electrochem

Question 1

half cells

Answer 1

compartments of a galvanic cell, including electrons

Question 2

electrodes

Answer 2

conducting substance that electrons can enter or leave

Question 3

anode

Answer 3

negative electrode

where oxidation takes place

source of electrons and is the negative terminal of the galvanic cell

Question 4

cathode

Answer 4

postive electrode

where reduction takes place

receives electrons and is the positive terminal on the galvanic cell

Question 5

electrolyte

Answer 5

ionic compound that conducts electricity when its dissolved in water

Question 6

wire

Answer 6

connects the anode and the cathode together

lets the electrons flow from the ANODE to the CATHODE in an external circuit

Question 7

salt bridge

Answer 7

prevents the build up of a POSITIVE CHARGE in the OXIDATION HALF REACTION

prevents the build up of a NEGATIVE CHARGE in the REDUCTION HALF REACTION
keeps each half cell neutral

Question 8

voltmeter

Answer 8

measures the amount of electricity produced

Question 9

chemical analysis

Answer 9

electrochemical analysis and redox reactions are used in chemical analysis

glucose sensors used by diabetics and breathalyzers are based on redox reactions

Question 10

electroplating and metal purification

Answer 10

when corrosion resistant metal coating is applied to a metal object

done by making the metal object the cathode of an electrochemical cell,

Question 11

electrochemical process ex 1

Answer 11

electrochemical processes are used to produce aluminum metal from its mineral ore AI2O3

Question 12

electrochemical process ex 3

Answer 12

electricity is used in an electrochemical process called the chlor-akali process

produces hydrogen and chlorine gasses + hydroxide from chlorine and water

used to produce industrial and commercial products

Question 13

batteries

Answer 13

can produce electricity from chemical reactions

Question 14

electrical cells and batteries

Answer 14

batteries has 2 or more galvanic cells connected together to increase the amt of electricity produced

Question 15

primary cells (dry cells)

Answer 15

disposable batteries

common types are
- zinc chloride
- alkaline dry cells used in flashlights, watches, kids toys

irreversible redox reaction, when that reactants are used up the battery cant produce electricity anymore

Question 16

secondary cells

Answer 16

rechargeable batteries absed on reversible redox reactions

can be recharged by using an external source of electricity

recharges the battery by reversing the reaction

Question 17

fuel cells

Answer 17

doesnt have a limited amount of reactants

similar to filling a gas tank

fuel cell reactants flows continuously into the cell from an external source

Question 18

ways to prevent corrosion

Answer 18

avoid mechanical stress

coating, coating a metal with paint to prevent it from reacting w air

making metal alloy, adding another metal to metal alloy, adding chromium to the metal alloy formed steel forms stainless steel

galvanizing, coating a metal with a more reactive metal (eg coating metal with zinc)

Question 19

ways to prevent corrosion c1

Answer 19

cathodic protection, turning a potential anode into a cathode

sacrificial anode- more reactive metal like zinc id attached to the surface of a diff metal like iron, iron becomes the cathode instead of anode

Question 20

ways to prevent corrosion c2

Answer 20

impressed current- forcing current to a potential anode like iron so that it becomes a cathode

used to prevent corrosion of piplines