1. Write date, topic and purpose in notebook. 2. Answer in your notebook: What are two signs that a chemical reaction is happening?
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1 Warm Up (5 min) Date: Monday, 1/4/16 Topic: Alka Seltzer Lab Purpose: To assess the Law of Conservation of Mass by designing an experiment to determine mass before and after a chemical reaction. 1. Write date, topic and purpose in notebook. 2. Answer in your notebook: What are two signs that a chemical reaction is happening? Nov 15 3:48 PM Quality Review Visitors from the Department of Education Looking for: What we do at IS5 Leadership/7 Habits Notebooks/Folders What you should do: If they talk to you, talk to them! Do what you normally do in class Tell them about what we are learning in class Be on your best behavior Jan 4 7:23 AM 1
2 Folder Prep Everyone must have a folder! Tests, labs, all self reflections completed Jan 4 8:00 AM Demonstration: What happens when the alka seltzer is placed in water? Write down observations. Be descriptive! Initial Observation: "Some matter disappears in a chemical change." Oct 29 7:26 AM 2
3 Research: The Law of Conservation of Mass (click link for BRAINPOP video) Oct 29 7:35 AM Important terms: Reactants > Chemical Reaction > Products Chemical Reaction: Reactants: substances that take part in and undergo changes during a reaction. (Chemical Change) the processes by which chemicals interact to form new chemicals with different compositions. Products: substances that form as the result of a chemical reaction. Oct 29 7:19 AM 3
4 Problem: How does a chemical change affect the mass of the products (g) of an alka seltzer tablet and water reaction? IV: DV: chemical change mass (g) Oct 29 7:38 AM Background Information Alka Seltzer is a medical drug that works as a pain reliever and an antacid (antacids help neutralize stomach acidity e.g., heartburn). The pain reliever used is aspirin and the antacid used is baking soda (sodium bicarbonate, NaHCO 3 ). To take the tablets, you should fully dissolve them in a glass of water, where they famously undergo a chemical reaction that produces lots of carbon dioxide (CO 2 ) bubbles. As the tablets dissolve, the sodium bicarbonate splits apart to form bicarbonate (HCO 3 ). This reacts with hydrogen (H + ) from citric acid, another ingredient in the tablets. This chemical reaction forms water and carbon dioxide gas. 3HCO3 +3H+ 3H2O+3CO2 Oct 29 9:27 AM 4
5 Homework Finish IV/DV Finish hypothesis with research! Dec 24 7:50 PM Warm Up (5 min) Date: Tuesday, 1/5/2016 Topic: Alka Seltzer Lab Purpose: To assess the Law of Conservation of Mass by designing an experiment to determine mass before and after a chemical reaction. 1. Write date, topic and purpose in notebook. You may write Continued. 2. Take out your annotated background information. Begin writing your hypothesis Hypothesis: If we cause a chemical change using alka seltzer and water then the mass of the products will be (greater than, less than or equal to) the mass of the reactants because. Nov 15 3:48 PM 5
6 Hypothesis: If we cause a chemical change using alka seltzer and water then the mass of the products will be (greater than, less than or equal to) the mass of the reactants because. Nov 6 8:40 AM Warm Up (5 min) Date: Tuesday, 1/5/2016 Topic: Alka Seltzer Lab Purpose: To assess the Law of Conservation of Mass by designing an experiment to determine mass before and after a chemical reaction. 1. Write date, topic and purpose in notebook. You may write Continued. 2. Take out your hypothesis and review it with someone at your table. If we cause a chemical change using alkaseltzer and water then the mass of the products will be (greater than, less than or equal to) the mass of the reactants because. Nov 15 3:48 PM 6
7 Discussion Leader Share 3 4 hypothesis Make sure you are giving evidence in your "because" statement! Jan 4 5:27 PM Lab Demo Watch carefully! Nov 19 7:30 AM 7
8 At your table, write down your materials. Hint: see pictures. Materials: 1. Flask 2. Triple Beam Balance (TBB) 3. Alka-Seltzer 4. Water 5. Goggles 6. Balloons 7. stopwatch Oct 29 7:48 AM Warm Up (5 min) Date: Wednesday, 1/6/2016 Topic: Alka Seltzer Lab Purpose: To assess the Law of Conservation of Mass by designing an experiment to determine mass before and after a chemical reaction. 1. Write date, topic and purpose in notebook. You may write Continued. 2. Take out your procedures Nov 15 3:48 PM 8
9 With your group, write your procedure. Make sure that your procedure includes: finding the mass of the tools finding the mass of the tools and reactants finding the mass of the tools and products Multiple trials (3) Dec 24 8:01 PM A What step is this? B What step is this? With your group, write your procedure. C What step is this? E What step is this? D What step is this? Make sure that your procedure includes: finding the mass of the tools finding the mass of the tools and reactants finding the mass of the tools and products Multiple trials (3) Nov 15 4:30 PM 9
10 Procedure: 1. Wear appropriate safety gear (goggles). 2. Measure the mass of the flask and balloon. Record this in data table: Mass of tools. 3. Pour 100ml of water into the flask. 4. Calculate the entire mass of the flask, 100 ml of water, tablet and balloon. Record this in the data table: Mass of tools and Reactants. 5. Place the tablet into the balloon and carefully attach the balloon to the opening of the flask without dropping the tablet into the water. 6. Get the stopwatch ready. 7. When ready, drop tablet into the water. 8. When the reaction stops stop the stopwatch and record the time. Calculate the mass of the entire contraption. Record this in the data table: Mass of tools and Products. 9. Repeat steps 1 8 two more times. Nov 6 8:42 AM Looking at your procedure: 1. Underline all the data you must gather/record. 2. Create a data table that reflects the required data using the template. Mass of Tools (balloon and flask) Mass of Tools and Reactants Mass of Tools and Products Include a title Include 3 trials Nov 15 4:19 PM 10
11 Closing (5 min): Data Table Review Share group data table on ELMO Explain your labeling: what data are you collecting? Dec 24 8:09 PM Data: The effect of a chemical change on the mass of alka seltzer and water (g) (0 minutes) (3 minutes) Trial Mass of tools: flask & balloon Mass of tools & Reactants: flask with 100 ml of water & balloon with tablet Mass of tools & Products: flask with water & balloon with carbon dioxide gas Difference in Mass of tools Reactants and Products: Oct 29 9:04 AM 11
12 Homework Complete Procedure (if needed) Complete data table (if needed) Bring graph paper Nov 15 4:28 PM Warm Up (5 min) Date: Friday, 1/8/2016 Topic: Alka Seltzer Lab Purpose: To assess the Law of Conservation of Mass by designing an experiment to determine mass before and after a chemical reaction. 1. Write date, topic and purpose in notebook. 2. Take out procedure, data table, notebook/pencil and clear desk. Nov 15 3:48 PM 12
13 Data: The effect of a chemical reaction on mass (g) (0 minutes) (----- minutes) Trial Mass of tools: flask & balloon Mass of tools & Reactants: flask with 100 ml of water & balloon with tablet Mass of tools & Products: flask with water & balloon with carbon dioxide gas Difference in Mass of tools Reactants and Products: Oct 29 9:04 AM Procedure: Wear appropriate safety gear (goggles). 2. Measure the mass of the flask and balloon. Record this in data table: Mass of tools. 3. Pour 100ml of water into the flask. 4. Calculate the entire mass of the flask, 100 ml of water, tablet and balloon. Record this in the data table: Mass of tools and Reactants. 5. Place the tablet into the balloon and carefully attach the balloon to the opening of the flask without dropping the tablet into the water. 6. Get the stopwatch ready. 7. When ready, drop tablet into the water. 8. When the reaction stops stop the stopwatch and record the time. Calculate the mass of the entire contraption. Record this in the data table: Mass of tools and Products. 9. Repeat steps 1 8 two more times. Nov 6 8:42 AM 13
14 Data: The effect of a chemical reaction on mass (g) (0 minutes) (----- minutes) Trial Mass of tools: flask & balloon Mass of tools & Reactants: flask with 100 ml of water & balloon with tablet Mass of tools & Products: flask with water & balloon with carbon dioxide gas Difference in Mass of tools Reactants and Products: Oct 29 9:04 AM Clean Up! 1: Balloons in trash 2: Liquid in Ms. Brunner's sink, rinse flasks 3: TBB on back counter, water bottles on back counter 4: Goggles in drawer Nov 15 5:09 PM 14
15 Warm Up (5 min) Date: Friday, 1/8/16 Topic: Alka Seltzer Lab 4 Purpose: To assess the Law of Conservation of Mass by determining mass before and after a chemical reaction. 1. Write date, topic and purpose in notebook. 2. In our experiment, what were the reactants? What were the products? 3. Take out data and graph paper. Nov 15 3:48 PM Copy the data table in your notebook: Trial Number Mass of Reactants (g) Mass of Products (g) Jan 7 4:34 PM 15
16 To find the mass of the reactants and the mass of the products for each trial... Calculate the Mass of the JUST the Reactants: Mass of tools and Reactants (column 2) Mass of tools (column 1) = Mass of Reactants = Calculate the Mass of the JUST the Products: Mass of tools and Products (column 3) Mass of tools (column 1) = Mass of Products = Trial Number Mass of Reactants (g) Mass of Products (g) Nov 23 6:31 PM The Law of Conservation of Mass Mass of Reactants = Mass of Products Nov 23 6:40 PM 16
17 Line Graph 1 line for each trial Use a different shape/color for each Make a key Mass (grams) Trial 1 Trial 2 The effect of a chemical change on mass (g) Trial Trial 3 Oct 29 11:20 AM Warm Up (5 min) Date: Friday, 1/8/16 Topic: Alka Seltzer Lab 4 Purpose: To assess the Law of Conservation of Mass by determining mass before and after a chemical reaction. 1. Write date, topic and purpose in notebook. 2. Take out your graphs. Nov 15 3:48 PM 17
18 Line Graph 1 line for each trial Use a different shape/color for each Make a key Mass (grams) Mass of Reactants) (BEFORE) 0 minutes The effect of a chemical change on mass (g) Mass of Products (AFTER) 3 minutes Chemical Change Oct 29 11:20 AM Data Analysis Describe the trends in your data using words and numbers. For example: In our lab we noticed that the mass of the reactants was (less than, greater than, equal to) as the mass of the products. The mass of our reactants in trial one was. The mass of our products in trial one was etc... Describe what your data MEANS using observations and evidence. Use your background information about Law of Conservation of Mass to explain. This should all be about 5 6 sentences. Nov 16 4:39 PM 18
19 Conclusion: Restate (rewrite) your hypothesis. Was you hypothesis supported? Explain how you know using numbers and words. What does your data mean? Use evidence from research and data to explain your findings. Ask at least one further investigation question. This should be relevant to the lab! Maybe something about Law of Conservation of Mass, chemical reactions, changing our lab to test something new Nov 6 8:49 AM Nov 10 2:07 PM 19
20 Limitations (Sources of Error) What errors could have happened in your lab that would have affected your data? Ex: There was a hole in the side of our balloon, so the carbon dioxide gas was able to leak out. This could have lowered the mass because we are losing matter. You must have at least one and must explain how it connects to your data! Jan 5 5:13 PM WRITE THESE DOWN! Follow Up Questions: 1. What is the relationship between chemical reactions and mass? 2. What kind of change took place when the alka seltzer tablets were added to the water? (explain with evidence) Identify the Products and Reactants that were part of this chemical reaction. 3. Do you think matter can be created, destroyed, neither or both after this investigation? (explain with evidence) YOU MUST WRITE OUT ALL FOLLOW UP QUESTIONS IN YOUR LAB REPORTS!!!!!!!!!!!!!!!!!!!! Oct 29 9:52 AM 20
21 Closing: Continue working on conclusion, graph, etc... Completed Alka Seltzer Lab due Wednesday, January 13! FOLLOW THE RUBRIC!!!!!!!!!!! Nov 4 7:24 AM 726 Procedure: underline the materials in your procedure 1 Wear appropriate safety gear (goggles). A What step is this? 2 Measure the mass of the flask and balloon. Record this in data table: Mass of tools. C What step is this? 3 Pour 100ml of water into the flask. 4 Calculate the entire mass of the flask, 100 ml of water, tablet and balloon. Record this in the data table: Mass of tools and Reactants. 5 Place the tablet into the balloon and carefully attach the balloon to the opening of the flask without dropping the tablet into the water. 6 Get the stopwatch ready. 7 When ready, drop tablet into the water. 8 When the reaction stops stop the stopwatch and record the time. Calculate the mass of the entire contraption. Record this in the data table: Mass of tools and Products. 9 Repeat steps 1 8 two more times. E What step is this? B What step is this? D What step is this? Oct 29 7:30 AM 21
22 Data: (continued) Send one person from your group to write in your masses: Chemical Reactions and Conservation of Mass Class Data Group Mass of Reactants Mass of Products What do you notice??? WHY??? Oct 29 9:56 AM Homework: Read pages in your textbook. Answer the 3 Self Check questions. DUE FRIDAY! Nov 16 4:51 PM 22
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