Which of the following apply to the property of hardness. select all that apply. hardness is determined through a complicated process that requires expensive instruments. hardness is a physical property. hardness is indicative of the strength of chemical bonds between elements. friedrich mohs developed the standard hardness scale. diamond can scratch quartz.

The correct answers are options  B, D and E.

The property of hardness are:

Hardness is a physical property.

Friedrich Mohs developed the standard hardness scale.

Diamond can scratch quartz.

Mohs' scale of hardness is used to rate minerals with 1 being softest and 10 being hardest. Determination of hardness requires no expensive instrument. It is a physical property that is tested by scratching one substance over the surface of another.

5 structural isomers

the isomers are:

n-exane :   ch3ch2ch2ch2ch2ch3

2-methylpentane :   ch3ch(ch3)ch2ch2ch3

3-methylpentane :   ch3ch2ch(ch3)ch2ch3

2,3-dimethylbutane :   (ch3)2chch(ch3)2

2,2-dimethylbutane :   (ch3)3cch2ch3