Question

16 what property of substances helps scientists predict material behavior?
a changeable atomic structure
b varied properties based on quantity
c consistent atomic and molecular structure
d variable physical states

Explanation:

The consistent atomic and molecular structure of substances provides a basis for scientists to understand and predict how materials will behave. A changeable atomic structure (A) would make prediction difficult. Properties based on quantity (B) are not the fundamental aspect for predicting basic material - behavior. Variable physical states (D) are a result of other factors and not the main property for prediction.

Answer:

C. Consistent atomic and molecular structure