Valence electrons occupy the outermost shell or highest energy level of an atom while core electrons are those occupying the innermost shell or... View Article
Sodium is an alkali metal that comes first in the 3rd period of the periodic table. It is the 11th element, that is, its atomic number is 11.... View Article
Answer: A pure substance does not have any other substance or impurity present and cannot be separated into other kinds of matter by physical... View Article
The charge of the ion is -2 and the oxidation number of an individual oxygen atom is -2. Let oxidation number of sulfur be x. x+4(-2)=-2 x-8=-2... View Article
A tetrahedral is an object that has a central atom surrounded by four other atoms. The central atom bonds with each of the surrounding atoms,... View Article
Potential energy is the amount of energy it acquires due to that Potential difference. Potential is the ability of an object to do some work.... View Article
Calcium carbonate react with carbon dioxide and water to produce calcium hydrogen carbonate. The reaction proceeds at room temperature. CaCO3 +... View Article
Bioindicators are living organisms such as plants, planktons, animals, and microbes, which are utilized to screen the health of the natural... View Article
The molecular weight is the mass of one mole of a substance. Usually, the units used for this are grams per mole. The molecular weight of a pure... View Article
Dipole-dipole interactions occur when partial charge form within a molecule because of the uneven distribution of electrons. Dipole-dipole... View Article
The term luster refers to the quantity and quality of the light which is reflected from a mineral's exterior surfaces. Luster provides an... View Article
The compound eyes of arthropods like insects, crustaceans and millipedes are composed of units called as ommatidia. An ommatidium contains a... View Article
The concentration of ions in solution depends on the mole ratio between the dissolved substance and the cations and anions it forms in solution.... View Article
Freefall is defined as a situation when a body is moving only under the influence of the earth’s gravity. Since external force is acting on the... View Article
Burning of paper is not a physical change. Ash is formed as result of burning of paper which is a new product. Chemical change a new substance... View Article
Boyle's law states for a fixed amount of an enclosed ideal gas, its absolute pressure is inversely proportional to its volume at a constant... View Article
The heat of hydrogenation is less than expected because benzene is stabilized by resonance. Cyclohexene has one double bond, and its heat of... View Article
