A catalyst is added to a reaction. Which of the following statements best describes the effect that a catalyst has on a reaction? Group of answer choicesThe catalyst gives the reactants more kinetic energyThe reaction rate is decreasedThe activation energy of the reaction is increasedThe activation energy of the reaction is decreased

What effect does a catalyst have on a reaction?A.A catalyst increases the concentrations of products.B.A catalyst contributes energy to a reaction.C.A catalyst speeds up the rate of a reaction.D.A catalyst makes it possible for a reaction to happen.

Question 11adding a catalyst increases the rate of reaction byA same reaction pathway and higher activation energyB providing an alternate pathway with lower activation energyC same reaction pathway and lower activation energyD providing an alternate pathway with higher activation energy

A catalyst speeds up a chemical reaction as a result of which of the following?Group of answer choices It provides an alternate pathway with a lower activation energy It increases the number of collisions between reacting molecules. It makes the reaction more endothermic.  It makes the reaction more exothermic

Which of the following would speed up the rate of reaction?Decreasing the temperatureUsing powder rather than lumps of reactantDecreasing the concentration of reactantRemoving a catalyst2Which of the following statements about catalysts is not true?They speed up chemical reactionsThey are chemically unchanged by a reactionThey lower the activation energy required for a reactionThey are chemically changed by a reaction3Why are catalysts useful for producing chemicals in industry?They are cheapThey increase the amount of productThey reduce the amount of reactant neededThey lower the amount of activation energy required4In the core practical ‘Investigating the effect of concentration on the rate of reaction between sodium thiosulfate and hydrochloric acid’, what is the dependent variable? Time taken for reaction to completeConcentration of hydrochloric acidTemperatureConcentration of sodium thiosulfate5In this practical, the first trial uses 5 cm3 of sodium thiosulfate solution dissolved in 25 cm3 of water. If the second trial uses 10 cm3 of sodium thiosulfate solution, how much water should be added to make the investigation a fair test? 10 cm350 cm320 cm325 cm36When investigating the rate of reaction, if one variable increases as the other decreases, what is the relationship between the two variables? UncorrelatedPositively correlatedDirectly proportionalInversely proportional

Which of the following would cause a decrease in the rate of a chemical reaction? Which of the following would cause a decrease in the rate of a chemical reaction? An increase in the concentration of the reactants. An increase in temperature. An increase in the particle size. The addition of a catalyst