Overview of Chemical Bonds and Reactions Chapter Exam

Exam Instructions:

Choose your answers to the questions and click 'Next' to see the next set of questions. You can skip questions if you would like and come back to them later with the yellow "Go To First Skipped Question" button. When you have completed the practice exam, a green submit button will appear. Click it to see your results. Good luck!

Page 1

Question 1 1. A _____ pKa indicates a _____ acid.

Question 2 2.

Which of the following statements are true?

I. Noble gases complete their valence level by sharing electrons.

II. Covalent bonds are weak and easily broken.

III. Covalent bonds allow us to make predictions on how the molecule will look.

Question 3 3.

If a carbon atom has four valence electrons, which of the following statements are true?

I. Carbon can form a triple covalent bond with another carbon atom.

II. A carbon atom cannot form two double bonds simultaneously.

III. A carbon atom can form four single covalent bonds simultaneously.

Question 4 4. Which best describes an anion?

Question 5 5.

Which of the following statements are true?

I. Water molecules can form hydrogen bonds with sodium chloride.

II. Water molecules can form an ionic bond with other water molecules.

III. The hydrogen of a water molecule can form a hydrogen bond with the hydrogen of another water molecule.

Page 2

Question 6 6. Which of the following helps blood to be a good buffer?

Question 7 7. In a dehydration reaction, _____ are linked together to form _____.

Question 8 8. Which of the following indicates a strong acid?

Question 9 9. Which of the following concepts best describes a chlorophyll molecule absorbing light and changing it into chemical energy?

Question 10 10. When energy is unavailable to be used it is called _____.

Page 3

Question 11 11. If a silicon atom has four valence electrons, what is the maximum number of bonds it can form?

Question 12 12. Chemical reactions are _____.

Question 13 13. Which of the following reactions produces large molecules, such as carbohydrates and proteins, and uses these new molecules to build muscle tissue, create new cells and mineralize bone?

Question 14 14. Why would you not have two sodium (Na) atoms in a compound with only one chlorine (Cl) atom?

Question 15 15. Which best describes a cation?

Page 4

Question 16 16. When both the reactants and the products of a reaction exist simultaneously because both forward and reverse reactions are competing, you have a _____.

Question 17 17. Which is NOT one of the four main classes of biomolecules?

Question 18 18. Which of the following statements is true about metabolism?

Question 19 19. What type of bond forms when atoms have highly different electronegativities?

Question 20 20.

Which of the following statements is true?

I. In an ionic bond, electrons move toward the atom that is more electronegative.

II. A cation is a negatively charged atom.

III. A positively charged atom is called an anion.

IV. Under biological conditions, ionic bonds are stronger than covalent bonds.

Page 5

Question 21 21.

What products would you expect from a reaction between HCl and KOH?

I. KCl

II. H2O

III. KH

Question 22 22.

The second law of thermodynamics states that:

I. Energy can neither be created nor destroyed

II. All free energy cannot be converted into usable energy

III. The entropy of a system increases over time

Question 23 23. The fact that energy can be neither created nor destroyed is _____.

Question 24 24. If dissolving carbon dioxide in water to form carbonic acid is the forward reaction, what is the reverse reaction that balances this reaction in chemical equilibrium?

Question 25 25. When something is moving it has _____ energy.

Page 6

Question 26 26. In the following chemical equation, what is the reducing agent?

Question 27 27.

What differentiates a nonpolar covalent bond from a polar covalent bond?

I. Unequal sharing of electrons

II. Ions

III. Atoms of partial charge

Question 28 28. How does an atom try to fill its valence shell?

Question 29 29. The reason our blood can maintain a relatively neutral pH and keep us from getting sick is _____?

Question 30 30. Intramolecular Bonds:

Overview of Chemical Bonds and Reactions Chapter Exam Instructions

Choose your answers to the questions and click 'Next' to see the next set of questions. You can skip questions if you would like and come back to them later with the yellow "Go To First Skipped Question" button. When you have completed the practice exam, a green submit button will appear. Click it to see your results. Good luck!

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