Science Semis

• Properties used to describe gas

  • Pressure
  • Temperature
  • Volume
• Container with smaller volume

  Higher pressure
• Container with greater volume

  Lower pressure
• Units for describing gas pressure


  • Atm
  • torr
  • N/m2
  • Pa
  • mmHg
  • psi
• Number of gas particles

  More gas particles, more pressure exerted
• property of gass

  • has mass
• Air can still be pumped inside a balloon even though it is already inflated since gas is compressible
• Boyle's Law


  The volume of a gas is inversely proportional to pressure
• Boyle's Law examples


  • Water pressure increases with depth. As a result, when one swims to greater depths, the lungs gets compressed
  • If the pressure is doubled, the volume will be reduced to half
  • Air bubbles increase in size as it approaches the surface due to lower water pressure
  • Deep sea fishes die when brought to the surface due to a decreased pressure. This results in the increased volume of gases in their bodies
  • The volume inside of a balloon will increase if brought to a high altitude since pressure there is lesser
  • When the pressure of a bicycle tire decreases, the volume of the tire increases (tire becomes flat or less inflated)
• Charles' Law


  The volume occupied by a fixed amount of gas is directly proportional to its absolute temperature, if the pressure remains constant
• Charles' Law examples


  • A balloon expands when subjected to heat
  • Hot air balloon
  • Pressure Cooker
  • The volume of the dough increases as its temperature increases
• Monomers


  Single basic building units of all organic compounds. They can be composed of more than one atom and exhibits patterns which are repeated
• Elements common in all biomolecules

  • Carbon
  • Hydrogen
  • Oxygen
• Carbohydrates


  Biomolecules which are the main source of energy because it can be easily broken down
• Carbohydrates


  • Glucose
• Carbohydrates


  Biomolecules which may cause weight gain
• Condensation Reaction


  The process of joining two monosaccharides to form a Disaccharide
• Polysaccharides


  • Starch
  • Glycogen
  • Cellulose
• Amino Acids


  Building blocks of the biomolecule, protein
• Amino acids


  We can get a steady supply from proteins rich diet
• Enzymes


  Proteins that act as biological catalysts. Enzymes speed up reactions in the body and eventually use up in the process
• Major sources of protein

  • Eggs
  • Fish
  • Milk
• Proteins


  Helps in building and repairing tissue
• Lipids


  The most abundant are the fats and oils
• Lipids


  • Oleic Acid
• Nucleic Acids


  DNA and RNA are two kinds