Write a clear aim for Prac report- How does temperature affect the rate of reaction
A hypothesis and/or prediction-
The experimental method used and the reasons for choosing this method
Information about:
The Method
Using a measuring cylinder, add 50 cm3 of dilute sodium thiosulfate solution to a conical flask.
Cool the sodium thiosulfate solution to 10°C.
Place the conical flask on a piece of paper with a black cross drawn on it.
Using a different measuring cylinder, add 10 cm3 of dilute hydrochloric acid to the conical flask. Immediately swirl the flask to mix its contents, and start a stop clock.
Look down through the reaction mixture. When the cross can no longer be seen, record the time on the stop clock.
Measure and record the temperature of the reaction mixture, and clean the apparatus as directed by a teacher.
Repeat steps 1 to 5 with different starting temperatures of sodium thiosulfate solution (30°C, 40°C, 50°C).
the independent variable, dependent variable, and controlled variables
Analyse and evaluate the results to identify any trends/patterns/relationships that may exist between the variables under investigation
Only mention correlations/links between the variables if there is evidence of this in the results obtained
Link the results to any relevant scientific concepts
Keep your conclusion brief and ensure it responds to the hypothesis and/or the investigation question
Only determine your conclusion from the data obtained in the investigation
Answers
Answer:
Explanation:
How does the temperature affect the rate of a chemical reaction?
December 1, 2020 by Veerendra
How does the temperature affect the rate of a chemical reaction?
Effect of temperature on the rate of reaction:
When the temperature increases, the rate of reaction also increases.
(a) For example, two sets of experiments are carried out using the reacting conditions below:
Set I: 1 g of granulated zinc and 20 cm3 of 0.2 mol dm–3 hydrochloric acid at 60°C
Set II: 1 g of granulated zinc and 20 cm3 of 0.2 mol dm–3 hydrochloric acid at 30°C
(b) The rate of reaction of set I is higher than that of set II.
(c) This is because the temperature (60°C) of the reacting mixture in set I is higher than the temperature (30°C) of the reacting mixutre in set II.
When investigating experimentally the effect of temperature on the rate of reaction,
the experiment is repeated a few times, each time using a different temperature of a reactant.
all the other factors/conditions are kept constant in all the experiments.
The following shows an example of the effect of temperature on the rate of reaction. Table shows the method to derive the shapes of curves plotted for two sets of experiments.