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Answer:

The effect of water temperature on dissolving time of sugar

• Independent Variable: Water temperature (°C)
• Dependent Variable: Dissolving time of sugar (seconds)
• Controlled Variable: The amount of sugar, the type of sugar, the stirring rate, the initial water temperature, the equipment used for measurement, the purity of the water.

Formulate Hypothesis:

• As the water temperature increases, the dissolving time of sugar will decrease.

Procedures:

• Prepare a container of water at a controlled temperature, for example, 25 °C

• Measure and record the initial water temperature

• Weigh a specific amount of sugar, for example, 10 g
• Add the sugar to the water and start timing

• Stir the mixture until all the sugar has dissolved
• Record the dissolving time

• Repeat the experiment at different water temperatures, for example, 30 °C, 35 °C, 40 °C and 50 °C

• Record the dissolving time at each temperature
• Compare the dissolving time at different temperatures and analyze the results

It's important to mention that this is just an example of a general procedure. Depending on the specifics of the experiment, you may need to make adjustments or add more steps to the procedure.