5.26 chem ll - wildsci-msr.weebly.com

CHEMISTRY

Almost there….

◦ May 31st – No School Memorial Day

◦ June 15th – Remove your temporary zero

◦ Science Check In Calls w Ms. R - No Appointments

Needed - just call me at 541-604-8522

◦ If you have a specific reason for needing it to be

scheduled – you can webmail me to ask for a time

◦ June 15th – Deadline for portfolio/lab and test reworks

for Ms R’s classes

◦ June 17th – Last Day to turn in lessons – 9pm PST cut off

– all other work will become a zero

Unit 5

Lots of vocab –Take notes and read quiz and test questions carefully!

Fission vs Fusion◦ process in which a heavy nucleus is

split into two large fragments of comparable mass to form more stable and smaller nuclei, resulting in the release of great amounts of energy

◦ process in which lighter atomic nuclei combine to form a more stable, heavier nucleus, resulting in the release of great amounts of energy

Fusion Fission

Nuclear Energy◦ How is current nuclear energy created: Fission or Fusion???

◦ Fission (rx =

◦ The sun/stars and power plants powered by Fission

How it works

Nuclear Radiation Exposure

Analyze…

◦ What radiation is blocked by the skin but the most dangerous if it is absorbed internally?

◦ alpha radiation – don’t eat or drink anything exposed to alpha particles!!

◦ When are you at risk of exposure to gamma radiation?

◦ When undergoing medical procedures – remember gamma rays produced by multiple types of radioactive decay and when working with charged particles

Nuclear Radiation Units◦ Common vs SI

◦ Emission measurement - describes amount of materials released into environment

◦ Absorbed Dose - describes the amount of energy deposited per unit mass of human tissue during exposure

◦ Dose Equivalent – measures the biological risk of exposure to radiation

rem = rad x Q ◦ Simply means the risk is much greater for humans when exposed to certain types of radiation

◦ Alpha particles, fission fragments, or heavy ions 20x more dangerous

◦ higher energy level particle = higher level of danger