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Reaction Rate

Class 9 Science के इस tag से जुड़े questions। हर question के साथ chapter, topic, level और difficulty दी गई है।

ScienceTo test the effect of acid concentration on reaction time which variable is most essential to keep the same?Class 9Exploration: Entering the World of Secondary ScienceVariables in an experimentHard ScienceLarge and small limestone pieces are used to test the effect of particle size on reaction rate. What should be equal for a fair comparison?Class 9Exploration: Entering the World of Secondary ScienceVariables in an experimentHard ScienceReaction rate was measured at four temperatures but a catalyst was also added in the highest-temperature trial. Why is the conclusion doubtful?Class 9Exploration: Entering the World of Secondary ScienceVariables in an experimentHard ScienceIf the effect of acid concentration on the reaction rate with a metal is being tested which pair is correct?Class 9Exploration: Entering the World of Secondary ScienceVariables in an experimentHard ScienceWhat problem occurs if reactant amounts are not kept the same in a reaction-rate experiment?Class 9Exploration: Entering the World of Secondary ScienceVariables in an experimentMedium ScienceIf acid concentration is changed and the reaction rate with a metal is measured, what is the independent variable?Class 9Exploration: Entering the World of Secondary ScienceVariables in an experimentMedium ScienceA student hypothesizes that smaller particles of the same mass will react faster than larger particles. Which experimental setup would test this hypothesis most fairly?Class 9Exploration: Entering the World of Secondary ScienceHypothesis and experimentationExpert ScienceThe hypothesis is that a higher acid concentration makes a reaction faster. Which measurement is most suitable as the dependent variable?Class 9Exploration: Entering the World of Secondary ScienceHypothesis and experimentationExpert ScienceA student measures reaction rate by recording total time until gas formation stops. If the final gas volume differs each time why may the comparison be unfair?Class 9Exploration: Entering the World of Secondary ScienceHypothesis and experimentationHard ScienceA student measured reaction rate at five temperatures but always tested from low to high temperature. What is a possible problem?Class 9Exploration: Entering the World of Secondary ScienceHypothesis and experimentationHard ScienceWhich conclusion is most appropriate within the limits of the data?Class 9Exploration: Entering the World of Secondary ScienceHypothesis and experimentationHard ScienceA student investigates whether acid concentration affects reaction rate. What is the most suitable measure of the rate?Class 9Exploration: Entering the World of Secondary ScienceHypothesis and experimentationHard ScienceIn an experiment reaction time decreased as temperature increased. Which type of data would be most useful to support the hypothesis?Class 9Exploration: Entering the World of Secondary ScienceHypothesis and experimentationHard ScienceIn an experiment the number of bubbles was used as an indicator of reaction rate. How can the observation be made more objective?Class 9Exploration: Entering the World of Secondary ScienceScientific questions and observationsExpert