Which of the following statements about the effect the size of the pieces of a solid on the rate of a chemical reaction is true?
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The smaller the pieces, the bigger the surface area so there is more surface area to be attacked
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The bigger the pieces, the smaller the surface area, so there is more surface area to be attacked
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The bigger the pieces the bigger the surface area so there is more surface area to be attacked
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The smaller the pieces, the smaller the surface area so there is more surface area to be attacked
Q.2.
Which of the following is NOT a disadvantage of using a catalyst in a chemical reaction?
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They can be reused multiple times
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If a reaction is going too fast, simple mistakes can be made
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They can be poisoned by impurities and stop working
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They can be expensive
Q.3.
What apparatus is used to measure the volume of gas given off in a reaction?
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Stop clock
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Ruler
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Gas syringe
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Test tube
Q.4.
What units do we use to measure concentration?
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kmol/dm3
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mol/dm3
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mol/dm2
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mol/dm
Q.5.
Platinum is used as a catalyst in the production of nitric acid. Which of the following statements is correct?
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The catalyzed reaction requires more energy than the uncatalysed reaction
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The catalyzed reaction will produce more nitric acid than the reaction without platinum
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The mass of platinum will remain the same throughout the reaction
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The particles in the catalyzed reaction will have more energy than the particles in a reaction without the platinum
Q.6.
Calcium carbonate (marble) reacts with hydrochloric acid to produce water, carbon dioxide and calcium chloride. Which of the following combinations is likely to result in the fastest rate of reaction?
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1g of marble chips with 50ml of hydrochloric acid at 20 °C
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1g of marble powder with 50ml of hydrochloric acid at 20 °C
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1g of marble chips with 50ml of hydrochloric acid at 30 °C
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1g of marble powder with 50ml of hydrochloric acid at 30 °C
Q.7.
Which of the following does NOT affect the rate of a chemical reaction between a solid and a liquid?
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Concentration
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Temperature
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Altitude
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Surface area
Q.8.
Which of the following statements about collisions is correct?
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Only fast-moving particles collide with each other
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All colliding particles have the same amount of energy
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Reactions can only happen if the colliding particles have enough energy
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All colliding particles are at the same temperature
Q.9.
What is activation energy?
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The maximum energy that particles need to change into a new substance
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The minimum energy required to break the bonds of the colliding chemicals
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The minimum energy that particles need to change into a new particle
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The maximum energy that particles need to change into a new substance when they collide with other particles
Q.10.
On an energy level diagram, what effect would adding a catalyst have to the reaction on the line showing the energy for a reaction?
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It would go higher
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It would not go as high
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It would be the same
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It would be a straight line not a curve
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