Energetics (Triple) quiz Loading... 1. What does this diagram represent?Reaction profile for an endothermic reactionEnergy level diagram for an exothermic reactionReaction profile for an exothermic reactionEnergy level diagram for an endothermic reactionQuestion 1 of 16 Loading... 2. When a solid dissolves, is this process exothermic or endothermic?ExothermicDepends on the reagentsEndothermicDepends on the temperature of the surroundingsQuestion 2 of 16 Loading... 3. 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?1170 J2.153 kJ1247 J1944 kJQuestion 3 of 16 Loading... 4. What does the symbol ΔH meanexothermicspecific heat capacityenthalpy (energy) changeheat energyQuestion 4 of 16 Loading... 5. 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. 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.Different equipment produces different results. Not all the reactants are used upQuestion 5 of 16 Loading... 6. In an exothermic 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 breaking bondsEnergy released when bonds are madeEnergy taken in when making bondsQuestion 6 of 16 Loading... 7. Is breaking bonds exothermic or endothermic?ExothermicEndothermicDepends on the reagentsDepends on the temperature of the surroundingsQuestion 7 of 16 Loading... 8. What is meant by the term exothermic?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)A reaction in which heat energy is given out (surroundings get hotter)Question 8 of 16 Loading... 9. Are neutralisation reactions exothermic or endothermic?ExothermicEndothermicDepends on the temperature of the surroundingsDepends on the reagentsQuestion 9 of 16 Loading... 10. 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?3383 J2153 J1254 J2.153 kJQuestion 10 of 16 Loading... 11. 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 allow the heat to spread evenly through the copper containerTo ensure the heat energy is mixed evenly throughout all the waterTo ensure the container does not get too hotTo prevent the water from evaporatingQuestion 11 of 16 Loading... 12. In a chemical reaction, the overall molar enthalpy is +87 kJ/mol. Is this reaction exothermic or endothermic?Depends on the reagentsExothermicDepends on the temperature of the surroundingsEndothermicQuestion 12 of 16 Loading... 13. What is meant by the term endothermic?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 which will only be spontaneous at warm temperatures (above 100⁰C)A reaction in which heat energy is given out (surroundings get hotter)Question 13 of 16 Loading... 14. 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 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+530 kJ/mol-30 kJ/mol-530 kJ/molQuestion 15 of 16 Loading... 16. State the units of molar enthalpy change.kJ/molkJ/⁰CJ/⁰C/molmol/⁰CQuestion 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