Question

A group of students is investigating how the addition of salt impacts the floatation of an egg in water. Four identical cups were taken for the experiment. The data of the experiment are shown.

Experimental Record
Cup
Amount of Water (mL)
Amount of Salt (g)
Level of Egg above Water
1
450
0
Sinks to bottom
2
450
68
2 cm
3
450
136
3 cm
4
450
272
4 cm

Which cup acts as a control group?

1
2
3
4

Answer 1

cup one is the cup do to there being no salt

Answer 2

Cup 1 acts as a control group.

Explanation:

Control group: The group used in the experiment by the researchers in which no change in the variable is done. It is then set as a benchmark for the groups which are being tested.

We are given 4 groups which are being experimented for the flotation of an egg in water.

Since in Cup 1, there is no addition of salt

So, there is no change in the variables.

So, by definition of control group .

So, cup 1 acts as a control group since there is no change in the variable .

Hence, the correct answer is Option 1.

Cup 1 acts as a control group.