Question

properties of water pogil
what makes water so special?
why?
when you hear that nasas space probes are looking for \evidence of life\ on other planets, do you know what that means? they are looking for evidence of liquid water. water is fundamental for all life; without it every living thing would die. water covers about 70% of earths surface and it makes up 65 - 75% of our bodies (82% of our blood is water). even if water might seem boring to you - no color, taste, or smell - it has amazing properties that make it necessary for supporting life.
model 1 - the molecular structure of water
electron density model of h₂o

1. how many hydrogen atoms are in a molecule of water?
2. how many oxygen atoms are in a molecule of water?
3. what holds the hydrogen atoms to the oxygen atom?
4. the shading around the molecule represents the relative density of electrons shared by the atoms. what does this indicate about the density of electrons around the oxygen atom as compared to the density of electrons around the hydrogen atoms?
5. where is the majority of negative charge on the water molecule?

model 2 - attraction of water molecules

Explanation:

Step1: Identify from the molecular structure

A water molecule's formula is H₂O, so there are 2 hydrogen atoms.

Step2: Identify from the molecular structure

A water molecule's formula is H₂O, so there is 1 oxygen atom.

Step3: Recall bond - type knowledge

Covalent bonds hold the hydrogen atoms to the oxygen atom in a water molecule.

Step4: Analyze electron - density shading

The shading around the oxygen atom is denser, indicating a higher electron density around the oxygen atom compared to the hydrogen atoms.

Step5: Consider electronegativity and electron - density

Since oxygen is more electronegative and has higher electron - density, the majority of negative charge is on the oxygen atom.

Answer:

1. 2
2. 1
3. Covalent bond
4. The electron density around the oxygen atom is higher than that around the hydrogen atoms.
5. On the oxygen atom.