Directions: The following questions involve more practice with radioactive decay half-life. Complete the problems to the best of your ability. This assignment is due by next WEDNESDAY‚ November 16th. 1. If 100.0 g of carbon-14 decays until only 25.0 g of carbon is left after 11 460 y‚ what is the half-life of carbon-14? a. Calculate how many half-lives have passed during the decay of the 100.0 g sample. 100 grams/2 50 grams/2 25grams…2 half lives have passed b. Solve for the half-life
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Worked solutions to student book questions Chapter 2 Analysis by mass Q1. a b Why was the soup sample in Worked Example 2.1 heated to 110°C? Why was it necessary to weigh the sample four times? A1. a b The soup was heated above 100°C to evaporate water from the sample. By repeatedly heating the sample until the mass remained unchanged‚ the analyst could be sure that all the water had been removed. Q2. Some laboratories use microwave ovens in place of conventional ovens to
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The Heat is about story of two brothers Carlos and Miguel or Michael (to his friends) Arroyo. Michael Arroyo has a pitching arm that throws serious heat. But his firepower is nothing compared to the heat Michael faces in his day-to-day life. Newly orphaned after his father led the family’s escape from Cuba‚ Michael’s only family is his seventeen-year-old brother Carlos. The Mimetic theory of this story is tell not only a great well driven story‚ but it is also tells a story of how it is to be an
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of this lab was to test the law of definite proportions for the synthesis reaction of combusting magnesium. In this lab‚ the polished magnesium ribbon was placed in covered crucible and was heated in order for it to react with Oxygen presented in air and in water provided. The result showed that Magnesium oxide formed through chemical reaction was made up of 60.19% magnesium and 39.81% oxygen‚ which is approximate proportion of both particles in every Magnesium oxide compound. From this lab it can
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ENGLISH 9 IN THE HEAT OF THE NIGHT UNIT ASSIGNMENT Introduction: The novel In the Heat of the Night was published in 1965‚ at the height of the civil rights movement in the United States‚ as African Americans struggled to obtain equal rights with White Americans. This struggle was long and difficult‚ and was marked by racial intolerance and violence of the worst kind. In 1967‚ with the civil rights struggle far from settled‚ the novel was adapted into a motion picture with the same title
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engine is a device which transforms one form of energy into another form. Most of the engines convert thermal engine to mechanical work and therefore they are called heat engine. Heat engine can be broadly classified into two types. i. Internal combustion engine ii. External combustion engine 1.1 CLASSIFICATION OF INTERNAL COMBUSTION ENGINE:- This type of engine is again classified into two types. i. Rotary ii. Reciprocating The reciprocating engine is a highly complex engine and has hundreds
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A heat detector is a fire alarm device designed to respond when the convected thermal energy of a fire increases the temperature of a heat sensitive element. The thermal mass and conductivity of the element regulate the rate flow of heat into the element. All heat detectors have this thermal lag. Heat detectors have two main classifications of operation‚ "rate-of-rise" and "fixed temperature." |Contents | |
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Heat transfer is a discipline of thermal engineering that concerns the generation‚ use‚ conversion‚ and exchange of thermal energy and heat between physical systems. Heat transfer is classified into various mechanisms‚ such as thermal conduction‚ thermal convection‚ thermal radiation‚ and transfer of energy by phase changes. Engineers also consider the transfer of mass of differing chemical species‚ either cold or hot‚ to achieve heat transfer. While these mechanisms have distinct characteristics
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Problems for heat integration 1. The stream data extracted from a specified section of a chemical process are given in Table 1 below. Table 1: Stream Data Stream Supply Temperature TS (oC) Target Temperature TT (oC) Heat Duty (MW) No Type H1 H2 H3 C1 C2 Hot Hot Hot Cold Cold 150 40 130 150 50 30 40 100 150 140 7.2 10 3 10 3.6 You are required to perform a heat recovery analysis for the plant section stated above. Given the Tmin for the
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CHM138LL Lab 5 Stoichiometry Analysis of a Chemical Reaction Name: A. Data Tables Item Measured/Quantity Calculated Mass (in grams) Iron nails (before reaction) 7.75g 5.5g Iron nails (after reaction) Mass of iron consumed 2.25g Initial mass of filter paper (before filtration) 0.86g 3.52g 2.66g Mass of filter paper and solid product Mass of solid product Show work below for “mass of iron consumed” and “mass of solid formed” calculations: 7.75g-5.5g=2.25g 3.52g-
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