1. Density and Specific Gravity Chapter 3 Notes II

2. Which weighs more, a pound of bricks or a pound of feathers?

3. Density When something feels heavy, you are noting its density. Density—the mass of an object per unit volume

4. Density D = m V

5. Density The unit for density should always be some unit for mass over some unit for volume. Usually it is g/mL, g/L or kg/m 3

6. Density Don’t forget: 1mL is the same as 1cm 3 !

7. Practice Problem #1 What is the density of an object that has a mass of 22.5g and a volume of 30.4 mL?

8. Practice Problem #2 If a cube has sides that are 8.2cm each and a total mass of 46.1g, what is its density?

9. Practice Problem #3 What is the volume of isopropyl alcohol if its mass is 45.22g and it has a density of 0.899 g/mL?

10. Specific Gravity Specific gravity is the density of an object in relationship to the density of a standard. Usually the standard is water, but not always.

11. Specific Gravity Sp. Gr. = Density substance Density standard Because it is density divided by another density, there is no unit for specific gravity.

12. Temperature Conversions K = °C + 273 °C = K – 273 Be able to convert temperatures between Kelvin and Celsius

13. Experimental Error % Error = Exp – Act X 100 Act