Equilibria (triple) quiz Loading... 1. One feature of dynamic equilibrium is that there is no overall change in concentrations. What is the other?The yield of the backward reaction is greater than 50%The yield of the forwards reaction is greater than 50%The rate of the forward reaction is equal to the rate of the backward reactionThe rate of the forward reaction is greater than the rate of the backward reactionQuestion 1 of 15 Loading... 2. For a reversible reaction to reach dynamic equilibria, where must the reaction take place?At constant pressureIn a warm environment (above 0⁰C)In a cool environment (below 0⁰C)In a sealed containerQuestion 2 of 15 Loading... 3. Explain the effects of increasing the surface area of a solid on the rate of a reaction in terms of particle collision theory1) more particles exposed 2) less frequent collisions 3) increase rate of reaction1) more particles exposed 2) more frequent collisions 3) increase rate of reaction1) more particles exposed 2) less frequent collisions 3) decrease rate of reaction1) more particles exposed 2) more frequent collisions 3) decrease rate of reactionQuestion 3 of 15 Loading... 4. What will happen to the yield of C when the pressure is increased? Give a reason for your prediction. A (g) + B (g) ⇋ C (g) (+∆H)Decreases because there are fewer molecules on the left hand sideDecreases because there are fewer molecules on the right hand sideIncreases because there are fewer molecules on the right hand sideIncreases because there are fewer molecules on the left hand sideQuestion 4 of 15 Loading... 5. With how much energy must two particles collide for a reaction to occur?The particles must collide with an energy greater than the activation energyThe particles must collide with an energy less than the activation energyThe particles must collide with an energy equal to the activation energyThe particles must collide with an energy greater than or equal to the activation energyQuestion 5 of 15 Loading... 6. 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 ensure the container does not get too hotTo allow the heat to spread evenly through the copper containerQuestion 6 of 15 Loading... 7. What colour is anhydrous copper (II) sulfate?PurpleBlueWhiteCreamQuestion 7 of 15 Loading... 8. What does the symbol ⇌ mean?Equal amounts of reactants and productsReversible reactionA reaction that requires a catalystVariable oxidation stateQuestion 8 of 15 Loading... 9. What is a catalyst?A substance that speeds up a chemical reaction but is chemically unchanged at the end of the reactionA substance that speeds up a chemical reaction but is used up as the reaction proceedsA substance that helps dissolve insoluble reagents to speed up the rate of reactionA substance that slows down a chemical reaction but is chemically unchanged at the end of the reactionQuestion 9 of 15 Loading... 10. 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 10 of 15 Loading... 11. What does the symbol ΔH meanenthalpy (energy) changeheat energyspecific heat capacityexothermicQuestion 11 of 15 Loading... 12. In the thermal decomposition of calcium carbonate, we might expect 50g of calcium carbonate to produce 28g of calcium oxide. If instead only 24g of calcium oxide is produced, what is the percentage yield?85.7 %0.56 %56 %0.857 % Question 12 of 15 Loading... 13. Why a catalyst does not affect the position of equilibrium in a reversible reaction?A catalyst reduces the activation energy, and is not used upIf a reversible reaction is in dynamic equilibrium, a catalyst increases the rate of the forward reaction and the rate of the backward reaction by the same amount, so the position of equilibrium is unaffectedA reaction in dynamic equilibrium already has the lowest possible activation energyA catalyst has no effect on a forward or backward reactions if it is in dynamic equilibriumQuestion 13 of 15 Loading... 14. Gas particles move at a speed of several hundred metres per second at room temperature. Explain why gases take several minutes to diffuse across a roomGas particles travel very slowlyGas particles collide with air particles and move in random directionsGas particles collide with air particles and move in only one directionGas particles are lazy and do not want to reach the other side of the roomQuestion 14 of 15 Loading... 15. Ammonia and hydrogen chloride react together in a reversible reaction to produce a white solid. What are the word and symbol equations?ammonia + hydrogen chloride ⇌ ammonium chloride + hydrogen 2NH₃ + 2HCl ⇌ 2NH₃Cl + H₂ammonia + hydrogen chloride ⇌ ammonium chloride + water NH₃ + HCl ⇌ NH₄Cl + H₂O ammonia + hydrogen chloride ⇌ ammonium chloride NH₃ + HCl ⇌ NH₄Clammonia + hydrogen chloride ⇌ ammonium hydrochloride NH₃ + HCl ⇌ NH₃ClHQuestion 15 of 15 Loading... Related Posts:The entire quiz question bank!The entire quiz question bank (Double only)!Key Calculations quizCondensation Polymers quizElectrolysis quizAlcohols & Carboxylic Acids quiz Hydr0Gen2020-02-16T17:37:02+00:00Categories: Uncategorized|Tags: Quiz, Topic: Equilibria| Share This Story, Choose Your Platform! FacebookTwitterRedditLinkedInTumblrPinterestVkEmail