Essay On Chemical Reactions

1008 Words 5 Pages
Introduction:
Chemical reactions are a process that involves, rearranging the molecular structure of substances to create new ones. There are 3 types of chemical reactions, firstly there's synthesis, (e.g. 2Na + Cl2 → 2NaCl); then, the other type of reaction is decomposition (CaCO3 → CaO + CO2); and finally there is combustion. Combustion is a rapid chemical combination of a substance (fuel) with oxygen, including the production of heat and light (e.g. CH4 + 2O2 → CO2 + 2H2O). In these types of reactions, bonds are broken and then formed to create the end product, which all requires the use or release of energy. To observe the way the reaction and energy works, energy diagrams are used as visual support. Energy diagrams are used to show
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Endothermic: a type of reaction which has energy going into the reaction, however, it uses more energy than it releases in the reaction.
Exothermic: a type of reaction that has energy coming out of the reaction, therefore more energy is released than used in the reaction.
Propanol: a transparent/colorless liquid used as a solvent and antiseptic.
Calorimeter: an apparatus for measuring the amount of heat involved in a chemical reaction or other processes.
Research Question: How much heat/energy is produced during the combustion of propanol?

Variables
Independent variable
What: Amount of alcohol burnt. ( Either 4ml or 8 ml )
How: Each trial will have a different amount of alcohol using the measuring beaker to measure amount
Why: To compare the difference of heat produced

Dependent variable
What: The amount of heat produced during combustion
How: Using the thermometer to find the temperature of water plus using calorimeter to find precise amount of heat/energy
Why: To find out the heat of propanol

Controlled variables
What : How :The apparatus to keep experiment insulaHow: Use same equipment that we built as

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