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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
First element known to be radioactive?
Uranium is the first element known to be radioactive. It was discovered by Henri Becquerel in 1896.
Does ice melting depend on temperature?
Temperature is an important factor, but temperature alone cannot predict that ice will melt. Adding the heat of fusion to ice at zero degrees centigrade will cause it to melt without elevating its temperature, and removing the heat of fusion from water at zero degrees centigrade will cause it to freeze without lowering its temperature.
How does the earths crust move?
The Earth's crust moves primarily due to the process of plate tectonics. This movement is driven by the flow of semi-fluid rock in the mantle beneath the crust, causing the plates to collide, separate, or slide past each other. This movement leads to events such as earthquakes, volcanic eruptions, and the formation of mountain ranges.
What are inducible and non inducible enzymes?
Inducible: usually off for protein synthesis but can be turned on Non inducible, or REPRESSIBLE : usually on for protein synthesis but can be turned off Inducible: usually off for protein synthesis but can be turned on Non inducible, or REPRESSIBLE : usually on for protein synthesis but can be turned off
Who discovered hydrogen in 1766?
Henry Cavendish is credited with the discovery of hydrogen in 1766. He identified it as a distinct element and named it "inflammable air."
What are the chemical properties of vinegar?
some chemical properties of vinegar would be it is
transparent
flammable but not explosive
reactive
does not rust
so those are just a few but i hope they help.
What other type of cell has a cell wall?
Bacteria also have a cell wall, which provides structure, support, and protection to the bacterial cell. This structure is made of different materials compared to plant cell walls, such as peptidoglycan.
What is the formula for potassium nitrate dissolved in water?
The chemical formula for potassium nitrate dissolved in water is KNO3(aq), which shows that potassium nitrate has dissociated into its constituent ions (K+ and NO3-) in the water solution.
What is a producer in biology?
a producer in biology is always a plant. it gives food to every living organism.
since it produces its own food it can supply other with food. It's like the produce section in the grocery store. Producer= produce.
What are two ways in which mixtures differ from compounds?
The ingredients in a mixture are not in any fixed proportion to each other; they are in fixed proportions in a compound.
The individual components in a mixture keep their own characteristics but the components of a compound have different characteristics than those of the individual parts.
The components of a mixture are unchanged from their original states and can be separated by physically means. The components of a compound are chemically and physically altered from their original states and cannot be separated from the compound by physical means.
A mixture is prepared by physical means and can be separated by physical means, while a compound is prepared chemically and may (generally) disitegrate chemically, although not necessarily to original components
A compound has single boyling, freezing points while a mixture may have
some, or range
Which what?
What are facts about ''lithium''?
lithium is toxic to man and animal also it is a soft, silvery, highly reactive metallic element that is used as a heat transfer medium, in thermo-nuclear weapons, and in various alloys, ceramics, and optical forms of glass.
- Lithium was discovered by Johann Arfvedson.
- It was discovered in 1817.
- Lithium was discovered in the mineral petalite
- Lithium derives from the Greek word lithos for stone.
- Lithium is the third element on the periodic table.
- Lithium is in group 1 and period 2.
- The symbol for lithium is Li.
- The atomic weight of lithium is 6.941.
- Lithium has a melting point of 180.54°C.
- The boiling point of Lithium is 1342°C.
- Lithium is the lightest of the metals.
- It has a density of half of water.
- Lithium has the highest specific heat of any solid element.
- Metallic lithium is silvery in appearance.
- Lithium reacts with water.
- Lithium as a metal itself burns a bright white.
- Lithium is corrosive and requires special handling.
- Lithium is used in heat transfer applications.
- It is used as an alloying agent,
- It is used in synthesizing organic compounds,
- Lithium is added to glasses and ceramics. I
- Lithium is an Alkali Metal
- Lithium has 1 oxidation state
- This is one of the only metals that cannot be found in its pure form.
- It has two isotopes; Lithium-7 (92.5%) and Lithium-6 (7.5%).
- It also has three radio-active isotopes: Li-5, Li-8, and Li-9.
- Lithium has 3 protons, 3 electrons, and 4 neutrons
- It is used as a Drug, to help people with Bipolar Disorders or Manic Depressions. Bipolar Disorders are not curable though but its medicine can help you.
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How do planes reduce air resistance?
You can reduce the amount of friction by putting wheels on an object or by taking away all of the grip on the object. You can also make dure the groung is really slippery. You can by adding oil to make it slippery ths is done in most of the machines and gadgets that we use daily.friction will also be reduced if surface is smooth or slippery
Why are cells considered the basic units of life?
Cells are called the basic unit of life because, all living things come from other living things.
- cells are called the basic units of life, because all living things are made from cells. (some living things are unicellular,have 1 cell, and some living things are multicellular,have more than 1 cell) human beings are multicellular, while bacteria are unicellular.
Henry Cavendish is credited with the discovery of hydrogen in 1766.
In a laboratory.
It is a radio-active element, and will only be found in very specialist labs. dealing with radio-active materials.
The francium ion is found on Earth, but only in the most minute amounts, as to untraceable.
platinum was discovered in 1888 in the nickel, copper ores in ontario
European reference to platinum appeared in 1557 by Julius Caesar Scaliger
the year 1748
What did people believe that things were made out of before cells were discovered?
Before cells were discovered, many people believed that living things were made of a mysterious substance called "vital force" or "vital essence." This substance was thought to give living organisms their characteristics and separate them from non-living matter. It wasn't until the discovery of cells that scientists understood the true building blocks of life.
What element turns white when exposed to air?
Phosphorus is an element that turns white when exposed to air. When pure, it is a colorless and transparent waxy solid.
In the Zhou Dynasty (1045-256 BCE) of ancient China, magnetism was discovered when a Chinese philosopher discovered the Lodestone. That is the most believed theory. You can find more tales about who discoved magnetism on the web.
When was carbon dioxide discovered and by whom?
Joseph Black, Scottish chemist and physician, in 1754.
What is the importance of chemistry for society?
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How can you tell if a glacier had once moved across a region?
Signs that indicate a glacier once moved across a region include: striations on rocks, moraines (ridges of debris), U-shaped valleys, glacial polish on bedrock, and erratic boulders (rocks that are different from the surrounding bedrock).
What are earth's main geographic features?
Earth's main geographic features include continents, oceans, mountains, valleys, deserts, rivers, and lakes. These features shape the planet's landscape and play a crucial role in determining the climate and ecosystems across different regions.
What did Michael Faraday make in 1824?
In 1824, Michael Faraday invented the first electric motor. He demonstrated the principle of electromagnetic rotation, which led to the development of the modern electric motor.
