IN All matter contains ____________ How do you explain the difference between endothermic and exothermic? Your body needs energy to function. Where do you get energy from? Where does digestion begin?

Through Part A You are what you eat OUT C-note

Reactions / Both reactions make and break bonds / Remember: / “Make Out” – When more bonds are made, energy goes OUT (exothermic). / “Break In” –When more bonds are broken, energy is absorbed INto the reaction (endothermic).

Exothermic Reaction / 2HCl + 2Mg2MgCl + H 2 Potential Energy Time  Magnesium and Hydrochloric acid  Energy comes from the surroundings  If a cold environment, then reaction would not happen

Endothermic Reaction / NH 4 NO 3 + H 2 O NH NO 3 - +H 2 0 Potential Energy Time  Ammonium nitrate and water  Needs a lot of activation energy

Endothermic Process Ice to water NOT an endothermic reaction BECAUSE no breakage or formation of chemical bonds. However, this is an endothermic process. Change in state (solid to liquid)

Questions 1. If an exothermic reaction releases heat, why is it inaccurate to say that an endothermic reaction releases cold? 2. What is the difference between kinectic energy and potential energy? Provide two examples of each to help with your explanation.(page 352)

You are what you eat Open your book to page 272 Read “Need to Know” box (quietly to yourself)

Notes on Background information Starch-energy storage made by plants, large molecule, broken down to extract energy Amylase-an enzyme found in human saliva Benedicts -indicator for sugars, blue Solutionto orange or red

Enzymes-proteins that speed up chemical reactions, can be affected by temperature, pH, time Glucose test -indicator for simple Stripssugars Iodine-indicator for starch

Maltose-sugar that results when starch is broken down by amylase Substrates-molecules to which enzymes bind

Do not write, just read In your mouth, you have spit factories called salivary glands. These glands make almost a liter of saliva everyday. Saliva helps to make your food wet and slippery, so it is easy to swallow. When you are chewing your food, saliva also makes a chemical reaction that will break down starch into sugar.

Animations of Enzymes and Digestion enzymes in action n.swf n.swf

DVD “Intro to Biosynthesis” Watch the DVD and take notes Think about “What happens when a foreign protein enters an animal?”

Protocol Now, design your own experiment. Complete an EDD for your experiment and get it approved by teacher. Possible variables?

Protocol Create a procedure for your experiment Make sure you test for starch and glucose using Iodine and Benedict’s solution. Get your procedure approved by teacher Apply your procedure and complete experiment You will be making a lab report for this experiment