Question

a science class tested ways to clean water after an oil - spill by adding 100 ml of vegetable oil, 100 ml of engine oil, and 800 ml of water in a rectangular plastic container. floating wooden cubes (5 cubic centimeters each) representing animals were used for removing as much oil as possible in a 20 - minute period, leaving \clean\ water. the results of the \clean - up\ are presented in the chart. based on the results above, which group’s data are obviously unreliable? group 1 group 2 group 3 group 4

Explanation:

Step1: Note the amounts of oil

There are 100 mL of vegetable - oil and 100 mL of engine - oil available for cleanup.

Step2: Analyze group 2 data

Group 2 claims to have removed 110 mL of vegetable oil, which is more than the available 100 mL of vegetable oil. This is not possible in the context of the experiment.

Answer:

B. group 2