LIÊN KẾT HYDRO

What is the basis of hydrogen bond?

• Attraction forces between hydrogen atom bonded with another hydrogen atom

• Attraction forces between hydrogen atom bonded with a high electronegativity atom (F, O, N)

• Attraction forces between hydrogen atom bonded with a high electronegativity atom (F, O, N) with atom (F, O, N) of another molecule

• Attraction forces between hydrogen atom with another hydrogen atom of another molecule

Tags

NGSS.HS-PS1-3

When hair is dry, protein molecules in the hair structure form hydrogen bonds with...

• other protein molecules in the same hair structure

• water molecules, H₂O

• other protein molecules from another hair structure

• water molecules, H₂O which also forms hydrogen bonds with protein molecules from another hair structure

When hair is wet, protein molecules in the hair structure form hydrogen bonds with...

• other protein molecules in the same hair structure

• water molecules, H₂O

• other protein molecules from another hair structure

• water molecules, H₂O which also forms hydrogen bonds with protein molecules from another hair structure

How do you overcome a difficulty in turning the pages of a book when the pages stick together?

• Ripping the pages until they are separated

• Shake the book until the pages separate

• Lick your finger before turning the pages

• Blow the pages as hard as you can

Which of these compounds will have the highest boiling point?

• Br₂

• C₄H₁₀

• C₃H₇OH

• Cl₂

Which of the following has the highest boiling point?

• H₂
• NH₃
• N₂
• O₂

Tags

NGSS.HS-PS1-3

What explains the very high melting and boiling point of water

• Strong dipole-dipole bonds between water molecules
• Strong hydrogen bonds between water molecules
• Dispersion forces which are present in all molecules
• Asymmetrical shape of the polar bonds.

Tags

NGSS.MS-PS1-4

Can ammonia, NH₃ form hydrogen bonds?

• Yes

• No

Proton number of Hydrogen is

• 1

• 2

• 3

• 4

Why can compounds that can form hydrogen bonds have higher boiling points than compounds that cannot form hydrogen bonds?

• Compounds that can form hydrogen bonds need to overcome weak Van der Waals attraction forces

• Compounds that can form hydrogen bonds need to overcome strong hydrogen bonds

• Compounds that can form hydrogen bonds need to overcome weak Van der Waals attraction forces and strong hydrogen bonds