Question 17N.2.SL.TZ0.03
| Date | November 2017 | Marks available | [Maximum mark: 5] | Reference code | 17N.2.SL.TZ0.03 |
| Level | SL | Paper | 2 | Time zone | TZ0 |
| Command term | Draw, Explain | Question number | 03 | Adapted from | N/A |
The figure represents a water molecule.
Draw a second water molecule to show how bonds can form between water molecules, including the name of the bond.
[2]
a. similar water molecule drawn with oxygen on one molecule facing hydrogen on the other water molecule
b. one hydrogen bond drawn as a dotted/dashed line between the two water molecules and labelled
O and H do not have to be labelled but must be positioned correctly
eg :
Can get this mark even if atoms incorrect
Water has important solvent properties. Explain these properties using an example to illustrate your answer.
[3]
a. water molecule is polar
OR
water has «weak» positive and negative charges
c. water forms hydrogen bonds with polar substances
d. positive/hydrogen side/pole of water attracted to negative ions
OR
negative/oxygen side/pole attracted to positive ions
e. glucose/other example dissolves because it is polar
OR
sodium chloride/other example dissolves because ions are attracted to water
[Max 3 Marks]
