I think 3 of them are its been 1 half years since ive done this i dont take chemistry anymore
Answer:
Mass: 981.0 g
Density: 5.61 g/cm^3
Hardness: = 2.5 - 3
Unknown material: Chalcocite
Explanation:
Answer:
KBr
Explanation
KBr is an ionic compound which have very high BP since they exist as 3D crystals
Methyl Bromide, CH3Br. is a covalent compound which have low BP since they exist as individual molecules
I believe the answer is A, if they have a stronger connection lower the vapor pressure so higher the boiling point
Answer:
Hydrogen
Explanation:
Hydrogen is the only non metal in group on of the period table of elements.