Question

1. choose the best answer. the smallest unit of an element that maintains all of the chemical properties of that element is a(n) __. molecule mixture atom compound 15. choose the best answer. __ is an approximation to consider when developing a model. scale organics simplicity variable

Explanation:

1. An atom is the smallest unit of an element that retains all of its chemical properties. A molecule is made up of two or more atoms, a mixture is a combination of different substances, and a compound is a substance composed of two or more different - type atoms.
2. When developing a model, scale is an approximation to consider as it represents the ratio between the model and the real - world object or phenomenon. Organics refer to carbon - based compounds, simplicity is a general principle but not an approximation in the context of model - making like scale, and a variable is a factor that can change in an experiment or model but not an approximation like scale.

Answer:

1. C. atom
2. A. Scale