HighFour Chemistry Round 1 Category C: Grades 9 – 10 Thursday
... I2 (iodine gas) Reviewing the data provided, it is clear that iodine gas (I2) has the largest molecular weight, and consequently, has the greatest strength of van der Waals’ forces. It would need a higher energy to break apart these forces. This translates into a higher boiling point. In conclusion, ...
... I2 (iodine gas) Reviewing the data provided, it is clear that iodine gas (I2) has the largest molecular weight, and consequently, has the greatest strength of van der Waals’ forces. It would need a higher energy to break apart these forces. This translates into a higher boiling point. In conclusion, ...
Chapter 5
... general organization of the table, rows (periods) and columns (groups) main group, transition metals, lanthanides, actinides valence electrons for main group elements alkali metals, alkali earth metals, halogens, noble gases metals, nonmetals, metalloids (semimetals); general properties and location ...
... general organization of the table, rows (periods) and columns (groups) main group, transition metals, lanthanides, actinides valence electrons for main group elements alkali metals, alkali earth metals, halogens, noble gases metals, nonmetals, metalloids (semimetals); general properties and location ...
november 2009 - The University of Sydney
... Consider a hydrogen atom in its first excited state (n = 2). A photon from an external source is absorbed by the atom and causes the atom to ionise. Suppose the photon had exactly the right amount of energy to ionise the excited atom and no extra. (i) (ii) (iii) ...
... Consider a hydrogen atom in its first excited state (n = 2). A photon from an external source is absorbed by the atom and causes the atom to ionise. Suppose the photon had exactly the right amount of energy to ionise the excited atom and no extra. (i) (ii) (iii) ...
Artificial atoms
... adding or removing electrons. There the electrons interact with the fixed potential of the nucleus and with each other, and these two kinds of interaction determine the spectrum. In an artificial atom, however, one can change this spectrum completely by altering the atom's geometry and composition. ...
... adding or removing electrons. There the electrons interact with the fixed potential of the nucleus and with each other, and these two kinds of interaction determine the spectrum. In an artificial atom, however, one can change this spectrum completely by altering the atom's geometry and composition. ...
2.4. Quantum Mechanical description of hydrogen atom
... The beam of ground state hydrogen atom splits into two beams. This contradicts the theory, since we have expected 1, 3, 5,. . . beams! Conclusion: • Pauli (1925): a „fourth quantum number” is needed; • Goudsmit and Uhlenbeck suggested the concept of spin, as the „internal angular momentum” Classical ...
... The beam of ground state hydrogen atom splits into two beams. This contradicts the theory, since we have expected 1, 3, 5,. . . beams! Conclusion: • Pauli (1925): a „fourth quantum number” is needed; • Goudsmit and Uhlenbeck suggested the concept of spin, as the „internal angular momentum” Classical ...
Chapter 3: Stoichiometry
... Method of decomposition into component elements such as CO 2, H2O, NH3, etc. and weighing amounts. Empirical Formula: Simplest whole number ratio of atoms in the compound; ex. HO Molecular Formula: Actual number of atoms in smallest unit that exists of the molecule; ex. H 2O2 In Class Examples: a) C ...
... Method of decomposition into component elements such as CO 2, H2O, NH3, etc. and weighing amounts. Empirical Formula: Simplest whole number ratio of atoms in the compound; ex. HO Molecular Formula: Actual number of atoms in smallest unit that exists of the molecule; ex. H 2O2 In Class Examples: a) C ...
2nd Semester Exam Review
... Assumptions of the Kinetic Molecular Theory • Gasses consist of small particles that take up little volume relative to the volume of empty space around them – Gas molecules are very far apart and therefore don’t experience attractive or repulsive forces. ...
... Assumptions of the Kinetic Molecular Theory • Gasses consist of small particles that take up little volume relative to the volume of empty space around them – Gas molecules are very far apart and therefore don’t experience attractive or repulsive forces. ...
Phonons II
... • Be careful! Phonons do not carry momentum like photons do. They can interact with particles as if they have a momentum. For example, a neutron can hit a crystal and start a wave by transferring momentum to the lattice. • However, this momentum is transferred to the lattice as a whole. The atoms th ...
... • Be careful! Phonons do not carry momentum like photons do. They can interact with particles as if they have a momentum. For example, a neutron can hit a crystal and start a wave by transferring momentum to the lattice. • However, this momentum is transferred to the lattice as a whole. The atoms th ...
L35 - University of Iowa Physics
... • Niels Bohr, a Danish physicist, used the quantum concept to explain the nature of the atom. • Recall that the orbiting electrons, according to classical ideas, should very quickly radiate away all of its energy • If this were so, then we would observe that atoms emit light over a continuous range ...
... • Niels Bohr, a Danish physicist, used the quantum concept to explain the nature of the atom. • Recall that the orbiting electrons, according to classical ideas, should very quickly radiate away all of its energy • If this were so, then we would observe that atoms emit light over a continuous range ...
Chapters 21-29
... no work on a moving charged particle? (a) The magnetic field is conservative. (b) The magnetic force is a velocity dependent force. (c) The magnetic field is a vector and work is a scalar quantity. X(d) The magnetic force is always perpendicular to the velocity of the particle. (e) The electric fiel ...
... no work on a moving charged particle? (a) The magnetic field is conservative. (b) The magnetic force is a velocity dependent force. (c) The magnetic field is a vector and work is a scalar quantity. X(d) The magnetic force is always perpendicular to the velocity of the particle. (e) The electric fiel ...
periodic trends
... you go down a group for metals the number of energy levels increase. Because of this, reactivity increases because the atom is more willing to give away its electron (react). ...
... you go down a group for metals the number of energy levels increase. Because of this, reactivity increases because the atom is more willing to give away its electron (react). ...
Quantum Physics 3 - FSU Physics Department
... Stern-Gerlach results cannot be explained by interaction of magnetic moment from orbital angular momentum must be due to some additional internal source of angular momentum that does not require motion of the electron. internal angular momentum of electron (“spin”) was suggested in 1925 by Gou ...
... Stern-Gerlach results cannot be explained by interaction of magnetic moment from orbital angular momentum must be due to some additional internal source of angular momentum that does not require motion of the electron. internal angular momentum of electron (“spin”) was suggested in 1925 by Gou ...
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.