Bio260 Lab 1

Name:

Chemistry Worksheet

1. Atomic number equals the number of protons or electrons

Atomic mass equals the number of protons + neutrons

Using the periodic table, fill in the chart for each Atom (Round the atomic mass to the nearest whole number).

2. Carbon (C)

Atomic # = 6 Atomic Mass = 12

# of Protons = 6 # of Neutrons = 6 # of Electrons = 6

# of Electrons in the valence shell? 4

3. Oxygen (O)

Atomic # = 8 Atomic Mass = 16

# of Protons = 8 # of Neutrons = 8 # of Electrons = 8

# of Electrons in the valence shell? 6

4. Sodium (Na)

Atomic # = 11 Atomic Mass = 23

# of Protons = 11 # of Neutrons = 12 # of Electrons = 11

5. Chlorine (Cl)

Atomic # = 17 Atomic Mass = 35

# of Protons = 17 # of Neutrons = 18 # of Electrons = 17

# of Electrons in the valence shell? 7

6. Hydrogen (H)

Atomic # = 1 Atomic Mass = 1

# of Protons = 1 # of Neutrons = 0 # of Electrons = 1

# of Electrons in the valence shell? 1

7. Nitrogen (N)

Atomic # = 7 Atomic Mass = 14

# of Protons = 7 # of Neutrons = 7 # of Electrons = 7

# of Electrons in the valence shell? 5

8. Identify the following as synthesis, decomposition or exchange reaction

a. 2HG + O2 = 2HgO decomposition

b. Fe2+ + CuSO4 = FeSO4 + Cu2+ exchange

c. HNO3= H++ NO3- synthesis

9. Explain the basis of Ionic bonding. Give an example.

Ionic compounds form when elements share electrons and an ionic bond occurs when an electron is "stolen" from one atom by another. An example is sodium and chlorine combining to form table salt.

10. Explain the basis of Covalent bonding. Give an Example

A covalent bond is a chemical link between two atoms and electrons are shared between them. An example is the bond between oxygen and hydrogen in a water molecule.