Density Water Displacement/ Practice

Objective: Today I will be able to: Analyze the relationship between mass and volume of matter Self-assess my performance on the data analysis and conclusion from lab Visualize the molecular structures of substances with different densities Apply the water displacement method to calculating density Correctly solve density problems Informal Assessment – monitoring student questions and group interactions during the lab Formal assessment – analyzing responses to the exit ticket, lab and practice problems Common Core Connection Make sense of problems and persevere in solving them Attend to precision Use appropriate tools strategically

Lesson Sequence Evaluate: Warm-Up Explain: Methods for Calculating Density Notes Engage/ Explore: Water Displacement lab Elaborate: Density Practice Problems Evaluate: Exit Ticket

Warm - Up How did you use math to analyze the relationship between mass and volume in lab yesterday? What did you notice about the densities of the three different volumes of water? Take out your lab from yesterday Check off the lab self-assessment sheet to see how you did on the lab

Objective Today I will be able to: Apply the water displacement method to calculating density Correctly solve density problems

Homework Study for a Metric System/Dimensional Analysis/Accuracy and Precision Quiz Friday Finish Density Practice Problems

Check Aspen!! See all the grading I’ve been helping with!

Agenda Warm-Up Lab Self-Assessment Revisit the exit ticket from yesterday Density and states of matter notes Methods for Calculating Density Notes Water Displacement activity Density Practice Problems Exit Ticket

Review your lab from yesterday. Check off only the bullets that you were successful in achieving Lab Self-Assessment

Lets do a quick warmup!

Q: 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

Which occupies a greater volume, 5.00 cm 3 of lead or 5.00 cm 3 of feathers? A. Lead B. Feathers

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

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

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

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 What is density… more specifically

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 are the molecules arranged differently in the lead block and feathers?

Methods for Calculating Density

Calculating Density Remember, Density = mass/volume 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

We will use the same groups as yesterday! Density Water Activity

Lab Safety/ Clean Up No closed toe shoes or aprons are required If you spill, clean the water with a paper towel When you finish collecting data, return the lab area as you found it

When you finish the lab activity begin working on the Density practice problems. Whatever problems you do not finish will become your homework. Density Practice

Exit Ticket Which of the following would be more dense. An 18 gram sample of water or an 18 gram sample of carbon dioxide. Explain your answer.