1. Chapter 2Part II Converting Between Units Density Temperature

2. 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)

3. Rounding Off • Round 1345.493 to: • 2 decimal places • 1 decimal place • The 1’s (ones) • The 10’s (tens) • The 100’s (hundreds)

4. Converting Between Units • Metric to Metric Conversions • See board

5. Converting Between Units • Miles  km • Pounds  grams  kg • mL  fluid ounces • M  cm  inches

6. Density • Density = mass of an object volume of object

7. 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)

8. 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?

9. Density • Objects with a density greater than 1g/mL sink in water. • Objects with a density less than 1g/mL float in water.

10. 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”.

11. Density • Calculating density from data • In class experiment

12. Density • Rearrange the density equation to solve for volume and mass: Volume = Mass =

13. Density Calculations • Calculate the mass, in grams and in pounds, of a gold brick • see board for the dimensions of the gold brick

14. Density Calculations • Calculate the volume, in ml, of my gold cross • Mass of cross: 4.5 g • Round your answer to 2 decimal places

15. Temperature Temperature Scales (3) • Fahrenheit • Celsius • Kelvin

16. Temperature

17. Temperature Conversions TK = TC = TF =

18. Temperature Conversions • Shark fishing example • Convert room temperature to: • 0 C and K • Sauna example