Answer Happy

1. Describe the hazards represented by the symbols below and the precautions associated with them. b. a. 4. Which of the following types of fires should be extinguished using water? a. Class A, a fire that involves ordinary flammable materials b. Class B, a fire that involves flammable liquids, such as alcohol c. Class C, a fire that involves electrical equipment d. Class D, a fire that involves burning metal e. all of the above 2. An investigation requires the use of a Bunsen burner. Describe the safety precautions that should be taken when using this equipment. 3. Describe the safety practices you should follow when conducting Internet research on a particular topic.
5. Copy and complete the table below. Isotope Data Name of Isotope Notation for Isotope Atomic Number Mass Number Number of Protons Number of Electrons Number of Neutrons 3581 2210 calcium-44 4760
6. Define the term valence electron and explain the role these electrons play in chemical bonds. 7. In the Bohr-Rutherford model of the atom, Bohr showed that electrons can exist only in specific energy levels. The maximum number of electrons that can occupy an energy level can be determined by the formula a. n2 d. N= A - Z b. 2n2 e. none of the above C. A = N-Z 8. Which of the following represents the correct Lewis diagram of sulfur? si •S: a. c. b. 5 d. :S: e. none of the above