Category: Physics

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? 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 […]

Can a fish live without eyes? A fish in the wild could never survive without eyes because it couldn’t see predators approaching or find food. In a tank, however, they can live without being able to see. Can a fish regrow an eye? Unlike what is possible with the human eye, fish are able to […]

How does snow help a sled move down a hill? Forces and Newton’s Laws of Motion. A sled and its rider are moving at a speed of along a horizontal stretch of snow, as Figure 4.24a illustrates. The snow exerts a kinetic frictional force on the runners of the sled, so the sled slows down […]

Does CH4 have a dipole? The dipole moment of methane CH4 is zero. Is CH4 a dipole-dipole force? Also CH4 molecules cannot have permenant dipole-dipole attractions because each of the species bonded to the carbon is identical and CH4 has a tetrahedral shape. Therefore the strongest intermolecular forces between CH4 molecules are Van der Waals […]

How are fuel classified give two examples? Generally, fuels can be classified into two factors: Wood, natural gas and petroleum are the example of natural fuel whereas coal tar, producer gas tanbark are the example of artificial fuels. Note: The energy produced by the combustion of one kilogram of fuel is known as its calorific […]

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 five factors that affect the rate of a chemical reaction? Five factors typically affecting the rates of chemical reactions will be explored in this section: the chemical nature of the reacting substances, the state of subdivision (one large lump versus many small particles) of the reactants, the temperature of the reactants, the concentration […]

What is the mirror image of point 3 9? The mirror image of the point (x, y) in the x-axis is the point (x, -y). Thus, the mirror image of (3, 9) in x-axis is (3, -9). How do you find the mirror image of a line? Reflection – of a line segment Every point […]

Is magnesium sulfate safe in water? Read more A looong arrow, pointing right chloride, sodium bicarbonate, potassium bicarbonate, magnesium sulfate, and other compounds. No reason to worry, though. Salts and minerals like these typically present in trace amounts in your water and are very safe. What is magnesium sulfate good for? Magnesium sulfate is a […]