Scenario: You are testing two different household solutions with your cabbage indicator, using the color key to the right.

The second solution turns purple. A possible hydrogen ion concentration for this solution is:

A. 1 × 10-2 M

B. 7× 10-3 M

C. 1 × 10-7 M

D. 7 × 10-4 M

it's c. elements are placed in rows based on how may valencies electrons have.

answer : a model is often used to explain and make things easier to understand when any scientific topic needs to be demonstrated and explained.

as in this case where a scientist wants to use a model to present the results of his detailed scientific investigation. he should do it as it will him to make the audience understand the concept in a much better way. also, it can be changed according to new scientific understandings.

56 moles of   lieter in chemistry