Chem2

  • 216 views
Uploaded on

 

More in: Technology , Business
  • Full Name Full Name Comment goes here.
    Are you sure you want to
    Your message goes here
    Be the first to comment
    Be the first to like this
No Downloads

Views

Total Views
216
On Slideshare
0
From Embeds
0
Number of Embeds
0

Actions

Shares
Downloads
0
Comments
0
Likes
0

Embeds 0

No embeds

Report content

Flagged as inappropriate Flag as inappropriate
Flag as inappropriate

Select your reason for flagging this presentation as inappropriate.

Cancel
    No notes for slide

Transcript

  • 1. Ratios and dimensional analysis
  • 2. Do now
    1. A classroom is 7.0 m wide, 10 m long, and holds 25 people. What is the population density of the classroom?
    2. Scientifically notate: 84.029 ; 0.000541 ; and 623.000
  • 3. Ratios
    speed = distance/time
    density = mass/volume.
    d = m/v
    (mnemonic: DMV)
  • 4. Ratios
    e.g. If a metal block has a mass of 75 grams and a volume of 22 cubic centimeters, what is its density?
    75 g/22 cm3= 3.4 g/cm3
  • 5. Density of some common substances
  • 6. Ratios
  • 7. Ratios
    The density of air is .0013 g/cm3.
    Find the mass of 200 cm3 of air.
    d=m/v
    m/v = d
    m=dv
    m= .0013 g/cm3 x 200 cm3
  • 8. Ratios
    Tonya goes swimming. When she takes a deep breath and holds it, she is able to float on water. When she exhales, she sinks. Why?
  • 9. Q: How do you not sink in quicksand?
    (video)
  • 10. Dimensional analysis
    One of the most useful things! Ever!
    Q. How many seconds are there in 1 hour?
    1 hr x 60 min/1hr x 60 sec/1min = ?
  • 11. Dimensional analysis
    1 in = 3.54 cm
    1 ft = 12 in
    Q. How many feet are in 86 cm?
  • 12. Practice
    1 m = 100 cm; 1 cm = 10 mm
    1 in = 2.54 cm
    1. Convert 75 mm to inches.
    75 mm x 1 cm/10 mm x 1 in/2.54 cm =
  • 13. Quiz