Density Lab

Warm - Up What is density? What is the formula for density? What are some different methods that we could use to find the density of anobject?

Objective Today I will be able to: Apply the formula for density to problem solving Calculate density by using different laboratory techniques

Homework Have a great weekend 

Agenda Warm – Up Density Notes Density Lab Density practice problems Exit Ticket

Density Notes

What is the formula for density?

Density = Mass Volume

What are the units for density?

Solid - g/cm3 Liquid – g/ml

What is density… more specifically Physical Property Density reveals how tightly the molecules composing the matter are packed and how heavy the molecules are Compared to the liquid they are in, less dense materials float, more dense sink Substances are often IDed by their density, as it is rare for two substances to have the same density

Density and States of Matter Solids – composed of tightly packed molecules, low kinetic energy, high density (Iron)

Density and States of Matter Liquids – more loosely packed than solids, density less than solids (water)

Density and States of Matter Gases – molecules are all over the place, density less than solids and liquids (air)

How to Calculate Density Mass is determined using a scale Volume is calculated several different ways

Finding Volume To find the volume of a liquid, use a graduated cylinder Make sure to read the bottom of the meniscus

Finding Volume Length x Width x Height Volume of a regular object, such as a wooden block

Finding Volume Water Displacement Method - Read the initial volume of water in a graduated cylinder - Place object into cylinder - Read the final volume of water - Final – Initial = Volume of the object

Odd Shaped Marble Lab Complete the density lab at your desk, when you finish complete the density calculations practice

Density Calculation Practice Complete the calculations at your desk. Calculations not completed in class will be completed for HW

Exit Ticket Write the density of water that you calculated in parts A and C on the board in the appropriate column. Why do we see variation? What could be the source? Which method of calculating density is most precise?

Exit Ticket: Think about the densities of the following substances Exit Ticket: Think about the densities of the following substances. Use the density to answer the following questions. A. Lead B. Feathers

Which has a greater mass, 6.00 g of lead or 7.00 g of feathers? A. Lead B. Feathers feathers

Which occupies a greater volume, 5. 00 cm3 of lead or 5 Which occupies a greater volume, 5.00 cm3 of lead or 5.00 cm3 of feathers? A. Lead B. Feathers neither

Which occupies a greater volume, 5.00 g of lead or 5.00 g of feathers? A. Lead B. Feathers feathers

Which occupies a greater volume, 9.00 g of lead or 50.0 g of feathers? A. Lead B. Feathers feathers

Which occupies a greater volume, 50.0 g of lead or 9.00 g of feathers? A. Lead B. Feathers Not enough information to determine