According to Bohr's model, electron emit electromagnetic radiation when an electron moves from the higher energy orbit to the lower energy orbit of an atom.
Niels Bohr (1885–1962) proposed a model for the hydrogen atom that explained its atomic emission spectrum.
According to the Bohr model of the atom:
1. Energy levels of electrons are discrete (certain discrete values of energy), that is why hydrogen shows discrete, bright, colored lines.
2. Electrons orbit the nucleus in orbits that have a set size and energy.
3. Electrons can jump from one energy level to another, absorbing or emitting electromagnetic radiation with a frequency ν (energy difference of the levels).
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one isotope of tellurium, tellurium-123, has seventy one neutrons. what must tellurium's atomic number be?
The atomic number of an isotope of tellurium that has 71 neutrons is 52.
What is atomic number?The atomic number of an element is the number of protons in an atom of that element.
The number of protons in an atom can be got by subtracting the mass number of an element from the number of neutrons.
According to this question, one isotope of tellurium, tellurium-123, has 71 neutrons. The atomic number or proton number can be calculated thus;
atomic number = 123 - 71
atomic number = 52
Therefore, the atomic number of an isotope of tellurium that has 71 neutrons is 52.
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Answer:
Explanation:l do not no the answer
What multiplicity would you expect in a 1h nmr spectrum for the indicated proton(s)? (1 pts)
Triplet multiplicity would expect in a 1h NMR spectrum for the indicated proton(s).
The spectrum is the invisible radio frequencies that radio signals pass through. These signals let you make phone calls from your mobile device, tag your friends on call an Uber, and get directions to your destination, all from your mobile device.
Spectrum management is the art and science of managing the use of the radio spectrum to minimize interference and ensure that the radio spectrum is used in the most efficient manner possible for the public good. For USDOT, this focuses on supporting safe, efficient, and economical transportation. Spectrum Networks is a suite of news and sports networks owned and operated by Charter Communications, Inc.
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An atom has 13 protons, 12 neutrons and 13 electrons in an atom. it loses 2 electrons to form an ion. find the number of protons, and electrons in the ion. also, find the charge of the ion.
(Tell as soon as possible) *Thank you *
Answer:
If there are 13 protons (positive charges), how many electrons are there in a neutral atom? Expert Answer 1)) given total number of protons =13 and electron =12 . For atom to be neutral total number of protons should be equal to total number of electrons.
Explanation:
What is thermodynamics?
a. the study of electric fields
b. the study of organic matter
c. the study of the nucleus
d. the study of heat flow
answer:
d. the study of heat flow.
explanation:
thermodynamics is the study of the relations between heat, work, temperature, and energy.
How many significant figures are in each measurement?
a.
b. 143 kg
c. 8.75 x 10 -2 g
d. 0.074 m
e. 1.072 cm
f. 0.05730 m
g. 8765 L
h. 11 soccer players
i. 40.007 m
Answer:
Explanation:
b. 3 sig figs
c. 3 sig figs
d. 2 sig fig
e. 4 sig fig
f. 4 sig fig
g. 4 sig fig
h. 2 sig fig
i. 5sig fig
1. The motion of an object is described as 240 mph to the northeast. What form of
motion is being described?
a. Speed
b. Velocity
c. Acceleration
d. None of the above
The form of motion which is described is velocity as it is describing the speed as well as the direction.
What is motion?Motion is defined as a phenomenon which is described with respect to change in object's position with respect to time.It is given in terms of displacement,velocity,distance ,acceleration,speed.
Branch of physics which deals with motion of objects without any reference to it's cause is called kinematics while the branch which studies forces and their effects on motion is called as dynamics.
Motion applies to various systems like objects,bodies, matter particles ,radiation ,curvature.There are three laws of motion which are proposed by Newton.Classical mechanics is based on Newton's law of motion.Relativistic mechanics is based on modern kinematics.
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In which the following cases is pressure a factor in the solubility of the solute in the solvent? a. alcohol is dissolved in water b. carbon dioxide is dissolved in sparking wine c. sugar is dissolved in water d. acetylene gas is mixed with oxygen in a blowtorch
Answer: a
Explanation:
What is the atomic number for an element whose mass number is 78, which contains 36 neutrons per atom?
25.0 ml is taken from a stock solution of concentration 14.9 g/l and added to a 250.0 ml volumetric flask and diluted up to the calibration mark. what is the new concentration (in grams per liter)?
If 25.0 ml is taken from a stock solution and added to volumetric flask and diluted up to the calibration mark, then the new concentration will be 1.49 g/L.
Now, Concentration of solution is defined as amount of solute present in specific volume of the solution.
Molarity (M) = moles of solute ÷ litres of solution
Here, the concentration of solution is given as, 14.9 g/l
and, the volume of solution is 25.0 ml= 0.025 l
using the equation,
14.9 = moles of solute ÷0.025
moles of solute = 0.3725 moles
0.025 l is added to a 0.25 l (250.0 ml =0.25 l) volumetric flask and diluted up to the calibration mark.
Since,
volume of solution = volume of flask
And, moles of solute remains the same.
Therefore,
The new concentration is,
concentration = (0.3725 ÷ 0.25) g/l
New concentration = 1.49 g/l
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Which is true?
Oxygen is negative and hydrogen is positive.
Oxygen is negative and hydrogen is negative.
Oxygen is positive and hydrogen is positive.
Oxygen is positive and hydrogen is negative.
The statement oxygen is negative and hydrogen is positive is true.
How to determine charge on an element?
Charge on an element is determined by the position of an element in the periodic table.More precisely,it is determined by an element's electronic configuration.
Elements having one electron in their outermost or valence shell are situated to the left of the periodic table and are positive as they loose their one electron present in valence shell to form cations that are positively charged ions.
Elements having six or seven electrons in their valence shell tend to gain one or two electrons respectively to complete their octet.These elements form anions that are negatively charged ions.
Hydrogen with atomic number 1 has 1 electron in it's valence shell which it looses to acquire a positive charge and hence form a cation .
Oxygen on the other hand,with atomic number 8 has 6 electrons in it's valence shell and thus gains 2 more electrons to complete the octet,and hence gain a negative charge and form an anion.
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Find the volume of a liquid if 32.5 g of the liquid has a density of 0.852 g/mL.
Answer: 27.69 mL^3
Explanation:
32.5 g * 0.852 g/mL=
32.5*0.852=27.69 mL^3 ==>Volume is expressed in units cubed.
The binder found in high-fiber foods that inhibits the absorption of iron and zinc is?
The binder found in high-fiber foods that inhibits the absorption of iron and zinc is oxalic acid Choose raw fruits and vegetables instead of juice, and consume the peels. Alternative fiber sources include whole buckwheat, whole wheat couscous, quinoa, bulgur, wheat germ, chia water seeds, hemp seeds, lentil pasta, and edamame pasta.
Popcorn is a complete grain. Serve it low-fat and without butter for a healthy snack option. It is a white crystalline substance that dissolves colorlessly in water. It got its name from the fact that early researchers obtained oxalic acid from blooming plants of the genus Oxalis, sometimes known as wood-sorrels.
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What is the correct symbol for an ion containing 24 protons, 27 neutrons, and 21 electrons?
The appropriate designation for an ion with 24 protons, 27 neutrons, and 21 electrons is [^51 Cr24].
How to represent an atom with atomic number and mass?
The smallest component of ordinary stuff that makes up a chemical element is an atom. Each neutral or ionized atom makes up a solid, liquid, gas, or type of plasma. Atoms are very small, with an average diameter of 100 picometers.
Symbolical representation is :
[ Xz^A] or [^A Xz]
Where,
A = Mass , X = atom, Z = Atomic number.
The quantity of protons and neutrons in an atom's nucleus is referred to as its mass number.
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Hydrogen and helium, the two main constituents of the sun, are both ______ elements.
The two main constituents of the sun, are both lightweight elements.
What is constituents of the sun?Helium and hydrogen make up the majority of the sun's mass (He). The sun is made up of 92.1% hydrogen and 7.9% helium by mass. Less than 0.1 percent of the mass of the sun is made up of different metals. The surface of the sun is around 10,340 degrees Fahrenheit hot (5,726 degrees Celsius).
The majority of the sun's emissions come from particles like neutrinos that travel beyond the light the sun's surface emits and can't be seen with ordinary spectroscopic instruments. As a result, to identify these particles, specialised equipment were needed, such as the Super Kamiokande (Kamioka Observatory, Japan), which has incredibly sensitive light sensors. These particles provided evidence that nuclear fusion processes were taking place in the Sun's core, which is what caused their emission.
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chlorhexidine and alexidine are: group of answer choices used to treat local hypoplasia. used widely in metallic salts. used in mouthrinses and are effective against plaque formation. chemicals present in metallic dust, which industrial workers may inhale. used in prophylaxis jets.
Chlorhexidine and alexidine are: used in mouthrinses and are effective against plaque formation.
Chlorhexidine is a disinfectant and antiseptic. It is used for preventing dental plaque, treating yeast infections of the mouth and cleaning wounds.
Chlorhexidine interacts with components of toothpaste and forms salts of low solubility and antibacterial activity.
Alexidine is an antimicrobial agent, used in mouth washes as antiplaque cleaner. It is better for use than chlorhexidine because it is relatively non-toxic
Chlorhexidine and alexidine were synthesized in 1950s.
They inhibit a dental plaque formation by 70%.
Dental plaque is a biofilm of microorganisms that grows in the mouth.
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The anaerobic process of splitting glucose and forming two molecules of pyruvic acid.
The anaerobic process of splitting glucose and forming two molecules of pyruvic acid is called 'glycolysis.'
The word glycolysis means 'glucose splitting' and this is what happens throughout the process.
During glycolysis, enzymes are used to split one molecule of glucose into two molecules of pyruvate (pyruvic acid).
This process produces end products which include two molecules of ATP and two molecules of NADPH as well as water.
As this is an 'anaerobic process' which means it doesn't need oxygen for the process.
The process of glycolysis also takes place inside the cytoplasm and occurs in both aerobic and non-aerobic organisms.
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What is the immediate effect of hyperventilation (breathing too fast) on the co2co2 concentration in the blood?
The immediate effect of hyperventilation on the CO₂ concentration in the blood is low levels of carbon dioxide in the blood.
Low levels of carbon dioxise makes a person feel light- headed and increases heartbeat and results in shortness of breath.When hyperventilation occurs, the concentration of carbon dioxide decreases in the blood and the protonization of the blood also decreases. Therefore, the H + ions decrease in concentration, which results in the generation of metabolic alkalosis.Respiratory system collaborates by generating hypoventilation, to regulate the metabolic alkalosis. It is also regulated by various other systems. If you exhale more than you inhale, it results in the reduction in carbon dioxide in the body. Hyperventilation upsets the balance of gases as too much CO₂ is removed.If CO₂ levels in the blood drops, pH of the blood is altered resulting in the condition called alkalosis, which makes a person feel weak or faint.To learn more about hyperventilation,
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what are two ways that cmpounds ar differnent from the elements that form them
Answer: A compound contains atoms of different elements chemically combined together in a fixed ratio. An element is a pure chemical substance made of same type of atom. Compounds contain different elements in a fixed ratio arranged in a defined manner through chemical bonds. They contain only one type of molecule.
Explanation:
Given that water is the solvent for this type of experiment, what is the best site for tritium labeling?.
The best site for tritium labeling would not exchange the tritium ions for protons in water. All of the N−H sites (II−IV) would readily exchange tritium protons due to their lone pair-facilitating protonation and subsequent tritium exchange with water, but the C−H site (I), lacking a lone pair, would retain its tritium label.
Water is an inorganic, clear, tasteless, odorless, nearly colorless chemical substance that is the main component of the earth's hydrosphere and the fluid of all known living organisms. Although it provides no food, energy, or organic micronutrients, it is essential to all known forms of life.
There are three atoms in the water molecule. Two hydrogen atoms (H) and one oxygen atom (O). This is why water is sometimes called H2O. One drop of water contains billions of water molecules. Water is wet in the sense that it is a highly mobile liquid. This is because the molecules are fairly loosely bound and thus have low viscosity.
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Which feature is shared by all three-carbon monosaccharides?
The features are shared by all three-carbon monosaccharides, They are all pentoses. In their linear forms, they all contain carbon carboxyl and several hydroxyl functional groups. In their linear forms, they all contain a carbonyl and several hydroxyl functional groups.
Carbon is used in some form in almost every industry in the world. It is used as fuel in the form of coal, methane gas, and crude oil (used to make gasoline). It is used to make all sorts of materials, including plastics and alloys such as steel (a combination of carbon and iron).
Life on Earth cannot exist without carbon. This allows carbon to readily form bonds with other atoms, giving it flexibility in the forms and functions that biomolecules such as DNA and RNA can adopt, and is essential for growth and replication, the defining properties of life. This is partly due to
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A chemist experiments on a molecule with the formula of c5h10o5. this compound is likely a(n) ________.
A chemist experiments on a molecule with the formula of c5h10o5. this compound is likely a(n) carbohydrates.
A molecule with the formula C₅H₁₀O₅ is carbohydrates.
What are Carbohydrates?
The carbohydrates are represented through the chemical system Cₙ(H₂O)ₓ.C denotes carbon within the components with a few water molecules. hence, carbohydrates mean hydrated carbon as it has some water molecules attached.The ratio of carbon, hydrogen and oxygen in carbohydrates is 1:2:1.Glucose is the maximum plentiful and simple carbohydrate.Monosaccharides and polysaccharides are the 2 kinds of carbohydrates.Carbohydrates are biomolecules.they also offer electricity to living things through numerous meals like bread, and rice, and so forth.therefore the molecular method C₅H₁₀O₅ represents carbohydrates.
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Polypeptides are synthesized from amino acid building blocks. the condensation reaction between the growing polypeptide chain and the next amino acid to be added involves the loss of:_______
Answer:
a water molecule.
Explanation:
The two reacting groups are a carboxylixc acid group (-COOH) and an amine (-CNH2). The forms the peptide link (-C-CO-N-C) and a molecule of water is released (H2O).
Bam added 5.42 g of cscl to 35.31 ml of h2o. calculate the concentration of bam's solution in units of g solute/100 g solvent. mwcscl= 168.36 g/mol mwh2o= 18.015 g/mol density of water= 0.9975 g/ml
Bam's solution, 5.42 g of CsCl mixed with 35.31 ml of H2O, has a concentration of 15.3882 g CsCl/100 g H2O.
Concentration, in chemistry, is defined as the amount of solute in a particular amount of solvent or solution. Some of the most common ways to express concentration includes molarity, mass-to-mass and mass-to-volume.
To solve for the concentration of Bam's solution in g solute/100 g solvent, solve for the mass of the solvent first.
To solve for the mass of the solvent, use the density and volume:
mass solvent = density x volume
mass solvent = 0.9975 g/ml x 35.31 ml
mass solvent = 35.221725 g
Solving for the concentration of Bam's solution in g solute/100 g solvent, where the mass of the solute CsCl is 5.42 g:
concentration = mass solute/ 100 g solvent
concentration = 5.42 g/ (35.221725/100)
concentration = 15.38822985
concentration = 15.3882 g CsCl/100 g H2O
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based on the information above and periodic trends, which of the following is the best hypothesis regarding the oxide(s) formed by rb?
The best hypothesis regarding the oxide(s) formed by Rb: Rb will form only Rb₂O, Rb₂O₂ and RbO₂.
Rubidium electron configuration:
₃₇Rb 1s²2s²2p⁶3s²3p⁶3d¹⁰4s²4p⁶5s¹; one valence electron is 5s¹ orbital.
Alkaline metals (group 1), in this example rubidium, have lowest ionizations energy and easy remove valence electrons (one electron), they are most reactive metals.
Alkaline metals have oxidation number +1.
The alkaline metals react with oxygen to form different oxides.
Rubidium like other alkaline metals, form oxide, peroxide and superoxide.
Rb₂O is rubidium oxide, it is a yellow solid
Rb₂O₂ is rubidium peroxide, it is produced when rubidium stands in air
RbO₂ is rubidium superoxide, it is a black solid
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In the redox conversion of Cr(OH)4 to
CrO2, the oxidation number of Cr goes from
(-1, 0, +3) to (-2, +6, +8). Recall that the
oxidation number of oxygen is typically -2.
How many ionized amino groups will be found in the tripeptide ser-ala-lys at ph 7?
The four amino acids can come together in any way. 34 x 81 = 81 different combinations are conceivable.
What is ionized amino ?Aspartic acid and glutamic acid are the two examples where the side chain further contains a carboxylic acid group to the one adjacent to the amino group. When the pH is close to neutral (pH 7), these groups get ionised and manifest themselves as the carboxylate anion.
The concentration of H+ ions and acid strength increase in direct proportion to the degree of dissociation (or ionisation). As a result, the degree of an acid's dissociation or ionisation is directly related to the acidity of the acid (stronger acids have lower pH values).
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What are the approximate fractional concentrations of the follow- ing phosphate species at ph values of 0, 2, 4, 6, 8, 10, and 12?
a. h3po4
b. h po
c. po43
Polyprotic Acid : Acids that can mislay, and bases that can gather up, more than one H+ (e.g. diprotic H2A and triprotic H3A acids).
Ionization take place stepwise, and each and every step has its own Ka.
H3PO4 (aq) ⇌ H+ (aq) + H2PO4 - (aq) Ka1 = 7.2 x 10-3
H2PO4 - (aq) ⇌ H+ (aq) + HPO4 2- (aq) Ka2 = 6.3 x 10-8
HPO4 2- (aq) ⇌ H+ (aq) + PO4 3- (aq) Ka3 = 4.2 x 10-13
According to question
To decide the fractional concentrations of one and all species at assorted pH values, first write the Henderson-Hasselbalch equation for each and every dissociation reaction.
Formula of Henderson-Hasselbalch equation is :
pH = pKa + log10 ([A–]/[HA])
pH = pK1+log[H2PO^4-] / [H3PO4]
pH=pK2+log[ HPO^2-] / [H2PO^4-]
pH = pK3+log[PO^3- 4] / [HPO^2- 4]
a. Fraction of H3PO4: pH0 = 0.993; pH2 = 0.58; pH4 = 0.01 ; pH 6 is negligible.
b. Fraction of HPO4 ^2- : pH 0 is negligible and 0.06; pH8 = 0.86; pH10 = 1.0; pH12 = 0.72
c. Fraction of PO3 ^2- : negligible at any pH < 10 ; pH 12 = 0.28
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An aqueous solution contains 0.35 m ammonium nitrate. one liter of this solution could be converted into a buffer by the addition of:_________
Answer:
A strong base, such as NaOH. The amount of OH added shouldn't exceed 0.35 mols (though i would stop at 0.30 mols)
Explanation:
a weakly basic salt can be turned into a buffer by the addition of a strong base, and a weakly acidic salt can be turned into a buffer with a strong acid
Which transition metals usually form only one monatomic cation? select all that apply.
Zn, Cd, and Ag are transition metals that usually form only one monoatomic cation.
A monatomic cation is a cation made of only one atom.
Cations are positively charged ions, in this example Ag⁺, Cd²⁺ and Zn²⁺.
These cations form only one type of ion, while iron and copper form more than one type of cations.
Iron and copper form cations with different charges (Fe²⁺, Fe³⁺, Cu⁺, Cu²⁺).
It depends on electron configuration which type would be formed.
Electron configuration of zinc atom: ₃₀Zn 1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s²
Transition metals are elements in the d-block of the Periodic table.
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Why do we emphasize the valence electrons in an atom when discussing atomic properties?
We emphasize the valence electrons in an atom when discussing atomic properties, as they are most accessible to other atoms.
What are valence electrons?The valence electrons are the electrons that are present in the outer shell of the atoms. These electrons are free for making bonds with the electrons of other atoms.
Electrons are joined with other electrons to make a compound. These electrons are shared by or gained by other atoms.
Thus, when discussing atomic qualities, we focus on the valence electrons in an atom since they are the most receptive to other atoms.
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