liquid. “pop” sound when burning splint placed near mouth of test tube 3 Copper (II) sulfate (CuSO4) added to water CuSO4 – solid‚ blue‚ powder‚ odourless‚ opaque Water – liquid‚ colourless‚ transparent‚ low viscosity‚ odourless CuSO4 dissolved in the water and created a blue solution (transparent‚ blue‚ low viscosity) 4 Steel wool added to CuSO4 Steel Wool – solid‚ grey‚ metal‚ ductile‚ medium lustre CuSO4 – liquid‚ blue‚ transparent‚ low viscosity Test tube felt warm Dark red solid appears as steel
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Introduction Enthalpy change‚ ΔH‚ is defined as the heat output of a system as it goes through a reaction under constant pressure. It is an important aspect of thermochemistry‚ which is the study of energy changes during a chemical or physical reaction . When we calculate enthalpy change‚ we always assume that the pressure is constant. We are able to calculate enthalpy change numerous ways‚ notably by the increase in heat‚ Q‚ given by an exothermic reaction or the heat absorbed by an endothermic
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each approx 1 cm × 1 cm 3 test tubes Part 4. Effect of a Catalyst 3% hydrogen peroxide‚ H2O2 – 10 mL per group 0.1 M iron(III) nitrate‚ Fe(NO3)3 0.1 M sodium chloride‚ NaCl 0.1 M calcium chloride‚ CaCl2 0.1 M potassium nitrate‚ KNO3 0.1 M manganese chloride‚ MnCl2 100-mL graduated cylinder 10-mL graduated cylinder 7 test tubes per group 1 PROCEDURES Part 1. Effect of Particle Size on
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Reducing Sugars : Sugars that contain aldehyde groups that are oxidised to carboxylic acids are classified as reducing sugars. Common test reagents are : Benedicts reagent (CuSO4 / citrate) Fehlings reagent (CuSO4 / tartrate) They are classified as reducing sugars since they reduce the Cu2+ to Cu+ which forms as a red precipitate‚ copper (I) oxide. Remember that aldehydes (and hence aldoses) are readily oxidised (review ?) In order for oxidation to occur‚ the cyclic form must first ring-open
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appearance that can vary in colour and have a naming scheme based on the compound and number of water molecules that are in the hydrate. Copper(II) sulfate pentahydrate‚ or CuSO4 * 5H2O‚ is a ratio of one copper sulfate to five (penta) molecules of water. Copper sulfate pentahydrate is a blue hydrate while anhydrous copper sulfate (CuSO4) is white. To get anhydrous copper sulfate‚ copper sulfate pentahydrate must go through an endothermic reaction and have all of its water molecules evaporated. It then
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electrolyte (in molten or aqueous state) which is capable to conduct an electric current and it becomes waste afterwards. The process of electroplating is applied in the use of car batteries‚ where the substance‚ copper (II) sulfate (CuSO4) becomes the waste of the process. CuSO4 is a toxic chemical‚ where when in contact can cause irritation or itching to the skin. It is usually used as a main ingredient of pesticide‚ when it is mixed with other chemical
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Cuprammonium Rayon threads from Filter Paper AAKASH NARAYAN XII-B DON BOSCO SCHOOL i.n.d.e.x 1. Objective 2. Certificate 3. Acknowledgement 4. Apparatus 5. Chemicals 6. Summary 7. Introduction 8. Procedure 9. Precautions 10. Bibliography o.b.j.e.c.t.i.v.e To make Cuprammonium Rayon Threads From Filter Paper c.e.r.t.i.f.i.c.a.t.e This is
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Reaction equation | How will you ID the product? | Zn(s) + CuSO4 (aq) ZnSO4(aq) + Cu(s)Zn0(s) Zn2+(aq) +2e-Cu+2(aq)+2e- Cu0(s) | You will Id the products by the chemical reaction that will occur. Zinc be the element under going oxidation as it looses electrons and copper will be the reduction as it gains electrons. | Pb(s)+CuSO4 (aq) Cu SO4 (aq) + Pb(s) | No reaction. There will be no gaining or loosing electrons | Fe(s)+CuSO4 (aq) + FeSO4 (aq) +Cu(s)Fe0(s) Fe+3(aq) +3e-Cu+2(s) + +-e Cu0(s)
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CHEMICAL REACTIONS OF COPPER AND PERCENT YIELD Objective To gain familiarity with basic laboratory procedures‚ some chemistry of a typical transition element‚ and the concept of percent yield. Apparatus and Chemicals |0.5 g piece of no. 16 or no. 18 copper wire |evaporating dish | |250 mL beaker (2) |weighing paper | |concentrated HNO3 (4 – 6 mL)
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www.kalvisolai.com 5 Mark Compulsory Problems with Solution 1 +2 CHEMISTRY Q. 70 Compulsory Problems with Solution Problems are solved in easiest way (As per Government Answer Key) www.kalvisolai.com 5 Mark Compulsory Problems with Solution 2 SALIENT FEATURES Dear Students ❆ Q.No: 70 is asked as compulsory problem in Govt Exam. ❆ Two problems to be answered out of four problems. ❆ To simplify the problem‚ hints and expected compounds related to molecular formula‚ general formula are
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