Difference between revisions of "Rate of Reaction"

Revision as of 12:08, 16 January 2019

Key Stage 4

Meaning

Rate of reaction is a measure of how quickly the reactants react to create the products.

About the Rate of Reaction

The longer the time taken for a reaction the lower the rate of reaction. The shorter the time taken for a reaction the higher the rate of reaction.

High rates of reaction are important to in industries where a lot of products are needed in a short amount of time. This can save money.

Low rates of reaction are important in materials that corrode with chemicals in the environment. This allows them to last a long time before destroyed by Oxidation or chemical weathering.

Examples


Rusting has a low rate of reaction.	Burning Magnesium ribbon has a high rate of reaction.

Determining the Rate of Reaction

There are two approaches to finding the rate of reaction for some chemicals.

Find out how quickly the reactants are used up.
Find out how quickly new products are made.

Continuously Measuring Volume of Gas

For reactions which give off a gas the volume of gas produced can be measured throughout an experiment to find the rate of reaction.


This diagram shows a possible setup for measuring the gas given off during an experiment.

Continuously Measuring the Mass

For reactions which give off a gas the mass of reaction mixture can be measured throughout an experiment to find the rate of reaction.


This diagram shows a possible setup for measuring the mass of the reaction mixture during an experiment.

Continuously Measuring the Opacity

For reactions in which the reactants are in a transparent solution but the products form an insoluble precipitate that is opaque then the opacity can be measured.


This diagram shows a possible setup for identifying when a mixture becomes opaque during a reaction.

@@ Line 25: / Line 25: @@
 ====Continuously Measuring Volume of Gas====
+For [[reaction]]s which give off a [[gas]] the [[Volume (Space)|volume]] of [[gas]] [[product|produced]] can be [[measure]]d throughout an [[experiment]] to find the '''rate of reaction'''.
+{| class="wikitable"
+|-
+|[[File:MeasuringGasGivenOff.png|center|400px]]
+|-
+| style="height:20px; width:200px; text-align:center;" |This [[diagram]] shows a possible setup for [[measuring]] the [[gas]] given off during an [[experiment]].
+|}
 ====Continuously Measuring the Mass====
-For [[reaction]]s which give off a gas
+For [[reaction]]s which give off a [[gas]] the [[mass]] of [[Reaction Mixture|reaction mixture]] can be [[measure]]d throughout an [[experiment]] to find the '''rate of reaction'''.
+{| class="wikitable"
+|-
+|[[File:MeasuringMass.png|center|200px]]
+|-
+| style="height:20px; width:200px; text-align:center;" |This [[diagram]] shows a possible setup for [[measuring]] the [[mass]] of the [[Reaction Mixture|reaction mixture]] during an [[experiment]].
+|}
+====Continuously Measuring the Opacity====
+For [[reaction]]s in which the [[reactant]]s are in a [[transparent]] [[solution]] but the [[product]]s form an [[insoluble]] [[precipitate]] that is [[opaque]] then the [[opacity]] can be [[measure]]d.
+{| class="wikitable"
+|-
+|[[File:MeasuringOpacity.png|center|400px]]
+|-
+| style="height:20px; width:200px; text-align:center;" |This [[diagram]] shows a possible setup for identifying when a [[mixture]] becomes [[opaque]] during a [[Chemical Reaction|reaction]].
+|}