Chemistry-C5-Exo and Endo Reactions +(Temp. Change Practical)

Exothermic Reactions _________ energy to the ________?

release energy to the surroundings

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This means that the temperature of the surroundings?

rise

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Some examples of exothermic reactions?
(5)

combustion
oxidation
hand warmers
neutralisation
self heat cans

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Endothermic reaction ________ ____ energy from the _____?

take in energy from the surroundings

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This means the temperature of the surroundings?

decrease

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An example of an endothermic reaction?

thermal decomposition

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What is activation energy?

the minimum amount of energy needed in order for particles to collide and start a reaction

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TEMPERATURE CHANGE PRACTICAL
-------------------------------------
Here we are doing a ________ reaction between which two reactants?

neutralisation
HCl and NaOH

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What is the :
IV?
DV?
CV?

IV-Volume of sodium hydroxide solution
DV-max temperature reached
CV- volume of HCl, conc of HCl and NaOH solution

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Firstly, measure out ____ cm cubed of HCl?

30

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Then transfer this to a ?

polystyrene cup

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Then place the polystyrene cup into a?

beaker

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This stops the cup from?

falling over

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And prevents?

energy loss

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We could further prevent energy loss by adding what?

cotton wool

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Then using a _______ measure the ______ of the acid?

using a thermometer measure the temperature of the acid

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Then do what with the value?

record it on a table

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Then use a ______ _____ to measure out _ cm cubed of sodium hydroxide solution?

use a measuring cylinder to measure 3cm cubed of sodium hydroxide solution

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Then transfer this to the what?

polystyrene cup

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Then place a what on the cup?

plastic lid

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And put the thermometer where?

in the hole of the lid

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Then _____ the solution using the?

stir using thermometer

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Since this reaction is an _______ reaction?

exothermic

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This means that energy is?

released

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Therefore the temp will?

rise

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Record the _____ temperature reached?

highest

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And _____out and ___ the polystyrene cup?

rinse out and dry

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Then repeat adding _cm cubed of sodium hydroxide solution each time until you reach ___ cm cubed?

5cm cubed
40cm cubed

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Repeat the whole investigation and calculate a ?

mean value

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And plot?

a graph

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As we increase the volume of NaOH solution, the max temperature reached will?

also increase

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This is because there are ____ particles of NaOH for HCl to react with, so ____ energy is released and max temperature _______.

This is because there are more particles of NaOH for HCl to react with, so more energy is released and max temperature increases.

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Chemistry-C5-Exo and Endo Reactions +(Temp. Change Practical)

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