25 T2 L11 Why does ice float?

What type of bonds do water molecules have between them?

Watter tipe bindings het watermolekules tussen hulle?

(a)  

In a covalent bond, what is shared between ATOMS in the molecules?

Wat word in 'n kovalente binding gedeel tussen ATOME in die molekules?

(a)  

What do you notice about the molecules connected by hydrogen bonds?

Wat merk jy op omtrent die molekules wat deur waterstofbindings verbind word?

Answer explanation

The molecules are arranged in a pattern.

The hydrogen atom is always next to an oxygen atom.

Die molekules is in 'n patroon gerangskik.

Die waterstofatoom is altyd langs 'n suurstofatoom.

What is the temperature at which the kinetic energy between the molecules of water is less that the forces of the hydrogen bonds?

Wat is die temperatuur waarby die kinetiese energie tussen die molekules water minder is as die kragte van die waterstofbindings?

• 10°C

• 4°C

• 0°C

• 25°C

Is the structured arrangement of ice molecules less or more dense than liquid water?

Is die gestruktureerde rangskikking van ysmolekules minder of meer dig as vloeibare water?

• more | meer

• less | minder

Would life on earth be as it is now if ice were more dense than liquid water? Explain your answer.

Sou lewe op aarde wees soos dit nou is as ys digter as vloeibare water was? Verduidelik jou antwoord.

Answer explanation

No, it would not be the same.

The bottom of oceans and rivers would freeze and life there would not be or not be the same as it is now.

The ice caps would not reflect heat so the temperatures and the atmosphere would be significantly different.

Nee, dit sou nie dieselfde wees nie.

Die bodem van oseane en riviere sou vries en die lewe daar sou nie meer dieselfde wees as wat dit nou is nie.

Die yskappe sal nie hitte weerspieël nie, so die temperature en die atmosfeer sal aansienlik verskil.