Chemistry Honors – Class 41

Sodium Chloride

Dates

• Period A – Thursday, November 21st
• Periods C, D – Friday, November 22nd

Video 1 – “A Matter of State” (see video series [LINK])

• Questions
  • The video states that states of matter may be changed. What is needed to make this possible
  • What is the relationship between the temperature and pressure of a gas?
  • Describe, at the molecular level, how temperature affects the pressure of a gas.
  • How does the collapsing can demo work. Draw diagrams of before, during, and after the heating.
  • How is liquefied natural gas produced?
  • What are some uses of liquid nitrogen?
  • Why does the process of perspiration cool a person?
  • Describe the element bromine in its three states.
  • What happens to the particles in bromine as it is cooled?
  • What does the shape of a crystal tell us about its internal structure?

Video 2 – “Water” (see video series [LINK])

• Questions
  • What is the annual rate of consumption of water per person? What percent of this is for agricultural purposes?
  • What are the main uses of water in industry?
  • How does the mass of a water molecule compare to common gases like nitrogen, oxygen, and carbon dioxide?
  • What is meant by a polar molecule?
  • What is hydrogen bonding?
  • What are some properties of water that are due to hydrogen bonding?
  • What is unusual about the density of ice compared to the density of water?
  • Briefly describe the dissolving process.
  • What generalization may be made about whether or not one material will dissolve in another?
  • Why is there controversy about the amount of various chemicals that may be found in a sample of water?

Homework

• Make sure you have answered the questions and submitted to Dropbox
• Note – neatness matters 🙂