task 2: properties of water video
watch the properties of water video by the amoeba sisters on youtube and answer the following questions.
full url: https://www.youtube.com/watch?v=3jwagwky98c&vl=en
tiny url: https://tinyurl.com/v5zgbwwt
6. why do water molecules easily bond together?
7. what type of chemical bond exists between two water molecules?
8. what is the difference between adhesion and cohesion?
9. describe how water moves up a tree through the xylem?
10. describe surface tension.
11. how does water behave when it freezes?

Question

Accepted Answer

### Question 6
# Brief Explanations:
Water molecules are polar, meaning they have a slightly positive end (hydrogen atoms) and a slightly negative end (oxygen atom). The positive end of one water molecule is attracted to the negative end of another, forming hydrogen bonds, which makes them bond easily.
# Answer:
Water molecules are polar (have partial positive and negative charges), so the positive hydrogen of one molecule is attracted to the negative oxygen of another, forming hydrogen bonds, allowing easy bonding.

### Question 7
# Brief Explanations:
Between two water molecules, the bond is a hydrogen bond. This is because the polar nature of water (partial + on H, partial - on O) leads to an electrostatic attraction between the H of one molecule and O of another.
# Answer:
The chemical bond between two water molecules is a hydrogen bond.

### Question 8
# Brief Explanations:
Cohesion is the attraction between molecules of the same substance (e.g., water molecules sticking to other water molecules). Adhesion is the attraction between molecules of different substances (e.g., water molecules sticking to the walls of a glass tube or plant xylem).
# Answer:
Cohesion: attraction between same - substance molecules (water - water). Adhesion: attraction between different - substance molecules (water - other materials like xylem or glass).

### Question 9
# Brief Explanations:
Water moves up a tree's xylem due to a combination of factors. Cohesion (water molecules sticking to each other) and adhesion (water molecules sticking to the xylem walls) work together in capillary action. Also, transpiration (water evaporation from leaves) creates a negative pressure (tension) that pulls water up from the roots, along with the cohesive and adhesive forces.
# Answer:
Water moves up xylem via cohesion (water - water attraction), adhesion (water - xylem attraction, capillary action), and transpiration - pull (evaporation from leaves creates tension that pulls water up from roots).

### Question 10
# Brief Explanations:
Surface tension is the property of a liquid's surface that allows it to resist an external force. In water, it occurs because of cohesion (water molecules at the surface are more strongly attracted to adjacent water molecules, creating a "skin - like" effect). This allows small insects to walk on water, for example.
# Answer:
Surface tension is the tendency of a liquid's surface to resist external force, resulting from cohesive forces between liquid molecules (water molecules at the surface are more attracted to each other, forming a "film" that can support light objects like water striders).

### Question 11
# Brief Explanations:
When water freezes, its molecules form a crystalline structure (hexagonal lattice) and move further apart compared to liquid water. This makes ice less dense than liquid water, so it floats. Also, the freezing process releases heat (latent heat of fusion).
# Answer:
When water freezes, it forms a hexagonal crystalline structure, becomes less dense (so ice floats), and releases heat (latent heat of fusion). The molecules are more spread out in ice than in liquid water.

Sovi.AI - AI Math Tutor

QUESTION IMAGE

Question

Explanation:

Question 6

Answer:

Question 7