October 5, 2021

- Math: perimeter of irregular polygons. Please complete these questions as you will need the skills to do what I am going to teach you tomorrow

- Loonie for Terry - last day is Friday this week

 Science note:

October 5, 2021

- read page 28 about light bulbs.  See imaged below if you did not take a screen shots

Science notes today

- mixtures in the real world are helpful and dangerous

- examples: light bulbs

 

1)    Traditional light bulbs

- cheap ($0.50 each)

- hot after a few mins (waste electricity because electricity turns to heat and light)

- they don’t last very long (3 to 6 months)

 

 

 

 

 

 

 

 

 

 

 

2)    Compact Fluoresce light bulbs (CFL bulbs)

- brighter, last longer (3 to 5 years)

- more expensive

- contain mercury (very toxic), must be brought to a recycling depot

to dump

 

 

3)    LED lights

- last for up to 10 years

Very bright, use less electricity, wont heat up the bulb

- no mercury or other toxic chemicals

- expensive ($5 each) – but government rebates during Thanksgiving