Practice Final Exam Version 2 Name___________________________________ Chemistry 201 (Eikey) Part 1: MULTIPLE CHOICE (48 points). Choose the one alternative that best completes the statement or answers the question. Record your answer on the scantron. Each question is worth 3 points. 1) A student weighed 30.00 µg of sulfur in the lab. This is the same mass as A) 3.000 × 10 4 ng. B) 3.000 × 10 -5 mg. C) 3.000 × 10 -8 g. D) 3.000 × 10 -5 kg. 2) 1) 2) A student performs an experiment to determine
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are small and are negatively charged (-) with a mass of almost 0 amu.. 4. Protons & neutrons are in an atom’s nucleus (nucleons). Which has the greatest number of nucleons? Sn-119 Sb-122 Te-128 I-127 5. Electrons are found in “clouds” (orbitals) around an atom’s nucleus. Where is most of the mass of an atom found? Where is most of the size (volume) of an atom found? 6. The mass number is equal to an atom’s number of protons and neutrons added together. What is the mass number
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Renewable and Sustainable Energy Reviews 5 (2001) 343–372 www.elsevier.com/locate/rser A review of absorption refrigeration technologies Pongsid Srikhirin *‚ Satha Aphornratana‚ Supachart Chungpaibulpatana Mechanical Engineering Program‚ Sirindhorn International Institute of Technology‚ Thammasat University‚ PO Box 22 Thammasat Rangsit Post Office‚ Patumthani 12121‚ Thailand Received 11 January 2001; accepted 12 February 2001 Abstract This paper provides a literature review on absorption refrigeration
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1.1 CHEMISTRY 2213a ORGANIC CHEMISTRY FOR THE LIFE SCIENCES - organic chemistry is the study of life at the molecular level; to many it is the key to understanding life “The language of chemistry- an international language‚ a language without dialects‚ a language for all of time‚ and a language that explains where we came from‚ what we are‚ and where the physical world will allow us to go” (Nobelist Arthur Kornberg‚ a biochemist‚ 2000) - but its study has been challenging for students for
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UNIVERSITY OF CAMBRIDGE INTERNATIONAL EXAMINATIONS General Certificate of Education Advanced Subsidiary Level and Advanced Level CHEMISTRY Paper 1 Multiple Choice Additional Materials: Multiple Choice Answer Sheet Soft clean eraser Soft pencil (type B or HB is recommended) Data Booklet 9701/13 May/June 2010 1 hour *2288633369* READ THESE INSTRUCTIONS FIRST Write in soft pencil. Do not use staples‚ paper clips‚ highlighters‚ glue or correction fluid. Write your name‚ Centre number and
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charges should reside on more electronegative atoms. 4 Examples: Drawing Lewis Dot Structures 1. Draw Lewis dot structures for the following molecules and ions. Show all lone pair electrons‚ and all formal charges that are not zero. a. CH4 b. NH3 c. H2O d. NH4+ e. HCN f. CO2
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light is called a packet. 9) Ultraviolet light produces suntans and sunburns. 13) Electrons behave like particles and we can describe their exact paths. 17) The ground state is when an electron in an atom is excited into the lowest possible vacant orbital. 21) Bromine has 17 valence electrons. 25) The atomic radius of lithium is larger than the atomic radius of nitrogen. Multiple Choice Questions 29) The number of cycles of a wave that passes a stationary point in one second is called its A) wavelength
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ions. Dot-cross diagrams show outer electrons only e.g. NaCl [pic][pic] ▪ Covalent bonding – A covalent bond is a shared pair of electrons. Only non-metals can get a full shell by sharing electrons. The bond is the attraction of the shared electrons for the two nuclei. Dot-cross diagrams show outer electrons only e.g. Cl2 [pic] ▪ In dative covalent bonds‚ one atom provides both of the shared pair of electrons e.g. formation of an ammonium ion‚ NH4+‚ from ammonia‚ NH3‚ and H+ [pic]
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Wavelength‚ frequency‚ and amplitude and energy. As a person in science‚ i should know the order of colours in the visible spectrum and the span of visible wavelengths. Question: if light is a .. Answer: max planck proposed that e.m radiation comes in units of defined energy rather than in any arbitrary quantities. Planck called it quantum The Photoelectric Effect Planck’s theories were used to explain a number of observations that had been troubling scientists. Einstein extended
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Assignment 1. Questions from chapters 1 and 2 of McMurry and Fay Question numbers are from the fourth edition. Chapter 1. Chemistry: Matter and Measurement 1 1.1 1.2 1.3 (a) Cd (b) Sb (a) silver (c) Am (c) rhenium (d) cesium (e) argon (f) arsenic (b) rhodium (a) Ti‚ metal (d) Sc‚ metal (b) Te‚ semimetal (e) At‚ semimetal (c) Se‚ nonmetal (f) Ar‚ nonmetal 1.4 1.5 The three Acoinage metals@ are copper (Cu)‚ silver (Ag)‚ and gold (Au). (a) The decimal point must be shifted
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