Question

A student wanted to determine the evaporation rates of three liquids. She placed 50 mL of each

liquid outside for an hour on the same day and then measured how much liquid evaporated. Which
would improve the validity of this investigation?
A. Put all three liquids outside at the same time
B. Have 2 students work
Ctogether on the investigation
Change the time for Liquid 3 to 7:00–8:00 PM
he amount of liquids used

Answer 1

Answer: I believe its C

Explanation: 2 and 3 are the same times

Its better to change the time to get different results.