Question

water type dissolving time (s) average dissolving time (s) trial 1 trial 2 trial 3 room temperature water (23.9°c) 38.5 37.2 39.3 38.3 seconds hot water (50.0°c) 22.7 25.6 24.8 24.4 seconds cold water (2.1°c) 120.7 119.5 121.3 120.5 seconds based on the data above, identify the test variable (independent variable). the type of substance dissolved. the average dissolving time of the substance. the starting temperature of the water. the dissolving time of the substance.

Explanation:

In an experiment, the independent variable is the factor that is changed or manipulated. Here, the water temperature (room - temperature, hot, cold) is being changed. The dissolving time (average or per - trial) is the dependent variable (it depends on the water temperature). The type of substance dissolved is not mentioned as being varied in the table.

Answer:

The starting temperature of the water.