Question

water: a cool molecule
teen channel: science scene
while walking to school one
morning, you observe
sparkling dewdrops on a
spiderweb and stop to marvel
at their shape, becoming
completely absorbed in their
scintillations...until you notice
drops of water from the sky
splashing on your head,
sending you scurrying for
shelter. since water is all
around us, you might not
spend much time
contemplating why it acts the
way it does, but water has
many fascinating properties
the shape of water molecules helps water drops form. image
question 6
based on the article, which of these is true about surface tension?
a. it’s the cause of ice sinking to the bottom of a lake.
b. it’s the force that causes cracks and crevices in roads.
c. it’s the type of chemical bond that makes water freeze.
d. it’s the reason a drop of water has a spherical shape.
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extras

Explanation:

• Option A: Ice is less dense than water, so it floats, not sinks. Eliminate A.
• Option B: Cracks in roads are due to factors like freezing - thawing cycles (water expanding when freezing), not surface tension. Eliminate B.
• Option C: Surface tension is a property related to intermolecular forces at the surface, not a chemical bond. Chemical bonds (like covalent bonds in water) are different from surface tension. Eliminate C.
• Option D: Surface tension is the cohesive force between liquid molecules at the surface, which causes water drops to form a spherical shape (to minimize surface area). This is correct.

Answer:

D. It’s the reason a drop of water has a spherical shape.