The Transfer of Energy During Heating of Large Molecules

The Transfer of Energy During Heating of Large Molecules

AIM:

The aim of this investigation is, to find out which molecules transfer

the most energy.

PREDICTION:

I predict that as the numbers of particles are increased, the energy

transferred will also be increased. We will use methanol, ethanol,

propanol, butonol and octanol.

The word and symbol equations for these reactions are:

Methanol:

Methanol + oxygen carbon dioxide + water

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C2H5OH + 3O2 2CO2 +4H20

Ethanol:

Ethanol + oxygen carbon dioxide + water

C2H5OH + 3O2 2CO2 + 3H20

Propanol:

Propanol + oxygen carbon dioxide + water

2C3H7OH + 9O2 6CO2 + 8H2O

Butanol:

Butanol + oxygen carbon dioxide + water

C4H9OH + 6O2 4CO2 + 5H2O

Octanol:

Octanol + oxygen carbon dioxide + water

C8H17OH + 12O2 8CO2 + 9H2O

All of these reactions are exothermic reaction. At the start of each

reaction, less energy is taken in to break the bonds than is given out

at the end of the reaction when new bonds are being made

(more heat is given out). More energy will be needed to break the

bonds apart as we go down the list as there will be more bonds to

break.

APPARATUS:

1) Thermometer

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2) Stopwatch

3) Metal beaker

4) Copper tin

5) 100g water

[IMAGE]

PLAN:

1) Set up apparatus as shown in the diagram

2) In results table, write the start temperature of the water and the

start mass of the

substance.

3) Light the substance at the wick.

4) When the temperature of the water in the metal beaker increases by

20°blow out the wick to stop the experiment.

5) Write the end temperature down in your result table.

6) Measure the substance and write down the mass at the end of the

reaction in the result table.