Intro to Atoms, Elements, and Compounds You will need: Instructions: Follow along in the steps below (pictures and examples provided on - Tooth picks final page) and with the Chemical Oceanography Video. We will be using food/play - 5 different fruits, candies, or any food item dough to represent different elements and molecules we find in our ocean. Each that can be poked with a toothpick (edible step will represent a different chemical process that takes place in the ocean. We version) will be breaking and combining different elements with our toothpicks (bonds). - OR 5 different colors of play dough 1.) Define each term below: Chemical Bond: _____________________________________________________________________________________________ Atom: ______________________________________________________________________________________________________ Element: ___________________________________________________________________________________________________ Compound:___________________________________________________________________________________________________ 2.) On this sheet of paper label what edible item or play dough color you would like each element to represent. Pick anything you would like as long as it can be connected to a toothpick: Hydrogren: ________________________________ Carbon: ____________________________________ Oxygen:___________________________________ Sodium (Na+) :______________________________ Calcium: _______________________________________ 3.) First make the two compounds we find most often in ocean water. With your toothpicks and designated items for Sodium, Chlorine, Hydrogen, and Oxygen, make a water compound and salt (H2O and NaCl). Intro to Atoms, Elements, and Compounds 4.) a. Now, take this a step further and step up our compounds that are involved in ocean acidification. You will first need to make a water and carbon dioxide compound (H20 and CO2). b. Now it is time to break our bonds. As CO2 and H2O react with one another and form carbonic acid. Begin to break your CO2 and H20 bonds and create H2CO3 with your materials. c. Next, the carbonic acid breaks down even further. Our H2CO3 breaks down into HCO3 (bicarbonate) and H+ (our acid) 5.) What happens to our marine life and our ocean when our compounds break down and becomes more acidic? 6.) Did the pH of the ocean go up or down when we added more CO2 to our ocean? 7.) At the end of the activity, which of your food items or play dough colors represented an acid? Intro to Atoms, Elements, and Compounds Example: 1.) Ocean Water Intro to Atoms, Elements, and Compounds 2.) CO2 + H20 ————> H2CO3 Intro to Atoms, Elements, and Compounds 3.) H2CO3 ————-> HCO3- and H+ .