Last Updated 27 Jan 2021

Bioportal Study Guide

Category Chemistry, Nature, Physics
Essay type Research
Words 1045 (4 pages)
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1. Polar molecules

  • A. have bonds with an unequal distribution of electric charge.
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  • B. must form ions in water solution.
  • C. have bonds with an equal distribution of electrical charge.
  • D. have bonds with an overall negative charge.
  • E. have bonds with an overall positive charge. Correct See Section

2. How Do Atoms Bond to Form Molecules? Points Earned.

Correct Answer:

Your Response: A.

2. Hydrocarbons are _______ and _______, whereas salts are _______ and _______.

  • A. nonpolar; hydrophobic; polar; hydrophilic
  • B. nonpolar; hydrophilic; polar; hydrophobic
  • C. polar; hydrophilic; nonpolar; hydrophobic
  • D. polar; hydrophobic; nonpolar; hydrophilic
  • E. None of the above Correct See Section

3. The pH of coffee is close to 5 and that of pure water is 7. This means that:

  • A. coffee is more basic than water.
  • B. water is more acidic than coffee.
  • C. the H+ concentration of coffee is seven-fifths that of water.
  • D. the H+ concentration of water is one-one hundredth that of coffee.
  • E. the H+ concentration of water is one-hundred times that of coffee. Correct See Section

3.1 What Makes Water So Important for Life?

Correct Answer:D 

4. Which of the following statements best describes the difference between an element and a molecule?

  • A. An element is composed of atoms; a molecule is not.
  • B. An element is composed of only one kind of atom; molecules can be composed of more than one kind of atom.
  • C. An element is unstable; molecules are stable.
  • D. Elements always have lower atomic weights than molecules.
  • E. Elements exist in nature only as parts of molecules.

Correct Answer: B

Your Response: B

5. Solid salt, NaCl, is neutral. When dissolved in water, NaCl

  • A. remains as NaCl (does not dissociate).
  • B. dissociates to form Na– and Cl+.
  • C. dissociates to form Na+ and Cl– ions that do not interact with water molecules.
  • D. dissociates to form Na+ and Cl– ions that interact with water molecules.
  • E. does not dissociate but interacts with water molecules.

Correct Answer:D

Your Response:D

6. Why is the pH of a 0. 1 M solution of acetic acid in water higher than that of a 0. 1 M solution of HCl in the water?

  • A. HCl is a weaker acid than acetic acid.
  • B. The acetic acid does not fully ionize in water, but HCl does.
  • C. HCl does not fully ionize in water, but acetic acid does.
  • D. Acetic acid is a better buffer than HCl.
  • E. Acetate (ionized acetic acid) is a strong base.

 Correct Answer:B

Your Response: B

7. The reactivity of an atom arises from the

  • A. energy difference between the s and p orbitals.
  • B. potential energy of the outermost shell.
  • C. average distance of the outermost shell from the nucleus.
  • D. um of the potential energies of all-electron shells.
  • E. existence of unpaired electrons in the outermost shell.

Correct Answer:E

Your Response: E

8. The covalent bond formation depends on the ability of atoms to

  • A. share electrons with other atoms.
  • B. donate electrons to other atoms.
  • C. receives electrons from other atoms.
  • D. Both a and b
  • E. All of the above

Correct Answer:A

Your Response: A

9. Which of the following structures molecules is incorrect?

  • A. CH3—NH3
  • B. CH2=CH2
  • C. CH3—NH2
  • D. CH3—NH3+ E. CH3—CH3

Correct Answer:A

Your Response: A

10. What property of water contributes most to the ability of fish in lakes to survive very cold winters?

  • A. Water is cohesive.
  • B. Water has a high heat capacity.
  • C. Frozen water is denser than liquid water.
  • D. Frozen water is less dense than liquid water.
  • E. Water forms hydrogen bonds.

Correct Answer:D

Your Response:D

11. Water is essential to life. Which of the following physical properties of water effect (s) life in some beneficial way?

  • A. Cohesiveness
  • B. High heat capacity
  • C. The high heat of vaporization
  • D. Ice is less dense than liquid water
  • E. All of the above Correct See Section
  •  Answer: E
  • Response: E

12. Which of the following interactions between atoms is the strongest?

  • A. Hydrophobic
  • B. Ionic
  • C. Covalent
  • D. van der Waals
  • E. Hydrogen bonds Correct See Section

Correct Answer:C

Your Response:C

13. Given that Avagadro's number is 6. 02? 1023, how many molecules of KCl would there be in 10–13 liter of a 1 M KCl solution?

  • A. 6. 02? 1036
  • B. 6.02? 1010
  • C. 6.02? 10–10
  • D. 6.02? 103
  • E. 6.02? 1013


Your Response: B

14. For a covalent bond to be polar, the two atoms that form the bond must have

  • A. differing atomic weights.
  • B. differing numbers of neutrons.
  • C. differing melting points.
  • D. differing electronegativities.
  • E. similar electronegativities.


Your Response:D

15. Which of the following statements about chemical reactions is false?

  • A. They occur when atoms combine or change their bonding partners.
  • B. Energy may be created or destroyed in a chemical reaction.
  • C. Reactions may go to completion.
  • D. Changes in forms of energy may accompany chemical reactions.
  • E. The products of a chemical reaction are formed from the reactants. Correct See Section

 Correct Answer: B

Your Response: B

16. Propane (CH3—CH2—CH3), is considered a nonpolar molecule because

  • A. it does not contain oxygen.
  • B. carbon and hydrogen have similar electronegativities.
  • C. it is a gas.
  • D. it is flammable.
  • E. it forms hydrogen bonds.


Your Response: B

17. Isotopes of an element

  • A. is always unstable and radioactive.
  • B. have different numbers of protons.
  • C. have the same atomic weight.
  • D. have different numbers of neutrons.
  • E. have different numbers of electrons.

Correct Answer:D

Your Response:D

18. An element that contains ten protons and ten electrons are likely to

  • A. form covalent bonds with another element.
  • B. form ionic bonds with another element.
  • C. be chemically inert (stable).
  • D. be radioactive.
  • E. be toxic.


Your Response:C

19. Rank the elements carbon (C), hydrogen (H), oxygen (O), and phosphorus (P) in decreasing order of the number of covalent bonds they usually form.

A. C ; P; N; O; H B. P; O; C; N; H C. P; C; N; O; H D. P; C; O; N; H E. P; C; O; H; N

Correct Answer: C

Your Response: C

20. The molecular weight of acetic acid is 60. How many grams of acetic acid would be required to prepare 10 ml of a 0. 001 M (1. 0 mM) solution?

  • A. 6. 0
  • B. 0. 6
  • C. 0. 0006
  • D. 0. 06 E. 0. 006 Correct See Section

Correct Answer:C

Your Response:C

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