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Chapter 2 Part II. Converting Between Units Density Temperature. Rounding Off. If the first digit to be removed is: 5 or greater then the preceding digit is increased by 1 (round up) Less than 5 then the preceding digit remains the same (round down). Rounding Off. Round 1345.493 to:

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chapter 2 part ii

Chapter 2Part II

Converting Between Units

Density

Temperature

rounding off
Rounding Off
  • If the first digit to be removed is:
    • 5 or greater then the preceding digit is increased by 1 (round up)
    • Less than 5 then the preceding digit remains the same (round down)
rounding off3
Rounding Off
  • Round 1345.493 to:
    • 2 decimal places
    • 1 decimal place
    • The 1’s (ones)
    • The 10’s (tens)
    • The 100’s (hundreds)
converting between units
Converting Between Units
  • Metric to Metric Conversions
    • See board
converting between units5
Converting Between Units
  • Miles  km
  • Pounds  grams  kg
  • mL  fluid ounces
  • M  cm  inches
density
Density
  • Density = mass of an object

volume of object

density7
Density
  • Units
    • The mass of the object is expressed in grams
    • The volume is expressed in:
      • mL or cm3 for solids and liquids
      • L for gases
  • Density units:
    • g/mL or g/cm3
    • g/L
    • Pounds/foot3 (English system)
density8
Density
  • Density of water is ~ 1g/mL at room temperature.
    • What is the approximate mass of water in a 0.5 L water bottle?
    • What is the volume of 150 grams of water?
density9
Density
  • Objects with a density greater than 1g/mL sink in water.
  • Objects with a density less than 1g/mL float in water.
density10
Density
  • The density of the elements can be found on the periodic table.
    • Examples:
  • The density of compounds must be looked up in reference “books”.
density11
Density
  • Calculating density from data
    • In class experiment
density12
Density
  • Rearrange the density equation to solve for volume and mass:

Volume =

Mass =

density calculations
Density Calculations
  • Calculate the mass, in grams and in pounds, of a gold brick
    • see board for the dimensions of the gold brick
density calculations14
Density Calculations
  • Calculate the volume, in ml, of my gold cross
    • Mass of cross: 4.5 g
      • Round your answer to 2 decimal places
temperature
Temperature

Temperature Scales (3)

  • Fahrenheit
  • Celsius
  • Kelvin
temperature conversions18
Temperature Conversions
  • Shark fishing example
  • Convert room temperature to:
    • 0 C and K
  • Sauna example