Question

1. choose all that apply.

which two of these are correct examples of chemical properties?
density
reactivity
color
flammability

1. choose the best answer.

_____ is an approximation to consider when developing a model.
organics
scale
variable
simplicity

Explanation:

• Chemical Properties: Chemical properties describe how a substance interacts with other substances to form new substances. Reactivity (ability to react with other substances) and flammability (ability to burn in the presence of oxygen) are chemical properties as they involve chemical changes.
• Density and Color: These are physical properties. Physical properties can be observed or measured without changing the substance's chemical composition.

• Model Development - Simplicity: When developing a model, simplicity (keeping the model as uncomplicated as possible while still accurately representing the system) is an approximation to consider. A simple model is often more understandable, easier to use, and can still capture the essential features of what is being modeled. Organics refer to a class of compounds, scale is about size - related aspects, and variable is a quantity that can change, but simplicity is the key approximation in model development among the given options.

Answer:

1. B. reactivity, D. flammability
2. D. Simplicity