1. Which is more dense, water or wood? How do you know? 2. Which is more dense, 1 pound of lead or 100 pounds of lead? Wood, if it sinks in water. SAME!

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1. Which is more dense, water or wood? How do you know? 2. Which is more dense, 1 pound of lead or 100 pounds of lead? Wood, if it sinks in water. SAME! because… Water, if the wood floats. WARM UP (for NOTES)

Density : ratio of mass to volume mVmV d =

Density depends only on the substance, not the size of the sample. 1 piece Aluminum d = 2.70 g/cm 3 2 equal pieces Aluminum d = ??? g/cm 3 d = 2.70 g/cm 3

d = 42.7 g 4.8 cm 3 d = 8.9 g/cm 3 Calculating Density A copper block has a mass of 42.7 g. What is the density of copper? m V d = L = 2.3 cm H = 1.9 cm W = 1.1 cm V = L x W x H V = (2.3)(1.1)(1.9) V = 4.8 cm 3

1.58 = m. 100 m = 158 g Calculating with Density A cup of llama snot has a volume of 100 mL, and a density of 1.58 g/mL. What is the mass of the llama snot? m V d = (1.58)(100) = m

17.5 = 425 V V = 24.3 mL Calculating with Density What is the volume of 425 g of a solution with a density of 17.5 g/cm 3 ? m V d = V =