PUTTING IT TOGETHER: Classifying Chemical Reactions
Purpose: To observe and differentiate between the four different types of chemical reactions. Variables: The independent variables are the sodium chloride, sodium carbonate, magnesium,copper, copper (11) sulfate, silver nitrate, oxygen, lead(11) nitrate, sodium carbonate, copper (11) sulfate pentahydrate. The dependent variables are the chemical reactions that are being looked for. For example decomposition, synthesis, single displacement or double displacement of compounds or elements . Hypothesis: Part 1 : I believe that magnesium burning in oxygen will have synthesis reaction because the magnesium will react with the oxygen in the air forming MGO where before the two elements were separate but with added heat they have been able to become a new compound. Part 2: I believe that when the sodium chloride and silver nitrate are mixed a double displacement reaction will occur, making sodium nitrate and silver chloride because sodium is very reactive and therefore when the two elements react they will be switched with one another. Part 3: I believe that a double displacement reaction will occur when lead (11) nitrate and sodium carbonate mix because the sodium will pull the nitrate compound from the lead and the carbonate will be forced to bond with the lead. Part 4: I believe that a single displacement reaction will occur when copper (11) sulphate and magnesium are mixed because on the activity series magnesium is more reactive than copper and will therefore pull the sulphate away and bond with it. Part 5: I believe that a single displacement reaction will occur when silver nitrate and copper are mixed because on the activity series copper is more reactive than silver and will therefore pull the nitrate away and bond with it. Part 6: I believe that a decomposition reaction will occur when the pentahydrate is heated because the water will have evaporated leaving only copper sulphate without any drops of water in it. When the water is added a synthesis reaction will occur as water will have been added back with the copper sulphate.
Materials and Method: Part 1: magnesium burning in oxygen 1. Obtain a 2 cm strip of magnesium. Examine the magnesium carefully and record your observations. 2. Hold one end of the strip with tongs, and place the strip in the hottest part of the Bunsen burner flame. 3. Remove the strip from the flame as soon as the reaction starts. CAUTION: DO NOT LOOK DIRECTLY AT THE FLAME. 4. Record your observations. Part 2: sodium chloride and silver nitrate 1. Place approximately 1 mL of sodium chloride solution in a test tube. In a second test tube, pour approximately 1 mL of silver nitrate solution. Record initial observations of the reactants. SILVER NITRATE IS TOXIC AND WILL STAIN SKIN AND CLOTHES. 2. Pour the sodium chloride into the test tube containing the silver nitrate solution. Let stand for a few minutes. 3. Record your final observations Part 3: lead (II) nitrate and sodium carbonate 1. Place approximately 1 mL of lead (II) nitrate solution in a test tube. In a second test tube, pour approximately 1 mL of sodium carbonate solution. Record initial observations of the reactants 2. Pour the sodium carbonate into the test tube containing lead (II) nitrate. 3. Record your final observations. Part 4: copper (II) sulfate and magnesium 1. Place about 2 mL of copper (II) sulfate solution in the test tube. 2. Obtain a small (2 cm) strip of magnesium and record your initial observations. 3. Add the magnesium to the solution. 4. After a few minutes, record any changes you observe. Part 5: silver nitrate and copper 1. Place about 2 mL of silver nitrate solution into a test tube. 2. Obtain a small (1cm) strip of copper and record your initial observations for the reactants 3. Add the copper to the solution. 4. Record your final observations, after leaving the test tube for a few minutes. Part 6: copper (II) sulphate pentahydrate Part A: 1. Using a scoopula,...
Please join StudyMode to read the full document