Biology 1406 Chapter 2 Worksheet - exam 1 chapter 2. By Sydney Oberheiden of Dallas TX. https://www.pinterest.com/nycsydney/ and http://sydneyoberheiden.blogspot.com/

1. BIOL 1406, Spring 2020
EXAM 1: CHAPTER 2 (CHEMISTRY) REVIEW QUESTIONS
*If you can answer these questions, you are definitely ready for Ch 2’s part of Exam 1!
1. What does atomic number tell you?
2. What does atomic mass tell you?
3. Can the atomic mass for particular element change?
4. Can a particular element’s atomic number change?
5. You have two atoms. Atom A has an atomic number of 7 and an atomic mass of 14. Atom B has a an
atomic number of 7 and a mass of 16. What can we say these atoms are?
6. Isotopes of a particular element have a different number of _____________.
7. What’s the atomic number of an ion with 8 protons, 8 neutrons, and a charge of 2+?
8. The mass of Cl-37 is greater than the mass of Cl-35 because Cl-37 has a greater number of ____________.
9. Why can we call H20 a compound but not call O2 a compound?
10. What’s going on with the electrons involved in a covalent bond?
11. In what type of covalent bonding are electrons between two atoms shared equally?
12. In what type of covalent bonding are electrons between two atoms shared unequally?
13. What causes polar covalent bonding?
14. In a polar covalent bond, what kind of charge will the more electronegative atom end up having?
15. To form a water molecule, oxygen and hydrogen atoms share electrons. Oxygen is more electronegative
than Hydrogen. What kind of bond is this holding together atoms within a water molecule?
16. What kind of bonds attach water molecules to other water molecules?
17. What’s going on with the electrons involved in an ionic bond?
18. Typically, an atom has a net charge of zero because they have an equal number of protons and electrons to
balance out their charge. If an atom gains an electron, through bonding, will that ion become negatively
or positively charged?
19. The electron transfer in ionic bonding results in both atoms having a charge. What’s the name of a
positively charged ion? What about a negatively charged ion?

2. 20. How many electrons are being shared in a single covalent bond? What about in a double covalent bond?
21. What do atoms achieve by filling their valance shells?
22. When drawing electron orbitals (shell models), what’s the electron capacity for the first shell? (How many
dots will you put in the first circle?)
23. When drawing electron orbitals (shell models), what’s the electron capacity for the second and all
following shells?
24. Does an anion or cation have a charge of -1?
25. If an atom has a total of 9 electrons, is this atom more likely to become anion or cation with ionic bonding?
26. What’s it called when forward reactions and reverse reactions are going at the same rate?