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level: Rates of Reaction - Required Practical: Temperature & Catalysts

Questions and Answers List

Question	Answer
sodium thiosulfate solution + hydrochloric acid -> ?	solid sulfur
Solid sulfur makes the solution go cloudy. Scientists call this ?	turbidity
A measurement is ? if it can be repeated by another person or using a different technique or equipment and still get the same result.	reproducable
The problem with the disappearing cross experiment is that different people have different ?	eyesights
magnesium + hydrochloric acid -> magnesium chloride + ?	hydrogen
The greater the concentration of a chemical in a reaction, the ? the reaction takes place.	faster
? states that chemical reactions can only take place when the reacting particles collide with each other with sufficient energy.	collision theory
The rate of a chemical reaction is determined by the ? of successful collisions.	frequency
Because the rate of reaction increases with temperature, we can say that the rate of reaction is ? to the temperature.	proportional
Catalysts increase the rate of chemical reactions but are not ? during the reaction.	used up
We do not include catalysts in the ? for a reaction because they are not used up in the reaction.	chemical equation
Different ? need different catalysts.	reactions
? act as catalysts in living organisms.	enzymes