Question

You want to test the effect of water temperature on the rate of sugar

dissolution. Which of the following is an example of a controlled experiment
to test this?
A. The temperatures of five beakers of 250 mL of water are kept
constant, and 10 g of sugar is added to each beaker.
B. The temperatures of five beakers of 250 mL of water are varied,
and 10 g of sugar is added to each beaker.
C. The temperatures of five beakers of 250 mL of water are varied,
and 10 g of sugar is added to each beaker while three of the
beakers are stirred.
D. The temperatures of five beakers of 250 mL of water are varied,
and different amounts of sugar are added to each beaker.

Answer 1

Answer:B

Step-by-step explanation:

You want different temperatures for each beaker but everything else the same

Answer 2

A, the temperatures of the water, the size of the beaker and the amount of sugar added to each are being controlled.