Survey
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
ACTIVE CHEMISTRY – COOL CHEMISTRY SHOW– CHAPTER 6 Key Concept: When a chemical change occurs, new substances are produced by recombining the atoms in a former substance. ACTIVITY 2 – MORE CHEMICAL CHANGES Assessment Objectives: Evidence can be used to determine whether a chemical change has occurred (for example: color change, generation of a gas, formation of a precipitate, energy transfer, use of indicators). (2.3.a) 1. Double replacement reactions in well plates: Materials Amount per class (8 groups) 24 well plate 8 0.1 M Sodium hydroxide 100 mL 0.1 M Copper (II) sulfate 100 mL 0.1 M hydrochloric acid 100 mL 0.1 M iron (III) nitrate 50 mL 0.1 M barium nitrate 50 mL 0.1 M sodium hydrogen carbonate 50 mL 0.1 M potassium iodide 50 mL 0.1 M silver nitrate 50 mL Clear plastic dropper bottles 48 Brown glass dropper bottles 8 Prep hint: The solutions above will be used again in later experiments. It saves time to label and fill the dropper bottles now as they can be used in future activities. The lab can also be done as a microscale lab, eliminating the need to collect the waste and dispose of it later. Chemical disposal: Collect contents of 24 well plates in tray and then store in labeled waste container. Contact Joni Rix for disposal when container is full. 2. Ziploc bag experiment Materials Amount per group Quart size resealable bag 1 Calcium chloride 1 small scoop Baking soda 1 small scoop Phenol red 10 mL Scoopula 2 50 mL graduated cylinder 1 Chemical Disposal: Contents of the resealable bag can be rinsed down the sink with an excess of water. 3. Limewater experiment Materials Amount per group 250 mL erlynmeyer flask 1 Calcium hydroxide solution (limewater) 100 mL Soda straw 1 Chemical disposal: Limewater – collect in a labeled waste container and contact DPS for collection when container is full. Alternately, the solution can be diluted to a final concentration of 1M, neutralized to a pH of 5-9 by the addition of 3M hydrochloric acid, and then flushed down the drain with a 20-fold excess of water. Teacher Notes Materials/Set up notes: Group size: _______ students per group because Estimated time in class for this activity 1) Double replacement reactions 2) Ziploc bag experiment 3) Limewater experiment Essential Understanding from the activity: Homework: Embedded assessments: Investigate Checking Up Chem To Go #3a-g, 4c, 5a #2-6 #1-3 Key Vocabulary: indicator chemical test