Quiz 9/ g = 1 ___ L = 1 ___ m = 2.35 ___ Match the unit with the measurement a) g b) L c) g/cm g = 1 kg 1000g = 1 kg 100L = 1 HL 100L = 1 HL 23.5 m = 2.35 Dam 23.5 m = 2.35 Dam Match the unit with the measurement Match the unit with the measurement g = mass g = mass L = volume L = volume g/cm 3 = density g/cm 3 = density Density Volume Mass Number Write 3 physical properties of the items in the tubes a -> e

Metric Conversions the easy way! 1000 mg = _____ g 1000 mg = _____ g 1L = _____mL 1L = _____mL 160 cm = _____ mm 160 cm = _____ mm 14 km = ______m 14 km = ______m 109 g = _______ kg 109 g = _______ kg 250 m = _____km 250 m = _____km 56 cm O 6 m 56 cm O 6 m 7g O 698 mg 7g O 698 mg < < Practice: Notes, 1 – 21 are homework

Density: how much mass per unit volume? Volume is measured in three dimensional quantities: mL, L, cm 3, m 3,… Volume is measured in three dimensional quantities: mL, L, cm 3, m 3,… Mass is measured in g, kg,… Mass is measured in g, kg,… Density is a “derived unit” of g/ml or g/cm 3 or g/L or kg/L,…. Density is a “derived unit” of g/ml or g/cm 3 or g/L or kg/L,…. Density = Mass Volume Mass = Density x Volume Volume = Mass Density

Density = mass/volume What is the density of a piece of concrete that has a mass of 8.76g and a volume of 3.07 cm 3 What is the density of a piece of concrete that has a mass of 8.76g and a volume of 3.07 cm 3 Density = Mass Volume Mass = Density x Volume Volume = Mass Density mass = 8.76 g density = ? Volume = 3.07 cm 3 density = 8.76 g 3.07 cm 3 = 2.85 g/cm 3

Density = mass/volume Limestone has a density of 2.72 g/cm 3. What is the mass of 24.9 cm 3 of limestone? Limestone has a density of 2.72 g/cm 3. What is the mass of 24.9 cm 3 of limestone? Density = Mass Volume Mass = Density x Volume Volume = Mass Density mass = ? density = 2.72 g/cm 3 Volume = 24.9 cm 3 mass = (2.72 g/cm 3 )(24.9 cm 3 ) = 67.7 g

Density Practice for extra credit. 1. Illegal ivory is sometimes detected on the basis of density. What is the density of a sample of ivory whose volume is 14.5 cm 3 and whose mass is 26.8 g? 2. An archeologist finds that a piece of pottery has a mass of 0.61 g and a volume of 0.26 cm 3. What is the density of the pottery? 3. Calcium chloride is used as a de-icer on roads in winter. It has a density of 2.50 g/cm 3. What is the volume of 7.91 g of this substance?

Key Terms: Key Terms: 15 points, Turn in Today Mass (kg) Mass (kg) Weight (lbs) Weight (lbs) Volume (ml or L) Volume (ml or L) balance (g) balance (g) length (cm or m) length (cm or m) time (sec) time (sec) temperature ( o C or K) temperature ( o C or K) Accuracy Accuracy Precision Precision Percent error Percent error Significant Digits Significant Digits Derived units Derived units density (g/cm 3 ) or density (g/cm 3 ) or (g/ml) counting number counting number prefix prefix kilo deci milli micro Find the definition for each, write a sentence using the word correctly.