help!

[emilyjohnson]

1.Diamond and graphite are both forms of carbon. Diamond is very hard. Graphite is soft and flaky. How could these different properties be exp?

1. They have different submicroscopic arrangments of the carbon atoms.
2.They must contain other elements
3.They have the same macroscopic properties
4.They have diff. compositions

2.which has the most mass?
1. 1 kg of cotton balls that fill a small pillow
2.a 1-kg lead cube, 4.44 cm per side
3.1 kg of water that fills a 1-liter bottle
4.they are all the same

3. Of the materials in question 2, which has the greatest density?
1.cotton balls
2.lead
3.water
4.they are all the same

[kingchemist]

Diamond and graphite, both forms of carbon have different atomic arrangements - tetrahedral in diamond; hexagonal rings making planes with weak attraction between layers

1kg is the same mass whatever the substance. However density will be different as the one with the smallest volume has the greater density.