Density Why some things sink and others float. Rainbow Lab.

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Presentation transcript:

Density Why some things sink and others float

Rainbow Lab

JarMass of Salt Volume of water Food coloring 11.7 g10 mLBlue 21.4 g10 mLGreen 31.1 g10 mLYellow 40.6 g10 mL2 Yellow, 1 Red 50 g10 mLRed

Rainbow Lab JarMass of Salt Volume of water Food coloring 15 g30 mLBlue 24.2 g30 mLGreen 33.2 g30 mLYellow 41.7 g30 mL2 Yellow, 1 Red 50 g30 mLRed

What if I finish early? Calculate the density of the cubes on lab station #8 using the equation: Density = Mass Volume

Rainbow Lab Analysis RedOrangeYellow GreenBlue

Density How much “stuff” is in a certain space.

MISCONCEPTION ALERT Density Weight

Which object weighs more? Which object is more dense? Density of water = 1.0 g/cm 3 Density of gold = 19.3 g/cm 3

Density How much matter (mass) is in a certain volume m V d

m V d Let’s see what happens when we change one variable Think about your knowledge of fractions from math class

If mass gets bigger… …and volume stays the same What happens to density? 20 kilograms 40 kilograms

If volume gets bigger… …and mass stays the same What happens to density? 20 kilograms

If mass gets bigger… …and density stays the same What happens to volume? 20 kilograms 40 kilograms

If density gets smaller… …and volume stays the same What happens to mass? 20 kilograms 10 kilograms

Sink or float?

Water has a density of 1.0 g/mL. Therefore, any object with a density of LESS than 1.0 g/mL will FLOAT in water. SINK Anything with a density of MORE than 1.0 g/mL will SINK.

Layers Why did the colors in rainbow lab work when we used the same materials for each color?