Comparing the Enthalpy Changes of Combustion of Different Alcohols
Introduction
In this investigation I will set out to find the differences in the
enthalpies of combustion of 6 different alcohols. These are methanol,
ethanol, butan-2-ol, propan-1-ol, propan-2-ol and 2Methylpropan-1-ol.
I can then find the variation between straight chain and branched
molecules and isomers.
Planning
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Method
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Carrying Out The Experiment
To carry out the experiment, I will fill my calorimeter with 75g of
water. It is important that this is accurate, as it is needed to find
the enthalpy change. The calorimeter will be held up by a clamp,
connected by a boss to a clamp stand so that heat can be applied
without having to hold the calorimeter up myself. The calorimeter
always needs to be the same distance away from the heatproof mat at
the bottom. The calorimeter is made of copper and is a good conductor
which means that most of the heat the copper absorbs will be passed
onto the water inside it.I will then need another clamp stand, clamp
and boss to set up a draft-extrusion system. This will be 3 heatproof
mats which will surround the calorimeter, ensuring that as much of the
heat as possible goes to the calorimeter and not its surroundings. I
will then need to record the starting temperature, as this is needed
to find the change in temperature. Now, I take the mass of the spirit
burner I have so that I can calculate the amount of alcohol that was
used during the combustion. I can now light it and let it burn. I will
aim for a temperature change of 20°C. Once it reaches that temperature
change, I will need to pull away the spirit burner and then record the
final temperature of the water and also weigh the final mass of the
fuel. I can then find out the change in temperature, which is the
final temperature - the initial temperature. The mass of alcohol used
can be calculated by the initial mass of alcohol used - the final mass
Catching Fire: How Coooking Made us Human by Richard Wrangham is a fresh perspective on the evolution of humankind. Wrangham has made a concentrated effort to prove that humans have evolved particular adaptations, like bipedalism, due to the introduction of cooked foods into their diet. In his book, he is legitimately arguing that humans are the way they are because early on in human evolution, early man discovered fire, discovered the joys of cooked foods, and developed all sorts of fascinating traits still being utilized today.
Does changing the length of the carbon chain effect the heat of combustion of water when heated for 2 minutes?
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picked up some dirt from the fire place and threw it up in the air and
Investigation of the heat energy produced by combustion of various alcohols. Aim: ---- To investigate how different alcohols produce different amounts of heat energy through combustion. I will be heating water using different alcohols as fuels and measuring the amount of fuel consumed.
one gram of water by 1ºC. I chose to use water because it is safe,
= 3 ´ E(C-H) + 1 ´ E(C-O) + 1 ´ E(O-H) + 1.5 ´ E(O=O)
Determination of the Enthalpy Change of a Reaction. Determine the enthalpy change of the thermal decomposition of calcium carbonate by an indirect method based on Hess' law. Determination of the Enthalpy Change of a Reaction. Determine the enthalpy change of the thermal decomposition of calcium carbonate by an indirect method based on Hess' law. Using the proposed method of obtaining results, these values were gathered.
NaOH(aq)Â Â Â Â Â Â Â Â +Â Â Â Â Â Â Â Â Â HCl(aq)Â Â Â Â Â Â Â Â Â Â Â Â Â Ã Â Â Â Â Â Â Â Â Â Â Â Â NaCl(aq) Â Â Â Â Â Â + Â Â Â H2O(l).
be yes as I will then be able to use enthalpy change of reaction to
Investigating Factors Affecting the Heat of Combustion of Alcohols PLANNING SECTION Introduction ------------ Alcohols are organic substances, and consist of Hydrogen, Oxygen and Carbon. All alcohols are toxic but the amount that can be tolerated by the human body varies for different alcohols. For example drinking small amounts of Methanol can lead to blindness and even death.
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The crucible and lid are heated at the beginning of the experiment before being weighed so that any moisture in the crucible is burned away.
Colorimetry is the process of determining the concentration of a substance of a substance by measuring the relative of light. The instrument used is called a calorimeter. Colorimetry is the scientific method that is used to classify the colours of the spectrum.
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