Density Densityin words and pictures how closely packed

Density

Density…in words and pictures �how closely packed together the molecules or atoms are in an object. Which is more dense? Which sample has the closest packed particles?

Density…by the numbers �Numbers make it easier to compare different densities. �Counting particles would be really hard to do for every sample…so we have an equation to solve that problem. �Density = Mass/Volume • D = M/V

Density…can you calculate it? �What is the density of the sample? �Tools: • D= M/V • has a mass of 1 gram • One green box has a volume of 1 liter

Density…can you calculate it? �What is the Density of the sample? �Tools: • D= M/V • has a mass of 1 gram • One green box has a volume of 1 liter

Density…does the size of the sample change it? �Cut the sample in half. What is the new density?

Density…does the size of the sample change it? �Why didn’t the density change when we cut the sample in half? �What numbers changed? What numbers stayed the same?

Density…practice calculations � What is the density of a 2 milliliter (volume) sample of oil with a mass of 1 gram? � What is the volume of a sample of aluminum with a mass of 5 grams and a density of 3. 52 g/L? � Water has a density of 1 gram/milliliter. What is the mass of a 10 milliliter sample?

Density…how does this relate to it floating or sinking? �The Rule… • If the object has a density GREATER than the liquid it is put in it SINKS • If the object has a density SMALLER than the liquid it is put in it FLOATS �Back to the Demo…was the density of the candle greater or smaller than the liquid?

Density…I tricked you!! �Did the density of the candle change in each beaker? �Is the candle more or less dense than the liquids?

Density Column �What is it? What does it show?