of an element [B: 10.01u] [B: 11.01u] 1) Given average atomic mass: 10.81u If given percentages‚ you can find average atomic mass by adding each portion 2) Set variables for unknown values Let x represent % abundance for 10/5 B Let 1-x represent % abundance for 11/5 B Calculate: 10.01x+(1-x)11.01=10.81 10.01x+11.01-11.01x=10.81 -1.00x=0.2 X=0.2 The Mole and Avogadro’s constant Mole: the SI unit that is used to measure how much of a substance. (balanced eqn coefficient are moles) Converting
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precautions All enzymes are potential allergens therefore eye and skin should be avoided Wear eye protection throughout the experiment and avoid rubbing eyes if the enzyme solution on hands in contact. Chemical Reagants Hydrogen peroxide solution (5-9 moldm-3) Materials / Equipment: Potato Cock Borer Test tube Knife Pipette Boiling tube Delivery tube Stopwatch Method: 1. 5.0cm3 of 2.0moldm-3 hydrogen peroxide solution is poured into tube 1. The bug is placed and followed by water
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Chapter 5 * Thirteen original colonies is misleading because Britain ruled thirty-two colonies in North America by 1775 * Included Canada‚ the Floridas‚ and various Caribbean islands * Only thirteen unfurled the standard of rebellion * A few of the nonrebels (Canada‚ Jamaica‚ etc) were larger‚ wealthier‚ or more populous than some of the revolting thirteen * Some British colonies had strike for their independence while others did not/; due to the distinctive social‚ economic
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C H A P T E R 5 Basic Concepts from Organic Chemistry 5.1 | INTRODUCTION The fundamental information that environmental engineers and scientists need concerning organic chemistry differs considerably from that which the organic chemist requires. This difference is due to the fact that chemists are concerned principally with the synthesis of compounds‚ whereas environmental engineers and scientists are concerned‚ in the main‚ with how the organic compounds in liquid‚ solid‚ and gaseous wastes
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solution and the alligator clips remain out of the solution. Note: The solution in the Petri dish top will serve as a control. 4. To start the demonstration‚ clip the 9-volt battery into the snaps on the battery cap (Figure 1). 5. Let the demonstration run for 5–10 minutes and note the changing colors over time and the production of gases (bubbling) at each electrode. A deep purple color forms immediately at the negative electrode‚ while at the positive electrode a red- orange color appears
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abulary Reading Strategies Vocabulary is very essential to the reading process as it is one of five core components that is essential to successfully teach children how to read. The other four core components include phonemic awareness‚ phonics and word study‚ fluency and comprehension (United States National Reading Panel‚ 2000). According to Rupley‚ Logan & Nicholas‚ 1998/99 in their book “Vocabulary instruction in a balanced reading program” stated that vocabulary knowledge is virtually vital
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Experiment 7 Gooch filter crucible or fritted-glass funnel Mother liquor- liquid from which a substance precipitates or crystallizes Filtrate- liquid that passes through the filter Slurry- suspension of solid in liquid Calcium ion can be analyzed by precipitation with oxalate in basic solution to form CaC2O4.H2O The precipitate is soluble in acidic solution because the oxalate anion is a weak base CaC2O4.H2O (calcium oxalate monohydrate ; MW = 146 g/mol) Equation: Ca2+(aq) + C2O42-(aq)
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1. (a) The diagram below represents the industrial fractional distillation of crude oil. (i) Identify fraction A. (ii) What property of the fractions allows them to be separated in the column? (2) (b) A gas oil fraction from the distillation of crude oil contains hydrocarbons in the C15 to C19 range. These hydrocarbons can be cracked by strong heating. (i) Write the molecular formula for the alkane with 19 carbon atoms. (ii) Name the type of reaction involved in cracking. (iii) Write
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4. (a) Place asterisks at all of the asymmetric carbon atoms in the molecule shown below (prostacyclin). (b) Based on the number of asymmetric carbons‚ how many stereoisomers of prostacyclin are possible? 5. Hydrogenation of an alkene will yield an alkane. The alkane formed by hydrogenation of (S)-4-methyl-1-hexene (I) is optically active‚ while the one formed by hydrogenation of (S)-3-methyl-1-pentene (II) is not. Explain. I II 6. Draw
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The vocabulary words I chose are beleaguered‚ which means to beset with difficulties and aghast defined as being filled with shock or horror. The reason they both apply is because in every example Gladwell has provided from David vs. Goliath to Boeis‚ Frereich‚ and Northern Ireland Protestants; all of the underdogs possessed the ability to cause shock their opponents‚ as well as they all start out with great difficulties that are overcome despite the odds being against them. Gladwell defines the
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