Warm Up: Density of Ice A block of ice 2 cm on each side has a mass of 7.472 g. What is the density of the ice? (Hint, don’t forget to find the volume of the ice first!)

Warm Up: Density of Ice Does the density of ice you calculated make sense? Why or why not?

Warm Up: Density of Ice Draw a dot diagram to compare the density of ice and water.

Density of Ice Does a bigger ice cube have more, less, or the same density as a smaller ice cube?

Class Data How does the volume of a material affect its density? Different Same N/A

Class Data How does the volume of a material affect its density? Different Same N/A 10 7 5

Class Data How does the volume of a material affect its density? Different Same N/A 10 7 5 13 3

Density of Chocolate Lab!

Density of Chocolate Lab! Question: What happens to density as you decrease an object’s size?

Review: Measurement and Units When we measure mass we use a _______________. The units for mass are _________. When we measure volume of a square or rectangular object we use a _______________. When we measure the volume of an irregularly shaped object like a stone we use ____________. The units for volume are _________. We calculate density by using the equation _______.

Exit Ticket What happens to a material’s density if you compare different volumes of the same material? How did today’s lab affect your thinking about Question 1? How confident do you feel in describing density? How can we help you become more confident?

Warm Up: Lead vs. Mercury Lead: Metal, solid at room temperature Density: 11.34 g/cm3 Mercury: Metal, liquid at room temperature Density: 13.53 g/cm3

Warm Up: Lead vs. Mercury Record your observations How can understanding density help us explain why some objects float while others sink? “Horrifyingly Dangerous Experiment” Video Link

What is the density of CO gas if 0.196 g occupies a volume of 100 cm3? Density Warm Up What is the density of CO gas if 0.196 g occupies a volume of 100 cm3?