Energy for Life

Energy for Life - Energy for Life Energy is the capacity to...

Info iconThis preview shows pages 1–4. Sign up to view the full content.

View Full Document Right Arrow Icon
Energy for Life Energy is the capacity to work An objects total amount of energy is the sum of potential and kinetic energy. What is Energy Potential energy is the energy available to do work Kinetic energy is the energy of motion - Energy used to work Law of Thermodyna mics 1 st Law of thermodynamics- Energy cannot be created or destroyed. - Constant a mount of en ergy on e arth - Cannot be converted into different forms. 2 nd Law of Thermodynamics- energy trends to flow from high energy forms to low energy forms - No transfer is 100% - Always losing en ergy in form of heat Ex: what happens to food e at? - Chew – use en ergy - Digest- uses en ergy - Absorb Nutrients- we get en ergy - Every step loses energy as heat. Energy is lost as he at - Heat is disordered - All en ergy transfer he ad toward disorder Entropy- Measure of disorder or ………. Entropy of the universe is always increasing Luck for us, che mical bond resist spontaneous, direction of en ergy flow. - Ex: the bonds in our body hold us and our energy together. - The sun is constantly decreasing in en ergy as plants an animal absorb that energy
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Chemical Reaction Metabolism- biochemical reactions of the cell. Cells ability to acquire energy and use it to build, degrade, store, and release substance in controlled ways. Reactants or substances-Molecules that enter a reaction Products- molecules that remain at the end Endergonic Reactions Energy input required Product has more energy that starting substances Uses ATP Builds complex molecules from simpler ones Exergonic Reactions Energy is released Product have less energy than starting substances Make ATP Break large molecules into smaller ones Chemical Reactions Not all reactions are reversible reactions Not all reactions run from the reactions to products At chemical equilibrium, the energy in the reactants equals that in the products. Oxidation- Reduction reactions = Redox Cells gain energy by breaking down molecules in small steps. - Electrons = en ergy In one step molecules lose electrons = oxidized In another step other molecules gain those electrons = reduced Redox Reactions Electron transports chains – proteins passing electrons As one proteins gains electrons it is reduced
Background image of page 2
The reduced protein passes its electron and become = oxidized Each pass releases energy Cellular Energy All cells make ATP - Adenosine triphosphate = ATP ATP donates phosphate groups to other molecules – phosphoylotion - Enables the m to react - Accepts energy from exergonic reactions - Donates energy from exergonic reactions Why Don’t Reactions Spontaneously Take Place? Chemical Bonds often require a boost of energy in order to be broken
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 4
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 8

Energy for Life - Energy for Life Energy is the capacity to...

This preview shows document pages 1 - 4. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online