7th+Grade+Physical+Science+Day+9

[7th Grade] [7th Grade Assignment Sheets] Geography] Language Arts] Math] Physical Science] Physical Science Unit Plan] Day 1] 2] 3] 4] 5] 6] 7] 8] [9] 10]

Subject: ** Science
 * 
 * Topic: **Making Sense of Density
 * Grade Level: **7th
 * Teacher: **Ms. TenBroeck


 * Time Frame: **45 minutes

determine its density. Students should also understand at the end of the lab how different sizes affect density because they will be breaking the object into smaller parts.
 * Overall goal/purpose: ** The purpose of this lesson is for students to work with objects’ mass and volume to

11.A.3c > Collect and record data accurately using consistent measuring and recording techniques and media. 12.C.3b > Model and describe the chemical and physical characteristics of matter (e.g., atoms, molecules, elements, compounds, mixtures).
 * State Standards **

Students will find the density of objects using a cylinder and a balance to first find the objects’ mass and volume. Students will identify which objects would sink to the bottom and which would float based on the densities they calculate in the activity.
 * Instructional Objectives **

<span style="font-family: 'Times New Roman','serif'; font-size: 12pt; line-height: 115%;">For demonstration: beaker, vegetable oil, water, corn syrup For each group: balances, water, paper towels, ruler, graduated cylinder, wooden stick (aprx. 6 cm), modeling clay, crayon with no paper, data table, procedures
 * <span style="font-family: 'Times New Roman','serif'; font-size: 12pt; line-height: 115%;">Materials: **

dense. Have a beaker full of water and pour in corn syrup and vegetable oil. The density of water is 1 gram per cubic centimeter. The density of corn syrup is greater than that so it sinks below the water. The density of vegetable oil is less than that so it stays above the water. It will separate into three layers, starting from the bottom: corn syrup, water, vegetable oil.
 * <span style="font-family: 'Times New Roman','serif'; font-size: 12pt; line-height: 115%;">Procedures: **
 * //<span style="font-family: 'Times New Roman','serif'; font-size: 12pt; line-height: 115%;">Focus attention/motivation: //**<span style="font-family: 'Times New Roman','serif'; font-size: 12pt; line-height: 115%;"> Show demonstration of how things that are denser sink in those that are less

has a volume of 38.5 cm^3 and a mass of 277 g. What is its density? Density= Mass/Volume (*Math connection: multiplying and dividing with decimals).
 * //<span style="font-family: 'Times New Roman','serif'; font-size: 12pt; line-height: 115%;">Instruction: //**<span style="font-family: 'Times New Roman','serif'; font-size: 12pt; line-height: 115%;">Review a problem with the class calculating density using the formula. Example: a piece of metal

Explain the lab that students will be doing. They will be finding the density of different objects in a beaker of water, then breaking the objects in half to find the density of its pieces.

table to keep track of the objects’ masses, volume changes, and densities. Each group will also be given a copy of the instructions at their station. The procedures for the lab are as follows: 1. Find the mass of the wooden stick using a balance. Record mass in data table. 2. Add water to the graduated cylinder so that the stick will be submerged when put in the cylinder. Measure the volume of the water without the stick in it. 3. Place the stick in the graduated cylinder. Measure the new volume. 4. Find the difference between the two volumes in step 2 and 3. This is the volume of the stick. Record this volume in the data table. 5. The density of the stick is its mass divided by its volume. Calculate the density and record it in the data table 6. Thoroughly dry the stick with a paper towel and carefully break it into 2 pieces. Repeat steps 1-5 with each of the 2 pieces. 7. Repeat all steps using the clay rolled into a rope. 8. Repeat all steps using the crayon. After the lab, students will work in their groups to answer a few questions following the procedures such as: 1) Compare the density of the whole object with its pieces. 2) How can the results help explain how density can be used to identify a material? 3) Why did you have to dry the objects in step 6?
 * //<span style="font-family: 'Times New Roman','serif'; font-size: 12pt; line-height: 115%;">Student Engagement: //**<span style="font-family: 'Times New Roman','serif'; font-size: 12pt; line-height: 115%;"> Students will be performing a lab dealing with density. I will give each student a data

which objects were denser. Going back to the demonstration at the beginning of class, ask what the order of the objects would be if they were all submerged in water at the same time.
 * //<span style="font-family: 'Times New Roman','serif'; font-size: 12pt; line-height: 115%;">Closure //**<span style="font-family: 'Times New Roman','serif'; font-size: 12pt; line-height: 115%;">: Discuss findings in the lab. Have students share their answers to the questions following the lab and ask

Have students write a few discoveries for the day in their science journals.

discoveries. I will go around to each lab to do a performance assessment throughout the lesson. Their ability to connect the demonstration at the beginning of the class to the densities found in the lab will show if they understand that denser objects would sink lower than the other objects.
 * <span style="font-family: 'Times New Roman','serif'; font-size: 12pt; line-height: 115%;">Assessment: **<span style="font-family: 'Times New Roman','serif'; font-size: 12pt; line-height: 115%;"> Students will be assessed by their responses to the questions following the lab as well as their

the lab aloud as well as give each student a copy of the procedures. Students who struggle with the lab will not need to break the objects into pieces; just find the density of the whole object. They will still get the main concept if they just do the whole objects.
 * <span style="font-family: 'Times New Roman','serif'; font-size: 12pt; line-height: 115%;">Accommodations: **<span style="font-family: 'Times New Roman','serif'; font-size: 12pt; line-height: 115%;">For this lab, students will be working in groups of mixed ability. I will read the instructions for