W2L1 - Life

Question 1

In biochemical reaction what medium is the most relevant

Answer 1

Water

Question 2

Explain hydrogen bonds in water

Answer 2

Oxygen more electronegative → polar molecule → charge of molecule not evenly distributed → hydrogen bonds form between portions of different molecules with opposite charges

Question 3

What is adhesion

Answer 3

Water molecules are attracted polar surfaces e.g glass like v like

Question 4

Explain how a concave meniscus forms as a result of adhesion

Answer 4

the negative O- of water adheres/sticks (adhesive forces) to the positively charged glass and that force is stronger than the cohesive forces between water

Question 5

What is cohesion?

Answer 5

tendency for molecules to stick together due to do same IMF

Question 6

How do cohesive forces work in transpiration

Answer 6

when water leaves the plants through transpiration at the leaves, the IMF of water pulls together towards the top

Question 7

What is water tension

Answer 7

strong hydrogen bonding in water allows small weights to float on water

Question 8

How does water work as a solvent in salt

Answer 8

Na+ attracted to negative O- in H2O → Cl- attracted to H+ → form hydration shells around each ion