A beaker is half-filled with water. A small amount of potassium permanganate is placed at the centre of the bottom, and a candle is placed below the centre of the beaker. On heating, the coloured streak moves upward through the middle and then moves downward along the sides.
Answer the given questions with the correct answers:
1. What does the upward movement of the coloured streak in the middle indicate? -
2. If the candle is placed below one side of the beaker instead of the centre, which observation would be most reasonable? -
3. Which observation would provide the strongest evidence that convection is taking place? -
4. What would most likely happen if the heating were continued for sufficient time? -