1. On analysis‚ a compound with molar mass 60 g mol–1 was found to contain 12 g of carbon‚ 2 g of hydrogen‚ and 16 g of oxygen. What is the molecular formula of the compound? A. CH2O B. CH4O C. C2H4O D. C2H4O2 2. What is the total number of atoms in 0.20 mol of propanone‚ CH3COCH3? a. 1.2×1022 b. 6.0×102 C. 1.2×1024 D. 6.0×1024 Assuming complete reaction‚ what volume of 0.200 mol dm–3 potassium hydroxide solution (KOH(aq))‚ is required to neutralize 25.0 cm3 of 0.200 mol dm–3 aqueous
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For the purpose of this essay the Kolb’s model of reflection (1984) has been chosen as a guide to reflect on administration of oxygen therapy. Administration of oxygen therapy is the aspect of nursing practice that I selected as a result of completing the case-based learning scenarios. I will explain how the administration of oxygen therapy can have an effect on a patient’s activities of daily living (ADL)‚ including some of the psychological and ethical issues. Breathing is the selected ADL that
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IGCSE Chemistry 2012 exam revision notes by Samuel Lees Contents: 1. The particulate nature of matter 2. Experimental techniques 2.1 Measurement 2.2 (a) Criteria of purity 2.2 (b) Methods of purification 3. Atoms‚ elements and compounds 4.1 Atomic structure and the Periodic Table 4.2 Bonding the structure of matter 3.2 (a) Ions and ionic bonds 3.2 (b) Molecules and covalent bonds 3.2 (c) Macromolecules 3.2 (d) Metallic bonding 3 Stoichiometry 4
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101 Week 1 Individual Assignment 02/08/2010 The Process of Science a. Chapter 2: Question 11 How might you use a radioactive isotope to find out whether the oxygen in CO2 comes from sugar or oxygen gas? I would substitute with a radioactive isotope of oxygen and run the reaction. Upon observation of the result‚ the oxygen came from what was used if the carbon dioxide is radioactive. If the carbon dioxide is not radioactive‚ then it came from the sugar. b. Chapter 3: Question 11
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widely distributed in dusts‚ sands‚ planetoids‚ and planets as various forms of silicon dioxide or silicates. Over 90% of the Earth’s crust is composed of silicate minerals‚ making silicon the second most abundant element in the Earth’s crust after oxygen. Uses Most silicon is used commercially without being separated‚ and indeed often with little processing of compounds from nature. These include direct industrial building-use of clays‚ silica sand and stone. Silica is used in ceramic brick. Silicate
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Oscar’s Life Changing Adventure 1. Intro – Once upon a time‚ there was an oxygen molecule named Oscar. Oscar was getting ready to go on the biggest adventure of his life‚ a trip through the respiratory system to become a carbon dioxide molecule. 2. Intro Extended – In order to start his adventure‚ Oscar must find a body to be breathed in by. Once he found a body that breathed him in‚ he faces the decision of choosing either to enter through the mouth or the nose. Oscar decides to enter through
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integration‚ is the respiratory system and the circulatory system. The respiratory system brakes down Oxygen (O) taken into the body. After this action has taken place‚ the Oxygen is then passed into the circulatory system to be transported around the body to provide cells with energy. This energy is called Adenosine triphosphate (ATP)‚ without this energy the body and its functioning would fail. After Oxygen has been distributed around the body the waste product Carbon Dioxide (C02)‚ is taken back to the
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dioxide (+energy released) It lets organisms live in places where there is little or no oxygen. Such places include deep water‚ soil‚ and the digestive tracts of animals such as humans. Plants If the roots of a plant get waterlogged they start to run out of oxygen too. So they need to use a different form of anaerobic respiration. glucose → ethanol + carbon dioxide (+ energy released) When no oxygen is present‚ plants can temporarily use anaerobic respiration to create energy. It is not as
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our planet as a spaceship then we are the new and all other species are passengers. In general we behave irresponsibly .Earth’s atmosphere forms a protective cocoon around our spaceship‚ storing and recycling essential elements such as carbon and oxygen. Humans fill the air with pollution that turns the rain acidic and threatens to alter the climate pollution from and fossil and nuclear fuels‚ from industry and agriculture is slowing poisoning not only in the air but also the land and water that
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byproducts such as in the bioconversion of corn into ethanol. Bioreactors supply a homogeneous (same throughout) environment by constantly stirring the contents. Bioreactors give the cells a controlled environment by ensuring the same temperature‚ pH‚ and oxygen levels. Types of Bioreactors • Batch: Media and cells are added to the reactor and it is run until a predetermined set point (i.e. time‚ concentration). The bioreactor has a constant volume (the initial volume). • Fed-Batch: The bioreactor
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