Organic Reactions and Enzymes

Chemical Reactions Changing of one set of chemicals into a new set of chemicals A chemical change Always involve the breaking of chemical bonds and/or the formation of new bonds Examples: CH4 + O2  CO2 + H2O (This is not balanced)   2H2 + O2 2H2O

Homework out for stamping: Warmup Read about nucleic acids on page 48. Create a concept map for that short section, following a similar style as the concept maps we made in class on Wednesday. Homework out for stamping: Questions from secton 2-3 Conclusions and Analysis questions for McMush lab

Announcements/Reminders Day to make up any missed/unfinished lab: Next Tuesday (9/22) Lab books due next Wednesday (9/23) Re-read course expectations AND SAFETY guidelines Pen/pencil? Spiral/lab notebook? Dividers Buddies Clean-up

record the results, and then throw the paper in the garbage. Finish McMush Check your lipid test, record the results, and then throw the paper in the garbage.

Energy in Reactions Reactions can release or absorb energy Reactions that release energy (exothermic)can occur spontaneously, however, many need Activation energy Activation energy is energy needed to get a reaction started

Energy in reactions cont. Chemical reactions that absorb energy (endothermic) generally need much activation energy

Enzymes Biological catalysts Catalysts; Speed up the reaction by lowering the activation energy.

Enzyme action Enzymes provide a place when the things that need to react can be brought together These reactants are know as substrates Enzymes literally provide a place where the reactants can “fit” When the reactions come in the enzyme changes shape and “works”

Homework Respond to the learning targets for unit one. Find the document on my website if you can’t find yours. My website: www.chambersbiology.weebly.com