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

[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: ** Mixtures
 * Grade Level: ** 7th
 * Teacher: ** Ms. TenBroeck


 * Time Frame: ** 45 minutes

The purpose of this lesson is for students to be able to determine the difference between the two types of mixtures (heterogeneous and homogeneous) and how they can be separated. They should also understand that mixtures are made up of different substances.
 * Overall goal/purpose: **

IL.12.C.3b > Model and describe the chemical and physical characteristics of matter (e.g., atoms, molecules, elements, compounds, mixtures).
 * State Standards: **

Students will separate items into groups to discover what a mixture is and that its components represent substances. Students will identify mixtures as either hetergeneous or homogeneous. Students will separate mixtures using the supplies given at different stations.
 * Instructional Objectives: **

<span style="font-family: 'Times New Roman','serif'; font-size: 12pt; line-height: 115%;">3 mixtures (sand and water, salt-water, and iron filings and salt), checkers, marbles, paperclips, bottle of water + crystal light, plates, beakers, funnels, filter paper
 * <span style="font-family: 'Times New Roman','serif'; font-size: 12pt; line-height: 115%;">Materials: **

Focus Attention/Motivation //**<span style="font-family: 'Times New Roman','serif'; font-size: 12pt; line-height: 115%;"> Each table of students will have 2 piles of items (marbles, checkers, and paper clips) on their table. They will leave one pile alone and separate the other into similar objects (checkers, paperclips, and marbles in three different groups). Explain that the unsorted pile represents a mixture. Ask what they can infer that the separated objects represent. (Substances; and they should know this because they learned about substances the day before). Instruction //** <span style="font-family: 'Times New Roman','serif'; font-size: 12pt; line-height: 115%;">Discuss the two types of mixtures: heterogeneous and homogeneous. Use the mixture they just worked with as an example of a hetergenenous mixture because you can see each of the parts. Have students brainstorm other examples of heterogeneous mixtures (ex: soil, salad).
 * <span style="font-family: 'Times New Roman','serif'; font-size: 12pt; line-height: 115%;">Procedures: **
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Show a bottle of water mixed with crystal light or sugar. This is an example of a homogeneous mixture. Ask students if they can infer what a homogeneous mixture is using this example (it is mixed evenly, so you cannot see the crystals in the water). Student Engagement //** <span style="font-family: 'Times New Roman','serif'; font-size: 12pt; line-height: 115%;">There will be 3 stations set up: one with a sand and water mixture, one with a mixture of iron fillings and table salt, and another with a salt-water mixture. In groups, students will be given about 10 minutes at each station to separate the mixtures. First, they should identify whether it is a hetergeneous mixture or a homogeneous mixture (with each other, they do not need to write it down). Then, with the given supplies, they will try to figure out how to separate the mixtures. I will have slips of paper with the steps for how to separate each incase students need assistance. Each station will work as follows, and there will be enough of each mixture for each group to work with:
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1. Sand & water: (heterogeneous) There will be a beaker, a funnel, and filter paper. To separate the mixture, the funnel should be placed over the beaker with the filter paper inside the funnel. When you pour the mixture into the funnel, the water will go through the filter paper and into the beaker, leaving the sand inside the funnel.

2. Iron filings & table salt: (heterogeneous) A mixture of iron filings and salt will be on a plate. There will be an additional empty plate for one of the substances once the mixture is separated. There will also be a magnet. This one is simple: when you hold the magnet over the mixture it will pick up the iron filings which can then be put on the empty plate.

3. Salt-water Mixture: (homogeneous) This one is more difficult to separate and the last step will need to be left until the following day. The salt water mixture will be in a beaker and students will need to heat the mixture so it boils. This will be the only step that can be done for the day, because the mixture will need to be left so that the water can evaporate. Once the water evaporates, the salt will be left behind. Closure //** <span style="font-family: 'Times New Roman','serif'; font-size: 12pt; line-height: 115%;">After students have completed the 3 mixtures, we will discuss the activity. I will ask students how they separated the mixtures and how they knew what kind of mixtures they were. Students will also write in their science journals what they discovered for the day (*Journal is connected with Language Arts).
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<span style="font-family: 'Times New Roman','serif'; font-size: 12pt; line-height: 115%;">Students will be assessed on the progress they make from activity to activity in their understanding. I will be able to see their progress by how much assistance they need. They will also be assessed by the discoveries they keep track of in their journals for the day.
 * <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;">Prentice Hall Physical Science
 * <span style="font-family: 'Times New Roman','serif'; font-size: 12pt; line-height: 115%;">Resources: **

<span style="font-family: 'Times New Roman','serif'; font-size: 120%;">The slips of paper with the steps for separating each mixture are an accommodation for those who need more assistance than others. Students who need a handout of notes may also be given one with an explanation of hetergeneous and homogeneous mixtures to follow along with the instruction.
 * <span style="font-family: 'Times New Roman','serif'; font-size: 12pt; line-height: 115%;">Accommodations: **