Water and Chemical Elements

Bonds hold together the atoms within water, whereas water molecules are held together via intermolecular forces.

Which of the following correctly states the type of bond between atoms in a water molecule?

• ionic bond
• polar bond

• covalent bond
• hydrogen bond

Bonds hold together the atoms within water, whereas water molecules are held together via intermolecular forces.

Which of the following correctly states the type of bond between the water molecules?

• ionic bond
• polar bond

• covalent bond
• hydrogen bond

The electrons in the bonds between oxygen and hydrogen of water molecules are shared unequally.

What is the charge of oxygen atom in the water molecule?

• partially positive

• partially negative

• neutral

The electrons in the bonds between oxygen and hydrogen of water molecules are shared unequally.

What is the charge of hydrogen atom in the water molecule?

• partially positive

• partially negative

• neutral

The unequal distribution of charge means that water is a

• nonpolar molecule
• ionic compound
• polar molecule
• hydrophobic substance

High energy is needed to break the weak intermolecular force between the water molecules before thei kinetic energy can increase.

What is bond that gives water this high specific heat capacity properties?

• Ionic bonds
• Van der Waals forces
• Covalent bonds
• Hydrogen bonds

How do the thermally stable water is beneficial to the living organisms?

i) Aquatic birds and mammals expend less energy on thermoregulation during homeostasis

ii) Maintain optimal enzymatic activity in aquatic organisms, despite external temperature change
iii) Allow the heat from the body to lose to the environment faster during extreme heat
iv) Allow the body to absorb heat from the environment faster during extreme cold

• i and ii

• i and iv

• ii and iii

• iii and iv

• all of the above

What are the examples of benefits of water having high heat of vaporization properties in animals?

• Urinating

• Panting

• Drinking

• Sweating

• Transpiration

What are the examples of benefits of water having high heat of vaporization properties in plants?

• Urinating

• Panting

• Drinking

• Sweating

• Transpiration

Forces of attraction between molecules of the same type is known as

• Adhesion
• Attraction
• Repulsion
• Cohesion