Energetics (Triple) quiz Loading... 1. What does this diagram represent?Energy level diagram for an exothermic reactionEnergy level diagram for an endothermic reactionReaction profile for an exothermic reactionReaction profile for an endothermic reactionQuestion 1 of 16 Loading... 2. In a chemical reaction, the overall molar enthalpy is +87 kJ/mol. Is this reaction exothermic or endothermic?Depends on the reagentsEndothermicExothermicDepends on the temperature of the surroundingsQuestion 2 of 16 Loading... 3. What is meant by the term exothermic?A reaction in which heat energy is given out (surroundings get hotter)A reaction which will only be spontaneous at warm temperatures (above 100⁰C)A reaction which will only be spontaneous at cold temperatures (below 0⁰C)A reaction in which heat energy is taken in (surroundings get colder)Question 3 of 16 Loading... 4. In an endothermic reaction, which is greater: the energy taken in when breaking bonds or the energy released when bonds are made?Energy released when bonds are madeEnergy taken in when making bondsDepends on the temperature of the surroundingsEnergy taken in when breaking bondsQuestion 4 of 16 Loading... 5. Use Q=mcΔT and c=4.18J/°C/g. A strip of magnesium is added to a beaker with 200cm³ of copper (II) sulfate. The temperature starts at 21.7°C and rises to a maximum of 23.1°C. What is the total heat energy change?1247 J2.153 kJ1944 kJ1170 JQuestion 5 of 16 Loading... 6. Explain why experimental values of enthalpy change differ from theoretical valuesDifferent equipment produces different results. Not all the reactants are used upHeat energy is lost to the surroundings. Not all the reactants are used up.Different equipment produces different results. Heat energy is lost to the surroundings. Not all the reactants are used upDifferent equipment produces different results. Heat energy is lost to the surroundingsQuestion 6 of 16 Loading... 7. Use Q=mcΔT and c=4.18J/°C/g. A spatula of sodium fluoride is put into a boiling tube with 25cm³ of water. The temperature drops from 22.0°C to 18.6°C. What is the total heat energy change?355 J355 kJ/mol1944 J1944 kJQuestion 7 of 16 Loading... 8. Explain, in terms of making and breaking bonds, why a reaction could be endothermicThe energy needed to break the bonds is more than the energy released to make the bondsThe bonds in the reagents are weaker than the bonds in the productsThe energy needed to break the bonds is less than the energy released to make the bondsBreaking the bonds is more favourable than making themQuestion 8 of 16 Loading... 9. In a chemical reaction, 250 kJ/mol is taken to break all the bonds and 280 kJ/mol is released when new bonds are formed. What is the overall molar enthalpy of the reaction?-530 kJ/mol+530 kJ/mol-30 kJ/mol+30 kJ/molQuestion 9 of 16 Loading... 10. When a solid dissolves, is this process exothermic or endothermic?Depends on the reagentsDepends on the temperature of the surroundingsEndothermicExothermicQuestion 10 of 16 Loading... 11. In a combustion calorimetry experiment, 0.78g of ethanol (C₂H₅OH) produced 12,540 J of heat energy. Calculate the molar enthalpy change.-369 kJ/mol (Amount = 0.78/23 = 0.034 mol. Answer = 12540/1000/0.034 = 369 kJ/mol)-213 kJ/mol (Amount = 46/0.78 = 59.0 mol. Answer = 12540/59.0 = 213 kJ/mol)-738 kJ/mol (Amount = 0.78/46 = 0.017 mol. Answer = 12540/1000/0.017 = 738 kJ/mol)-425 kJ/mol (Amount = 23/0.78 = 29.5 mol. Answer = 12540/29.5 = 425 kJ/mol)Question 11 of 16 Loading... 12. What is meant by the term endothermic?A reaction in which heat energy is given out (surroundings get hotter)A reaction which will only be spontaneous at warm temperatures (above 100⁰C)A reaction which will only be spontaneous at cold temperatures (below 0⁰C)A reaction in which heat energy is taken in (surroundings get colder)Question 12 of 16 Loading... 13. In a calorimetry experiment to investigate the heat energy released by the combustion of ethanol, why should the water in the calorimeter be stirred?To prevent the water from evaporatingTo ensure the heat energy is mixed evenly throughout all the waterTo allow the heat to spread evenly through the copper containerTo ensure the container does not get too hotQuestion 13 of 16 Loading... 14. State the units of molar enthalpy change.mol/⁰CkJ/⁰CJ/⁰C/molkJ/molQuestion 14 of 16 Loading... 15. Are displacement reactions exothermic or endothermic?Depends on the temperature of the surroundingsExothermicEndothermicDepends on the reagentsQuestion 15 of 16 Loading... 16. What does the symbol ΔH meanexothermicheat energyenthalpy (energy) changespecific heat capacityQuestion 16 of 16 Loading... Related Posts:The entire quiz question bank!The entire quiz question bank (Double only)!Key Calculations quizEquilibria (triple) quizCondensation Polymers quizElectrolysis quiz Hydr0Gen2020-02-16T16:59:30+00:00Categories: Uncategorized|Tags: Quiz, Topic: Energetics| Share This Story, Choose Your Platform! FacebookTwitterRedditLinkedInTumblrPinterestVkEmail