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Give an example of a scientific investigation design with appropriate constants amd variables independent variables and dependent variables
Accepted Answer
Investigating the Effect of Temperature on the Rate of a Chemical Reaction
Independent Variable: Temperature (°C)
Dependent Variable: Reaction Rate (e.g., measured by the time it takes for a specific amount of product to form)
Constants:
Concentration of Reactants
Volume of Reactants
Catalyst (if used)
Surface Area of Reactants (if applicable)
Experimental Design:
1. Prepare several identical solutions of the reactants at a fixed concentration.
2. Divide the solutions into separate test tubes or containers.
3. Place each test tube/container in a water bath maintained at a specific temperature (e.g., 20°C, 30°C, 40°C).
4. Start the reaction simultaneously in each container by adding the catalyst or initiating the reaction in some other way.
5. Measure the time it takes for a specific visual change or a change in a measurable property (e.g., color change, pH change, gas evolution) to occur, indicating the completion of the reaction.
6. Repeat the experiment several times for each temperature to ensure reliable data.
7. Analyze the data by plotting the reaction rate (e.g., 1/time) against the temperature. The graph should show a clear relationship between the two variables.
Independent Variable: Temperature (°C)
Dependent Variable: Reaction Rate (e.g., measured by the time it takes for a specific amount of product to form)
Constants:
Concentration of Reactants
Volume of Reactants
Catalyst (if used)
Surface Area of Reactants (if applicable)
Experimental Design:
1. Prepare several identical solutions of the reactants at a fixed concentration.
2. Divide the solutions into separate test tubes or containers.
3. Place each test tube/container in a water bath maintained at a specific temperature (e.g., 20°C, 30°C, 40°C).
4. Start the reaction simultaneously in each container by adding the catalyst or initiating the reaction in some other way.
5. Measure the time it takes for a specific visual change or a change in a measurable property (e.g., color change, pH change, gas evolution) to occur, indicating the completion of the reaction.
6. Repeat the experiment several times for each temperature to ensure reliable data.
7. Analyze the data by plotting the reaction rate (e.g., 1/time) against the temperature. The graph should show a clear relationship between the two variables.
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