burning with the oxygen in the air to form water.
What is the test for carbon dioxide?
colour turns?
+Bubbling the gas through limewater
+If it is carbon dioxide, the limewater will turn cloudy
voltage that is needed for electrolysis to occur is called the
decomposition potential.
Cation attracted to
attracted to the cathode
Anion attracted to
attracted to the anode
Process
An electric current is passed through an electrolyte (a molten or dissolved ionic compound), causing it to decompose.
electrolyte
substance that produces an electrically conducting solution when dissolved in a polar solvent, such as water
What do the positive ions (cations) in the electrolyte do move towards?
the cathode
What are half equations?
They show how electrons are transferred during reactions
