Rates of Reactions - Part 1 | Reactions | Chemistry | FuseSchool

Rates of Reactions - Part 1 | Reactions | Chemistry | FuseSchool
In this video you are going to learn what the reaction rate is and some ways of measuring reaction rate.
Reaction rate is a measure of how quickly the reactants in a reaction change into the products of the reaction.
The rate of a chemical reaction can be measured in two ways:
1) The first way is to measure how quickly the reactants (the substances on the left of the arrow in the equation) decrease.
2) The second way is to measure how quickly the products (the substances on the right of the arrow in the equation) increase.
Example for 1: Measuring how quickly reactants decrease.
We will look at the reaction between marble chips (calcium carbonate) and hydrochloric acid.
As the reaction proceeds, the reactants lose mass because carbon dioxide gas is given off. We can measure the decrease in mass of reactants by using this type of apparatus with a conical flask stopwatch, cotton wool plug and balance.
Based on our measurements, we plot a graph of ‘mass of reactants against time’.
The rate of reaction at point A is given by the gradient at A which is y/x and the rate of reaction at point B is given by the gradient at point B which is y’/x’ .
Example for 2:
Instead of measuring the loss of mass of the reactant we can also measure the gain in volume of the product carbon dioxide.
Watch part 2 to learn more: • Rates of Reaction - Pa...
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Rate of reaction can also be measure by pH change or color change as in standard titration experiments 💣

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Attention Fuse School - the first graph is wrong. After CO2 escapes, the mass of the contents of the flask does not drop to zero. However, the graph says so.

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at 3.47 wouldn't the answer be that the reaction is increasing

[@fuseschool]

Hi there! The reaction at 3:47 slows down, and so the rate of the reaction decreases.

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But product's concentration also decreases when reaction starts to go in reverse direction.please reply

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I was playing the video at times 3 speed and didn't notice anything wrong

[@saffansamnani6943]

It is written in my chemistry book that changing volume does not affect the rate of reaction but in my view changing volume changes concentration which in turn changes or we can say decreases the rate of reaction. Can you please describe what does my book means to say?😟😟😓

[@fuseschool]

Obviously, if you are dealing with a gas, changing the volume of a fixed mass of gas will change the "concentration" ie. the pressure, so that will normally affect the rate of the reaction. Just adding more gas but keeping the pressure the same won't help. If you have a solid reacting, then an increased volume will increase the surface area, so will normally increase the reaction rate. In the case of a liquid changing the volume will make no difference as long as you measure the rate 'per mole', however the more reactant you have (increased volume), assuming it can be in contact with more of the other reactants obviously, the faster you will produce the products.

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3 comments :/