Given below is an essay on Yuan T. Lee.
Yuan T. Lee, whose full name is Yuan Tseh Lee, was born in Hsin-chu, Taiwan, on November 29, 1936. He is a Taiwanese-American chemist who shared the 1986 Nobel Prize in Chemistry with Dudley R. Herschbach and John C. Polanyi for his contributions to the study of chemical-reaction kinetics.
Lee completed his education at the University of California, Berkeley and in Taiwan (Ph.D., 1965). After completing postdoctoral studies at Harvard and Berkeley, he taught at the University of Chicago from 1968 until 1974. He relocated from Chicago to Berkeley after becoming a citizen in 1974, where he continued his research.
As a postdoctoral researcher, Lee experimented with and improved Herschbach's invention of the "crossed molecular beam technique," which brings together beams of molecules at supersonic speeds under controlled circumstances to enable close observation of the events that take place during chemical reactions. This method is derived from elementary particle physics. In order to further develop Herschbach's method, Lee used mass spectroscopy. This allowed him to recognize the byproducts of the reactions between oxygen and fluorine atoms and intricate organic molecules.
References:
https://www.britannica.com/biography/Yuan-T-Lee
https://www.infoplease.com/biographies/science-technology/yuan-t-lee
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complete and balance 2HNO3+NaCo3?
Answer:
Na2CO3 + 2HNO3 → CO2 + H2O + 2NaNO3
Explanation:
for each value of the principal quantum number n, what are the possible values of the electron spin quantum number ms ? (there may be more than one correct choice.)
There can be no zero for the main quantum number (n). Therefore, the permitted values for n are 1, 2, 3, 4, and so forth. Any integer between 0 and n – 1 can serve as the angular quantum number (l).
How is the n quantum number determined?The value of n is between 1 and the outermost electron shell of that atom. Looking at the period (numbered row) of the element on the periodic table will reveal the primary quantum number. The period number and the primary quantum numbers of electrons in the S-block and P-block are identical.
There are three values if n=3 is the primary quantum number. The electron is in a p-orbital state when l=1, and the electron.
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Balance the equation:
SO₂ +
Li₂Se →
SS₂ +
Li₂O
Answer:
Explanation:
english please
difference between kinetic and potential energy
Answer:
Kinetic energy has its determining factors and those are mass and speed or velocity
whereas the determining factors of potential energy are height, distance and mass.
EXAMPLE OF K.E
kinetic energy could be flowing water...
EXAMPLE OF P.E
potential energy is the water that is present at the top of the hill.
explain how a specific amino acid is joined to its appropriate trna; describe the energy source that drives this endergonic process.
Each aminoacyl-tRNA synthetase's active site fits a certain amino acid and its associated tRNA like a "lock and key." The amino acid is subsequently joined to the tRNA using ATP.
What is endergonic process?
A reaction in which energy is absorbed is referred to as an endergonic reaction. In terms of chemistry, this indicates that the net change in free energy is positive, meaning that the system has more energy at the conclusion of the reaction than it did at the start.Endergonic reactions require a gain in energy, therefore for the reaction to take place, the energy needs to come from somewhere else.Because most endergonic reactions use ATP, DNA and RNA production is interesting because it does not. As you may remember, the four bases of DNA are A, T, C, and G. Adenosine is represented by the "A" base pair, same like it is in ATP.ATP is one of the components used in DNA synthesis, as opposed to being used and then replenished. Trisphosphates of the base pairs ATP, TTP, CTP, and GTP are the first compounds used in the procedure.One of the nucleotide's phosphate groups separates when DNA polymerase positions one of these nucleotide triphosphates to attach to the expanding DNA strand; this is replaced by the establishment of a new bond between the nucleotide and the DNA strand.Hence lock and key model is used
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What is the name of the ion represented by the following
symbol? 02-
a oxygen ion
b dioxide
Coxide
d none of the above
Calculate the kinetic energy of the cart at the point shown below. It has a mass of 225 kg, is 10 m high, and is moving at a velocity of 2 m/s.
Average kinetic energy is the average sum of all kinetic energy of all the molecules of gases. Therefore, the kinetic energy of the cart is 450J. Average kinetic energy is directly proportional to temperature.
What is kinetic energy?
It is a energy which is possess by a moving object. It is very difficult to find the correct value of kinetic energy so we find average kinetic energy. Which is very easy to calculate as compared to calculating kinetic energy. It is not dependent on the type of gases or mass of gases.
Mathematically,
K.E=1/2mv²
Where,
m= mass of object= 225 kg
v= velocity of object= 2 m/s
substituting all the given values in the above equation, we get
K.E=1/2×225 ×2²
K.E=450J
Therefore, the kinetic energy of the cart is 450J.
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Help me please I beg me
.Which of the following elements would increase in size when it became an ion?
A Indium
B Lead
C Mercury
D Selenium
Answer: Selenium
Explanation: Selenium is a non metal
PLS ANSWER ASAP
How are natural resources managed for maximum usability and sustainability?
Which of these describes a way in which humans could increase biodiversity in a marine ecosystem?
A. Fish populations increase as dissolved oxygen decreases.
B. Data that shows how trees get affected by disease as levels of acid rain increases.
C. Data showing how forests grow when acidic precipitation decreases.
The statement that describes a way in which humans could increase biodiversity in a marine ecosystem is as follows: Fish populations increase as dissolved oxygen decreases (option A).
What is biodiversity?Biodiversity is the diversity (number and variety of species) of plant and animal life within a region.
It can be used more specifically to refer to all of the species in one region or ecosystem. Biodiversity refers to every living thing, including plants, bacteria, animals, and humans.
Marine ecosystem are aquatic environments with high levels of dissolved salt. These include the open ocean, the deep-sea ocean, and coastal marine ecosystems, each of which has different physical and biological characteristics.
The biodiversity of a marine ecosystem can be illustrated by the increase in fish populations in the marine environment, hence, option A is correct.
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2. what is the nuclear binding energy of silver-110 in units of j/nucleon? the mass of a silver- 110 nucleus is 109.90611 amu.
The nuclear binding energy of silver is 1.5E-24 j/nucleon where the mass of a silver is 110
Formula used
Binding Energy per Nucleon = (Mass Defect×931.5)/Mass Number
B.E per nucleon = (∆m×931.5)/A
The bare minimal amount of energy needed to separate an atom's nucleus into its component protons and neutrons—collectively referred to as nucleons—is known as the nuclear binding energy in experimental physics. For stable nuclei, the binding energy is always positive since the nucleus needs to gain energy for the nucleons to move apart from one another. The strong nuclear force pulls nucleons toward one another. The nuclear binding energy is thought to be negative in nuclear physics theory. When the constituent nucleons are infinitely far apart from one another, it shows the energy of the nucleus in relation to their energies. With slightly differing emphasis on what the binding energy signifies, the experimental and theoretical points of view are equivalent.
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Please do a half page report on Mauna Loa Volcano ‼️‼️
Explanation:
MAUNA LOA (VNUM #332020)
19°28'30" N 155°36'29" W, Summit Elevation 13681 ft (4170 m)
Current Volcano Alert Level: WARNING
Current Aviation Color Code: ORANGE
The Northeast Rift Zone eruption of Mauna Loa continues. One active fissure, fissure 3, is feeding a lava flow downslope.
Fissure 3 is generating a lava flow traveling to the north toward the Daniel K. Inouye Highway (Saddle Road) that has reached relatively flatter ground and slowed down significantly over the past several days, as expected.
As of 12 p.m. today, December 4, the flow front was about 2.25 mi (3.6 km) from the Daniel K. Inouye Highway (Saddle Road). Where the fissure 3 lava channel is branching, on the steeper slopes of the Northeast flank about half way down the lava flow, there were several small overflows recorded over the past day. During the past 24 hours, the lava flow advanced at an average rate of about 40 feet per hour (12 meters per hour). Though the advance rate has slowed over the past several days, the lava flow remains active with a continuous supply from the fissure 3 vent.
Advance rates may be highly variable over the coming days and weeks. On the flat ground between Mauna Loa and Mauna Kea, lava flows advance more slowly, spread out, and inflate. Individual lobes may advance quickly, and then stall. Additional breakouts may occur if lava channels get blocked upslope. There are many variables at play and both the direction and timing of flow advances are expected to change over periods of hours to days, making it difficult to estimate when or if the flow will impact Daniel K. Inouye Highway.
Sulfur dioxide (SO2) emission rates of approximately 180,000 tonnes per day (t/d) were measured on December 1, 2022 and remain elevated at this time. Volcanic gas is rising high and vertically into the atmosphere before being blown to the west at high altitude, generating vog (volcanic air pollution) in areas downwind. The International Volcanic Health Hazard Network has detailed information about
A given sample of n2 gas has a pressure of 0. 30 atm at 30. 0 °c. If the volume is 2. 0 l, how many moles of n2 are present?.
0.0781 mol of N2 would be there at a pressure of 0.3atm at 30°C
How does Avogadro's number help you discover moles?Avogadro's number can be used to convert between molecules and moles by multiplying or dividing: The amount of moles must be multiplied by 6.02 x 1023 to convert to molecules. Divide the number of molecules by 6.02 x 1023 to convert it to moles.
How to find number of moles?At STP defined as 0°C (273.15 K, 32°F) and 1 atm, the molar volume of a gas is 22.414 L/mol.
Use dimensional analysis to calculate the moles of nitrogen in 1.75 L at STP.
1.75 L N₂ × 1 mol/22.414 L = 0.0781 mol N₂ to three 2 significant figures.
How much is a mole?A mole is 6.02214076 x 1023 of any chemical unit, including atoms, molecules, ions, and others. Due to the large number of atoms, molecules, or other components that make up any substance, the mole is a useful unit to use.
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If a sample has 28g nitrogen and 64g oxygen, what is the empirical formula?
Considering the definition of empirical formula, if a sample has 28g nitrogen and 64g oxygen, the empirical formula is NO₂.
Definition of empirical formulaThe empirical formula is an expression that represents the atoms that make up a chemical compound regardless of its structure. It is therefore the simplest representation of a compound.
The empirical formula indicates the elements that are present and the minimum proportion in whole numbers that exist between its atoms.
Empirical formula in this caseIn this case, in first place you need to convert the number of grams given into percentage as follow, being the mass of the sample 92 grams (mass of nitrogen + mass of oxygen):
Nitrogen (N): (28 g÷ 92 g)× 100%= 30.43%Oxygen (O): (64 g÷ 92 g)× 100%= 69.57%Assuming a 100 grams sample, the percentages match the grams in the sample. So you have:
Nitrogen (N): 30.43 gramsOxygen (O): 69.57 gramsThen it is possible to calculate the number of moles of each atom in the molecule, taking into account the corresponding molar mass:
Nitrogen (N): 30.43 grams÷ 14 g/mole= 2.17 moles
Oxygen (O): 69.57 grams÷ 16 g/mole= 4.35 moles
The empirical formula must be expressed using whole number relationships, for this the numbers of moles are divided by the smallest result of those obtained. In this case:
Nitrogen (N): 2.17 moles÷ 2.17 moles= 1
Oxygen (O): 4.35 moles÷ 2.17 moles= 2
Therefore the N: O mole ratio is 1: 2
Finally, the empirical formula is N₁O₂= NO₂.
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What can a person do to limit exposure to x-rays?wear sunblockavoid cigarette smokewear a protective vestavoid chemicals.
X-rays are a form of indirectly ionizing radiation, and it can be really harmful to the humans health, so limiting the exposure is always a priority. Here, wearing a protective vest is the correct answer.
X-rays are a type of radiation that ionizes indirectly. Remember that ionization is what harms our cells, thus it is best to minimize exposure to these radiation types.
Now when X-rays are strong enough, they can penetrate through many ordinary materials (like wood, plastic, etc.) Also, once it enters in your body, a series of responses begin that cannot be stopped by outside forces.
Therefore, you should try to minimize your exposure. If possible, avoid being close to an X-ray source, but if that's not possible, use radiation protection.
Depending on the application, it can come in many shapes. For example, you can use LED screens to block out the fluence (flux of photons) that is focused at you. By placing these screens between you and the source, you can significantly reduce this fluence.
The same is true with protective vests that shield you from photons by absorbing them. These vests can include parts made of lead or other high atomic number materials.
So, a person can wearing a protective vest to limit exposure to X-rays.
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which of the following is a neutralization reaction? question 15 options: cao h2o --> ca(oh)2 co2 h2o --> h2co3 hno3 koh --> kno3 h2o 2 na cl2 --> 2 nacl
This reaction is neutralization reaction.
2HNO3+2KOH⇒ 2KNO3+2H2O
What is neutralization reaction?
A neutralization reaction is a type of chemical reaction in which an acid and a base react with one another to form a salt and water. The acid and the base each donate one or more protons (H+ ions) to form a neutral compound. This type of reaction is important in many everyday applications, from the neutralization of stomach acid to the processing of industrial waste.
Acid+Base⇒Salt+Water
The given reaction is neutralization reaction because potassium nitrate salt is formed, and water is produced.
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use the fiagram below to answer the following questions: a list the phase changes a sample of ice would go through if heated to its critical temperature and 1 atm pressure
The cell potential of an electrochemical cell with the cell reaction 2al(s) + 3zn2+(aq) → 3zn(s) + 2al3+(aq) is 1. 607 v. What is the maximum electrical work obtainable from this cell when 0. 50 g of al is consumed?
The cell potential of an electrochemical cell with the cell reaction is 1. 607 v. the maximum electrical work obtainable from this cell when 0. 50 g of al is consumed is - 9.3 × 10⁵ J.
The reaction is given as :
2Al + 3Zn²⁺ ----> 3Zn + 2Al³⁺
the maximum electrical work obtainable from this cell:
ΔG = - n FE°cell
where,
maximum electrical work = ΔG
n = no. of transfer electron = 2 × 3 = 6 e⁻
E°cell = 1.607 V
ΔG = - n FE°cell
ΔG = - 6 × 9.65 × 10⁴ × 1.607
ΔG = - 9.3 × 10⁵ J
Thus the maximum electrical work obtain from this cell is - 9.3 × 10⁵ J.
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write and balance the chemical equation for the reaction associated with the heat of formation for agno3
The balanced chemical equation for the reaction associated with the heat of formation for [tex]AgNO_{3}[/tex]
Decomposition is a type of chemical reaction when a single reactant breaks down into two or more different products. The term "thermal decomposition process" refers to the decomposition method used when heat is present.
The enthalpy change that takes place when 1 mole of a substance is created from its component elements in their standard states is known as the standard enthalpy of formation. A pure element has a standard enthalpy of production of 0 in its normal state.
Enthalpy of formation = Enthalpy change 1 mole of product formed from its original constituents.
[tex]Ag(s) + \frac{1}{2} N_{2}(g) + \frac{3}{2}O_{2} \rightarrow AgNO_{3}[/tex]
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Match the general type of chemical reaction to the example that best fits it.
A. Na + cl2 -> NaCl
B. H2O -> H2 + O2
C. C6H12O6 + O2 -> H2O + CO2 + energy
D. Al(OH)3 + Li -> LiOH + Al
E. HCl + NaOH -> NaCl + H2O
__Combustion reaction
__ Single replacement
__Double replacement
__Synthesis
__Decompostion
The classifications of the reactions are;
A . Synthesis
B. Decomposition
C. Combustion reaction
D. Single replacement
E. Double replacement
What is the type of reaction?We know that in chemistry, what we call a reaction has to do with the interaction that is taking lace between two or more substances and leads to the production of a new substances. We have to look at the reacts that are here and then know how to classify each one.
In fact the combustion reaction has to do with the burning of a species in air. A single replacement has to do with the substitution of a given specie in a compound with another. A double replacement reaction has to do with a case where the anions interchange cation partners. The synthesis reaction deals with the production of new compounds while the decomposition reaction has to do with the compound into its components.
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1. What is the charge of an atom with 20 protons and 18 electrons
Study the pattern of digits shown here. Each digit represents a square that is blank or filled in. 000010000 Which picture could be encoded by this pattern? Responses 9 squares in 3 rows and 3 columns, with only the center square filled in. 9 squares in 3 rows and 3 columns, with only the center square filled in. 9 squares in 3 rows and 3 columns, with alternating squares filled in and blank. 9 squares in 3 rows and 3 columns, with alternating squares filled in and blank. 9 squares in a column, with the top and bottom squares filled in. 9 squares in a column, with the top and bottom squares filled in. 9 squares in a row, with all squares filled in
The picture that can be encoded by the pattern 000010000 is
9 squares in 3 rows and 3 columns, with only the center square filled in.
What is a pattern in math?A pattern in mathematics is a series of recurring figures, shapes, or numbers. Any kind of event or thing can be connected to a pattern.
A pattern has a rule that identifies the items that are part of the pattern and those that are not.
How to encode the patternThe pattern representing blank and filled can be encoded as follows
let 0 represents blank and 1 represent fill
The pattern 000010000 can be rewritten as
0 0 0
0 1 0
0 0 0
The represents 3 rows and 3 columns where all are blanks except the center is filled in
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What tends to happen to a sound wave as air temperature increases? O A. The wave's speed increases. B. The wave vibrates more slowly. C. The wave stands still. D. The wave's speed decreases.
WHAT IS THE CHEMICAL FORMULA FOR inorganic benzene
Answer: B3N3H6
Explanation:
I am pretty sure the formula for benzene is B3N3H6. If I am wrong, I am sorry, I learned this a long time ago.
When the balloon is released, air is pushed out by the balloon. Which other force is acting that demonstrates Newton's third law of motion?
The released air produces an equal force in the opposite direction of the motion of the air, which causes the balloon to move forward in accordance with Newton's Third Law of Motion.
What forces are at play when you release the balloon?As the balloon climbs, friction develops between the moving balloon and the air molecules it encounters. In opposition to the lift, drag and gravity's pull on the balloon's mass both exert downward forces. The balloon rises if the lift is greater than the drag and gravity's pull. One component of the force pair is the force of the balloon on the air, and the other component is the force of the air on the balloon.
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which type of building material can produce toxic gases and rapidly deteriorate under fire conditions?
Engineered wood products type of building material can be highly combustible and produce toxic gases when exposed to fire.
Its construction materials exhibit a variety of flaws and stone degradation patterns, including color fading, spalling, and flaking.
Materials comprised of wood fibers connected by glue or binders may be extremely flammable, release hazardous fumes, or degrade quickly when exposed to fire. Building firewalls involves using walls.
In North America, wood is the most widely used building material and the foundation of many different structural systems. Wood's response to fire conditions is influenced by its size and moisture content.
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what mass of sodium phosphate is required to prepare 250.0 ml of a solution that is 0.30 m in sodium ion?
4.1g of sodium phosphate is required to prepare 250.0 ml of a solution that is 0.30 m in sodium ion.
The important thing to note here is that each mole of trisodium phosphate ([tex]Na_{3}PO_{4}[/tex]) gives us 3 moles of Na ions. So a solution that is 0.30 M in sodium ion is only 0.10 M in [tex]Na_{3}PO_{4}[/tex].
Now, molarity is moles/L, so we can figure out the total number of moles we need:
0.10 mol/L × 0.250 L = 0.025 moles [tex]Na_{3}PO_{4}[/tex].
Finally, the MW of [tex]Na_{3}PO_{4}[/tex] = 164 g/mol.
So: 0.025 moles × 164 g/mol = 4.1 g
So you would need 4.1 g of trisodium phosphate to make 250 mL of this solution.
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ans fast plss i have due in 2 hours
refer the pic above for answer
A 0. 0733 L balloon contains 0. 00230 mol of L, vapor at a pressure of 0. 924 atm.
What is the temperature, in Kelvin, of the I in the balloon?
Express the answer using 3 significant figures.
A 0.0733L balloon contains 0.00230 mol at a pressure of 0.924 atm.
V=0.0733 L
n=0.00230
P=0.924 atm
From the ideal gas law:
T=PV/nR
T= 359.12K
What is the ideal gas law?
The right fuel law, additionally known as the general gasoline equation, is an equation of the state of a hypothetical perfect gasoline. Despite the fact that the best gasoline law has numerous barriers, it is a superb approximation of the behavior of many gases underneath many situations. Benoit Paul Émile Clapeyron stated an appropriate gasoline regulation in 1834 as a combination of the empirical Charles’s regulation, Boyle’s regulation, Avogadro’s regulation, and gay-Lussac’s regulation.The perfect gas law states that the made of the strain and the volume of 1 gram molecule of a really perfect gasoline is the same to the fabricated from the absolute temperature of the gas and the prevalent gasoline consistent.To know more about the ideal gas law, click the link given below:
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