Science Assignment | March 22 2013 | Jessica Finney | Ms Croaker – Sc743A | Science Part A Assignment Choose one scientist involved in formulating the modern periodic table and describe why their work made a significant contribution to the development of the periodic table. Dmitri Mendeleev’s contribution to the modern day periodic table is widely renowned in the history of chemical science. Mendeleev was the creator of the periodic table; arranging 63 known elements in order of their
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What happens? For many reactions involving liquids or gases‚ increasing the concentration of the reactants increases the rate of reaction. In a few cases‚ increasing the concentration of one of the reactants may have little noticeable effect of the rate. These cases are discussed and explained further down this page. Don’t assume that if you double the concentration of one of the reactants that you will double the rate of the reaction. It may happen like that‚ but the relationship may well
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CHAPTER 5: PERIODIC TABLE Development of the Periodic Table • i) Substance exist: naturally in elemental form Example: Gold‚ Uranium as unstable compound Example: Radioactive compounds as stable compound (majority) How to know whether a substance is a compound OR an element? ii) iii) • • • Grouping system: 1800: 31 elements identified 1865: 63 elements identified Audi Majdan – DMC 101 – KLIUC 1 • Dmitri Mendeleev: i) ii) iii) iv) Develop a system to group
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Our antibody selection guide makes picking the right combination of antibodies easy. It takes into consideration the specimen species‚ the host species‚ the desired level of specificity‚ and cross-reactivity concerns‚ among other factors. The antibody selection guide will lead you to the best options for single-purpose antibodies or those that you will use in multiple applications. The right combination of antibodies targeted to strategic epitopes will
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Introduction Reactive oxygen species (ROS) include super oxide ion (O2-)‚ hydrogen peroxide (H2O2) and hydroxyl radical (HO- ) are the causative agents to produce oxidative stress. ROS are produced by two independent pathways: mainly the mitochondrial oxidative metabolism and cellular responses to bacterial invasion‚ xenobiotic and cytokines. To counteract the formation of ROS‚ a number of antioxidant proteins have been described. These proteins are superoxide dismutase‚ catalase‚ glutathione peroxidase
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| Tuesday 1:30 | 2/28/2012 | | Introduction This experiment explores the reactivity pattern for the addition of Grignard reagents to three different carbonyl groups: a ketone‚ an ester‚ and a carbonate. Grignard reagents are organometallic compounds that have a carbon-metal bond‚ such as carbon-magnesium. Grignard reagents are formed from the reaction of an alkyl‚ cycloalkyl‚ or aryl halide and magnesium metal in dry ether. The reaction is shown below in figure 1. Figure
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protons and neutrons Writing and balancing chemical equations 1. Check for diatomic gases and place the subscript 2 (N‚ O‚ F‚ Cl‚ Br‚ I‚ H) 2. Balance formulas of compounds and place c 3. Conservation of atoms (both sides should have equal # of ions of each element) 4. Law of conservation of mass (both sides should have equal mass) Isotopes 2 or more forms of the same element that differ in their mass number because they have different numbers of neutrons in their nuclei (atomic # will still
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reaction. 9. When alkyl halides react‚ rearrangements are likely to occur in which of the following type(s) of reaction(s)? A) SN1 B) SN2 C) E1 D) Both SN2 and E2 E) Both SN1 and E1 10. Which of the following compounds would react fastest in an E1 elimination reaction? 11. Which of the following compounds is a tertiary alcohol? 12. Which of the following statements is (are) true about an SN2 reaction? A) The reaction is fastest with 1° halides. B) The reaction follows
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Q.8 An alkoxide is a stronger base than hydroxide ion. Justify. Q.9 (a) State the law which helps to determine the limiting molar conductivity of weak electrolyte. (b) Calculate limiting molar conductivity of CaSO4 (limiting molar conductivity of calcium and sulphate ions are 119.0 and160.0 S cm 2 mol -1 respectively). Q.10 Rate constant K for first order reaction has been found to be 2
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alpha-hydrogen atoms‚ which are the hydrogen’s on carbons directly attached to the carbonyl carbon. While most carbonyl functional groups share these two properties‚ within the carbonyl family of compounds‚ there are significant differences in reactivity. Aldehydes are generally more reactive than ketones and more easily oxidized. Carbonyls directly bonded to aromatic groups are generally less relative than Carbonyls that are directly bonded to alkyl substituents. In this experiment‚ we
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