Name: Period: Date: Skill 1: Determine the type of equation Evidence:

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1 Name: Period: Date: KIPP NYC College Prep General Chemistry CHEMISTRY LAB #12 Types of Reactions: Lab 60 MINUTES PRELAB Do Now! Consider the following reaction that produces NO 2. Skill 1: Determine the type of equation Evidence: N 2(g) + O 2(g) NO 2(g) Skill 2: Balancing Equations. Balance the equation above using the lowest whole number ratios. Skill 3: Missing Mass In the reaction above 10 g of N 2 reacts to produce 25 g of NO 2. How many grams of O 2 reacted? Skill 4: Empirical Formulas Explain why NO 2 is a molecular and empirical formula. Skill 5: Mole to Mole Ratios Write the mole ratios of NO 2 to O 2 in fraction form. PURPOSE: To observe and analyze different types of chemical reactions. MATERIALS: Solid Fe, S, Solutions of HCl, Na 2CO 3, CaCl 2 Pipettes for each solution, scoopula for iron Demo Procedure Synthesis Reaction 1. Watch your teacher combine iron filings and sulfur. In data table 1, record observations. Observations: 1. Fe and S + heat! Table 1: Fe(s) and S(s) Synthesis reaction

2 Lab Procedure and Data Single Replacement Reactions: 1. Iron (Fe) and Hydrochloric Acid (HCl): Place a small sample of iron filings (grain of rice) in a test tube. Add approximately.5 ml (half a dropper) of 1 M HCl. Caution: hydrochloric acid is potentially dangerous is on skin or eyes. Please wear gloves and eye protection Table 2: Single Replacement Reactions Reaction Observations Fe and HCl Lab Procedure and Data Double Replacement Reactions: 2. Calcium Chloride and Sodium Carbonate: Add approximately.5 ml (half a dropper) of calcium chloride (CaCl 2) into a second test tube. Add approximately.5 ml (half a dropper) of sodium carbonate (Na 2CO 3). Stir. Record your observations. Table 3: Double Replacement Reactions Reaction Observations Calcium Chloride and Sodium Carbonate ANALYSIS QUESTIONS: Directions: Answer the following questions in your lab notebook based on your results. Synthesis Reaction: 1. Fe(s) + S(s) Fe 2S 3(s) b) Explain how this is an example of a synthesis reaction. d) If you start with 4.0 mol of Fe, how many mol of Fe 2S 3 will be produced? Missing Mass Review Problem: 2. In a second trial, Mr. Becker added 150 g of Fe to a beaker and heated it with sulfur. 250 g of Fe 2S 2 was produced. How much S reacted? g S.

3 Single Replacement Reactions: 3. Fe(s) + HCl(aq) FeCl 2(aq) + H 2(g) b) Explain how this is an example of a single replacement reaction. d) If you start with 4.0 mol of Fe, how many mol of FeCl 2 will be produced? Double Replacement Reactions: 4. CaCl 2(aq) + Na 2CO 3(aq) CaCO 3(s) + NaCl (aq) b) Explain how this is an example of a double replacement reaction. d) If you start with 2.0 mol of CaCl 2, how many mol of CaCO 3 will be produced? Regents Review A 1.00-mole sample of glucose, C 6H 12O 6, completely reacts with oxygen, as represented by the balanced equation below. C 6H 12O 6(s) + 6O 2(g) 6CO 2(g) + 6H 2O(l) + energy 5. Write the empirical formula for glucose. [1] Baking soda, NaHCO 3, can be commercially produced during a series of chemical reactions called the Solvay process. In this process, NH 3(aq), NaCl(aq), and other chemicals are used to produce NaHCO3(s) and NH 4Cl(aq). To reduce production costs, NH 3(aq) is recovered from NH 4Cl(aq) through a different series of reactions. This series of reactions can be summarized by the overall reaction represented by the unbalanced equation below. NH 4Cl(aq) + CaO(s) NH 3(aq) + H 2O(l) + CaCl 2(aq) 6. Balance the equation for the overall reaction used to recover NH3(aq), using the smallest wholenumber coefficients. [1]

4 Name: Date Completed: CHEMISTRY LAB #12 Identifying Chemical Reactions 60 MINUTES RUBRIC Period: Minutes Earned: Data, Observation, Data Analysis All data is properly recorded and includes details from each test. All data tables are set up in a logical, easy-to-read manner. All data is properly recorded and includes details from each test Tables are set up but not entirely easy to follow. Most data is properly recorded. Some details might be missing. Tables are set up but not entirely easy to follow. Data is incomplete. Data table is not present. Analysis Questions All answers are All answers are 4-5 answers are Most answers are 2-3 answers are Most answers are Less than 2 answers are OVERALL LAB: /8 POINTS (Scaled to 100) FINAL SCALED SCORE: Complete! Need to Revise

5 Types of Reactions Within your team, one person must be responsible for all of the following tasks. Material Expert: Responsible for picking up supplies and making sure everything is placed back into the basket in a clean way. Reactor: Responsible for mixing the contents of test tubes, placing test tubes in empty beaker and placing beaker on balance. Clean-up Crew: Responsible for rinsing out graduated cylinders and test tubes at appropriate times. Data Recorder: Responsible for initially writing down all observations and measurements. Everyone will then record this data in their lab books appropriately. Types of Reactions Within your team, one person must be responsible for all of the following tasks. Material Expert: Responsible for picking up supplies and making sure everything is placed back into the basket in a clean way. Reactor: Responsible for mixing the contents of test tubes, placing test tubes in empty beaker and placing beaker on balance. Clean-up Crew: Responsible for rinsing out graduated cylinders and test tubes at appropriate times. Data Recorder: Responsible for initially writing down all observations and measurements. Everyone will then record this data in their lab books appropriately.