HKCEE Chemistry 2007 Paper 1 Section A 1. A is a compound formed from oxygen and magnesium‚ while B is a compound formed from oxygen and fluorine. a) Draw the electronic diagram of A‚ showing electrons in he outermost shells only. (1) b) Draw the electronic diagram of B‚ showing electrons in the outermost shells only. (1) c) Compare the melting points of A and B. Explains your answer. Melting point of A is higher than that of B. Ions of A are linked by strong ionic bonds /
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Flyaway Protein Damaged hair Herbal All purpose/dry pH balanced Chemically treated TLS-Pre perm Before perming Dry powder Use when unable to wash Brightening To lighten natural hair Colour Enhance natural colour Coal Tar Psoriasis Soapless Shampoo does not contain soap manufactured by sulphonation =vegetable oil + sulphuric acid TLS = Triethanolamine Lauryl Sulphate SLS = Sodium Lauryl Sulphate Contain no additives Used before perming Shampooing for Services before a perm before
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Section A (Answer ALL questions in this Section.) 1. Rubidium (Rb) and potassium belong to the same group in the Periodic Table. The relative atomic mass of rubidium is larger than that of potassium. (a) Explain whether rubidium is more reactive than potassium. (b) Write a chemical equation for the reaction between rubidium and water. (State symbols should be given.) (c) Suggest how rubidium can be stored safely in the laboratory. (d) Suggest ONE safety precaution for handling
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Carbon and Its Compounds Carbon: Introduction Atomic Number: 6 Electronic Configuration: 2‚ 4. Valence electrons: 4 Property: Non-metal Abundance:- Carbon is the 4th most abundant substance in universe and 15th most abundant substance in the earth’s crust. Compounds having carbon atoms among the components are known as carbon compounds. Previously‚ carbon compounds could only be obtained from a living source; hence they are also known as organic compounds. Bonding In Carbon:- The Covalent
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Assignments in Science Class X (Term II) 4 Carbon and its Compounds IMPORTANT NOTES 9. Unsaturated organic compounds : Organic compounds in which a double or a triple bond exists between two carbon atoms in a carbon chain‚ are called unsaturated organic compounds. 10. Hydrocarbons : Organic compounds which contain only carbon and hydrogen atoms are called hydrocarbons. 11. Straight chain hydrocarbons : Hydrocarbons‚ in which all the carbon atoms are linked to one another in a straight chain
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Project 17: Soaps and Detergents Stephanie Futrell Kelsey Duncan Tom Bunch Antwyone Clayborne Chemistry 1020 Laboratory‚ Section 007 Instructor: Fan Yang September 23‚ 2014 Our signatures indicate that this document represents our own work. Excluding shared data‚ the information‚ thoughts and ideas are my own‚ except as indicated in the references. Goals There was another oil spill that covered local birds in oil. The environmental group stepped in to help make their own soap
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The Effects of Household Detergent on Germination and Biomass Production of Pinto Beans and Radishes Introduction and Background: Plants are a diverse kingdom that gives vital sources of food‚ energy‚ and oxygen to sustain life on the planet. Plant classification is divided into four major groups including mosses and liverworts‚ ferns‚ conifers‚ and flowering plants. Plants we most commonly identify ourselves with is edible fruits and vegetables. There are a variety of types of vegetables from
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We used pond water‚ tap water‚ and well water to see if the products could dissolve in different kinds of water. The detergent and the soap were insoluble in normal tap water. However‚ they were both partially soluble in both well water and pond water. This is because the pHs of both well water and pond water are off from 7. We knew this because we had flame tested the
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Green as You Clean  Question: Are green detergents less toxic than conventional detergent and which has a greater affect on the environment? Background: Over the course scientist have conducted research and preformed experiments to examine the toxicity level of dish washing detergents. Thereby‚ even the simplest task of washing our dishes after meals can have an impact on the environment. The debate whether “green” or conventional detergents are environmentally safer then comes to question
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.............................................................................. 2 1.1. 2. Aim of the report .................................................................................................. 2 CONSUMER BEHAVIOUR ON PURCHASE OF DETERGENTS IN BRAZIL ................. 2 2.1. 2.2. Consumer decision Process ................................................................................. 2 Influences on consumer decision making .......................................................
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