Which of the following is an example of observational scientific investigation?

Question

Question 1 options:

Drying solid produced by placing it in an oven.

Noting the color of a solution when heated.

Placing test tubes in an ice bath for 15 minutes.

Mixing two reactants together in a small beaker.

Answer 1

The example of observational scientific investigation from the options provided is:

Noting the color of a solution when heated.

This involves observing and recording what happens to the solution's color due to heat without altering the solution or its components. The other options involve manipulation or changes in the state of the substances, which are more experimental rather than purely observational.