Crystals 2

Question 1

If there is a more stable form of the polymorph what will happen

Answer 1

nature edeavours to transform one polymorph into the most thermodynamically favoured direcction of change

Question 2

What are the steps of crystallization from solution

Answer 2

dissolve solid in solvent until a saturated solution is achieved

remove excess solid from saturated solution

allow solution to cool or evaporate solvent

supersaturated solution achieved

nucleation & crystal growth

Question 3

what happens to a non saturated solution as it cools

Answer 3

dissolution

Question 4

what happens to a super saturated solution as it cools

Answer 4

seed crystals will grow but no spontaneous crystal growth

Question 5

what property must a solution have before crystallization can occur

Answer 5

supersaturated

Question 6

what are solvates

Answer 6

crystal structures where a solvent is actually incorporated into the crystal structure itself

which is not adsorbed or absorbed

Question 7

when can solvents be incorporated during crystallisation

Answer 7

exposing a crystal to solvent or during crystallisation

Question 8

What are hydrates

Answer 8

solvates where the solvent is water

Question 9

How can water be removed from a hydrate

Answer 9

heating inducing a phasse transition back to an anhydrous form in the process

Question 10

What is a co crystal

Answer 10

solid form constituting tow or more neutral compounds