This molecular compound forms hydrogen bonds with particular molecules and separate ionic lattice. Because it is a polar compound‚ it can be a good solvent. Because of the fact that water is a polar molecule with an electrical dipole moment‚ it can form four hydrogen bonds‚ leading to strong attractive forces between molecules of water‚ giving H2O a high surface tension. INCLUDEPICTURE http//chemlabs
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newspapers or news broadcasts. One of the most concerning pollutant in the Hudson River is polychlorinated biphenyls (PCBs). According to the US Environmental Protection Agency : PCBs are a group of man-made organic chemicals consisting of carbon‚ hydrogen and chlorine atoms. The number of chlorine atoms and their location in a PCB molecule determine many of its physical and chemical properties. PCBs have no known taste or smell‚ and range in consistency from an oil to a waxy solid. PCBs belong to
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magnesium and calcium. Copper is instead in group 11 and has very different chemical properties compared to magnesium and calcium. Hydrochloric acid is an acidic compound with the chemical formula HCl. A hydrochloric acid molecule consists of a hydrogen atom H and a chlorine atom
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Amrita VISHWA VIDYAPEETHAM (University established u/s 3 of UGC Act 1956) Amrita Entrance Examination – Engineering PHYSICS‚ CHEMISTRY & MATHEMATICS Question booklet Version Code Question booklet no. Number of pages Number of questions Time 120 : 3 hrs Max. Marks : 360 Registration number Name of the candidate Signature of the candidate INSTRUCTIONS TO THE CANDIDATES GENERAL 1. Any malpractice or attempt to commit malpractice in the examination hall will lead
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E XPE RIME NT 4 . 5 Reactions of acids Aim To investigate and compare some reactions of a strong acid‚ hydrochloric acid‚ and a weak acid‚ ethanoic acid (common name‚ acetic acid) Equipment Dropper bottles containing: • 0.1 M hydrochloric acid‚ HCl • 0.1 M ethanoic acid (acetic acid)‚ CH3COOH • 0.1 M sodium hydroxide‚ NaOH • 1 M hydrochloric acid‚ HCl • 1 M ethanoic acid (acetic acid)‚ CH3COOH • universal indicator solution • limewater (calcium hydroxide‚ Ca(OH)2) Marble chips (calcium carbonate
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GRADE 11 CHEMISTRY (30S) Final Practice Examination Answer Key GRADE 11 CHEMISTRY (30S) Final Practice Examination Answer Key IInstructions The final examination will be weighted as follows Modules 1–3 Modules 4–6 The format of the examination will be as follows: Part A: Fill-in-the-Blanks Part B: Multiple Choice Part C: Short Answer Total Marks Include units with all answers as required. Useful Information You will need the following in order to complete this examination: n n n n 15–20% 80–85%
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IGCSE Complete Chemistry Notes Unit 1: States of matter Everything is made of particles. Particles in solid are not free to move around. Liquids and gases can. As particles move they collide with each other and bounce off in all directions. This is called random motion. In 2 substances‚ when mixed‚ particles bounce off in all directions when they collide. This mixing process is called diffusion. It’s also the movement of particles without a force. The smallest particle
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Dana Leamaster February 13‚ 2013 Informative Speech: The Big Bang Theory How did the universe begin? How did matter come to exist? We all know that the universe exists‚ however‚ this knowledge alone has not satisfied mankind’s quest for further knowledge and understanding. Much time has been spent looking for some clues. Most of what we know is still only a speculation. The three topics I’d like to discuss are what exactly the Big Bang theory is‚ the first atoms‚ and the age of
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has a high specific tension and water molecules have cohesive forces holding them together‚ due to hydrogen bonding between water molecules. This allows water to be pulled through xylem in plants. It is also a transport medium‚ just like in animals‚ substances‚ such as ions are dissolved in it and carried in the xylem. Hydrogen bonds are formed between the oxygen of one water molecule and the hydrogen of another. As a result of this‚ the water molecules have an attraction for each other known as cohesion
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of a black oxide of copper‚ 6. 49g of a black oxide‚ on [3] reduction with hydrogen‚ gave 5.192g of copper. Show that these figures are in accordance with law of constant proportion? 12. A compound was found to have the following percentage composition by mass Zn = 22.65%‚ S = 11.15%‚ H = 4.88%‚ O = 61.32%. The relative molecular mass is 287g/mol. Find the molecular formula of the compound‚ assuming that all the hydrogen in the compound is present in water of crystallizations. Material downloaded
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