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makvit [3.9K]
3 years ago
8

Small insects can walk across the surface of calm water. Their feet push the surface of the water down slightly, somewhat like a

person walking across a trampoline, but they do not break the surface. What is the best explanation for why this happens

Biology
1 answer:
Liono4ka [1.6K]3 years ago
5 0

Answer:

Explanation:

Molecules within a liquid are pulled in all directions by intermolecular forces; there is no tendency for them to be pulled in any one way. However, molecules at the surface are pulled downward and sideways by other molecules, but not upward away from the surface. These intermolecular attractions thus tend to pull the molecules into the liquid and cause the surface to tighten like an elastic film.

A measure of the elastic force in the surface of a liquid is surface tension. The <em>surface tension</em><em> is the amount of energy required to stretch or increase the surface of a liquid by a unit area</em>.  Surface tension enables small insects, like the water strider, to “walk” on water.

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What is energy coupling?
vagabundo [1.1K]

Answer:

c: the use of energy released from an exergonic reaction to drive an endergonic reaction.

Explanation:

<em>Energy coupling is a process involving two reactions whereby one of the reactions generate energy, and the generated energy is used to drive the other reaction. </em>

A reaction during which energy is generated is referred to as exergonic reaction while one in which energy is consumed is known as endergonic reaction. Hence, energy coupling can also be viewed as a process linking exergonic and endergonic reactions whereby the energy released in the former is used up by the latter.

A good example is illustrated by the light dependent and light independent reactions of photosynthesis during which the ATP and NADPH produced during the light dependent reaction is used to fix carbon dioxide in the light independent reaction.

<em>The correct answer is C.</em>

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4 0
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neonofarm [45]

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Hey there!

An ion is any atom with an electric charge. This can be negative or positive.

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Hope this helps!

8 0
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