Summer 2017 Instructor: Dr. Precious Alawun Lecture Ex # 1 D. carbon, sodium, ph

Question

Summer 2017 Instructor: Dr. Precious Alawun Lecture Ex # 1 D. carbon, sodium, phosphorus, sulfur. Bio 240. Anatomy & Physiology I 13. This is an example of A. polar covalent bond B. hydrogen bond C. ionic bond D. nonpolar covalent bond 1p 1p H2 14. This is an example of A. polar covalent bond B. ionic bond C. hydrogen bond D. nonpolar covalent bond 15. Blood is a mixture that contains insoluble particles that are large enough to be visible, such as blood cells and platelets. Blood is a . A. Solvent B. Suspension C. Colloid D. Solution 6. CaHs is a(n) A. nonpolar covalent molecule B. polar covalent molecule C. ionic compound D. nonpolar ionic molecule 17. Atoms of oxygen have a total of 8 electrons. Are these atoms stable, and why or why not? A. No, because the atoms have only 6 valence electrons, but need 8 for stability B. Yes, because the Octet Rule says stable atoms have 8 electrons C. Yes, because oxygen is in the air we breathe and it doesn't hurt us. D. No, because only atoms with 2 valence electrons are stable. 18. Carbon atoms have four valence electrons. Are they likely to react with other atoms, and why or why not? A. Yes, because they can become more stable by doing so. B. Yes, but only with other stable atoms C. No, because they do not have enough valence electrons. D. No, because they have an even number of valence electrons so they are already stable 19. Which of the following is not produced through chemical bonding? A. cells

Explanation / Answer

13, 14. Option D is correct. This is an example of non polar covalent bond because here both atom is hydrogen and thus, there is no electronegativity difference. Polar covalent bond occurs only when electronegativity difference occurs between bonded atoms.

15. Option B is correct. Blood is suspension as it contains solid particles (blood cells and proteins) in the suspended form.

16. Option A is correct. C2H6 is a nonpolar covalent molecule. Although, there is electronegativity difference between carbon and hydrogen atom, bu this difference is very less and thus the molecule is considered as non polar covalent molecule.

17. Option A is correct. An atom is only stable either in duet or octate condition. It means the number of electrons in the outermost shell of oxygen should be 8.

18. Option A is correct. Carbon can become more stable upon bonding with other atoms in order to maintain its octate.

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