22-23 Unit 11 lesson 4

Wednesday- Unit 11 -Half life& auiz on nuclear decay

Announcements/Reminders

Agenda:

​

• Unit 11 quiz today

• Edpuzzle on nuclear decay due Sunday 4/23

• Wed 4/26 Unit 11 test​

• Looking ahead (tentative dates):

  • Monday 5/8- Unit 12 test

  • Thursday 5/11 Benchmark 4

• Fri 5/12- PLD

• Final exam- 5/24 &5/25

  • There is NO quarter 4 recovery

  • Final exam is 20% of overall course grade

• half life

• quiz

• more half life practice

Bellwork: on GC​​

Multiple Choice

True or false: Radioactive decay is a chemical reaction

• True

• False

Multiple Choice

Which if the following elements has no stable isotopes?

• Pb

• U

• C

• O

page 12 in packet https://drive.google.com/file/d/1PVcZLc2_FtWco-P4c2AYAvsdlla45Lxt/view?usp=share_link

Multiple Choice

The half-life of Zn-71 is 2.4 minutes. If one had 100.0 g at the beginning, how many grams would be left after 7.2 minutes has elapsed?

• 100.0g

• 50.0g

• 12.5g

• 8.5g

Multiple Choice

If 1,000 g of iodine-131 is given to a patient, how much is left after 24 days? The half-life of iodine-131 is 8 days.

• 125g

• 1,500g

• 1.25g

• 25g

• 50g

Multiple Choice

If the half-life of uranium-232 is 70 years, how many years will it take for 10 g of it to be reduced to 1.25 g?

• 350 years

• 232 years

• 210 years

• 140 years

• 17 years

Multiple Choice

After the third half-life, how much of the sample is left?

• 1/2

• 1/3

• 1/16

• 1/8

Multiple Choice

The half life of iodine-131 is 8 days. What fraction of an iodine-131 sample will remain after 40 days?

• 1/2

• 1/64

• 1/5

• 1/32

Quiz on GC- in quizziz

After quiz, work on packet pages 10-17