water molecule consists of two hydrogen atoms and an oxygen atom‚ the oxygen atom has a partial negative charge‚ whereas the two hydrogen atoms have a slight positive charge. So‚ when water molecules are close together‚ their positive and negative regions are attracted to the oppositely-charged regions of nearby molecules‚ the attraction is called a hydrogen bond. Each water molecule can be hydrogen bonded to four others‚ because it can accept two and donate two hydrogen atoms. The fact that water is
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organic matter‚ compost‚ next being 3:2 soil and finally sedentary soil having the lowest pH of them all. The pH of soil pH is affected by both acid and base-forming ions. The acid forming cations are positively charged ions they commonly include hydrogen ions‚ aluminium ions ‚and iron(II and III ions). Base forming cations commonly comprise of calcium ions‚ magnesium ions‚ sodium ions and potassium ions. It is also known that the CEC is positively correlated with soil pH. As the dilution of the soil
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solutions formed due to intermolecular attractions between the solute and the solvent. A1. For Water-Soluble Compounds: Acetone – Water: Hydrogen bonding and van der Waals forces Acetone – Diethyl Ether: Dipole – (induced) dipole and van der Waals forces Sucrose – Water: Hydrogen bonding and van der Waals forces Ethyl alcohol – Water: Hydrogen bonding and van der Waals forces Ethyl alcohol – Dietheyl Ether: Dipole – (induced) dipole and van der Waals forces For Acidic Compounds:
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years six more plants were created on The Coromandel. Cyanide has been used all over the world to make the extraction of gold easier. Although cyanide is helpful in terms of recovering gold it has been used throughout history as a deadly poison. Hydrogen cyanide has been used to disinfect buildings and sodium cyanide was used for over 50 years to control coyote numbers in the US. Cyanide is an ion with a single negative charge formed between carbon and nitrogen. There is a triple bond formed between
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molecule is said to be “polar”? -Because the molecule is a bit like a magnet with two poles. 1b. How do hydrogen bonds between water molecules occur? -The attraction between a hydrogen atom with a partially negative charge. 2b. Why is water such a good solvent? -Because water easily dissolves salts‚ sugars‚ minerals‚ gasses and even other solvents. 3b. The acid hydrogen fluoride can be dissolved in pure water. Will the pH of the solution be greater or less than 7? -The
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the graphene sample to generate atomic hydrogen Inspired by the elegant idea to create graphane‚1there have been some efforts to decorate the graphene lattice with hydrogen atoms to transform it from a highly conductive zero-overlap semimetal into a nonzero gap semiconductor and thus tune its electric properties to suit wider practical applications.234 However‚ these attempts have been merely limited to cold hydrogen plasma treatment5 in which the hydrogen plasma bombardment also creates numerous
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Decreasing Fossil Fuels Over the past century America has continuously used its own fossil fuel resources and paid handsomely for additional supplies‚ in the race to stay current with modern technology and life .The possession of this resource has made the United States a very prosperous and powerful nation. The same fossil fuels that’s has made America such a powerhouse are the same that are damaging the environment and economy they have enabled. It is imperative that we decrease our dependency
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Chapter 1 Section 1 Anatomy-Study of internal and external structures of the body and the physical relationships among body parts Gross Anatomy -involves the examination of relatively large structures and features usually visible with the unaided eye Microscopic Anatomy-deals with structures that cannot be seen without magnification Physiology-the study of function and considers the functions of the human body Anatomy and physiology are closely interrelated Theroretically Practically Anatomical
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CSEC CHEMISTRY NOTES ON PERIODIC TRENDS From Chemistry for CSEC by Tania Chung-Harris and Mike Taylor Chemistry for CAPE by Susan Maraj and Arnold Samai Periodic Trends in Group II Elements in Group II The elements in Group II are called alkaline earth metals. Be‚ Mg‚ Ca‚ Sr‚ Ba‚ Ra Beryllium‚ Magnesium‚ Calcium‚ Strontium‚ Barium‚ Radium These elements bond by metallic bonds (intramolecular forces) to form giant metallic structures. The size of the
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two samples of hydrogen to contain the same number of atoms‚ yet have different weights? Exactly two atoms of hydrogen combine with one atom of oxygen. But individual atoms are far too small and too nomerous to be counted‚ so chemists use a unit called mole. 4. Define chemical bond and indetify several types of chamical bonds. Chemical bond - hold the participating atoms together once the reaction has ended. Three basic types of chemical bonds: ionic bonds‚ covalent bonds‚ hydrogen bonds. 5. Which
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