Reflection Essay on Chapter 3

Which property of water allows a paper towel to pick up a puddle of water?

– water’s high surface tension
– adhesion of water molecules to other kinds of molecules
– water’s high heat of vaporization

Water adheres to the cellulose molecules in a paper towel, allowing the towel to pick up a puddle of water. This is similar to the adhesion between water molecules and cellulose in cell walls responsible for water transport in plants.
Which property of water allows a water strider to walk on water?

– water’s high surface tension
– the formation of covalent bonds between water molecules
– adhesion of water molecules to other kinds of molecules

Water’s high surface tension, related to its cohesion, makes water behave as though coated with an invisible film.
In the term trace element, the adjective trace means that

– the element is required in very small amounts.
– the element passes rapidly through the organism.
– the element enhances health but is not essential for the organism’s long-term survival.
– the element is very rare on Earth.
– the element can be used as a label to trace atoms through an organism’s metabolism.

the element is required in very small amounts.
Compared with 31 P , the radioactive isotope 32 P has

– a different atomic number.
– one more neutron.
– one more electron.
– a different charge.
– one more proton.

one more neutron.
We can represent atoms by listing the number of protons, neutrons, and electrons-for example, 2p+, 2n0, 2e- for helium. Which of the following represents the 18O isotope of oxygen?

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