A certain material has an electron binding energy of 245.9 kJ/mol.  What is the threshold frequency needed to remove the electron in terahertz (1 THz = 1 × 1012 Hz)?

Q: Al (s) WFe:0s (s) Fe(s) + %Al:0s(s) AH - 212.25k) (b) The mass of the Al need to produce 1 k of…

A: Answer;- This question is answered by using the simple concept of stoichiometry which involves the…

Q: Find the missing value for the radioactive isotope. (Round your answer to two decimal places.)…

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Q: ta 17 La carga nuclear efectiva de un átomo es principalmente afectada por: ponder Seleccione una: a…

A: The correct answer is -  electrones internos (inner electrons)   Explanation - - > The effective…

Q: The half-life of the radioactive isotope 137Cs is 30.17 years. How long does one have to wait until…

A: To solve this problem we have to first calculate the rate constant of the reaction using half life…

Q: As recently as the late 1970s, some wrist watches were manufactured using tritium (3H) as a…

A: t1/2 of 3H = 4500 days 43 years ago, a watch was purchased.

Q: Iodine-131 has a half-life of 8.1 days and is used as a tracer for the thyroid gland. If a patient…

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Q: What is the half-life of the bizarre isotope Toddium - 419 (it is a makeup element) if after 4.00…

A: Time period, t = 4.00 weeks Initial amount, [A]o =950.0 g Final amount, [A] = 29.6875 g Calculation…

Q: Carbonic acid has how many equivalents based on its H+ atoms? (this time you can write the chemical…

A: Since you have posted multiple unrelated questions, we are entitled to answer the first only.

Q: Calculate the amount of mass in nanograms that is changed into energy when one mole of liquid water…

A: The chemical reaction,  H2 + 1/2 O2  ------> H2O

Q: infared radiation because it has a much lower frequency. 2. A blue shirt appears blue because the…

A: Since, you have posted a question with multiple subparts, we will solve the first three sub-parts…

Q: Write the isotope symbol for each radioisotope.    technetium-99: iridium-192: strontium-89:

A: EXPLANATION: Isotope is defined as the chemical element which has one of two or more forms that have…

Q: 15. Scientists use carbon dating to determine the age of fossils. 14C is a rare isotope of carbon…

A: Answer - The correct option is (A) 14C and 14N have the same    -   Atomic mass    The atomic number…

Q: When radioactive C-14 converts spontaneously to N-14, what change must have occured in the nucleus?…

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Q: Determine the binding energy in lithium-7.  (1 amu = 1.6606 x 10-27 kg; speed of light = 3 x…

A: Given : Lithium-7 1 amu=1.6606×10-27 kg Speed of light=3×108 m/sec To Find : Binding energy Solution…

Q: Matter has been described as condensed energy. Using Einstein’s equation, calculate the amount of…

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Q: 1. Radioactivity * A. is spontaneous B. involves change in nuclear shape C. none of the above D.…

A: Radioactivity is the process of  decay where nucleus break down to form a stable nucleus.

Q: Č. 1H + 1H →H+ d. 24H +2H → 3½HE+ +21H → 42HE+ 'on f. 32HE +21H → 42He+ е. Stellar Formation and…

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Q: You just started a new job and a fellow researcher found a fossil that they believed to be 20,000…

A: Given: Half-life of the new isotope = 2000 years. And the actual age = 4000 years.

Q: The binding energy of the first level in an atom is 2.2 × 10 -18 J, and the binding energy of the…

A: The binding energy of the first level in an atom is = = 2.2 × 10 -18 J The binding energy of the…

Q: hen an iron core reaches a mass so large that even degenerate electrons can no longer support it and…

A: degeneracy pressure halts the collapse

Q: 16. The chemical reaction for photosynthesis is 6 CO2 + 12 H20 + light energy C6H1206 + 6 02 + 6 H20…

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Q: If there are 52 milligrams left from a 0.26-gram sample of a radioactive substance after 46 hours,…

A: In this question, we have to calculate the half life If there are 52 milligrams left from a…

Q: 7. The electrons in the hydrogen atom are at the activation energy level 1. 7.3 Find the kinetic…

A: To Find the kinetic energy of the electrons in first energy level vc state.

Q: Americium-241 is widely used in smoke detectors. Calculate the amount of Americium-241 consumed in a…

A: Given: The initial concentration of Americium-241= 3.80µg The half-life of Americium-241=433 years.…

Q: An unknown substance is exposed to 275nm light. Several electrons are ejected with 9.75 x 10-20J of…

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Q: 21. 2 jHeliumj atoms undergo fusion.

A: Nuclear reaction: The given reaction is a nuclear reaction. In the nuclear reaction, one nuclide is…

Q: It radioactive isotope of an unknown element is an extremely hazardous species if a 56 g sample of…

A: For readio activity the rate law is lna(a-x)= kt    a = initial concentration, ( a-x) =…

Q: The radioactive isotope Thallium-201 is used in medical diagnosis and treatment. A gamma ray emitted…

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Q: Select the basic fusion reaction of the universe. O A. 2 3 4 1 H + Не Не + H 1 2 2 1 ОВ. 1 Li H + 1…

A: The correct option is:

Q: Select the basic fusion reaction of the universe. A. 1 H   +   3 He   →   4 H   +   0 e 1 2 2 -1 B.…

A: fusion cycle releases energy in the core of the star. It is this fusion cycle that generates energy…

Q: Differentiate between the followings. 1. Atomic number and mass number: 2. Isotope and radioisotope…

A: Atomic number Mass number The atomic number is the total number of protons in the atom or ion.…

Q: When light is shined on a thin sheet of metal, electrons are released with a kinetic energy of 7.12…

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Q: The control of nuclear fission reactions is managed by introducing materials that absorb   Question…

A: Nuclear chemistry is defined as branch of chemistry in which nuclear reactions, radioactivity and…

Q: Can someone help me solve these problems?

A: “Since you have asked multiple question, we will solve the first question for you. If you want any…

Q: Determine the binding energy in lithium-7.  (1 amu = 1.6606 x 10-27 kg; speed of light = 3 x…

A: Binding energy is the amount of energy required to seperate neutron and proton.  This can be…

Q: A particular isotope of an element has a half-life of 56 days. What percentage of the sample will…

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Q: If the half-life of a radioactive element is 219.3 years and the atomic weight of the radioactive…

A: The number of decay in 1 second for 1 gram sample of a radioactive element is known as Specific…

Q: 2. The data in the table show the amount of a 500 g sample of sodium-24 over time. Time (h) Na-24…

A: The decomposition of a radioactive nuclei takes place by the removal alpha, beta or gamma particle.…

Q: Strontium-85, used for bone scans, has a half-life of 65 days. How long will it take for the…

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Q: Dinosaur fossils are often dated by using an element other than carbon, like potassium-40, that has…

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Q: Which conservation law is violated in the strong nuclear reaction p + n → p + \overline{p}p​ + n

A: In nuclear reaction,  atomic mass and atomic number are balanced.  In nuclear reaction mass is not…

Q: 131| is a B-emitter (half-life = 8.040 days) used in medicine for the diagnosis and treatment of…

A: Half life=8.040 Starting amount of sample =2.05

Q: A radioisotope has a 15-second half-life. After 45 seconds there will be   0% left   50% left   25%…

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Q: A particular radioactive element has a half-life of 63 days. What percent of the original sample is…

A: The time taken during a reaction to reduce the concentration of a reactant to half of its initial…

Q: Different radioisotopes (Links to an external site.) have different half-lives (Links to an external…

A: 1. Half-life of a radioactive element is the time taken by it to decease it's concentration by a…

Q: .67492716 × 10-24 g c) 1.092263 x 10–12 J/nucleon eon cleon d) 8 7381 x 10-12 J/nucleon

A: Mass of Be-8 = 1.32931×10-23 g  Mass of protons (mp) =1.67262158×10-24 g Mass of Neutron(mp) =…

Q: 46. A 4.1-ug sample of cesium-137 yields an activity of 3800 uCi. What is the SI value for this…

A: We are authorized to answer one question at a time, since you have not mentioned which question you…

Q: 5) Iodide I-123 (as sodium Iodide I-123) is a radioactive isotope of iodine used in nuclear medicine…

A: Hello. Since your question has multiple sub-parts, we will solve first three sub-parts for you. If…

Q: By which process does a molecule absorb light? O An electron goes from a lower energy level to a…

A: We have to predict correct option for the absorption of light by molecule.

Quantum Chemistry

Quantum chemistry deals with the properties of chemical systems and their reactions. The branch of chemistry which is more concerned with quantum chemistry is physical chemistry. It is a more sophisticated field of theoretical physics which is concerned towards the application of physical concepts towards various chemical aspects such as, formation of atoms, chemical structure descriptions, chemical bond strength, hybridization, conjugation etc. Quantum chemistry mainly studies the various states i.e., ground state, excited state, transition states of the individual atoms or molecules taking place during any chemical reaction. The laws of motion explained by various scientists, which are termed as “classical mechanics” were not acceptable in terms of electrons, protons, atoms, light etc. Thus, a new theory named “quantum mechanics” emerged to understand the basic framework of various atomic and subatomic particles.