Who invented radioactive? Henri Becquerel How did we discover uranium? Uranium was discovered in 1789 by Martin Klaproth, a German chemist, who isolated an oxide of uranium while analyzing pitchblende samples from the Joachimsthal silver mines in the former Kingdom of Bohemia, located in the present day Czech Republic. He named his discovery “uran” after […]
Why is francium so reactive?
Why is francium so reactive? Explanation: Francium is an alkali metal in group 1/IA. All alkali metals have one valence electron. This makes it easier to remove the electron and makes the atom more reactive. Why is F2 so reactive? Why is fluorine gas (F2) reactive if it is already a molecule? This is because […]
Why does boiling point of isomeric alkanes decrease with branching?
Why does boiling point of isomeric alkanes decrease with branching? Where you have isomers, the more branched the chain, the lower the boiling point tends to be. Van der Waals dispersion forces are smaller for shorter molecules and only operate over very short distances between one molecule and its neighbors. Which has more boiling point […]
Is dull a metal or nonmetal?
Is dull a metal or nonmetal? Properties Metals Non-metals Appearance Shiny Dull State at room temperature Solid (except mercury, which is a liquid) About half are solids, about half are gases, and one (bromine) is a liquid Density High (they feel heavy for their size) Low (they feel light for their size) Strength Strong Weak […]
What are the 4 types of winds?
What are the 4 types of winds? The Four Major Wind Systems and Wind Belts: The four major wind systems are the Polar and Tropical Easterlies, the Prevailing Westerlies and the Intertropical Convergence Zone. These are also wind belts. There are three other types of wind belts, also. Does wind always blow in same direction? […]
What do you do if someone is choking and becomes unresponsive?
What do you do if someone is choking and becomes unresponsive? What should I do if a choking adult becomes unconscious? If a conscious choking adult becomes unconscious, carefully lower the person to the ground, open the mouth and look for an object. If an object is seen, remove it with your finger. Open the […]
Why does the mercury not fall a rise in the clinical thermometer when taken out of the mouth?
How did movable type impact China?
How did movable type impact China? Bi Sheng’s movable type changed how ancient China printed its documents, making printing more efficient and easier. Instead of carving an entire book into one huge block, characters are carved into small clay blocks. Why is printing important to modern society? The printing press allows us to share large […]
Which protein is used for muscle contraction?
Which protein is used for muscle contraction? Tropomyosins How does the structure of protein affect muscle contraction? Protein structure affects muscle contraction and enzyme activity. It affects muscle contraction by the ATP/ADP changes in the myosin structure and troponin/tropomyosin interaction blocks binding of myosin to actin. What are the two most important proteins involved in […]
What is the difference between isotopic mass and atomic mass?
What is the difference between isotopic mass and atomic mass? While atomic mass is an absolute mass, relative isotopic mass is a dimensionless number with no units. This loss of units results from the use of a scaling ratio with respect to a carbon-12 standard, and the word “relative” in the term “relative isotopic mass” […]