CHEMISTRY QUESTIONS 0.0 / 5 ? ChemistryOrganic and Green ChemistryGCSEAQA Created by: jp3louisCreated on: 14-06-16 19:37 Which ion causes PH's to be 2.9? Hydrogen 1 of 28 Write the equation for the reaction of zinc metal with sulfuric acid. Zn+H2SO4----- ZnSO4 + H2 2 of 28 Whats the equation to work out the relative formula mass of a substance in grams, known as one mole of that substance? number of moles = mass of g/mr 3 of 28 How do you work out the percentage mass of an element in a compound? Ar X number of atoms of the element you want/ Mr of the whole compound. 4 of 28 How do we work out empirical formula? List the elements, write there experimental masses, divide each one by Ar, Turn the numbers into a ratio. 5 of 28 how do you work out how to calculate a mass in a reaction? Write out the balanced equation, work out the Mr, divide to get one. 6 of 28 Whats the half equation for when zinc chloride is moved to the positive electrode? 2cl- ---------- cl2 + 2e- 7 of 28 Suggest why carbon nanotubes are used as lubricants. Nanotubes can slide as there are no bonds between the tubes. 8 of 28 Describe what happens when Magnesium ions (mg 2+) react with oxygen (o2-) to produce magensium oxide. Magnesium looses electrons due to oxidation. Oxygen gains electrons due to reduction. This makes a full outer shell. 9 of 28 Glass melts at a lower point than silicon dioxide. Why> Weaker bonds when more things are put together. 10 of 28 Give the formula of sodium oxide. Na2O 11 of 28 Describe the structure of a metal? Lattice of positive and negative bonds with delocalised electrons. 12 of 28 Name the gas produced when lithium reacts with water to produce a gas and an alkaline solution Hydrogen. 13 of 28 Which ion causes the solution to be alkaline in a reaction with lithium and water. Hydroxide. 14 of 28 Ethanoic acid is formed between a reaction of what? Ethanol and oxygen. 15 of 28 The alcohol used to make propyl ethanoate has the formula CH3Ch2CH2OH. Name this alcohol? Propanol (3 carbons) 16 of 28 An inside of a pan becomes coated with a white solid. Explain how this white solid is produced. Water contains calcium which decomposes to make calcium carbonate when heated. 17 of 28 Explain why a temperature of 450 is the optimum temperature for the harber process. More yield and more collisons. 18 of 28 Why do water filters at home contain particles of silver? To kill microbes. 19 of 28 Give the name of the carbonate in scaled. Calcium carbonate. 20 of 28 When acids react, a gas is produced. What is it Co2 21 of 28 Why does hydrochloric acid react faster than ethanoic acid? Lower PH so it ionises more. 22 of 28 WHy should we not use hydrochloric acid to dissolve scale in kettles? Corrosive. 23 of 28 WHy is a pressure lower than 200 not used for the harber process? Lower yield. 24 of 28 How is ammonia got from the harber process. It cools and liquidfies. 25 of 28 Describe a test to show that barium chloride solution contains chloride ions. Silver nitrate solution+ nitric acid = white precipitate. 26 of 28 Name the type of reaction between aqueous ammonia solution and an acid? Neutralisation. 27 of 28 Why is carbon dioxide a gas even at low temperatures? Simple molecular structure, these intermolecular forces are weak, so only need a small amount of energy to over come them. 28 of 28
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