Chapter 2 Flashcards
chemistry
corrosion
the deterioration of a material, usually a metal that results from a reaction with the envirionment
Electrically charged atoms are referred to as ____.
ions
Anions are _____ charged ions.
negatively
_______ are positively charge ions.
cations
Between PH’s _____ to _____ corrosion rate is fairly independent of PH.
For some metals such as steel the rate of corrosion increases below _____.
Above ______ the corrosion rate decreases.
4 to 8
For some metals such as steel the rate of corrosion increases below 4.
Above 8 the corrosion rate decreases.
Metals that corrode under high and low PH conditions are called
amphoteric metals
Define oxidation reaction
occurs when electrons are given up by an atom or electron
Increases positive charge
A _________ reaction occurs when electrons are gained by an atom or molecule
reduction
Electrolytes with higher ionization will have ______
conductivity.
higher
Define electrolyte
A solution containing dissolved chemical compounds
that dissociate into positive and negative ions
What kind of reaction occurs at the Anode?
What kind of reaction occurs at the cathode?
oxidation occurs at the anode
reduction occurs at the cathode
_________ Allows electrons to flow from anode to cathode.
external metallic path
________ charged ions move toward the anode and ______ charged ions move towards the cathode.
Positively charged ions move away from the anode and toward the cathode.
Negatively charged ions move away from the cathode towards the anode.
_______ current flows in the direction of the of the positive ion transfer.
conventional current
Electrons flow
Electrons always flow from the anode to the cathode or from the oxidation half cell to the reduction half
