be which of the following? N2(g) + 3H2(g) 2NH3(g) + 94 kJ a. 6.8 d. 8.8 b. 6.4 e. 9.2 c. 8.6 ____ 5. A closed flask contains this equilibrium 2 NO2(g) (brown gas) N2O4(g) (colourless gas) When the equilibrium is heated at a constant pressure it gets browner. This must mean which of the following? a. Ke is very large d. both a and b b. it is endothermic e. both a and c c. it is exothermic ____ 6. Which equilibrium shows a decrease in [products] when the volume
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Experiment 1: "A cis to trans conversion" Saturday‚ June 25‚ 2005 4:19 PM Notes on Theory • Alkenes o They are hydrocarbons with a C=C double bond • Double bonds are stronger and more reactive than single bonds o Hydrocarbons with double bonds used to be known as "olefins"‚ because they had an oily appearance • "Oleum" means oil • "Ficare" means make • Isomers o Geometric isomers have the same molecular formula‚ but a different geometric arrangement • They also have different physical properties
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Chemistry Stage 3 Standards Guide Exemplification of Standards through the 2010 WACE Examination Chemistry: Stage 3 Standards Guide 1 2010/33606 Copyright © Curriculum Council‚ 2011 This document—apart from any third party copyright material contained in it—may be freely copied‚ or communicated on an intranet‚ for noncommercial purposes by educational institutions‚ provided that it is not changed in any way and that the Curriculum Council is acknowledged as the copyright owner. Copying
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dilution affect the number of moles of a substance? * What is the general form of a rate law? Rate = k[A]order – what is an order? Can you solve for k given rate‚ [A]‚ and order of A?\ * What does a rate order of zero mean? Equilibrium Constants and Le Chatelier’s Priciple * What is Le Chatelier’s principle? What does it describe? * Be able to use chemical reactions to show Le Chatelier’s principle in action. Example question: The two different colored Co(II) complex ions‚ [Co(H2O)6]2+
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1874‚ Dresden‚ Germany- Salicylic acid was first made and sold as a pain-killer‚ but it caused severe irritation of the mouth‚ gullet and the lining of the stomach. Salicylic acid (2-Hydroxybenzoic acid) 1875- Chemists made sodium salicylate for doctors to try on patients. It was found to have fewer
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expect for a 1.50 cm3 sample of pure tin? About 6.7 g c. What mass would you expect for a 0.20 cm3 sample of pure tin? About 1.3 g Logger Pro graph. 2. Students calculate the rate of reaction using several different concentrations of acid. When the rates are reported in scientific notation it is important to make sure that all the values on the rate axis are report to the same power of ten. You may have to make all the values times ten to the fourth power to draw this graph. Don’t connect
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An investigation into the total acid content of assorted brands of lemon and lime soft drink Abstract: The aim of this experiment was to determine the total levels of carbonic acid concentration in 3 differing brands of lemon and lime soft drinks. Research Question: Does the acid content in three different lemon and lime flavoured soft drink brand differ significantly? The purpose of this investigation is to calculate the total acid content within different brands of lemon
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reacts with dilute acids. Planning What I am going to do I am going to find out how much heat is given out when magnesium reacts with a variety of dilute acids. In order to make comparisons between the acids‚ I shall use my results to work out how much heat would be given out if 1 mole of magnesium reacted with an excess of each acid. The acids I shall use are hydrochloric acid‚ sulphuric acid‚ nitric acid and ethanoic acid. What I already know Magnesium reacts with most dilute acids to give a magnesium
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ACIDS USES acetic acid food preservation and preparation‚ when in solution with water it is known as vinegar acetylsalicylic acid pain relief‚ fever relief‚ to reduce inflammation‚ known as aspirin ascorbic acid antioxidant‚ vitamin‚ also called vitamin C Carbonic acid carbonated drinks‚ involved in cave stalactite and stalagmite formation and acid rain Hydrochloric acid digestion as gastric juice in stomach‚ to clean steal in a process known as pickling‚ commonly called muriatic
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Any strong acid will release approximately - 57 kJ/mol of energy on neutralisation with strong base. This energy release is due to the formation of water molecules from the H+ ions from the acid reacting with the OH- ions from the base. H+(aq) + OH-(aq) H2O(l) When a weak acid is neutralised some of the energy is needed to dissociate the molecules to make the hydrogen ions available for neutralisation. The result is a value for neutralisation enthalpy lower than - 57 kJ/mol (numerically
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