Sign HONOR CODE on reverse when finished. SHOW ALL WORK for any calculations. Al

Question

Sign HONOR CODE on reverse when finished. SHOW ALL WORK for any calculations. All numbers and units must be clearly shown in your calculations in an orderly manner. All numerical answers must contain the correct number of significant figures. dearly indicate a numerical answer by circling it. Any answer that is not dor will be marked wrong. A. Hydrogen bonding B. Heat of solution C. Specific heat D. E = hv E. Phase diagram F. Polarity of molecule G. VSEPR and molecular shape H. Oxidation - reduction reaction I. PV = nRT J. Ion dissociation/electrolytes Select the predominant concept or word that apply to the following situations. Answer five of eight situations: Formation of frost heaves and pot holes in pavement/Ice floats Climate is more moderate closer to oceans than inland Not operating electrical equipment with wet hands Breathalyzer test, color of patina on Dallas Hall Cooking action in a microwave Helium balloon's rise in the atmosphere/ Aerosol canisters should not be exposed to direct sun light Sunblock protects from UV radiation damage/Color of fireworks A figure skater can skate on ice but not on glass

Explanation / Answer

2. Climate is moderate at oceans than inlands, this is due to Specific Heat.
Water has a higher heat capacity than soil and rock, so the ocean takes much longer to heat and to cool than the land. Coastal areas will generally have more moderate temperatures than inland areas because of the heat capacity of the ocean.

When the land heats up, the air above it heats up as well. On the other hand, the ocean heats up and cools down relatively slowly. Therefore, areas near the ocean generally stay cooler during the day and have a more moderate temperature range than inland areas. Now due to the phenomenon of convection this chilling effect get propagated through nearby area. The farther a region is from the ocean, the more extreme its climate is likely to be.

3. Dont touches electricals with wet hand as polarity of molecules change. Our body becomes good conductor of electricity and receives shock.

4. Breathanalyzer is a redox reaction based device
2 Cr2O7 2- + 3 C2H5OH + 16 H+ 4 Cr3+ + 3 C2H3O2H + 11 H2O

5 Microwave rays helps in cooking in the microwave. E=hv
Microwave oven cooks food because the water molecules inside it absorb the microwave radiation and thereby heat up and heat the surrounding food. Microwave radiation will similarly heat up skin and other body parts.

6. As per PV=NRT

A helium-filled balloon rises in the atmosphere because the weight of the helium gas is less than the weight of the air it has displaced from the volume of the balloon

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