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Rates of reaction

rates-of-reaction-1

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Change in mass

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As the gas is released the mass disappearing is easily measured on the balance
It is the most accurate method
The disadvantage is that it does release a gas straight into the room
The quicker the reading, the faster the reaction
Measuring the speed of a reaction that produces a gas can be carried out on a mass balance

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Volume of gas given off

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Involves the use of a gas syrings to measure the volume of gas given off
The more gas given off during a given time interval, the faster the reaction

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Rate of reaction experiment: Reaction of hydrochloric acid and marbles

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Explanation

You need to measure the amount of gas given off at different time intervals

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This is used to demonstrate the effect of breaking up a solid into small bits
Using finer particles means the marbles will have a larger surface area
A larger surface area mean more frequent collisions, which is a faster reaction

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What four things does a rate of reaction depend on?

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One of the slowest reactions
A moderate speed reaction
A really fast reaction

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An explosion
The rusting of iron
A metal reacting with acid to produce a gentle stream of bubbles

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What are the ways rate of reaction can be measured?

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Precipitation

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This only works for reactions where the initial solution is relatively see-through
The result can be very subjective
When the product of a reaction is a precipitate and clouds the solution
Observe a mark in the solute and measure how long it takes to disappear

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