Equilibria (triple) quiz Loading... 1. What is a catalyst?A substance that speeds up a chemical reaction but is chemically unchanged at the end of the reactionA substance that helps dissolve insoluble reagents to speed up the rate of reactionA substance that speeds up a chemical reaction but is used up as the reaction proceedsA substance that slows down a chemical reaction but is chemically unchanged at the end of the reactionQuestion 1 of 15 Loading... 2. What does this symbol represent?Dynamic equilibriumYield of reaction is the same both waysRate of forward reaction equals rate of backwards reactionReversible reactionQuestion 2 of 15 Loading... 3. One feature of dynamic equilibrium is that the rate of the forward reaction is equal to the rate of the backward reaction. What is the other feature?The yield of the forwards reaction is greater than 50%There is no overall change in concentrationsThe yield of the backward reaction is greater than 50%The concentration of the products is increasingQuestion 3 of 15 Loading... 4. What will happen to the equilibrium position when we add a catalyst? Give a reason for your prediction. 2A (s) + B (g) ⇋ C (g) + D (g) (-∆H)Equilibrium will not shift in position, because catalyst does not affect the position of equilibriumEquilibrium will move to the left, because a catalyst increases the forward rate of reactionEquilibrium will move to the right, because a catalyst increases the backward rate of reactionEquilibrium will move to the right, because a catalyst increases the forward rate of reactionQuestion 4 of 15 Loading... 5. Explain why experimental values of enthalpy change differ from theoretical valuesHeat energy is lost to the surroundings. Not all the reactants are used up.Different 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 upDifferent equipment produces different results. Heat energy is lost to the surroundingsQuestion 5 of 15 Loading... 6. In a sealed container, a reversible reaction can reach a state of ______________________________Variable equilibriumStatic equilibriumConstant equilibriumDynamic equilibriumQuestion 6 of 15 Loading... 7. With how much energy must two particles collide for a reaction to occur?The 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 the activation energyThe particles must collide with an energy greater than or equal to the activation energyQuestion 7 of 15 Loading... 8. What does this diagram represent?Reaction profile for an endothermic reactionReaction profile for an exothermic reactionEnergy level diagram for an endothermic reactionEnergy level diagram for an exothermic reactionQuestion 8 of 15 Loading... 9. What colour is anhydrous copper (II) sulfate?BluePurpleWhiteCreamQuestion 9 of 15 Loading... 10. 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 cold temperatures (below 0⁰C)A reaction which will only be spontaneous at warm temperatures (above 100⁰C)A reaction in which heat energy is taken in (surroundings get colder)Question 10 of 15 Loading... 11. The addition of water to anhydrous copper sulfate can be used to test for the presence of water. The reaction is reversible. What is the word equation? Describe the colour change.anhydrous copper sulfate (blue) + water ⇌ hydrated copper sulfate (white)anhydrous copper sulfate (white) + water ⇌ hydrated copper sulfate (blue)anhydrous copper sulfate (white) + water ⇌ hydrous copper sulfate (blue)anhydrous copper sulfate (blue) + water ⇌ hydrous copper sulfate (white)Question 11 of 15 Loading... 12. State the expression for calculating % yield.% yield = (actual amount of products/theoretical amount of products)% yield = (theroretical amount of products/actual amount of products)% yield = (actual amount of products/theoretical amount of products) x 100% yield = (theroretical amount of products/actual amount of products) x 100Question 12 of 15 Loading... 13. State and explain how increasing temperature affects the diffusion of a gasGas diffuses quicker because there is less in its wayGas diffuses slower because the particles collide more often with the airGas diffuses slower because the particles have less energyGas diffuses quicker because particles have more energy.Question 13 of 15 Loading... 14. 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) more frequent collisions 3) decrease rate of reaction1) more particles exposed 2) less frequent collisions 3) decrease rate of reaction1) more particles exposed 2) less frequent collisions 3) increase rate of reaction1) more particles exposed 2) more frequent collisions 3) increase rate of reactionQuestion 14 of 15 Loading... 15. Why a catalyst does not affect the position of equilibrium in a reversible reaction?A catalyst has no effect on a forward or backward reactions if it is in dynamic equilibriumA catalyst reduces the activation energy, and is not used upA reaction in dynamic equilibrium already has the lowest possible activation energyIf 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 unaffectedQuestion 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! FacebookXRedditLinkedInTumblrPinterestVkEmail