Why do objects like wood float in water? Does it depend on …
Why do objects like wood float in water? Does it depend on size? Create a custom object to explore the effects of mass and volume on density. Can you discover the relationship? Use the scale to measure the mass of an object, then hold the object under water to measure its volume. Can you identify all the mystery objects?
Technological advances, breakthroughs in interpretation, and new observations continuously refine our understanding …
Technological advances, breakthroughs in interpretation, and new observations continuously refine our understanding of the Earth and solar system. The invention of the telescope provided powerful and confounding observations that rapidly challenged the Earth-centered model. Students will investigate how technology has impacted innovations in other fields like astronomy and advanced our knowledge of the solar system substantially in the last half century.
Determine the dew point temperature for your classroom through a hands-on experiment. …
Determine the dew point temperature for your classroom through a hands-on experiment. Use humidity and temperature probes to investigate the temperature at which it would rain in your classroom! Learn about water density and the conditions necessary to produce fog or rain.
In this lesson, students will increase their skills in both life science …
In this lesson, students will increase their skills in both life science and computer science as they create their own dichotomous keys. By gathering a collection of items, they will learn how to use compound conditionals and if-statements to construct a dichotomous key that allows their classmates to identify their items accurately. This exercise encourages students to explore the life sciences and helps them develop critical thinking and programming skills necessary in computer science.
The Did You Feel It (DYFI) Annual Summary Webage and Viewer are …
The Did You Feel It (DYFI) Annual Summary Webage and Viewer are resources that are ideal for Earth Science and Geography laboratiory activitiy.
Students may connect to a database of factual information collected by the USGS on Earthquakes and other seismic disturbances.
The data graphically shows the highest intensity felt at each location searched. The data is grouped into 10 km blocks, and the color of each block corresponds to the highest intensity calculated for that block (regardless of which event).
Explore how molecules can cross a cell membrane and learn about the …
Explore how molecules can cross a cell membrane and learn about the nature of their movement. Set up the model with high oxygen and low carbon dioxide outside the cell and low oxygen and high carbon dioxide inside the cell. In which direction do the oxygen and carbon dioxide molecules move?
Explore the role of pore size in the diffusion of a substance …
Explore the role of pore size in the diffusion of a substance across a membrane. Diffusion is the process of a substance spreading out from its origin. Molecules diffuse through random molecular motion. Diffusion is always happening, even when a system appears to have reached equilibrium, because molecules are always moving. Cells are selectively permeable, meaning that their membranes allow some substances to cross easily while others are unable to cross without assistance. Cell membranes are selectively permeable, in part because its pores are small, allowing the cell to prevent larger molecules from moving across the membrane.
Movement of ions in and out of cells is crucial to maintaining …
Movement of ions in and out of cells is crucial to maintaining homeostasis within the body and ensuring that biological functions run properly. The natural movement of molecules due to collisions is called diffusion. Several factors affect diffusion rate: concentration, surface area, and molecular pumps. This activity demonstrates diffusion, osmosis, and active transport through 12 interactive models.
This minds-on analysis and discussion activity helps students understand that cell size …
This minds-on analysis and discussion activity helps students understand that cell size is limited by the very slow rate of diffusion over any substantial distance and the insufficient surface-area-to-volume ratio for larger cells. In addition, students calculate why these problems do not apply to long slender cells or parts of cells (e.g. the axons of neurons that extend from your spinal cord to your foot). To maximize student participation and learning, I recommend that you have your students complete the questions individually or in pairs and then have a whole class discussion.
Explore the role of a molecule's mass with respect to its diffusion …
Explore the role of a molecule's mass with respect to its diffusion rate. Diffusion is the process of a substance spreading out from its origin. Molecules diffuse through random molecular motion. Diffusion is always happening, even when a system appears to have reached equilibrium, because molecules are always moving. Massive molecules have more kinetic energy than less massive molecules at the same temperature.
Explore the role of temperature in the rate of diffusion of a …
Explore the role of temperature in the rate of diffusion of a substance. Diffusion is the process of a substance spreading out from its origin. Molecules diffuse through random molecular motion. Diffusion is always happening, even when a system appears to have reached equilibrium, because molecules are always moving. When molecules are heated, they move faster.
Explore the role of temperature in the rate of diffusion of a …
Explore the role of temperature in the rate of diffusion of a substance. Diffusion is the process of a substance spreading out from its origin. Molecules diffuse through random molecular motion. Diffusion is always happening, even when a system appears to have reached equilibrium, because molecules are always moving. When molecules are heated, they move faster.
In this activity, students create digital flashcards to review DNA content (guiding …
In this activity, students create digital flashcards to review DNA content (guiding study questions and key are provided). Students can use full-screen mode with the document to quiz his/herself with the flashcards.
Theresa Sincere-Eastman of Loudoun created this presentation for teachers moving to online …
Theresa Sincere-Eastman of Loudoun created this presentation for teachers moving to online teaching. It has several tips and links to supportive resources.
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