Chapter 2 Part II

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# Chapter 2 Part II - PowerPoint PPT Presentation

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 2Part 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:
• 2 decimal places
• 1 decimal place
• The 1’s (ones)
• The 10’s (tens)
• The 100’s (hundreds)
Converting Between Units
• Metric to Metric Conversions
• See board
Converting Between Units
• Miles  km
• Pounds  grams  kg
• mL  fluid ounces
• M  cm  inches
Density
• Density = mass of an object

volume of object

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)
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?
Density
• Objects with a density greater than 1g/mL sink in water.
• Objects with a density less than 1g/mL float in water.
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”.
Density
• Calculating density from data
• In class experiment
Density
• Rearrange the density equation to solve for volume and mass:

Volume =

Mass =

Density Calculations
• Calculate the mass, in grams and in pounds, of a gold brick
• see board for the dimensions of the gold brick
Density Calculations
• Calculate the volume, in ml, of my gold cross
• Mass of cross: 4.5 g