2. Structure Of Life Flashcards
What is an isotope?
Atoms with same number of protons but different number of neutrons
What are ionic bonds?
Electrostatic attraction between positive and negative ions (very strong)
What is covalent bonding.
Electrostatic attraction between a shared pair of electrons and the nuclei of the bonded atoms
What are van der waals forces?
Induced dipole dipole forces, very Weak intermolecular force caused by attraction between small dipoles
What is hydrogen bonding ?
Found in molecules with OH groups, strong intermolecular forces
Lone park of e on electronegative atom can form a bond w the positive dipole on hydrogen atom
What role do hydrogen bonds play in dna ?
Hydrogen bonds hold DNA together
Why are ionic and covalent bonding important for life?
Both hold proteins together
Draw a typical phase diagram
Google fact check
What’s the significance of negative melting curve in water?
Could mean there’s liquid in places with high pressure eg caves
Why may there have been water on mars in the past and not now?
Pressure on mars has significantly reduced so is now around Tripple point
What is the critical point on a phase diagram?
Point at which the phase can no longer be distinguishes knows as supercritical fluid
What is plasma?
Created by heating molecules to extreme high temps,
Gas composed of ions
99 percent of visible univers
Example of plasmas
Sun, northern lights,lightning
What is degenerate matter?
Free non interacting particles
At very high density of very low pressure
Found in white dwarfs ,
What is neutron degenerate matter?
Made from neutron degenerate gas, neutron stars smaller than white dwarfs
