1. Chemical bond due to sharing of electrons:

a. ionic bond
b. molecule bond
c. compound
d. covalent bond
e. hydrogen bond

2. Chemical bond due to electrostatic attraction between ions of opposite charge:

a. ionic bond
b. molecule bond
c. compound
d. covalent bond
e. hydrogen bond

3. Atomic number:

a. number of electrons in an atom
b. number of protons in an atom
c. number of neutrons in an atom
d. number of atoms in a molecule
e. number of elements in an atom

4. Number of electrons in the valence shell of an atom with atomic number 6:

a. 2
b. 4
c. 6
d. 8
e. a and d

5. Number of electrons in the valence shell of Neon and Argon:

a. 2
b. 4
c. 6
d. 8
e. a and d

6. Element symbol for oxygen:

a. o
b. O
c. O2
d. Ox
e. U

7. Element symbol for potassium:

a. K
b. Na
c. Fe
d. Mg
e. I

8. Element symbol for sodium:

a. K
b. Na
c. Fe
d. Mg
e. I

9. Water is important to life on Earth because

a. life evolved on land
b. many chemical reactions in living things require water
c. it can be used to mix drinks
d. it is necessary in swimming pools
e. a and b

10. A scale to measure acidity -- the concentration of free hydrogen ions in water solutions.

a. pH scale
b. buffer scale
c. weight scale
d. acidic scale
e. acid precipitation scale

11. Which of the following is considered a carbohydrate source?

a. Cooking oil
b. Rice
c. Eggs
d. Butter
e. Water

12. Long chain of amino acids held together with peptide bonds.

a. Nucleic acid
b. Carbohydrates
c. Proteins
d. Lipids
e. None of the above

13. Number of electrons in a filled valence shell:

a. 4
b. 6
c. 8
d. 10
e. 12

14. Bond formed by weak charged attractions when a hydrogen atom in a polar covalent bond is attracted to a neighboring electronegative atom:

a. ionic bond
b. molecule bond
c. compound
d. covalent bond
e. hydrogen bond

15. The most acidic substance:

a. vinegar
b. lemon juice
c. human saliva
d. blood
e. stomach acid