What is the primary reason for the unique properties of water molecules?

• Their shape

• Hydrogen bonds

• Their size

• Their color

What type of charge does the oxygen atom in a water molecule have?

• Completely positive

• Neutral

• Partially negative

• Partially positive

What is the term for the attraction between the partially positive and partially negative ends of water molecules?

• Covalent bonds

• Ionic bonds

• Hydrogen bonds

• Metallic bonds

Why do molecules at the surface of water experience stronger intermolecular forces?

• They are warmer

• They are less dense

• They are more densely packed

• They are closer to the air

What phenomenon is caused by the stronger intermolecular forces at the surface of water?

• Evaporation

• Freezing

• Condensation

• Surface tension

What allows a water droplet to maintain its round shape?

• Temperature

• Gravity

• Surface tension

• Air pressure

Why can some insects walk on the surface of water?

• They can swim

• Surface tension

• They have special feet

• They are very light

What happens to a paperclip placed gently on the surface of water?

• It sinks immediately

• It bounces

• It dissolves

• It floats due to surface tension

What causes the bulge when a cup is filled slightly above the rim?

• Temperature

• Air pressure

• Gravity

• Surface tension

What is the term for the attraction between water molecules?

• Osmosis

• Cohesion

• Adhesion

• Diffusion