2.2 - Water - Key terms

Question	Answer
Water molecule	A polar molecule made of: 1 oxygen atom, and 2 hydrogen atoms. Image: e067f477-93ac-42d0-979e-ea6f1d31abdd (image/jpg)
Polarity	Having positively and negatively charged areas because of an uneven distribution of electrons.
Negative pole	Area with more electrons. In water, the area around the oxygen atom.
Positive pole	Area with fewer electrons. Near the hydrogen atom nuclei of water molecules.
Hydrogen bond	A weak bond formed between polar water molecules.
Cohesion of water molecules is high...	...because H-bonds make water molecules stick to each other more strongly. It causes surface tension.
Water has high specific heat capacity...	...because some heat is used to break H-bonds, so more is needed to raise the temperature.
Water is an excellent solvent...	...because polar water molecules can dissolve a large range of substances.
Water has dipolarity...	...because water molecules contain both positive and negative charges.
Water is a good coolant in sweat...	...because it can easily dissolve glucose, sodium chloride, oxygen, and many amino acids.

Resource summary

	Created by Ella-mentary almost 9 years ago