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History of Science
Find questions about the origin and important events that led to the development of the different Sciences.
9,329 Questions
Who discovered that atoms contain subatomic particles?
J.J. Thomson discovered the first subatomic particle, the electron, in the late 19th century through his experiments with cathode rays. This discovery led to the understanding that atoms contain subatomic particles.
3 common disorders of the integumentary system?
The integumentary system is the organ system comprised of the skin (including hair, feathers, scales, hooves, and nails). Three common disorders of the integumentary system are Psoriasis, Acne, and Athlete's foot.
What is the Calvin cycle responsible for?
The Calvin cycle is responsible for converting carbon dioxide from the atmosphere into glucose through a series of biochemical reactions in the stroma of chloroplasts. This process is essential for plants to produce sugars and other organic compounds needed for growth and energy production.
What happens to a hydrogen atom ina acid when the acid is dissolved in water?
When a hydrogen atom in an acid is dissolved in water, it can donate its extra proton (H+) to the water molecules, forming hydronium ions (H3O+). This process increases the concentration of hydronium ions in the solution and decreases the pH, making it more acidic.
How is aluminum isolated from it's natural form?
Aluminum is isolated from its natural form, bauxite ore, through the Bayer process which involves dissolving the ore in sodium hydroxide to extract alumina. The alumina is then electrolyzed in a Hall-Héroult cell to obtain pure aluminum metal.
A body which is not liminous, of course. Now, you just have to figure our what "liminous" is. I suggest the OED, Earth's nearest equivalent to the Maximegalon Dictionary, as it's certainly not a common word (except as a misspelling for "luminous").
The man who gave cells the basic units of life their name?
The man who gave cells the basic units of life their name would be Robert Hooke. He is the one who discovered cells and named them cells because the looked like jail cells.
What did Lavoisier discovered during his experiments?
Mikhail Lomonosov and Antoine Lavoisier are both credited with experiments that led to the formulation of the Law of Mass Conservation. The experiments involved rusting or melting metals inside sealed containers. The weight of these containers did not change despite the contents having changed.
What structures provide support in the cell?
Structures such as the cytoskeleton (made up of proteins like actin, tubulin, and intermediate filaments) provide support and shape to the cell. Additionally, extracellular matrix proteins outside the cell can also provide support and structure.
What advances in the evolutionary development have the liverworts made over the thallophytes?
The liverwort is a member of the bryophyte family. The bryophytes are mostly made up of mosses and resemble the algae of the thallophyte family in many ways, however the bryophytes have evolved into a multi-cell organism while the thallophytes are only single-celled.
What are the two main sources of energy on earth that can drive ecosystem?
From our closest star: Hydrogen fusion (The Sun)
from under our feet: Geothermal heat; geothermal energy originates from the original formation of the planet (20%) and from radioactive decay of minerals (80%)
What damage did Mount Augustine cause after each eruption?
After the 1986 eruption, Mount Augustine caused ashfall and lahars, which damaged vegetation, infrastructure, and caused the closure of nearby towns. The 2006 eruption resulted in ash plumes that disrupted air travel and caused respiratory issues for nearby residents. Eruptions in 2005 and 2006 also triggered avalanches and lahars that affected the surrounding landscape.
What is the net photosynthetic equation?
The net photosynthetic equation is: 6CO2 + 6H2O + light energy -> C6H12O6 + 6O2. This represents the process by which plants convert carbon dioxide and water into glucose and oxygen in the presence of sunlight.
Who discovered the subatomic particles and in which order?
Electron: J. J. Thomson, 1897
Proton: Ernest Rutherford, 1919
Neutron: James Chadwick, 1932
What organelle takes raw materials and converts them to cell products?
This depends on the organism.
Some unicellular Protists, like the Paramecium, can bring food particles inside the cell via food vacuoles. Digestive enzymes can then break down the food particles so that they may be utilized by the mitochondria as an energy source (cellular respiration converts the energy in food molecules into the cell's direct energy source, ATP).
In animal cells, some raw materials may be taken up by endocytosis and the formation of a membrane bubble around the ingested particles; which may then fuse with another vesicle containing digestive enzymes; collectively called a lysosome at that point.
Where is johannes Kepler buried?
Johannes Kepler is buried in Regensburg, Germany at St. Peter's Cemetery.
What were john Dalton's hobbies?
John Dalton's hobbies included meteorology, linguistics, and teaching. He was also interested in the study of color blindness, which eventually led to the discovery of Daltonism, a type of color vision deficiency.
Why does a d-block have elements a variable valency?
D-block elements have variable valency because they have incompletely filled d-orbitals that can participate in bonding in different ways by different combinations of oxidation states. This allows d-block elements to readily form multiple ions with different charges.
What is the process of breaking colloids?
Breaking colloids involves destabilizing the system through methods such as heating, adding electrolytes, or changing the pH. This causes the colloidal particles to aggregate and separate from the dispersion medium. The resulting precipitation or coagulation allows for the separation and purification of the components.
The statement is known as the octet rule. Atoms are most stable when their outermost energy level is filled with eight electrons, known as an octet. This stability is achieved by gaining, losing, or sharing electrons with other atoms to complete the octet.
What side of the periodic table are non-metals on?
The nonmetals are located on the right side of the periodic table, after the transition metals and metalloids. Specifically, they are located after the stair set of metalloids: B, Si, Ge, As, Sb, Te, Po.
Why did Mendeleev have question marks in his table?
Mendeleev grouped the elements in series according to their properties and atomic weight. His rule of thumb of giving priority to chemical properties, among other effects, left him with spots where he couldn't insert any of the elements known in his time -- germanium ang gallium come to mind. In group IIIa between aluminum and indium, and in group IVa between silicon and tin, there should have been two other elements, with properties intermediary between those of Al and In, respectively Si and Sn. Given that no such elements were known at the time, he left the spots empty, predicting that they will be discovered in the future, and called the two missing elements eka-aluminium ("similar to aluminum") and eka-silicium ("similar to silicon"). As it happens, he was right!
Those empty spots are where the question marks go. Of course, using a question mark is not mandatory -- anything that can be understood as "something is missing here" will do.
As a side note, these two were by far not the only "missing" elements when Mendeleev initially published his periodic table. Many of the places of transitional elements, discovered later, would have been "question marks", including all transuranic and transplutonic ones (which are artificial, synthesized only in the 20th century), as well as most the heavier radioactive elements in the main groups (francium, radium, polonium, astatine, radon etc.).
Yes, all living organisms share the same four nucleotides that make up DNA: adenine, thymine, cytosine, and guanine. The unique arrangement and quantity of these nucleotides in an organism's DNA are what determine its genetic characteristics and differences from other organisms. These variations in DNA sequence and content contribute to the diversity seen among different species.
Does gas have fast moving particles?
yes. gas has the fastest moving particles and a solid has the slowest moving particles and particles in a liquid are moving faster than solid particles but not as fast as gas particles.
How did the view of the ocean by early Mediterranean cultures influence the naming of planet earth?
As the early Mediterranean cultures viewed the planet as large landmasses surrounded by smaller bodies of water it is easy to understand their misconception of the planet being composed of more earth than water
