Chemical Context of Life and Importance of Water

Why are chemistry and biology inherently related subjects?

• Both are about matter ("stuff"). Bio is more specific to living things

• Chem is based on atoms/molecules and their interactions. Living things function due to atoms/molecules

• The functioning of living things is due to chemistry/chemical reactions/molecular interactions (i.e. metabolism)

• All answers are correct

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Which of the following is the smallest unit of a living thing?

• Cell

• Atom

• Molecule

• Organ

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Which of the following is an example of a compound?

• NaCl dissolved in water

• NaCl

• Na

• Air

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What are the elements of life?

• CHNOPS

• C, H, and O

• C and H₂O

• Fire, magic, thunder, and Kanye

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Which of the following statements about the nucleus of an atom is false?

• It contains protons and neutrons

• It is very small/dense

• Its overall charge is +

• It allows for the chemical behavior of the atom

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_ are the subatomic particles that determine how atoms interact with one another (and as a side note this is what we care about in biology). They exist, most accurately, in _

• Electrons, orbitals

• Electrons, energy levels (shells)

• Protons, orbitals

• Protons, energy levels (shells)

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Covalent bonds involve a _ of electrons. In a triple covalent bond (represented by three lines) there are _ total electrons involved in the bond

• Sharing, 6

• Sharing, 3

• Transfer, 6

• Transfer, 3

Which of the following statements regarding polar covalent bonds and molecules is false?

• A polar molecule must contain at least one covalent bond with an uneven sharing of electrons

• If a molecule contains polar covalent bonding then it is always polar

• Polar molecules have charged and uncharged ends

• Polar molecules never involve ionic bonding (only covalent)

• Polar molecules are always made up of all nonmetal atoms

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_ bonding is most prevalent in living things that are primarily made up of _

• Covalent, molecular compounds (molecules)

• Covalent, ionic compounds (salts)

• Ionic, molecular compounds (molecules)

• Ionic, ionic componds (salts)

Which of the following statements regarding hydrogen bonding is false?

• Despite its name it is a type of IMF not a type of bonding

• It is present between all polar molecules

• The three types are H with O, N, and F

• Hydrogen bonds do not exclusively exist between two of the same molecules

• The most significant H bonds that exist wrt to biology and living things are between water molecules