polarity of water molecules results in hydrogen bonding. A hydrogen bond forms when the oxygen of one water molecule is electrically attracted to the hydrogen of a close molecule. Hydrogen bonding between water molecules is the basis for water’s unusual properties. Organisms depend on the cohesion of water molecules. Hydrogen bonding makes water molecules stick to each other‚ and this cohesion helps pull water upward in the microscopic vessels of plants. Hydrogen bonding is also responsible for water’s
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moles of carbon dioxide are produced when 10.0 moles of propane are burned in excess oxygen on a gas grill? C3H8 + 5O2 → 3CO2 + 4H2O 4. mole-mass problem: Water decomposes to produce hydrogen gas and oxygen gas. How many grams of water would be required to produce 10.0 moles of hydrogen gas? 2H2O → 2H2 + O2 MMH2O = 18.015 g/mol 5. mass-mole problem: If 25.0 grams of carbon dioxide are used in photosynthesis how many moles of glucose (C6H12O6) could be Produced according
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naturally occurring elements‚ only 17 of them make up 99.5% of the earth’s crust (including oceans and atmosphere). - In living things (plants‚ animals‚ people) the six most abundant elements are carbon‚ hydrogen‚ oxygen‚ nitrogen‚ phosphorus and sulfur. - The universe is dominated by the elements hydrogen (83%) and helium (16%) 1. The Crust The outside of the earth is a thin crust which is approximately 20 to 40km thick. The crust is a formation of dips and hollows which are filled with water
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|Chemistry Review 1 |TEACHER ANSWER KEY | | |June 06‚ 2011 | | | |’see explanation below’
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to which electrons are shared between two atoms. 3. Which of the following statements best sums up the number of covalent bonds that can be formed by the four most common atoms in living things? 4. Which linking verb phrase would best connect the hydrogen bonds term in the map to one of the other terms? 5. Which of the following statements most accurately describes the relative positions of the shared electrons in methane (CH4) and ammonia (NH3)? 6. About twenty-five of the ninety-two natural elements
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electricity through the solution used in electrolysis. During electrolysis‚ positive and negative electrodes are needed. The positive electrode (anode) experiences oxidation (loses electrons and hydrogen‚ gains oxygen) ‚ where the negative electrode (cathode) experiences reduction (gains electrons and hydrogen‚ loses oxygen). In our daily lives‚ we can see the applications of electrolysis in many ways. The process of electrolysis is used for accumulators (car batteries)‚ electroplating (the covering
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found in each of the large biomolecules (carbohydrates‚ proteins‚ lipids‚ nucleic acids). The SPONCH elements are Sulfur‚ Phosphorus‚ Oxygen‚ Nitrogen‚ Carbon and Hydrogen. These are the five key elements that compose living things. The four most frequently occurring of the SPONCH elements are‚ carbon‚ hydrogen‚ nitrogen and oxygen. Carbon is found in each of the large biomolecules. 2. Outline the difference between an atom and an ion. An atom has the same amount of
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Elements If God has any favorite elements‚ they must be Hydrogen‚ Carbon‚ Nitrogen and Oxygen. These four elements make up the majority of all Biological compounds. Without them‚ life on this planet as we know it could not exist. Due to the bonding possibilities between and among these elements‚ literally millions of organic compounds are possible. Carbon is the backbone of all organic compounds. It forms the main structure of the molecule with Hydrogen‚ Nitrogen‚ Oxygen and occasionally other elements
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GROUP B MODEL ANSWER Yoshida et al.‚ Flexibility of Hydrogen Bond and Lowering of Symmetry in Proton Conductor‚ Symmetry 2012‚ 4‚ 507-516. DO NOT PLAGIARISE THIS MODEL ANSWER PLAGIARISM FROM ANY SOURCE AUTOMATICALLY LEADS TO A ZERO SCORE Paragraph 1 M3H(XO4)2 compounds are used for electrolytic fuel cells (where M=K‚ Rb ‚Cs; X=S‚ Se). At different temperatures‚ the compound exhibits different degrees of symmetry. There are 3 distinct phases observed. Below 369K‚ the phase 3 structure belongs
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bronsted-lowry theory is an addition to the Arrhenius theory which defines acids and bases there are many reactions that occur in solvents or without any solvents at all rather than water. The reaction between hydrogen chloride and ammonia can be used to explain it. In aqueous solution‚ hydrogen which is an acid reacts with ammonia‚ a base to form a solution of the salt: ammonium chloride. According to Arrhenius the reaction occurs between the H+ ions formed due to the ionisation of the HCl when it
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