SYLLABUS Cambridge O Level Chemistry 5070 For examination in June and November 2014 University of Cambridge International Examinations retains the copyright on all its publications. Registered Centres are permitted to copy material from this booklet for their own internal use. However‚ we cannot give permission to Centres to photocopy any material that is acknowledged to a third party even for internal use within a Centre. © University of Cambridge International Examinations 2011 Contents
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amounts are unknown. By determining the percent composition of various elements and compounds in the unknown‚ its true identity can be predicted. Chloride‚ ammonia‚ and cobalt are three examples of percent compositions determined to help narrow the selection of possible unknowns. Titrations using Na2S2O3 and HCl to determine percent cobalt and ammonia‚ respectively‚ are used. Silver nitrate is used to precipitate the chloride ions in the unknown‚ which can be measured to determine the percent composition
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Homeostasis literally means “same state” and it refers to the process of keeping the internal body environment in a steady state‚ when the external environment is changed. The importance of this cannot be over-stressed‚ as it allows enzymes etc to be ‘fine-tuned’ to a particular set of conditions‚ and so to operate more efficiently. Much of the hormone system and autonomic nervous systems is dedicated to homeostasis‚ and their action is coordinated by the hypothalamus. In Module 2 we saw how
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shows how the atoms are bonded in ammonia. H N H H 1 (a) 1 (a) (i) Draw a ring around the correct answer. The formula of an ammonia molecule is NH3 N3H NH3 (1 mark) 1 (a) (ii) The particles represented by the dots () and crosses (x) in the diagram are electrons neutrons protons (1 mark) 1 (a) (iii) The bonds between the nitrogen and hydrogen atoms in ammonia are covalent ionic metallic (1 mark) (02) G/J68916/Jun11/CHY2F 3 1 (b) Ammonia is made by reacting nitrogen with
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Subject: Chemistry Topic: The Periodic Table The periodic table is a classification of all the elements based on ATOMIC NUMBER. It is composed of HORIZONTAL PERIODS and VERTICAL GROUPS which contain the elements arranged: *the order of INCREASING ATOMIC NUMBER *in the relation to the ELECTRON STRUCTURE of the atoms *in the relation to their CHEMICAL PROPERTIES (Criteria Used For Placing ELEMENTS in the Periodic Table) 1. ATOMIC NUMBER 2. NUMBER OF SHELLS (PERIOD) 3. NUMBER OF OUTER
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-----------------------Several Stand and Clamp ---------------------------------------------------------------------------------1 Chemicals: Magnesium sulphate-7-hydrate--------------------------------------------------------------18g 2.0M ammonia solution-------------------------------------------------------------------500cm3 75% propanal-2-ol----------------------------------------------------------------------------20cm3 Distilled water--------------------------------------------------------------------------------a
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of 1.32. The chart below shows our absorption rates: We then went on to part two‚ where we used the optimal wavelength to determine a calibration curve for the absorbance of Cu(NH3)42+. We took varying levels of a Cu2+ solution and added it to ammonia an looked at the absorbance amounts‚ which are seen in the below graph: With parts one and two of our lab complete‚ we now know the optimal wavelength to measure absorption at and we have determined absorption levels of Cu(NH3)42+. Being that we
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substituted as the solvent‚ neither of these acids undergoes complete dissociation Many solvents are proton donors or proton acceptors and can thus induce basic or acidic behavior in solutes dissolved in them. For example‚ in an aqueous solution of ammonia‚ water can Acetic acid acts as a differentiating solvent toward donate a proton and thus acts as an acid with the two acids by revealing inherent differences in respect to the solute: their acidities. Water on the other hand is a leveling solvent
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applications and a host of services for its customers. The company can offer unlimited quantities of bulk butane‚ propane and any composition of LPG with the online blending facility. The company is leading supplier of anhydrous ammonia‚ liquor ammonia and packed ammonia in cylinders. Kindly highlight the structure of the Eastern Gases business model. Answer: Step one in building a successful business is to learn what products or technologies your customers really need and are willing to
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added to food to keep them preserved and protects against mold. It is also used in photography- It allows the pictures to lighten in a dark room. Also have searched on Three examples of alkaline they are as follows: NaOH (Sodium Hydroxide)‚ NH3 (Ammonia) and KOH (Potassium Hydroxide). : NaOH is used for mostly to clean. Like drains. NH3 is mainly used for vehicle fuel‚ textile or even a poison treatment. And last but not least KOH‚ this alkali is used for food preparation‚ medical test and etc. I
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