Why does bromine add faster to a trisubstituted double bond than a monosubstituted double bond to produce dibromides?

This chart represents the melting point of several substance. what besy explains the high melting point of the salt?

Asap! how do you lengthen a pattern piece? (family and consumer science, sewing)

Nebulae are enormous clouds in outer space. they are made mostly of hydrogen gas, helium gas, and dust. some nebulae glow brightly, while others do not. the stars that people see are huge, bright balls of glowing gas. they are made mostly of hydrogen and helium. which statement correctly describes other ways in which nebulae and stars are different? a. stars can form inside a nebula but a nebula can never be produced by any star. b. a star always has a higher density than a nebula. c. stars can never form inside a nebula but a nebula can be produced by any star. d. a nebula always has a higher density than a star.