Energetics (Triple) quiz Loading... 1. State the units of molar enthalpy change.kJ/molkJ/⁰Cmol/⁰CJ/⁰C/molQuestion 1 of 16 Loading... 2. What is meant by the term exothermic?A reaction in which heat energy is taken in (surroundings get colder)A reaction which will only be spontaneous at cold temperatures (below 0⁰C)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 2 of 16 Loading... 3. Use Q=mcΔT and c=4.18J/°C/g. 25cm³ of sulfuric acid is put into a boiling tube. The starting temperature is 21°C. A spatula of iron filings is added. After a while the temperature reaches 33°C. What is the total heat energy change?2153 J3383 J1254 J2.153 kJQuestion 3 of 16 Loading... 4. Are displacement reactions exothermic or endothermic?Depends on the reagentsDepends on the temperature of the surroundingsExothermicEndothermicQuestion 4 of 16 Loading... 5. What is meant by the term endothermic?A reaction in which heat energy is taken in (surroundings get colder)A reaction which will only be spontaneous at cold temperatures (below 0⁰C)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 5 of 16 Loading... 6. When a solid dissolves, is this process exothermic or endothermic?Depends on the temperature of the surroundingsDepends on the reagentsEndothermicExothermicQuestion 6 of 16 Loading... 7. 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 7 of 16 Loading... 8. 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 ensure the heat energy is mixed evenly throughout all the waterTo prevent the water from evaporatingTo allow the heat to spread evenly through the copper containerTo ensure the container does not get too hotQuestion 8 of 16 Loading... 9. Is breaking bonds exothermic or endothermic?Depends on the reagentsEndothermicDepends on the temperature of the surroundingsExothermicQuestion 9 of 16 Loading... 10. 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 J1944 kJ2.153 kJ1170 JQuestion 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)-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)-213 kJ/mol (Amount = 46/0.78 = 59.0 mol. Answer = 12540/59.0 = 213 kJ/mol)Question 11 of 16 Loading... 12. Explain why experimental values of enthalpy change differ from theoretical valuesDifferent equipment produces different results. Heat energy is lost to the surroundingsDifferent equipment produces different results. Not all the reactants are used upDifferent equipment produces different results. Heat energy is lost to the surroundings. Not all the reactants are used upHeat energy is lost to the surroundings. Not all the reactants are used up.Question 12 of 16 Loading... 13. What does this diagram represent?Reaction profile for an exothermic reactionReaction profile for an endothermic reactionEnergy level diagram for an endothermic reactionEnergy level diagram for an exothermic reactionQuestion 13 of 16 Loading... 14. What does the symbol ΔH meanexothermicenthalpy (energy) changespecific heat capacityheat energyQuestion 14 of 16 Loading... 15. 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?-30 kJ/mol+30 kJ/mol+530 kJ/mol-530 kJ/molQuestion 15 of 16 Loading... 16. In a chemical reaction, the overall molar enthalpy is -87 kJ/mol. Is this reaction exothermic or endothermic?ExothermicEndothermicDepends on the reagentsDepends on the temperature of the surroundingsQuestion 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