consists of a zinc strip placed in an aqueous solution of Zn(NO3)2‚ and the other has a nickel strip placed in an aqueous solution of NiCl2. E°red(Zn2+/Zn) = −0.76 V E°red(Ni2+/Ni) = −0.28 V Which one of the following occurs at the anode and which at the cathode? (i) Ni2+(aq) + 2e- Ni(s) (ii) Zn2+(aq) + 2e- Zn(s) (iii) Ni(s) Ni2+(aq) + 2e(iv) Zn(s) Zn2+(aq) + 2ea) i anode‚ iv cathode b) i cathode‚ iii anode c) i anode‚ iii cathode d) i anode‚ ii cathode e) i cathode‚ iv anode (Zinc is more easily
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Questions for Bidding for Anatamina EGADE LUIS MENDEZ 1. In what way is the development of a copper mine like Antamina a real option? In what way is the bidding structure put in place by the Peruvian government an option? The mine had a valuable real option component‚ in the form of the right to develop the mine after completing exploration. The Peruvian government requested the bidders to state both the premium that they would pay and exercise price (development expenditure) they would
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Pennies may have been useful several years ago; however‚ now they are inconvenient and obsolete. As an American citizen who pays with U.S. currency almost every day and almost every day‚ inconvenienced by the use of pennies. Pennies make even less sense provided the fact that the United States Government has made such a large amount of pennies that the materials used to make pennies are worth more than a penny itself. Other countries have already done this and it is working out well for them‚ therefore
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calcium sulfide. Δ Ca (s) + S (s) → CaS (s) b. Hydrogen gas reacts with fluorine gas to produce hydrogen fluoride gas. H2 (g) + F2 (g) → 2 HF(g) c. Solid aluminum metal reacts with aqueous zinc chloride to produce solid zinc metal and aluminum chloride. (Check the Solubility Rules to determine the phase of matter of aluminum chloride.) 2 Al (s) + 3 ZnCl2 (aq) → 2 Zn (s) + 2 AlCl3 (aq) 4. Translate the following chemical equations
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place. Independent- The time when Zinc powder is adedd to the water‚ and the amount of Zinc‚ and the water in the cup. Dependent- Change of Water temperature. Materials -Measuring Celinder-Copper Sulphate Solution ( 1M CuSO4) -Polystyrene Cup- Zinc Powder -Balance-Thermometer -Watch or a Clock with second hand- Safety Spectacles Procedure First‚ we measured 25 ml of Copper Sulphate Solution into a Polysterene Cup. Then‚ we weighed 6g of Zinc Powder on a piece of paper. We
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Your table should include three features of the flowers. [6] © UCLES 2009 0653/06/M/J/09 [Turn over 4 2 The teacher gives a student a piece of zinc and some dilute hydrochloric acid. The student uses the apparatus in Fig. 2.1 to investigate the speed of reaction of the zinc and hydrochloric acid. hydrogen measuring cylinder For Examiner’s Use zinc dilute hydrochloric acid 100 Fig. 2.1 • • • The student places 4 cm3 of the acid in a test-tube. He starts his clock. Every minute‚ he records in
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Science POTATO BATTERY: THE ADVENT OF TECHNOLOGY TABLE OF CONTENTS RESEARCH……………………………………………………………………...I PURPOSE……………………………………………………………….….……II DISCUSSION………………………………………………………………...…IV MATERIALS AND PROCEDURES……………………………………….......V RESULTS…………………………………………………………………....….VI CONCLUSION……………………………………………………….….….…VII BIBLIOGRPAHY……………………………………………………….….……VIII RESEARCH The potato is a starchy‚ tuberous crop from the perennial Solanum tuberosum of the Solanaceae
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reaction occurred |(-) no reaction | |Pb(NO3)2 |Zinc itself turned glittery |the sliver of magnesium. | | | | |(+) the liquid looks |(+) There was also a black |(+) The copper almost looks |(+) the balls of lead turned| |AgNO3 |ash-like and the Zinc turned|spot that appeared on the |like fuzz grew on it |black and look fuzzy and
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of the percent copper and zinc in pennies based on density measurements. 7. Record laboratory data and observations. MATERIALS: Erlenmeyer Flasks o 125 mL o 250 mL beakers o 100 mL graduated cylinders o 10 mL o 25mL Burette o 50 mL Volumetric pipettes o 10 mL Measuring pipet o 10 mL Burette clamp and stand Various liquids and solids for density determination measurements o Liquids Distilled water Heptane Carbon Tetrachloride o Solids Pennies Copper Zinc Lead Aluminum
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THE MOLE CONCEPT References : Mohammed and Lambert ( Old Edition) Chapter 11 pg. 107 Mohammed and Lambert ( New edition) Chapter 8 pg 123 Anne Tindale Chapter 10 pg 46 The following topics will be covered : 1. Definition of Relative Atomic and Relative Molecular Masses. 2. Calculation of Relative Molecular Masses 3. Converting Moles to Grams / Grams to Moles 4. Calculation from equations Masses of substances /Volumes of gases / Concentration
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