Classifying Chemical Reactions
Purpose: The purpose of this experiment is to observe a variety of chemical reactions and to identify patterns in the conversion of reactants into products.
Apparatus:
• Bunsen or lab burner -Test tube clamp
• Butane safety lighter - Test tube rack
• Evaporating dish - Wash bottle
• Forceps or crucible tongs - Wood Splints
• Heat resistant pad
• Litmus paper
• Pipets
• Spatula
• Test tubes
Materials:
Ammonium carbonate, 0.5g
Calcium carbonate, 0.5g
Copper chloride solution, 4mL
Hydrochloric acid, 4mL
Magnesium ribbon, 2-4 cm strips
Phenolphthalein indicator, 1 drop
Sodium hydroxide solution, 1mL
Sodium phosphate solution, 1mL
Water
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28. Record the observations in the data table.
Reaction 8)
29. Working in the hood or a designated work area, add about 1 mL of ethyl alcohol to a clean evaporating dish. Place the evaporating dish on a heat- resistant pad.
30. Cap the alcohol bottle and remove it from the work area.
31. Fill a test tube about 1/3 full with cold tap water for use in step 34.
32. Light a butane safety lighter and bring the flame close to the alcohol in the evaporating dish.
33. Turn off the safety lighter as soon as the alcohol ignites.
34. Place the test tube containing cold water in a test tube clamp and hold the test tube above the burning alcohol. Observe the outside of the test tube for evidence of product formation.
35. Allow the alcohol to burn until it is completely consumed.
36. Record observations in the data table.
Observations and Data:
Reaction Appearance of Reactants
1 It got really bright
2 It sizzled, bubbled, and it turned really hot
3 It kept getting smaller and smaller until there was nothing left
4 It sizzled, turned bubbly white, and made crackling noises
5 It broke apart and turned black
6 It looks gunk and blue. It has white stuff at the bottom
7 Turned a dark pink and felt a little cold
8 There was fire and when we put the water over the fire condensation appeared.
Questions and Problems:
1. Write a balanced chemical equation for each reaction #1-8. Classify each reaction using the information provided in the
2. Used a test tube clamp to held the test tube and gently heated the tube in a laboratory burner flame for about 30 seconds.
Procedure: In this experiment, various chemicals were mixed together, to determine a reaction. Using two drops from chemical 1 and two drops of chemical two, unless otherwise stated, then recording the type of physical reaction or color changes that occurred.
27. Heat the water to 40°C with an alcohol lamp by setting up the apparatus as shown in figure 3 below:
A chemical reaction is when substances (reactants) change into other substances (products). The five general types of chemical reactions are synthesis (also known as direct combination), decomposition, single replacement (also known as single displacement), double replacement (also known as double displacement), and combustion. In this lab, the five general types of chemical reactions were conducted and observations were taken before, during, and after the reaction. Then the reactants and observations were used to determine the products to form a balanced chemical equation. The purpose of this lab was to learn and answer the question: How can observations be used to determine the identity of substances produced in a chemical reaction?
17) Pour a small amount of the hot solvent into the flask containing the solid.
There are now many classification systems to classify the different types of reactions. These include decomposition, polymerization, chain reactions, substitute reactions, elimination reactions, addition reactions, ionic reactions, and oxidation-reduction reactions.
Once the water is at the desired temperature, place the small lamp 5cm away from the beaker and turn it on.
The purpose of this experiment is to distinguish the relationships between reactants and products, in addition to expanding on concepts such as single displacement reactions, mole ratio values, moles to mass, theoretical yields, limiting reactants, excess, stoichiometric relationships and percentage errors.
alcohol (2-methyl-2-butanol, MW _ 88.2, d _ 0.805 g/mL) and 25 mL of concentrated hydrochloric acid (d _ 1.18 g/mL). Do not stopper the funnel. Gently swirl the mixture in the separatory funnel for about 1 minute. After this period of swirling, stopper the separatory funnel and carefully invert it. Without shaking the separatory funnel, immediately open
1 ml of water should be added to the first test tube and make a note. In the second test tube, 1 ml of methyl alcohol should be added. In the third test tube, 1 ml of hexane must be added. Lastly, the fourth test tube will be a control.
When dealing with chemical reaction there are equations called chemical equations. Chemical equations give the reactants and products of a chemical reaction. When given just the reactants of an equation, you can predict the products by balancing each side of the equation. The products and reactions are separated by an rnx arrow
Submerge the graduated cylinder in the plastic tub so that it is completely filled with water. Hold the open end of the graduated cylinder and move it vertically upside-down where the open end of the graduated cylinder is still submerged in the plastic tub. Clamp the graduated cylinder the ring stand of the lab table to keep it in place. perforate a hole in the top of the rubber cork for the solution container. Cut a straw the length of about four inches. place the straw inside of the rubber cork hole. Set up your timer for two minutes.
Once the desired flame was seen, sterilized the loop by placing it on a 45̊ angle so that the entire piece of metal was sterilized. Waited until the loop turned a red/orange color, then removed it and allowed the loop to cool off.
1. Number four clean test tubes 1-4. 2. Place 1 ml (or 20 drops) of the following solutions into each tube: water, egg albumin, starch, and chicken broth. 3. Add 3 drops of Buiret reagent to each tube and gently shake
Collect to 2 large beakers both large beakers are to be filled with hot water (labtutor). Then obtain seven conical tubes these will be used to collect the levels of gas, you will also need test tube a stopper and a plastic tube (labtutor). You want to fill the conical tube to at least 50 ml of water (Cressy). Take the four conical tubes filled with water and place two in each beaker, to do this you must invert the tube and cover the release hole as to not lose any water (Cressy). Then place the beakers with the tubes in the bath so they can be at the same temperature as the bath (Cressy). Next mark all of your test tubes in number order to be sure which tube contains what concentrations and pH (Cressy). Having mixed a solution to the specifications of 2.5 ml of glucose in all tubes, 3 ml of yeast in 2 tubes of pH 5, 2 tubes of pH 9, and the single pH 7 tube, the remaining two tubes will contain no yeast as they will be negative controls. Next add 2 ml of pH buffer 3 tubes will receive pH of 5, three will receive a pH of 9 and a single tube of pH 7. Finally add pure water to make sure all test tubes have 10 ml of solution. When making the solutions