Class 39 1
... just free an electron from its atom. So the final state of the electron should have zero total energy (i.e., K = U = 0.) Thus, the ionization energy is 0 – En = -En. Because an Li2+ ion has only one orbiting electron, it is like a hydrogen atom with a nuclear charge of +3e. We can use Bohr’s model t ...
... just free an electron from its atom. So the final state of the electron should have zero total energy (i.e., K = U = 0.) Thus, the ionization energy is 0 – En = -En. Because an Li2+ ion has only one orbiting electron, it is like a hydrogen atom with a nuclear charge of +3e. We can use Bohr’s model t ...
SLE133 – “Chemistry in Our World” Summary Notes Week 1
... Isotopes are atoms with identical atomic numbers but different mass numbers. Eg: Isotopes of Hydrogen; Isotope Symbol Atomic Number Mass Number ...
... Isotopes are atoms with identical atomic numbers but different mass numbers. Eg: Isotopes of Hydrogen; Isotope Symbol Atomic Number Mass Number ...
Chapter 7
... A. Wave Nature of light Light is electromagnetic radiation. A type of energy embodies in oscillating electric and magnetic fields ...
... A. Wave Nature of light Light is electromagnetic radiation. A type of energy embodies in oscillating electric and magnetic fields ...
Family
... Family 18 – Noble Gases (this family contains only gases) Families 13-16 get their name from the first element in the family. The other ten families (3-12) are called the transition metals. ...
... Family 18 – Noble Gases (this family contains only gases) Families 13-16 get their name from the first element in the family. The other ten families (3-12) are called the transition metals. ...
Define:
... 71. What is the frequency of ultraviolet light with a wavelength of 4.92 x 10-8m? 72. What is the wavelength of a gamma ray with a frequency of 3.72 x 1020Hz? 73. If three electrons are available to fill three empty 2p orbitals, how will the electrons be distributed? 74. Stable electron configuratio ...
... 71. What is the frequency of ultraviolet light with a wavelength of 4.92 x 10-8m? 72. What is the wavelength of a gamma ray with a frequency of 3.72 x 1020Hz? 73. If three electrons are available to fill three empty 2p orbitals, how will the electrons be distributed? 74. Stable electron configuratio ...
PHY140Y 32 The Pauli Exclusion Principle
... with a proton. However, the behaviour of multi-electron systems was quite enigmatic. What was observed was that multi-electron atoms seemed to have periodic properties. As you added electrons to the atom, one found that the electrons appeared to occupy increasingly higher-energy “shells,” with two e ...
... with a proton. However, the behaviour of multi-electron systems was quite enigmatic. What was observed was that multi-electron atoms seemed to have periodic properties. As you added electrons to the atom, one found that the electrons appeared to occupy increasingly higher-energy “shells,” with two e ...
Atomic Theory - World of Teaching
... Atoms are NOT the same as molecules. Air and oxygen are NOT the same. Helium and hot air are NOT the same. ...
... Atoms are NOT the same as molecules. Air and oxygen are NOT the same. Helium and hot air are NOT the same. ...
Elements and Atoms
... • To make molecules, you must have elements. • Elements are made of atoms. While the atoms may have different weights and organization, they are all built in the same way. ...
... • To make molecules, you must have elements. • Elements are made of atoms. While the atoms may have different weights and organization, they are all built in the same way. ...
Atomic number
... increased pressure affects the human body by increasing thea) body’s temperature b) Amount of dissolved gases in the body c) Amount of suspended solids in the body d) Concentration of minerals in the body The correct answer is “b” ...
... increased pressure affects the human body by increasing thea) body’s temperature b) Amount of dissolved gases in the body c) Amount of suspended solids in the body d) Concentration of minerals in the body The correct answer is “b” ...
Semester Exam Practice Questions
... 48. The formula mass of magnesium chloride, MgCl2, is __________. a. 59.8 amu c. 95.2 amu b. 76.4 amu d. 125.8 amu 49. If one molecule of NH3 has a mass of 17.0 g/mol, what is the mass of 6.02 x 1023 molecules of NH3? a. 2.82 g c. 102 g b. 17.0 g d. 2.82 x 10-25 g 50. Which of the following statemen ...
... 48. The formula mass of magnesium chloride, MgCl2, is __________. a. 59.8 amu c. 95.2 amu b. 76.4 amu d. 125.8 amu 49. If one molecule of NH3 has a mass of 17.0 g/mol, what is the mass of 6.02 x 1023 molecules of NH3? a. 2.82 g c. 102 g b. 17.0 g d. 2.82 x 10-25 g 50. Which of the following statemen ...
CHEM1411,chapter 1-2-3 exercises 1. In 1828, the diameter of the
... 18. When octane (C8H18) is burned in a particular internal combustion engine, the yield of products (carbon dioxide and water) is 93%. What mass of carbon dioxide will be produced in this engine when 15.0 g of octane is burned with 15.0 g of oxygen gas? A) 13. g B) 12. g C) 21 g D) 54. g E) 43. g ...
... 18. When octane (C8H18) is burned in a particular internal combustion engine, the yield of products (carbon dioxide and water) is 93%. What mass of carbon dioxide will be produced in this engine when 15.0 g of octane is burned with 15.0 g of oxygen gas? A) 13. g B) 12. g C) 21 g D) 54. g E) 43. g ...
Nuclear and Particle Physics
... α deflected less than β ⇒ α must have larger mass γ not deflected ⇒ uncharged ...
... α deflected less than β ⇒ α must have larger mass γ not deflected ⇒ uncharged ...
Unit 1
... Shared electron spends more time around the bigger nucleus of the Oxygen atom This leaves the hydrogen end with a net positive charge & the Oxygen end with a net negative. A polar molecule due to the charge difference from one end of the molecule to the other. ...
... Shared electron spends more time around the bigger nucleus of the Oxygen atom This leaves the hydrogen end with a net positive charge & the Oxygen end with a net negative. A polar molecule due to the charge difference from one end of the molecule to the other. ...
Unit 1
... Shared electron spends more time around the bigger nucleus of the Oxygen atom This leaves the hydrogen end with a net positive charge & the Oxygen end with a net negative. A polar molecule due to the charge difference from one end of the molecule to the other. ...
... Shared electron spends more time around the bigger nucleus of the Oxygen atom This leaves the hydrogen end with a net positive charge & the Oxygen end with a net negative. A polar molecule due to the charge difference from one end of the molecule to the other. ...
Class 22
... Random nature of the photons is a consequence of: a) quantum theory of light b) can be proven by thought experiments starting from Maxwell’s equations c) not a consequence of anything: this is just what the experiments show. It is a postulate of quantum theory of light, i.e. a statement without ...
... Random nature of the photons is a consequence of: a) quantum theory of light b) can be proven by thought experiments starting from Maxwell’s equations c) not a consequence of anything: this is just what the experiments show. It is a postulate of quantum theory of light, i.e. a statement without ...
Assignment-11 Definitions, Energy band Diagrams
... area of 2 × 10−4 mm2 , and a length of 5 mm. What is the voltage drop across the strip for a current of 50 mA. 4. For the aluminum strip described above in Prob.2, what current exists if the voltage across the strip is 30µV ? 5. The specific density of tungsten is 18.8g/cm3 , and its atomic weight i ...
... area of 2 × 10−4 mm2 , and a length of 5 mm. What is the voltage drop across the strip for a current of 50 mA. 4. For the aluminum strip described above in Prob.2, what current exists if the voltage across the strip is 30µV ? 5. The specific density of tungsten is 18.8g/cm3 , and its atomic weight i ...
Atomic theory
In chemistry and physics, atomic theory is a scientific theory of the nature of matter, which states that matter is composed of discrete units called atoms. It began as a philosophical concept in ancient Greece and entered the scientific mainstream in the early 19th century when discoveries in the field of chemistry showed that matter did indeed behave as if it were made up of atoms.The word atom comes from the Ancient Greek adjective atomos, meaning ""uncuttable"". 19th century chemists began using the term in connection with the growing number of irreducible chemical elements. While seemingly apropos, around the turn of the 20th century, through various experiments with electromagnetism and radioactivity, physicists discovered that the so-called ""uncuttable atom"" was actually a conglomerate of various subatomic particles (chiefly, electrons, protons and neutrons) which can exist separately from each other. In fact, in certain extreme environments, such as neutron stars, extreme temperature and pressure prevents atoms from existing at all. Since atoms were found to be divisible, physicists later invented the term ""elementary particles"" to describe the ""uncuttable"", though not indestructible, parts of an atom. The field of science which studies subatomic particles is particle physics, and it is in this field that physicists hope to discover the true fundamental nature of matter.