Select all that apply to the property of hardness.

Hardness is a physical property

Friedrich Mohs developed the standard hardness scale.

Diamond can scratch quartz.

Explanation:

hope it helped! ^_^

hardness is a physical property

hardness is indicative of the strength of chemical bonds between elements.

hardness is a determined through a complicated processs that requires expensive instruments.

Friedrish Mohs developed the standard hardness scale.

Diamomd can scratch quartz

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.