crucible after it has been heated‚ and let cool before weighing. 3. Place the crucible and cover on the triangle with the lid slightly tipped. Heat until the crucible is glowing slightly red. Record the mass 4. Using the spatula add 3g of copper sulfate hydrate crystals to the crucible and determine the mass. 5. Place the crucible on the triangle with the lid slightly tilted. Heat gently for 2-3 minutes and heat to crucible for minutes. You will observe a color change. Cool and record mass
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CHEMISTRY Guess Paper – 2013 Class – XI Subject - CHEMISTRY MAX MARKS=90 ……………………………………………………………………………………… General instructions: All questions are compulsory. Marks for each question are indicated against it. Questions number 1to 8 are very short –answer questions‚ carrying 1 mark each. Answer these in one word or about one sentence each. Questions number 9 to18 are short –answer questions‚ carrying 2 marks each. Answer these in about 30 words each. Questions number19 to27
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Reactions of Copper Objective The objective of this lab is to convert copper (Cu0) “in a series of reactions to various compound containing copper as the Cu2+ species” (CHM111 Laboratory Manual) in order to prove the Law of the Conservation of Mass. Introduction In this experiment‚ we took a look at how copper (Cu0) reacts with different substances to get an end result where it is transformed back to its original state. There were five different reactions that involved copper. We first experimented
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process! 1) When lithium hydroxide pellets are added to a solution of sulfuric acid (dihydrogen sulfate)‚ lithium sulfate and water are formed. 2) When dirty water is boiled for purification purposes‚ the temperature is brought up to 1000 C for 15 minutes. 3) If a copper coil is placed into a solution of silver nitrate‚ silver crystals form on the surface of the copper. Additionally‚ highly soluble copper (I) nitrate is generated. 4) When crystalline C6H12O6 is burned in oxygen‚ carbon dioxide
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the glowing splint test was done to the contents of the test tube and the glowing splint became brighter almost to the point where it almost reignited which proved the presence of oxygen gas. Station 2 A small piece of copper was added to 5 drops of silver nitrate and to copper appeared to
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forms of energy Thermochemistry is a branch of thermodynamics that deals with the heat involved with chemical and physical changes Objectives 1. Define thermodynamics & thermochemistry 2. Define energy‚ heat and other thermodynamic terms 3. Define enthalpy 4. Discuss thermochemical equations 5. Define spontaneity‚ entropy and Gibb’s free energy Why study thermochemistry? • • it allows us to predict whether a certain process would occur spontaneously or not however‚ its limitations is that‚ it can
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just enough water but not too much. I guess if the dirt dries up‚ you’ll have to water the batteries along with the rest of the plants. The soda can version works but I haven’t tested extensively. You don’t really have to use a penny‚ just has to be copper. Perhaps other common materials would work better. Each cell gives you a useless 0.5 volts. But if you link them in series you can get more. I was able to light up an LED decently with 4 cells. Not quite as bright as Alkalines‚ but you get what you
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protection timer 2 measuring cylinders (100 cm3) pipette paper with a black cross on it Chemicals required sodium thiosulfate solution (15 g/dm3) cobalt(II) chloride solution (0.1 mol) iron(III) nitrate solution (0.1 mol) copper(II) sulfate solution (0.1 mol) iron(II) sulfate solution (0.1 mol) What to do 1 Draw a cross on a piece of paper and put it underneath a 100 cm3 measuring cylinder‚ or use the cross from part 2‚ so it can be seen when looking down the cylinder. 2 Pour 50 cm3 of sodium
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two drops of the Cobalt (II) Nitrate in seven of the wells. I then moved to the next row and placed two drops of Copper (II) Nitrate in the next row‚ into seven of the wells‚ and so on with the other three Nitrates. I then cut off the top of the Sodium Phosphate and added two drops to the Cobalt (II) Nitrate and observed the reaction and recorded the results. Then two drops into the Copper (II) Nitrate‚ observed and recorded‚ same with the remaining three Nitrates. I then moved to the second row‚ and
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aceto-orcein solution. The last experiment is to test the existence of proteins in cooked egg white. If protein is present in cooked egg white‚ the transparent solution of sodium hydroxide and cooked egg white will turn into purple when it is mixed with copper sulfate solution. Therefore‚ all macromolecules exist in all given samples. Introduction Macromolecules are large organic molecules which can be categorized into four major classes. They are carbohydrates‚ lipids‚ nucleic acids and proteins. Carbohydrates
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