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15 Cards in this Set

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  • Back
What is energy?
Capacity to preform work
What is Kinetic engery?
Energy in motion
What is Potential energy?
Stored energy due to an object’s relative position
What is Thermodynamics?
Study of energy
What is a Calorie?
Heat required to raise temperature of one gram of water one degree Celsius
Oxidation
occurs when an atom or molecule loses an electron.
Reduction
occurs when an atom or molecule gains an electron.
Redox
reactions occur because every electron that is lost by an atom through oxidation is gained by some other atom through reduction.
First Law of Thermodynamics
Energy cannot be created or destroyed, but only change form. During each conversion, some of the energy dissipates into the environment as heat. Heat is defined as the measure of the random motion of molecules.
Second Law of Thermodynamics
The disorder (entropy) in the universe is continuously increasing.Energy transformations proceed spontaneously to convert matter from a more ordered, less stable form, to a less ordered, more stable form.
Free energy
refers to the amount of energy actually available to break and subsequently form other chemical bonds.
Gibbs’ free energy (G)
change in free energy
G=H-TS
G = Gibbs Free Energy
H = Energy contained in bonds
S = Energy unavailable due to entropy
T = Absolute Temperature
Activation energy
refers to the extra energy required to destabilize existing chemical bonds and initiate a chemical reaction.
Factors Affecting Enzyme Activity
Temperature and pH
anabolism and catabolism
reactions that expend energy and
reactions that harvest energy
feedback inhibition
When the cell produces increasing quantities of a particular product, it automatically inhibits its ability to produce more.