Ocean Acidification Lab

Ocean Acidification Experimental Design Lab GP South AP Environmental Science Introduction: 1. Pre-Lab (Day 0) a. Fill a drinking cup ½ full with tap water. Measure the pH of the tap water and record. b. Use a straw to blow into the water at 30 second intervals until a pH change is observed. c. Discuss what you observed and write an equation to support the observations. d. Discuss 1 connection between this pre-lab and your coral reef practice FRQ. 2. Experimental Design- your group must design an experiment that tests how increasing acidity in water affects marine organisms. a. Materials: shells, cups, tap water, graduated cylinders, pipet, and an electronic balance. b. Timeline:  Day 1 of the lab will be your set-up  2-4 days later you’ll remove the shells to dry.  2-4 days later you’ll mass your shells. c. Write both an initial question your group will test and the testable hypothesis. The terms increasing or decreasing should be included. d. Describe your experiment below in detail, including: control group, 3-4 experimental groups, constants, dependent variable, independent variable, how mass/volume will be quantitatively used to test your hypothesis. 3. Lab Day 1: a. Run your approved experiment and follow the procedure as written. b. Label your cups according to their vinegar %. c. Be careful to not contaminate your cups as vinegar is a powerful acid. d. Rinse your pH probe under running water each time you measure a different cup. 4. Lab Day 2 (2-4 days later): Re-measure pH. Follow steps you’ve designed according to timeline. 5. Lab Day 3 (2-4 days later): Re-mass your shells as well as other quantitative and qualitative data. Group Members: ________________________________________________ 1. Write your initial problem (question to test) and hypothesis. Get approval before continuing. 2. Describe your experimental design below (what is in each cup) and have it approved. You must use at least 3-4 experimental groups and one control to test your hypothesis. 3. What are your constants (the things you keep the same for each cup/beaker)? 4. What is your dependent variable? ____________________Independent variable? _________________ Ocean Acidification Experimental Design Lab GP South AP Environmental Science Formal Lab Report: Should follow the APES guidelines including: Title: Descriptive to your group’s lab (1) I. II. III. IV. V. VI. VII. Introduction:  discussion of pre-lab observations…specific details (2)  reactants  products equation (1)  connection to coral reefs (2) Question (1) Hypothesis (1) Materials (1)…must use bulleted list Experimental Design: described (complete sentences) in detail, including:  your control group (1)  each experimental group (4)  independent variable (1)  dependent variable (1)  constants used to isolate your variable/eliminate error (2) Procedure (numbered, step-by-step, clear enough that someone else could follow w/o error) (3) Observations  Qualitative (complete descriptions, pictures are extremely useful here) (3)  Quantitative (MUST use data tables with titles) (3) Ocean Acidification Experimental Design Lab GP South AP Environmental Science Formal Lab Report: Should follow the APES guidelines including: Title: Descriptive to your group’s lab (1) I. II. III. IV. V. VI. VII. Introduction:  discussion of pre-lab observations…specific details (2)  reactants  products equation (1)  connection to coral reefs (2) Question (1) Hypothesis (1) Materials (1)…must use bulleted list Experimental Design: described (complete sentences) in detail, including:  your control group (1)  each experimental group (4)  independent variable (1)  dependent variable (1)  constants used to isolate your variable/eliminate error (2) Procedure (numbered, step-by-step, clear enough that someone else could follow w/o error) (3) Observations  Qualitative (complete descriptions, pictures are extremely useful here) (3)  Quantitative (MUST use data tables with titles) (3) Ocean Acidification Experimental Design Lab GP South AP Environmental Science VIII. Analysis  Discuss qualitative/quantitative results from controls and experimental groups (4) i. How did pH data change between days…explain the cause ii. How did mass data change bet ween days…explain the cause    IX. Calculations made from the data you collected (no set-up/work = no credit). (2) Graphs showing results of your data. Graphs must follow the APES format. (4) Error analysis: describe any real or possible errors that occurred. If no error occurred, explain why another group had error in their experimental design. (2)  Oceans as Carbon Sinks: Discuss specific ways that carbon emissions negatively affects shelled organisms/corals, and ultimately the oceans. Include basic chemistry. (3) Conclusion  Did your results help support or refute your hypothesis? (2) Grading Criteria Title & (Individual) Introduction/Pre-Lab Discussion (MUST not be copied from group…similar intros split points) Group Components: Question , Hypothesis, Materials, Exp. Design, Procedure, Observations Individual Components: (MUST be unique…similar analyses split points) Analysis : Qualitative/Quantitative, Calculations w/work, Graphs, Error Analysis, APES Connections w/ cites, Conclusion Total VIII. Possible Points 6 21 18 45 Analysis  Discuss the qualitative/quantitative results from controls and experimental groups (4) i. How did pH data change between days…explain the cause ii. How did mass data change bet ween days…explain the cause    IX. Calculations made from the data you collected (no set-up/work = no credit). (2) Graphs showing results of your data. Graphs must follow the APES format. (4) Error analysis: describe any real or possible errors that occurred. If no error occurred, explain why another group had error in their experimental design. (2)  Oceans as Carbon Sinks: Discuss specific ways that carbon emissions negatively affects shelled organisms/corals, and ultimately the oceans. Include basic chemistry. (4) Conclusion  Did your results help support or refute your hypothesis? (2) Grading Criteria Title & (Individual) Introduction/Pre-Lab Discussion (MUST not be copied from group…similar intros split points) Group Components: Question , Hypothesis, Materials, Exp. Design, Procedure, Observations Individual Components: (MUST be unique…similar analyses split points) Analysis : Qualitative/Quantitative, Calculations w/work, Graphs, Error Analysis, APES Connections w/ cites, Conclusion Total Possible Points 6 21 18 45