Question

Which of the following solids would have the highest melting point?

A. NH3
B. H2O
C. C6H6
D. LiCl

Answer 1

@kristinatime what do you think the answer is?

Answer 2

I think it's D

Answer 3

interesting, what is your reasoning?

Answer 4

@kristinatime tell me your reasoning and I'll walk you through it

Answer 5

I'm not sure I just think lithium would create a high melting point, I'm terrible at chemistry so I need help explaining these things /:

Answer 6

Melting point depends on intermolecular attractions and the crystalline structure.

Answer 7

Well what do you guys think it is?

Answer 8

Thing is (it's melting point not boiling point) so @kristinatime whenever you have to determine whether a compound has a higher melting point, always identify which compound is found in the solid phase.

Answer 9

because essentially we're going from solid to liquid i.e. MELTING.

Answer 10

Oh okay I'm understanding it a bit better

Answer 11

why would the other answers not make sense @kristinatime? could you tell me a little about those?

Answer 12

Actually LiCl is a gas element so that wouldn't have a melting point lol so I'm not sure. Water can't melt so it isn't h2o. So...

Answer 13

It has to be NH3 or C6H6

Answer 14

@kiristinatime dont confuse yourself.

remember LiCl is a solid at Room-temperatue. why? because it's ionic, Li is a metal and Cl is a non metal. whenever we have a metal and a non metal the result is an ionic compound.

now
Water, Benzene, and ammonia are all liquids at room temperature. that's because of the type of bonding too as well.

Answer 15

@kristinatime

Answer 16

So it would be LiCl?

Answer 17

@kristinatime


i'll give you another one


Which has the highest melting point and why?

KCl
Cl2
C6H6
H2O

Answer 18

So would it be LiCl or no? And hmmmm

Answer 19

Not sure maybe C6H6

Answer 20

always provide your reasoning

Answer 21

I honestly don't know

Answer 22

LOL why won't you tell me if I was right on the first question?

Answer 23

I believe it's lithium because ionic compounds are solids at room temperature right? because they have an electrostatic attraction. between the metal and non metal. does this make sense?

Answer 24

Makes total sense actually

Answer 25

so yeah i tried to give you another problem I posted it above

Answer 26

so tell me why the others aren't good answers and go through them individually @kristinatime

Answer 27

Uhhh idk haha

Answer 28

the biggest concept with melting point is that you need to ask yourself what compounds are solids at room temperature right? because solid --> liquid that's what melting is.

Answer 29

In order to answer questions like these, you need to know about intermolecular forces, rank these in terms of strength, and be able to identify which compounds have which.



read this http://www.chem.sc.edu/faculty/shimizu/333/Chem_333/2b.i.html