Scientific Principles PPT 4 - Properties of Liquids

Which of the following systems commonly use refrigerants?

• Air conditioning

• Solar panels

• Wind turbines

• Hydroelectric dams

What property of refrigerants allows them to absorb heat and change from a liquid to a gas?

• Low boiling point

• High density

• High boiling point

• Low density

Refrigerants are generally classified as which of the following?

• Hydrofluorocarbons or Chlorofluorocarbons

• Hydrocarbons or Chlorocarbons

• Fluorocarbons or Hydrocarbons

• Chlorofluorocarbons or Hydrocarbons

Why are Chlorofluorocarbons being phased out?

• They are too expensive to produce

• They are harmful to the environment and ozone

• They are ineffective as refrigerants

• They are in short supply

Which type of refrigerant is considered less harmful in most applications?

• Chlorofluorocarbons

• Hydrofluorocarbons

• Hydrocarbons

• Chlorocarbons

Who is allowed to handle many refrigerant gases due to their environmental impact?

• Any trained technician

• Only licensed operatives

• Environmental scientists

• Chemical engineers

What is the primary purpose of anti-freeze solutions?

• To increase the boiling point of water

• To reduce the freezing point of water-based solutions

• To clean heating systems

• To enhance the taste of water

What is the primary use of refinery gas in oil refining?

• Used in chemical production

• Used as a fuel

• Used in aircraft

• Used for roofing materials

Why do fuel oils float on the surface of water?

• They are more dense than water

• They are less dense than water

• They are the same density as water

• They are mixed with water

What is viscosity?

• The ability of the oil or substance to flow

• The temperature at which the oil is viscose enough to be poured

• The temperature at which the oil starts to produce flammable vapors

• The density of the oil