science 12 grade

The mass of 1/12 th 12 C isotope of carbon is now the standard used for defining one atomic mass unit (a.m.u). It is equal to 1.66 x 10 -24..

The molecular mass of a substance is the relative mass of its molecule as compared with the mass of a 12 C atom taken as 12-units. It indicates the number of times; one molecule of the substance is heavier than at..

Atomic number = number of protons = 11Mass number = number of protons + number of neutrons= 11 + 12 = ..

Carbon monoxide (CO): 12 parts by mass of carbon combines with 16 parts by mass of oxygen. Carbon dioxide (CO2): 12 parts by mass of carbon combines with 32 parts by mass of oxygen. Ratio of the masses of oxygen that combines with a fixed mass of carbon (12 parts) 16:..

Ratio of C atoms to H atoms is 5:10 = 1:2Empirical formula is C 1 H..

The first zone, 10 to 12 km from the surface of the earth is called troposphere. Oxygen is present here. At higher altitudes, some of us find it difficult to breathe, as the oxygen content is reduce..

Question: Two bodies of mass 10 kg and 12 kg are falling freely. What is the acceleration produced in the bodies due to force of gravity? Answer: The acceleration due to gravity produced in both the bodies is the same as it is independent of the mass of the body. Acceleration ..

Question: Carbon-12 atom has_______________. 1. 6 electrons, 6 protons, 6 neutrons 2. 6 electrons, 12 protons, 6 neutrons 3. 12 electrons, 6 protons, 6 neutrons 4. 18 electrons, 6 protons and 6 neutrons Answer: ..

India possesses the largest cattle population in the world. But the average milk yield of a cow in India is much less than in many other countries. About 70% of the cattle are dry and the others give an average of just 1-2 litres of milk per day. The following are some breeds of cows dom..

are a pair of tubes of about 12cm in length. They run from the ovaries of each side to the uterus. At the ovarian end the tube is funnel-shaped with the end of the tube thrown into number of folds. These folds are ciliated which help to sweep the egg produced by the ovary into the fallop..