Exam 2: Chapter 4,6,7 (Mostly 7) Flashcards
What is current?
- charge / time
I = dQ / dt
What is charge measured in?
coulombs - 1 C = 6.24x10^18 charges
What is current measured in?
Amperes (1A = 1C / 1s)
What is work (electrochemistry)?
One Joule of work is required to raise the electric potential energy of one Coulomb of charge by an electric potential of one Volt
V = W / Q
What is ohms law?
V = RI
What is Joule’s Law?
P = (I^2)(R)
What is power?
Work per unit time
Oxidation is the process that occurs when…
- oxidation number of an element increases
- compound adds oxygen
- compound loses hydrogen
Reduction is the process that occurs when…
- oxidation number of an element decreases
- compound loses oxygen
- compound gains hydrogen
What does oxidation state reflect?
reflects the extent of electron transfer in bonding
How is the oxidation state determined?
- determined by comparing the number of electrons in a lewis structure assigned to an atom with the number of electrons on the free atom
How are electrons split in different bonds?
- in a covalent bond both electrons are assigned to the more electronegative atom
- in a homonuclear bond the electrons are split evenly between the two atoms
What are the rules for assigning oxidation states?
What are non-metal oxidation states?
What is a reducing agent?
- the reactant that reduces another reactant
- the reducing agent contains the element that gets oxidized