crucible and the hydrate. Subtraction of the mass of the empty crucible from the mass of the hydrate and crucible gives the mass of the CuSO4 hydrate. -20.97 grams 2. Heat the hydrate. After heating‚ record the mass of the crucible and the dehydrated compound. -20.44 grams 3. Subtracting the mass of the empty crucible from the mass of the crucible and dehydrated CuSO4 gives you the mass of the dehydrated compound. -0.94 grams 4. Subtract the mass of the dehydrated compound from the mass of the hydrate
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clumps into blue-ish chunks | Added heat (removes H2O) | none | solution becomes muddy black-ish | CuO (s)copper oxide | heated into small‚ black‚ metallic almost shards | Added sulfuric acid | H2SO4 (aq) | turns shards and liquid blue-ish color | CuSO4 (aq)copper sulfate | joins the sulfate after filtering | Added zinc | Zn (s) | small‚ orange‚ metallic shards form in blue
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The Copper Cycle Alexes Montalvo Chem 1500-10 September 26‚ 2012 The Copper Cycle Introduction: The Copper Cycle is a popular experiment used to determine if an element‚ in this instance‚ copper‚ reverts to its elemental form after a chain of reactions. This experiment is very dangerous because of the reactions between the strong acids and bases. In this experiment I performed a series of reactions starting with
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to as the precipitate. Any substance with solubility less than 0.01 mol/L is considered insoluble. The formula of the insoluble product‚ lead iodide (PbI2)‚ can be written by balancing charges. The second product of this reaction‚ potassium nitrate (KNO3)‚ will remain in the solution. Balancing this reaction requires two I- ions for each Pb2+. Since Pb(NO3)2 contains Pb2+ ions and KI contains I- ions and we know that opposites attract‚ the formula for the insoluble product must be PbIn. The goal of
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WHAT IS PHARMACOGNOSY? Pharmacognosy is the study of drugs of natural origin. The term comes from two Greek words: "pharmakon" meaning drug or medicine‚ and "gnosis" meaning knowledge. The American Society of Pharmacognosy defines pharmacognosy as "the study of the physical‚ chemical‚ biochemical and biological properties of drugs‚ drug substances or potential drugs or drug substances of natural origin as well as the search for new drugs from natural sources". Plant preparations are said
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Extended Experimental Investigation Cold Pack Year 12 Chemistry Abstract: Cold packs are based on the principle of endothermic reactions‚ which means a reaction that absorbs heat from the surrounding resulting in a temperature drop. Due to this temperature drop‚ cold packs have many benefits when it comes to injuries such as sprains and strains. It cools the local tissue and reduces bleeding‚ swelling and pain. It also aids in a speedy recovery. The most commonly used
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creating a seal. 4. Record the temperature of the solution after two minutes. 5. Calculate the change in temperature per mole of solid. Observations: Salt | Mass (g) | Initial Temp. (˚C) | Final Temp. (˚C) | Change in Temp. (˚C) | KNO3 | 5g | 22˚ | 19˚ | 3˚ | NH4NO3 | 10g | 11˚ | 4˚ | 7˚ | NaC2H3O3H2O | 10g | 14˚ | 11˚ | 3˚ | Calculations: See attached sheet Evaluation/Sources of Error: a) see attached sheet b) Sources of error: * Heat transferred to surrounding
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molecules (such as glucose) connected to each other. Most foods are known to be combinations of macromolecules. METHODS The tests performed were iodine testing for starch‚ Benedict’s test for glucose‚ the grease spot test for lipids‚ and the CuSO4’s test for protein. The pH indicator’s detection is based upon observing a chemical change that takes place most often a change in color. The Starch test was used for the presence of starch. In this instance‚ the distilled water is a negative control
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THE UNIVERSITY OF THE WEST INDIES □ Supplemental/Summer School □ Examinations of December /April/May □ /July □ 2009 Originating Campus: Cave Hill □ Mona St. Augustine □ Mode: On Campus By Distance □ Semester l Semester II Course Code and Title: CHEM1901 - INTRODUCTORY CHEMISTRY A Date: Duration: Time: 2 Hours. Paper No: 1 Materials required: Answer booklet: Calculator: (where applicable) Multiple Choice answer sheets: Programmable □ □ numerical
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Copper Cycle Summary During the copper cycle lab‚ my partners and I performed a series of reactions on copper powder and observed the changes it underwent. For the first step‚ we mixed nitric acid and copper powder‚ and noticed that a yellowish brown gas emerged‚ along with effervescence. The red solid disappeared and became a blue liquid. We know that we produced copper nitrate‚ nitrate gas‚ and water because the only two blue solutions in “A New Language” are copper sulfate and copper nitrate
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