Topic C3: Chemical Reactions; Flash Questions 0.0 / 5 ? ChemistryChemical ReactionsGCSEOCR Created by: MiriamLCreated on: 13-04-20 14:59 What can happen during a reaction of a non-enclosed system? Substances can enter or leave a reaction 1 of 44 What does this mean for the mass of the reaction mixture? It changes 2 of 44 How can you measure one mole of a substance? Using its mass 3 of 44 What does one 1 mole of a substance have the same mass in grams as? The relative formula mass of that substances 4 of 44 Mass= moles*relative formula mass 5 of 44 moles = mass/relative formula mass 6 of 44 What is the first step in a mole question? Calculate the relative formula mass of each substance 7 of 44 What the process of moles questions? Mass given ---> (mole=mass/mr) moles of given --->(chemical equation) --->moles of given--->(mass = moles*mr)---> mass of unknown 8 of 44 What type of reaction is breaking bonds? Endothermic (energy has to be absorbed) 9 of 44 What type of reaction is making bonds? Exothermic (energy is released) 10 of 44 In an exothermic reaction more energy is released when bonds are made than what? Than is absorbed when bonds are broken 11 of 44 In an endothermic reaction what do the products have more energy than? The reactants 12 of 44 In an exothermic reaction what do the products have less energy than? The reactants 13 of 44 What do H+ ions make a solution? Acidic 14 of 44 What do OH- ions make a solution? Alkali 15 of 44 What can ph be measured using? Using universal indicator or a pH probe 16 of 44 What happens to the concentration of H+ ions as you go down the pH scale? It becomes 10x greater 17 of 44 What is the equation for neutralisation? Acid + base --> salt + water 18 of 44 How do you predict the salt made in neutralisation? Take the metal from the alkali and the second part is the acid used 19 of 44 Reaction of acids in metals? Metal + Acid ---> Salt + Hydrogen 20 of 44 Reaction of acids in carbonates? Carbonate + acid ---> Salt + Water + Carbon Dioxide 21 of 44 Reaction of acids in alkalis/acids? Alkali + Acid ---> salt + water 22 of 44 What is the ionic equation for neutralisation? H+ + OH - ---> H2O 23 of 44 What will acids with a high concentration of particles per dm3 have more particles than? A dilute acide 24 of 44 What happens when acids dissolve in water? The H+ ions dissociate from the acid 25 of 44 What is a strong acid? Fully ionised so all molecule lose (produce or donate) hydrodgen ions 26 of 44 What is a weak acid? Partially ionised so only some of the molecules lose (produce or donate) hydrogen ions 27 of 44 What is pH linked to? Hydrogen ion concentration 28 of 44 If ph goes down by 1 what happens to the concentration of H+ ions? Goes up by a factor of 10 29 of 44 An acid with a higher concentration will have a lower pH than what? A dilute acid 30 of 44 A stonger acide will have a lower pH than what? A weaker acid 31 of 44 During electrolysis what happens at the cathode? The positive ions gain electrons and become atoms 32 of 44 During electrolysis what happens at the anode? The negative ions lose electrons and become atoms 33 of 44 What are half equations used to show? When an atom becomes an ion or an ion becomes an atom. It shows what is happening to only one elecemnt in a reaction 34 of 44 What is water naturally? Partionally ionised 35 of 44 What happens at the cathode in Electrolysis of Aquaeous Solutions? H+ ions are discharged and it produces hydrogen gas 36 of 44 What happens at the anode in Electrolysis of Aquaeous Solutions? OH- ions are discharged and it porduces oxygen gas and water 37 of 44 What are the reactions of the ions? Complete 38 of 44 How many things are produced at each electrode? One 39 of 44 What is produced at the cathode? Hydrogen unless the other metal ion is less reactive 40 of 44 What is produced at the anode? Oxygen unless the other negative ion is from group 7 then that is produces instead 41 of 44 In electroplating what is the cathode? The object you want to coat 42 of 44 In electroplating what is the anode? The piece of metal you want to coat the object with 43 of 44 In electroplating what is the electrolyte? A solution containing ions of the coating metal 44 of 44
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