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3_2: More Chemical Changes November 6 & 7, 2014 Do Now • Give three signs that tell you that a chemical change has happened. Objective • I can determine whether chemical reactions have taken place, and cite my evidence using P-FARTS in a ‘Chemical Reactions Investigation’. Agenda 1. 2. 3. 4. 5. 6. Do Now, Objective (10 min) Investigate: Chemical Reactions (20 min) Analysis Questions (15 min) Chemical Reaction Demo (10 min) You ARE The Reaction (10 min) Weekly Quiz (15 min) Reminder Unit 2 Test Retakes Thursday – after school Friday – lunch Questions must be corrected with explanations to retake!! HOMEWORK • Make a decorative poster explaining 4-6 signs that show a chemical reaction has taken place. • The top 3 signs will be laminated and displayed in the classroom to help you during labs and quizzes • See Ms. B if you need paper, markers, etc. to take home for the night. • DUE MONDAY/TUESDAY Weekly Review • New Words: – Chemical change – Physical change – Chemical reaction – Reactants – Products – Concentration – Unsaturated Solution – Saturated Solution – Supersaturated Solution Investigate: Chemical Reactions • In today’s lab, you will be looking at chemical reactions that occur between 8 different solid materials. The solids have been dissolved in water to make solutions. Barium nitrate (Ba(NO3)2) Sodium hydrogen carbonate (NaHCO3) Potassium iodide (KI) Iron (III) nitrate (Fe(NO3)3) Sodium hydroxide (NaOH) Copper (II) sulfate (CuSO4) Silver nitrate (AgNO3) Hydrochloric acid (HCl) “Wellplates” Ba(NO3)2 Ba(NO3)2 NaOH NaHCO3 CuSO4 KI NaOH NaHCO3 CuSO4 KI Thought Questions • Answer questions 1-7 on the back of data table 1. Chemical Reaction Demo • Combine baking soda (NaHCO3) and calcium chloride (CaCl2) in a plastic bag. 1. Quickly add 10 mL of distilled water and reseal the bag. What happens? What do you see? Feel? Think Pair Share • Did a chemical reaction occur between the baking soda and the calcium chloride? How do you know? The Chemical Reaction! • When baking soda and calcium chloride are combined they produce an aqueous solution of sodium chloride and calcium carbonate along with carbon dioxide, water, and heat. 2NaHCO3(aq) + CaCl2(aq) 2NaCl(aq) + CaCO3(s) + H2O(l) + CO2(g) REACTANTS PRODUCTS When I test this solution with litmus paper, it turns yellow. This shows me that the chemicals produced are ACIDS (pH 1-6) The Chemical Reaction! What are the names of the reactants? The products? 2NaHCO3(aq) + CaCl2(aq) 2NaCl(aq) + CaCO3(s) + H2O(l) + CO2(g) REACTANTS PRODUCTS Weekly Recap • You learned about the differences between chemical and physical changes • You learned that solutions are made of a solute and a solvent • You learned that solutions have different concentrations (concentrated or dilute) • You learned that solutions can be unsaturated, saturated, or supersaturated • You learned that chemical reactions ususally produce 1 or more P-FARTS (precipitates, formation of a gas, aromas, replacement, temperature change, or new substance) Weekly Quiz • Complete your weekly quiz silently. When you are finished turn your quiz in, and put away your materials. Procedures – Part 1 1. Add 1 drop of barium nitrate (Ba(NO3)2) to boxes 1-7 on your “wellplate” 2. Add 1 drop of sodium hydroxide to box 2 3. Write down any observations (remember P-FARTS) on data table 1 4. Add 1 drop of sodium hydrogen carbonate to box 3 and write down your observations on data table 1 5. Add 1 drop of copper (II) sulfate to box 4 and write down your observations on data table 1 6. Continue to mix different solutions using the rubric on your ‘wellplate’. MAKES SURE TO WRITE DOWN YOUR OBSERVATIONS Data Table Symbols • NRx = no reaction • PPT = precipitate • Soln = solution