1. Why do scientists need an accurate atomic model?

The atom is the most important structure in the universe.

It allows scientists to predict things about objects that are too small to see.

Models allow scientists to avoid having to do real experiments.

The atom cannot be divided into smaller particles.

2. Which is a correct step in a scientific experiment involving acids and bases?

Mixing two acids to form a neutral solution.
Using an indicator to measure the hydrogen ion concentration of a solution.
Pouring acid onto an indicator to measure the pH of the indicator.
Dissolving an indicator in an acidic solution to increase its pH.

Atomic models are crucial to the scientific study of atoms. Through models, we represent atoms that we actually cannot see. Observation based study and testing is done through that model which helps us find flaws in one model so that a better model is made. In this way, it is helpful to study about atoms through atomic models.

2. Answer:

The correct step in a scientific experiment involving acids and bases is:

Using an indicator to measure the hydrogen ion concentration of a solution.

Explanation:

Two acids can never neutralize each other. The pH of a neutral solution is 7. Whereas pH of an acid is always less than 7.

Indicators are used to measure the pH of solutions. They give different colors in solutions with different solutions. So, in an experiment to check if the solution is acidic or basic, we need to measure its hydrogen ion concentration for which an indicator is used.