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Answers
Explanation:
1Acute Diseases Chronic Diseases
These diseases occur suddenly. They occur over a prolonged period.
They last for a shorter period. They last longer, even for a lifetime.
They do not cause damage to the body. They damage the body of the patient.
They are not usually fatal (however, other underlying conditions can also affect the outcome of the disease) Chronic diseases usually end up causing long term damage to organs and organ systems. In some cases, it can become fatal
Eg., common cold, jaundice, typhoid, malaria Eg., HIV, Elephantiasis, Cancer, Tuberculosis
2-Diarrhea that lasts for more than a week
Dry cough
Memory loss, depression and neurological disorders
Pneumonia
Profound, unexplained fatigue
Rapid weight loss
3-Newton's law of universal gravitation is usually stated as that every particle attracts every other particle in the universe with a force that is directly proportional to the product of their masses and inversely proportional to the square of the distance between their centers. Formula
F=G{\frac{m_1m_2}{r^2}}
F = force
G = gravitational constant
m_1 = mass of object 1
m_2 = mass of object 2
r = distance between centers of the masses
4-The mole is an amount unit similar to familiar units like pair, dozen, gross, etc. It provides a specific measure of the number of atoms or molecules in a bulk sample of matter. A mole is defined as the amount of substance containing the same number of discrete entities (atoms, molecules, ions, etc.)
Answer:
In order to understand the various chemical reactions that occur around us and the parameters governing these reactions, we need an understanding of the elements and compounds taking part in these reactions. The early developments in science revealed that matter is made up of atoms which in turn are composed of elementary particles known as electrons, protons and neutrons. In order to have a better understanding about the transformations of matter from one form to the other, the scientists needed a defined structure for an atom and its interaction with other atoms. J.J. Thomson, an English scientist, proposed the famous Thomson atomic model in the year 1898 just after the discovery of electrons.
Plum Pudding Atomic Theory
Thomson proposed that the shape of an atom resembles that of a sphere having a radius of the order of 10-10 m. The positively charged particles are uniformly distributed with electrons arranged in such a manner that the atom is electrostatically stable. Thomson’s atomic model was also called as the plum pudding model or the watermelon model. The embedded electrons resembled the seed of watermelon while the watermelon’s red mass represented the positive charge distribution. The plum pudding atomic theory assumed that the mass of an atom is uniformly distributed all over the atom.
Limitations of Thomson’s Atomic Model
Thomson’s atomic model explained the overall neutrality of an atom. Its assumption that the total mass of an atom is uniformly distributed all over the atom was inconsistent with some experimental results. Rutherford’s gold foil experiment of scattering α-particles revealed that most of the space in an atom is empty contradicted Thomson’s atomic model. Thus, it was found that the plum pudding atomic model was insufficient to explain the structure of an atom.
The limitations of Thomson’s atomic model triggered further researches for establishing the structure of an atom. The plum pudding atomic model lacked experimental evidence and hence Rutherford conducted many experiments in order to determine the structure of an atom.
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