Energetics (Triple) quiz Loading... 1. What does this diagram represent?Energy level diagram for an endothermic reactionReaction profile for an exothermic reactionReaction profile for an endothermic reactionEnergy level diagram for an exothermic reactionQuestion 1 of 16 Loading... 2. 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 kJ/mol1944 J1944 kJ355 JQuestion 2 of 16 Loading... 3. What is meant by the term exothermic?A reaction which will only be spontaneous at cold temperatures (below 0⁰C)A reaction in which heat energy is taken in (surroundings get colder)A reaction in which heat energy is given out (surroundings get hotter)A reaction which will only be spontaneous at warm temperatures (above 100⁰C)Question 3 of 16 Loading... 4. 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 allow the heat to spread evenly through the copper containerTo ensure the container does not get too hotTo ensure the heat energy is mixed evenly throughout all the waterQuestion 4 of 16 Loading... 5. When a solid dissolves, is this process exothermic or endothermic?EndothermicDepends on the reagentsDepends on the temperature of the surroundingsExothermicQuestion 5 of 16 Loading... 6. What does this diagram represent?Reaction profile for an exothermic reactionEnergy level diagram for an endothermic reactionEnergy level diagram for an exothermic reactionReaction profile for an endothermic reactionQuestion 6 of 16 Loading... 7. In a chemical reaction, the overall molar enthalpy is +87 kJ/mol. Is this reaction exothermic or endothermic?Depends on the reagentsEndothermicDepends on the temperature of the surroundingsExothermicQuestion 7 of 16 Loading... 8. In a chemical reaction, the overall molar enthalpy is -87 kJ/mol. Is this reaction exothermic or endothermic?Depends on the temperature of the surroundingsEndothermicDepends on the reagentsExothermicQuestion 8 of 16 Loading... 9. 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 J1170 J1944 kJ2.153 kJQuestion 9 of 16 Loading... 10. In an endothermic reaction, which is greater: the energy taken in when breaking bonds or the energy released when bonds are made?Depends on the temperature of the surroundingsEnergy taken in when making bondsEnergy released when bonds are madeEnergy taken in when breaking bondsQuestion 10 of 16 Loading... 11. State the units of molar enthalpy change.kJ/⁰CJ/⁰C/molmol/⁰CkJ/molQuestion 11 of 16 Loading... 12. Are combustion reactions exothermic or endothermic?Depends on the temperature of the surroundingsDepends on the reagentsEndothermicExothermicQuestion 12 of 16 Loading... 13. 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 13 of 16 Loading... 14. 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 surroundingsDifferent equipment produces different results. Heat energy is lost to the surroundings. Not all the reactants are used upQuestion 14 of 16 Loading... 15. 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)-425 kJ/mol (Amount = 23/0.78 = 29.5 mol. Answer = 12540/29.5 = 425 kJ/mol)-738 kJ/mol (Amount = 0.78/46 = 0.017 mol. Answer = 12540/1000/0.017 = 738 kJ/mol)Question 15 of 16 Loading... 16. Is breaking bonds exothermic or endothermic?Depends on the temperature of the surroundingsExothermicDepends on the reagentsEndothermicQuestion 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! FacebookXRedditLinkedInTumblrPinterestVkEmail