The Effect Of Temperature On A Chemical Reaction

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Leonardo Cufone
Aim: to determine the effect of temperature on a chemical reaction.
Hypothesis: If the temperature (I.V.) of materials in the reaction are increased, the reaction time (D.V.) will decrease.
Variables: In this experiment, the temperature (in degrees Celsius) of the chemicals is the independent variable. To change the temperature, the materials are placed in a bath of water being heated by a hotplate.
The reaction time (in seconds) is the dependent variable of this experiment. This will be changed by the temperature of the chemicals, and as it is affected by the independent variable it is considered the dependent variable.
The volume of chemicals (in mL) is the controlled variable of the experiment. As it will be the same in each trial and will not be changed, it is considered the controlled variable. Another controlled variable is the equipment that is used. For each trial the same equipment is always used, and therefore is also a controlled variable. The type of chemicals themselves are also controlled as for each trial they are the only chemicals used.
Safety: There are two potential hazards in this experiment.
Hydrochloric acid (HCl) has risks as it is a corrosive compound. Corrosive compounds, including HCl, can cause injuries such as burning and eating away skin and eyes. To prevent such injuries, do not come into physical contact with HCl. Wear safety glasses, safety gloves and lab clothing.
Sodium thiosulfate (Na2S2O3) is risky as it is a toxic

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