Applied Chemistry Final Exam

How does the whooper swan depend on the chemistry of water?

Water is the molecule that supports all of life. Here are the reasons except ...

• All organisms live in an environment dominated by water

• Life on Earth began in water and evolved there for 3 billion years before spreading onto land

• Biological medium on Earth, and possibly on other planets as well

• Three-quarters of Earth’s surface is covered by water

• The only common substance to exist in the natural environment in all three physical states of matter

These are four emergent properties of water that contribute to Earth’s suitability as an environment for life

• cohesive behavior

• in its liquid form, its hydrogen bonds are very fragile

• ability to moderate temperature

• expansion upon freezing

• versatility as a solvent

Explain about the example of adhesion in plants

Explain about the example of cohesion in plants

Explain why do soil always in dynamic state

which one is slower, aerobic process or anaerobic process

• aerobic

• anaerobic

Stage 1 of decomposition of organic material is

• solids break down slowly and gas evolution decreases significantly

• organic acids are converted to methane, some metals may be methylated and converted to gases

  pH rises to 7

• relatively low molecular weight organic acids are produced (acetic, lactic, propionic, and

  butyric)

  decreasing pH to 4

Stage 2 of decomposition of organic material is

• solids break down slowly and gas evolution decreases significantly

• organic acids are converted to methane, some metals may be methylated and converted to gases

  pH rises to 7

• relatively low molecular weight organic acids are produced (acetic, lactic, propionic, and

  butyric)

  decreasing pH to 4

Stage 3 of decomposition of organic material is

• solids break down slowly and gas evolution decreases significantly

• organic acids are converted to methane, some metals may be methylated and converted to gases

  pH rises to 7

• relatively low molecular weight organic acids are produced (acetic, lactic, propionic, and

  butyric)

  decreasing pH to 4