Topic 2 METALS What is this topic about? To keep it as simple as possible‚ (K.I.S.S.) this topic involves the study of: 1. OUR USE of METALS 2. CHEMICAL ACTIVITY of the METALS 3. PATTERNS of the PERIODIC TABLE 4. QUANTITY CALCULATIONS... the MOLE 5. METALS from their ORES ...all in the context of how Chemistry contributes to cultural development but first‚ an introduction... Chemistry of the Metals Technology Needs Metals In the previous topic you learnt about the Elements of the
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is negligible) (915.141 g) 4. A mixture of noble gases contains 4.46 moles of Neon and 0.74 moles of Krypton and y mole of Xenon at a pressure of 2 atm. (a) Determine y mole of Xenon if the partial pressure of Neon is 1.214 atm. (2.148 moles) (b) Determine the partial pressure of Krypton. [Sep 2014] (0.2 atm) 5. Calculate the number of moles of sulfur dioxide gas‚ SO2‚ transported in a 2 L container at s.t.p. (0.089 mole) 6. Water has a vapour pressure of 24 mm Hg at 25 °C and 182 mm Hg at
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The aim of this experiment was to calculate the concentration of an unknown solution of Sodium Hydroxide (NaOH) by titrating it with Hydrochloric Acid (HCl) and to identify any possible sources of error. A colour change from pink to yellow signified the end of each individual titre as the NaOH had been neutralised. Experimental: Method: Firstly two solutions were prepared to show the colour of the Phenol Red indicator in acid and alkaline conditions. These colours were then used to determine the
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the solution is raised. Thus‚ a 0.1 M acetic acid solution has a pH of 2.87 but a solution of 0.1 M acetic acid and 0.1 M sodium acetate has a pH of 4.74. Thus 4.74 is the pH of the buffer. On addition of 0.01 mole NaOH the pH changes from 4.74 to 4.83‚ while on the addition of 0.01 mole HCl the pH changes from 4.74 to 4.66. Obviously the buffer solution maintains fairly constant pH and the changes in pH could be described as marginal. Buffer Action: A buffer solution containing equimolar
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the hydrogen gas produced was calculated using Dalton’s Law of partial pressure. With this partial pressure value along with known values in the experiment the number of moles of hydrogen gas produced could be calculated using the ideal gas law equation and this experimental value was compared to the theoretical number of moles that should have been produced in the reaction. It was found that the average comparison value between the theoretical value and the experimental value was 97.8% with a standard
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(AlK(SO4)2 ∙ 12H2O). These tests like the process of filtration heating the solution will reveal things such as melting point‚ percent hydrate‚ as well as percent sulfate. After the experiment‚ the experimental mole ratio of alum to water will be calculated and then compared with the accepted mole ratio. (This is 12 to 1). Theory If this lab if conducted properly‚ the unknown substance will be determined to be alum because of melting point‚ percent hydration and percent sulfate. The first test that
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The number of people diagnosed with cancer is increasing from year to year. When it comes to women‚ their biggest threat is breast cancer. According to the American Cancer Society at the end of 2016 there will be 246‚660 new cases of breast cancer among American women‚ and that around 40‚450 of those women will probably die from breast cancer. What the experts from the American Cancer Society also stated is that one in eight women in the U.S. are going to develop invasive breast cancer during their
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KHC8H4O4 (aq) + NaOH (aq) KHC8H4O3 - Na+ (aq) + H2O (l) Average volume of NaOH titrate used = ½ (5.00 + 5.00) = 5.00 cm3 No. of moles of KHC8H4O4 reacted = 0.01 × 0.05044 = 5.044 x 10-4 mol From the equation‚ mole ratio of NaOH ≡ KHC8H4O4 is 1:1‚ No. of moles of NaOH reacted = 5.044 x 10-4 mol
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EXPERIMENT 3 Name: Flame Tests & Electron Configuration Pre-Laboratory Questions and Exercises Due before lab begins. Answer in the space provided. 1. Write electron configuration for the alkali metals Li‚ Na‚ K‚ and Rb. Li ____He 2s1_____________________________________________ Na ____Ne 3s1______________________________________________ K _______Ar 4s1___________________________________________ Rb _______Kr 5s1___________________________________________ 2. Write the electron configuration
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Aim: To Find and test the Iron content in different food sources INTRODUCTION: A Redox titration was used in order to perform this experiment. Reduction/oxidation (redox) process occurs when electrons are transferred from a donor species (the reducing agent) to another acceptor species (the oxidizing agent). It happens between an analyte and a titrant. A redox titration is done just as a normal titration is done‚ however instead of titrating an acid against a base‚ an oxidizing agent is titrated
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