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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I heated the solution to evaporate the water and I got a brownish-blackish solid called copper oxide. Once the solid appeared‚ I poured in sulfuric acid to it and I got copper sulfate‚ a bluish solution. The final step I took was to add the element zinc‚ which turned the solution from blue to clear‚ with a brown solid in the bottom of the beaker‚ copper. Observation: During each step‚ something happened. For instant‚ for the first step‚ when I added the acid to the copper‚ the copper disappeared
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barium sulfate‚ a white solid pigment and sodium chloride 2. As barium sulfate is insoluble in water it was relatively easy to observe and interpret what was happening as the chemicals mixed 2. The formation of zinc yellow also involved a double displacement reaction 3. The addition of zinc sulfate to potassium chromate formed a yellow coloured solution and when base was added‚ the solution turned into a bright yellow colour. This was difficult to observe as the colour change was very subtle‚ however
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Autism Can Be Successfully Treated For years they have been treating children with different physical problems such as: autism‚ learning disabilities‚ attention deficit disorder‚ hyperkinesis cerebral palsy‚ seizure disorders‚ etc. The effects on the family of any exceptional child can often be devastating. Families have been shattered by the experience. The effects on siblings are also overlooked. I have not been directly affected by this disease‚ but am very close to loved ones in which deal
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CHAPTER I Potatoes as Other Point of Supply for Batteries I. Background of the Study For the past few years‚ researcher Rabinowitch and colleagues have been pushing the idea of “potato power” to deliver energy to people cut off from electricity grids. As a resident living in the Philippines wherein most perilous typhoons happen‚ Filipinos experience tough challenges like the cut off of the electricity or most
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1O BEST FOOD 4 BETTER SEX People have been using natural aphrodisiacs for centuries to improve their sexual performance and experience. Nowadays supplements are more popular‚ but you can have better sex life without putting different chemicals in your body by just eating foods that we see every day around us. Asparagus Asparagus is considered to be one of the best foods to provide exceptional sex power. The key ingredient in Asparagus is folate. This substance helps in the production of histamine
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Experiment ENTHALPY AND ENTROPY OF ZINC WITH COPPER SULFATE The CCLI Initiative Computers in Chemistry Laboratory Instruction LEARNING OBJECTIVES The learning objectives of this experiment are to. . . ! ! determine changes in enthalpy and entropy of the reaction of zinc with copper sulfate using two methods: electrochemistry and calorimetry. compare the enthalpy values obtained by the two methods. BACKGROUND Thermodynamics is concerned with energy changes that occur in chemical and physical process
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1. The property of metals by which they can be beaten in to thin sheets is called- a. malleability b. Ductility c. conduction d. Expansion Ans . 1. (a) 2. Which one of the following is metal? a. C b. N c. Na d. O Ans . 2. (c) 3. Which one of the following is non metal? a. Zn b. Al c. Fe d. N Ans . 3. (d) 4. All materials shown property of malleability expect a. Iron b. Graphite c. Aluminium d. Silver Ans . 4. (b) 5. Which one of the following is a good conductor of electricity
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four metals from most reactive to least reactive is: zinc‚ iron‚ nickel‚ copper. Zinc is the most reactive. The reaction occurred quickly… small bubbles (hydrogen) appeared straight away. As the reaction continued‚ larger bubbles (more hydrogen) appeared. At the end of the experiment‚ the nail was completely rusted. Hydrogen displaced the zinc. Iron had no visible reaction after 1 hour‚ so there wasn’t as an immediate of a reaction as with the zinc. The reaction then escalated after four hours‚ and
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What is molar mass?Molar mass is the weight of one mole (or 6.02 x 1023 molecules) of any chemical compounds. Molar masses of common chemical compounds that you might find in the chemistry laboratory can range between 18 grams/mole for compounds like water to hundreds of grams per mole for more complex chemical compounds.The lightest possible chemical that one can have under normal conditions is hydrogen gas‚ or H2. There is no limit to how heavy a chemical compound can be - it is not uncommon for macromolecules (large
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