Energy

Chapter 2 section 2

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Energy and Matter

• Energy- The ability to do work or cause change.

• Energy can be converted from one form to another.

• Ex. Light bulb

http://www.clean-energy-ideas.com/articles/pros_and_cons_of_solar_energy.html

http://www.energycrysis.com/energy-crisis/general-information/diagram-a-light-bulb

Energy and Matter

• Free energy- the energy in a system that is available for work.

• States of Matter– Solid– Liquid– Gas

• Which has more energy?

States of Matter

http://www.ilpi.com/msds/ref/vapor.html

Energy and Chemical Reactions

• Chemical reactions are represented by equations.• Reactants- Shown on left side of equation

• Products- Shown on right side of equation• Arrows point in which direction the equation or reaction

can occur

http://www.onimoto.com/p3-2.html

Balanced Chemical Equation

http://www.chem.ufl.edu/~itl/2045/lectures/lec_3.html

Energy and Chemical Reactions

• Exergonic Reactions- Chemical reactions that involve a net release of free energy.

http://www.emc.maricopa.edu/faculty/farabee/biobk/biobookenzym.html

Energy and Chemical Reactions

• Endergonic Reactions- Reactions that involve a net absorption of free energy

http://www.emc.maricopa.edu/faculty/farabee/biobk/biobookenzym.html

Energy and Chemical Reactions

• Activation Energy- The amount of energy needed to start a reaction

http://www.chem.ufl.edu/~itl/2045/lectures/lec_m.html

Energy and Chemical Reactions

• Catalysts- reduce the amount of activation energy needed for a reaction

• Enzymes- Class of catalysts in living things

http://www.scienceclarified.com/El-Ex/Enzyme.html

Reduction-Oxidation Reactions

• Redox reactions- reactions in which electrons are transferred between atoms

• Reduction Reactions- A reactant gains one or more electron; negative charge

• Oxidation Reactions- A reactant loses one or more electron; positive charge

Redox Reactions

http://www.gcsescience.com/a5-reaction-sodium-chlorine.htm

References• "Diagram A Lightbulb | EnergyCrysis." EnergyCrysis | Energy Resource. N.p., n.d. Web. 22 Sept. 2010.

<http://www.energycrysis.com/energy-crisis/general-information/diagram-a-light-bulb/>. • "Enzyme - body, used, water, process, life, plants, chemical, form, energy, reaction, animals, cells, parts, cause,

substance, plant, change." Science Clarified. N.p., n.d. Web. 22 Sept. 2010. <http://www.scienceclarified.com/El-Ex/Enzyme.html>.

• "GCSE SCIENCE CHEMISTRY HIGH SCHOOL - Sodium - Chlorine - Reaction - Ionic - Bond - Chloride - Ions - Bonding - gcsescience.com.." GCSE SCIENCE CHEMISTRY and PHYSICS - High School Science - gcsescience.com.. N.p., n.d. Web. 22 Sept. 2010. <http://www.gcsescience.com/a5-reaction-sodium-chlorine.htm>.

• "Pros And Cons Of Solar Energy." Natural & Renewable Energy Sources - Clean Energy Ideas. N.p., n.d. Web. 22 Sept. 2010. <http://www.clean-energy-ideas.com/articles/pros_and_cons_of_solar_energy.html>.

• "REACTIONS & ENZYMES." Estrella Mountain Community College. N.p., n.d. Web. 22 Sept. 2010. <http://www.emc.maricopa.edu/faculty/farabee/biobk/biobookenzym.html>.

• "Temperature Dependence of Rate." Chemistry Department - University of Florida. N.p., n.d. Web. 22 Sept. 2010. <http://www.chem.ufl.edu/~itl/2045/lectures/lec_m.html>.

• "The Chemical Equation." Chemistry Department - University of Florida. N.p., n.d. Web. 22 Sept. 2010. <http://www.chem.ufl.edu/~itl/2045/lectures/lec_3.html>.

• "The MSDS HyperGlossary: Vapor." Transferring you to the ILPI home page.... N.p., n.d. Web. 22 Sept. 2010. <http://www.ilpi.com/msds/ref/vapor.html>.

• "What Is Photosynthesis?." Onimoto.Com: Sharing Is Good. N.p., n.d. Web. 22 Sept. 2010. <http://www.onimoto.com/p3-2.html>.

• "Yellow Tang Moodle." Yellow Tang Moodle. N.p., n.d. Web. 21 Sept. 2010. <www.yellowtang.org/cells.php