A1.1 Water (IB HL)

What is the charge on the oxygen atom in a water molecule?

• ẟ+

• ẟ-

• Positive

• Negative

What is the charge on the hydrogen atoms in a water molecule?

• ẟ+

• ẟ-

• Positive

• Negative

What type of bond is responsible for the cohesion between water molecules?

Label the types of bonds present in the image.

a

b

Hydrogen bond

Covalent bond

Hydrophobic interactions

Polar bond

Ionic bond

Tags

NGSS.HS-PS1-3

Label the ẟ+ and ẟ- atoms

a

b

ẟ-

ẟ+

Tags

NGSS.HS-PS1-3

Which characteristics make a planet likely to be able to support life?

• Found within the Goldilocks zone

• Large enough gravitational field to retain an atmosphere

• Presence of oxygen

• Presence of liquid water

Tags

NGSS.MS-ESS2-4

The density of water is ​ (a)   than that of air, meaning it is ​ (b)   buoyant. It has a ​ (c)   dynamic viscosity than air, meaning organisms living in water are adapted to be ​ (d)   .

• higher
• more
• hydrodynamic
• less
• lower
• aerodynamic

Tags

NGSS.HS-ESS2-5

Water transfers heat​ faster than air and can therefore be said to have a (a)   ​ thermal conductivity. Aquatic animals, therefore, need ​ (b)   insulation to ​ (c)   heat loss when swimming.

• higher
• thicker
• reduce
• lower
• thinner
• increase

Tags

NGSS.HS-PS3-4

Aquatic habitats have a ​ (a)   stable temperature profile than terrestrial habitats, as water requires a ​ (b)   input of energy compared to air, to produce the same temperature change. This is because air has a ​ (c)   specific heat capacity than water.

• more
• larger
• lower
• less
• smaller
• higher

Tags

NGSS.HS-PS3-4

Water at 25^oC feels colder to the skin than air at the same temperature because water has a higher​ (a)   than air.

• thermal conductivity
• Specific heat capacity
• density
• viscosity