Statistical significance vs meaningfulness

Limiting Reactants: Copper (II) Chloride and AluminumAbstractThe reaction of copper (II) chloride with aluminum was performed to identify the products formed, type or reaction, theoretical yield of the product, and percent yield of the product. We combined 2.01675 grams of CuCl2 with 0.20 grams of aluminum. The theoretical yield of the copper, the precipitate, was 0.705 grams; however, we recovered 1.03 grams of copper. 146% was our percent yield. Our percent error was 46%. We concluded that this reaction created a single displacement and the limiting reactant is aluminum. IntroductionFor this lab, we will be reacting copper (II) chloride with aluminum. When we put these two reactants together, we believe that copper metal and aluminum chloride will be the products. This is an example of single displacement. We believe that copper metal and aluminum chloride will be the products because single displacement happens a lot when copper is involved a reactant. According to WikiEditor.org, our hypothesis should be correct. Copper (II) sulfide and aluminum both have a wide range of uses. Copper (II) sulfide is used as a catalyst for organic and inorganic reactions, mordant with dye for dyeing and printing textiles, pigment for glass and ceramics, wood preservative, disinfectant, insecticide, fungicide, herbicide, purifying agent in the petroleum industry, laundry marking ink, and tint bath for iron and tin. Copper (II) sulfide is very toxic. It is found naturally in nature; however, it is very rare. Aluminum is used as cans, foils,
kitchen utensils, window frames, and airplane parts. It is the second most malleable metal. It is usually used as an alloy because aluminum itself isn’t very strong. Aluminum can form a very reflective coating when it is vacuumed. These aluminum coatings are used as telescope mirrors, decorative paper, packages, and toys. Aluminum is the most abundant metal in the Earth’s crust (about 8.2% of the Earth’s crust is made of aluminum); however, it is never found in its pure form in nature. It is always in a compound with another element. Data1.Grams of copper (II) chlorideMolarity = moles/liters of solution0.500M = mol/0.03 L(0.500M)(0.03L) = 0.015 mol0.015 mol CuCl2134.45 grams CuCl2 =2.01675 grams CuCl21 mol CuCl22. Mass of filter paper: 0.66 grams3. Mass of aluminum foil: 0.20 grams4. Observations BeforeAfter-Aluminum foil (solid) is silver-Aluminum foil is shiny-CuCl2(liquid solution) is blue-Red, brown solid-Red solid isn’t shiny, it’s dull -Red solid broken in many pieces-Green, grey liquid solution left5. Observations of precipitate