Biochemistry - Chemistry Basics

Question 1

Ion

Answer 1

An atom that has lost or gained electrons

Question 2

Isotope

Answer 2

Atoms of the same element that have a different number of neutrons

Question 3

Pure covalent bond

Answer 3

Atoms share electrons equally, electronegativity difference = 0.0-0.4

Question 4

Polar covalent bond

Answer 4

Atoms share electrons unequally (closer to more electronegative atom), electronegativity difference = 0.4-1.7

Question 5

Ionic bond

Answer 5

Transfer of electrons, electronegativity difference = 1.7-3.3

Question 6

Dipole dipole forces

Answer 6

Imbalance of charge in polar molecules, partial negative charge attracted to partial positive charge

Question 7

Hydrogen bonding

Answer 7

Strong dipole dipole force, H-N/H-O/H-F

Question 8

London dispersion forces

Answer 8

Very weak attraction between instantaneous dipoles