Future Middle School Teachers Receive NASA Lesson in STEM Instruction. Middle School Science Activities. Scientific American Frontiers: Alan Alda. Epic chemistry teacher gives the best classes. Make Rain Indoors! Science Experiments For Kids. Cell Size and Scale. Some cells are visible to the unaided eye The smallest objects that the unaided human eye can see are about 0.1 mm long.
That means that under the right conditions, you might be able to see an ameoba proteus, a human egg, and a paramecium without using magnification. A magnifying glass can help you to see them more clearly, but they will still look tiny. Smaller cells are easily visible under a light microscope. It's even possible to make out structures within the cell, such as the nucleus, mitochondria and chloroplasts.
To see anything smaller than 500 nm, you will need an electron microscope. Adenine The label on the nucleotide is not quite accurate. How can an X chromosome be nearly as big as the head of the sperm cell? No, this isn't a mistake. The X chromosome is shown here in a condensed state, as it would appear in a cell that's going through mitosis. A chromosome is made up of genetic material (one long piece of DNA) wrapped around structural support proteins (histones). Carbon. Science Resources (Grades 5-12)
Awesome ways To Start a Fire with Water. The Sci Guys: Science at Home - SE2 - EP3: Homemade Petri Dish - Growing Bacteria at Home. Make Glowing Water with Black Light. What you'll need: A black light (you can find them at places like Walmart and hardware stores, as well as online stores like Amazon).
Tonic water or a highlighter pen. A dark room to do the experiment. Instructions: If you are using a highlighter pen carefully break it open, remove the felt and soak it in a small amount of water for a few minutes. What's happening? Simple explanation: The ultra violet (UV) light coming from your black light lamp excites things called phosphors. Black lights are used in forensic science, artistic performances, photography, authentication of banknotes and antiques, and in many other areas. Detailed explanation: Black light (also known as UV or ultra violet light) is a part of the electromagnetic spectrum. Downloadable Java Applets from PhET. PWHS: Thermodynamics: Lab 2 Sample Writeup. Sample Writeup for “Ice Melters” Demonstration: Materials: Two basically identical pieces of ice A styrofoam block A metal block Procedure: A piece of ice was placed on the styrofoam block and on the metal block at the same time.
We watched to see which piece of ice would melt faster. The blocks had been in the same room together all night long. Observations and Data: The ice that was placed on the styrofoam block took a very long time to melt – upwards of 15 minutes. After the ice had melted on the metal block, a student compared the temperature of the metal block with another, identical metal block that had also been sitting in the room all night but had not been in contact with the ice by touching them with his hands and comparing how hot or cold they felt. Discussion and Analysis: The metal block and styrofoam block are made of two different substances. Conclusion: Heat conductivity measures the rate at which heat can be transmitted through a substance. Home. Bill Nye: The Science Guy - Energy (Full Episode)
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