Changes in Density (pg603)
MrAsciencedotcom
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Grade Levels
6th - 9th
Subjects
Resource Type
Standards
NGSSMS-ESS2-3
NGSSMS-ESS2-2
NGSSMS-ESS2-1
NGSSMS-ESS2-4
NGSSMS-ESS2-6
Formats Included
- Word Document File
Pages
4 pages
MrAsciencedotcom
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Also included in
This is a bundle of all of the lessons, labs, PowerPoints, and worksheets for Unit 6: Earth's Systems. The bundle also includes the Unit 6 Test and its answer key. For a walkthrough of the unit, including pictures and videos, please click here.Price $14.99Original Price $19.00Save $4.01
This bundle includes an entire year's worth of material. It includes lessons, labs, projects, tests and more. The seven units include are as follows:Unit 1 - Forces and MotionUnit 2 - ChemistryUnit 3 - GeneticsUnit 4 - EvolutionUnit 5- AstronomyUnit 6 - Earth's SystemsUnit 7 - Environmental ScienceTPrice $100.00Original Price $139.00Save $39.00
Description
Today students investigated how the density of a material can change. When a substance is heated, the atoms and molecules vibrate, which increases the substance’s volume without changing its mass. As a result, its density goes down. When a substance is cooled, the opposite happens, and the density goes up. (Ice crystals are a notable exception this rule.) Today students took part in a lab that tested this effect. They observed how hot water floated because of this change in density. All you needed was some hot water, a pipette, and a bit of food coloring. They repeated the test with cold water and saw the opposite effect. Then they tested salt water. Because salt dissolves in water, filling the spaces between the water molecules, it makes the water heavier without affecting its volume. The result? Salt water has a higher density. (To see a video of the lab in action, please click here.)
Total Pages
4 pages
Answer Key
Not Included
Teaching Duration
45 minutes
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Standards
to see state-specific standards (only available in the US).
NGSSMS-ESS2-3
Analyze and interpret data on the distribution of fossils and rocks, continental shapes, and seafloor structures to provide evidence of the past plate motions. Examples of data include similarities of rock and fossil types on different continents, the shapes of the continents (including continental shelves), and the locations of ocean structures (such as ridges, fracture zones, and trenches). Paleomagnetic anomalies in oceanic and continental crust are not assessed.
NGSSMS-ESS2-2
Construct an explanation based on evidence for how geoscience processes have changed Earth’s surface at varying time and spatial scales. Emphasis is on how processes change Earth’s surface at time and spatial scales that can be large (such as slow plate motions or the uplift of large mountain ranges) or small (such as rapid landslides or microscopic geochemical reactions), and how many geoscience processes (such as earthquakes, volcanoes, and meteor impacts) usually behave gradually but are punctuated by catastrophic events. Examples of geoscience processes include surface weathering and deposition by the movements of water, ice, and wind. Emphasis is on geoscience processes that shape local geographic features, where appropriate.
NGSSMS-ESS2-1
Develop a model to describe the cycling of Earth’s materials and the flow of energy that drives this process. Emphasis is on the processes of melting, crystallization, weathering, deformation, and sedimentation, which act together to form minerals and rocks through the cycling of Earth’s materials. Assessment does not include the identification and naming of minerals.
NGSSMS-ESS2-4
Develop a model to describe the cycling of water through Earth’s systems driven by energy from the sun and the force of gravity. Emphasis is on the ways water changes its state as it moves through the multiple pathways of the hydrologic cycle. Examples of models can be conceptual or physical. A quantitative understanding of the latent heats of vaporization and fusion is not assessed.
NGSSMS-ESS2-6
Develop and use a model to describe how unequal heating and rotation of the Earth cause patterns of atmospheric and oceanic circulation that determine regional climates. Emphasis is on how patterns vary by latitude, altitude, and geographic land distribution. Emphasis of atmospheric circulation is on the sunlight-driven latitudinal banding, the Coriolis effect, and resulting prevailing winds; emphasis of ocean circulation is on the transfer of heat by the global ocean convection cycle, which is constrained by the Coriolis effect and the outlines of continents. Examples of models can be diagrams, maps and globes, or digital representations. Assessment does not include the dynamics of the Coriolis effect.
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