is reported? a. 420 b. 424 c. 423.7 d. 423 e. 423.6 10. Double and triple bonds form because a. The atoms involved have high electronegativities b. Single covalent bonds do not give all the atoms in the molecule 8 valence electrons c. One of the atoms in the molecule has more than 8 valence electrons d. The ions involved have charges larger than 1 e. There is at least 1 hydrogen atom involved in the bond 11. Expressing the answer in scientific notation with proper significant figures
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M12/4/CHEMI/SP2/ENG/TZ1/XX/M MARKSCHEME May 2012 CHEMISTRY Standard Level Paper 2 13 pages –2– M12/4/CHEMI/SP2/ENG/TZ1/XX/M This markscheme is confidential and for the exclusive use of examiners in this examination session. It is the property of the International Baccalaureate and must not be reproduced or distributed to any other person without the authorization of IB Cardiff. –3– M12/4/CHEMI/SP2/ENG/TZ1/XX/M General Marking Instructions Assistant Examiners (AEs) will be contacted by
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01.23.13 NAS102 CODE13873 VSEPR Theory VSEPR (Valence Shell Electron Pair Repulsion) theory proposes that the geometric arrangement of terminal atoms‚ or groups of atoms about a central atom in a covalent compound‚ or charged ion‚ is determined solely by the repulsions between electron pairs present in the valence shell of the central atom. The number of electron pairs around the central atom can be determined by writing the Lewis structure for the
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PAHANG TRIAL 2009 EXAMINATION CHEMISTRY PAPER 2 MARKING SCHEMES SECTION A - Structural Questions: Question 1. (a) (i) The presence of isotopes 1M (ii) Let the abundance of 63X be a %. The % abundance of 65X. = ( 100 – a ) 1M Relative atomic mass = ( 62.93 x a) + ( 64.93 x ( 100 -a) ) 1M
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and S? H S a. - - b. - + c. + + d. + - 4. Which ionisation requires the most energy? a. Na(g) Na+(g) + e- b. Na+(g) Na2+(g) + e- c. Mg(g) Mg+(g) + e- d. Mg+(g) Mg2+(g) + e- 5. The bond enthalpies in kJ mol-1 for several bonds are given below: H – H 436 O – O 196 O = O 496 H – O 463 What is the enthalpy change‚ H‚ in kJ for the reaction below? 2 H2(g) + O2(g) 2 H2O(g) a. 442 b. 92 c. - 484 d. - 834 6. At 0oC‚ the mixture formed
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atoms. The electronegativity of the oxygen atom creates an unequal sharing of electrons between the O and H atoms of the molecule. This also gives water the ability to form hydrogen bonds between the slightly negative oxygen atom and the slightly positive hydrogen atom. Water has a high specific heat due to the hydrogen bonds. Because of this‚ water requires a large amount of energy to raise its temperature by just one degree. The polar nature of water allows the water molecules to attach to one another
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mole concept. 2. To illustrate and explain the structure of atoms based on Lewis and molecular orbital structure as well as generate electronic configurations for element. 3. To describe the type of chemical bonding (Ionic‚ covalent‚ dative covalent‚ metallic‚ hydrogen bond and van der waals force) formed between elements. 4. To understand the state of matter (solid‚ liquid and gasese) properties and solid lattice structure. 5. To describe on the kinetic theory of gas‚ gas law and deviation of
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carboxylic acids‚ and other compounds. A gringard reagent is an organic magnesium halide dissolved in a nonreactive solvent (like diethyl ether). The substance is made up of an organic group joined by a high polar covalent bond to magnesium‚ while magnesium is joined by an ionic bond to a halogen (like bromide) a gringard reagent will react with water‚ oxygen or almost any other electrophilic organic compound to produce alcohols‚ which makes it important in laboratories. Organometallic reagents
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molecule. Max Score: 5 Actual Score: 0 Question 9 Covalent bonds form when one atom _________ its _________ with another atom. Answer shares; electrons Comments Correct!! Max Score: 5 Actual Score: 5 Question 10 Water is an important solvent of life because Answer it forms hydrogen bonds. Comments Correct!! Max Score: 5 Actual Score: 5 Question 11 Carbon is such an important molecule for life because Answer it can form chemical bonds with a maximum of four other atoms. Comments Correct
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Bio 8.23.10 Chapter 1 Intro: The study of Life Properties of Life 1. Precise organization (Order) 2. Ability to take in energy and use it. (Energy utilization) 3. Ability to respond to stimuli ( Response to the environment) 4. Capacity for growth and development 5. Ability to reproduce 6. Ability to regulate internal environment (Homeostasis) 7. Ability to evolve ( Evolutionary adaptation) 8. Living organisms are cell based‚ made of one or more cells 9. Life
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