Answer: Though a hydrogen atom has only one electron, it contains a large number of shells, so when this single electron jumps from one shell to another, a photon is emitted, and the energy difference of the shells causes different wavelengths to be released... hence, mono-electronic hydrogen has many spectral lines.
Explanation: sry its late
Answer: Your welcome!
Explanation:
The frequency of a line in the hydrogen spectrum is determined by the difference in energy between two energy levels in the hydrogen atom. The energy levels are determined by the electron's angular momentum and can be expressed as the quantum number n. The energy of the lines is then determined by the difference between two energy levels (n1 and n2) and is given by the equation ΔE = hc/λ = (R/n2^2) - (R/n1^2), where R is the Rydberg constant and h is Planck's constant. The frequency of the line is then determined by the equation ν = ΔE/h.
Suppose the United States adopted the international standard for
letter-sized paper. Explain at least two things that might result from this change
Answer:
. In the United States, a standard letter-sized piece of paper is 8.5 inches wide by 11 inches long. The international standard for a letter-sized piece of paper is different. The international standard is based on SI units: 21.0 cm wide by 29.7 cm long. a. Convert 21.0 cm to inches. Show your dimensional analysis setup. b. Convert 29.7 cm to inches. Show your dimensional analysis setup. c. State the dimensions, in inches, of the international standard for a letter-sized piece of paper. d. Which piece of paper is longer: a U.S. letter-sized piece of paper, or an international letter-sized piece of paper? e. Suppose the United States adopted the international standard for letter-sized paper. Explain at least two things that might result from this change
a container filled with 45 kg of liquid water at 95°c is placed in a 90-m3 room that is initially at 12°c. thermal equilibrium is established after a while as a result of heat transfer between the water and the air in the room. using constant specific heats, determine (a) the final equilibrium temperature, (b) the amount of heat transfer between the water and the air in the room, and (c) the entropy generation. assume the room is well sealed and heavily insulated.
Thermal equilibrium is established after a while as a result of heat transfer between the water and the air in the room.
Option B is correct
What is Thermal equilibrium?
If there is no net transfer of thermal energy when two physical systems are connected by a heat-permeable route, then they are in thermal equilibrium. Thermal equilibrium is in accordance with the first law of thermodynamics.
When a system's internal temperature is both uniformly distributed and stable over time, it is considered to be in thermal equilibrium with itself. Systems that are in thermal equilibrium are always in systems that are in thermodynamic equilibrium, while the reverse is not always true.
The two systems may reach thermal equilibrium without achieving thermodynamic equilibrium if the connection between them allows the transfer of energy as a "change in internal energy" but not the transfer of matter or energy as work.
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To make pizza dough, luca mixes 50 ml of milk for every 250 ml of flour. how many ml of milk does he mix with 750 ml of flour?
To make pizza dough, Luca combines 50 ml of milk for every 250 ml of flour. 150 ml of milk does combine with 750 ml of flour.
calculation :
[tex]\frac{50}{250}[/tex] × 750
= 150 ml
Is pizza dough just bread dough?
The distinction between Pizza and Bread dough is Pizza dough is made with a more elevated protein flour other than that they both use the exact ingredients, yeast, flour, salt, and water. Let the dough grow before freezing, then split the dough into your preferred pizza portions, put it in airtight freezer bags and freeze.
Pizza dough is made up with five basic ingredients flour, salt, yeast, oil, and water.
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Relative conductance is the ability of a specific conductor to carry electrons as compared to the ability of a(n) ___ conductor to carry electrons.
Relative conductance is the ability of a specific conductor to carry electrons as compared to the ability of a copper conductor to carry electrons.
The relative conductance (g'X) of a given ionic species is the conductance for that single ion divided by the total conductance for all of the ionic species (i.e., g'X = gX/g Total). The flow of free electrons in the form of an electric current is referred to as conduction. The inverse of resistivity is conductivity. That is 1/ and has a siemens per meter, or S/m, value. From zero (for a perfect insulator) to infinity, conductivity is possible (for a perfect conductor). A super conductor has nearly no ohmic resistance and limitless conductance
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15) CCC Patterns Changes in the state of matter (solid, liquid, gas) are
the result of different energy levels at the molecular level. Look
at the graph of the energy required to go from water ice to water
vapor. Describe the energy of the water molecules for each state.
The thermal energy of solid state is the least and the thermal energy for gaseous state is maximum.
Any substance that is present around us exists in three states i.e, solid, liquid and gas.
The two major factors that affect the state of the substance are thermal energy and intermolecular interactions. These factors are shown in the adjoining image.
When energy in the form of heat is provided to ice, it first converts into liquid water and finally into steam. This conversion has been shown in the graph present in the adjoining diagram.
As energy is added to it, the solid state has the lowest energy, the energy of the liquid state is more than the solid state and the maximum energy is of gaseous state.
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If solutions of ba(oh)2 and feso4 are mixed, how many precipitation reactions will occur?
2 precipitation reactions will occur.
A "chemical reaction occurring in an aqueous solution when two ionic bonds combine, yielding the creation of an insoluble salt" is what is meant by the term "precipitation reaction." Precipitates are the insoluble salts created during precipitation reactions. Precipitation reactions are often double displacement events that result in the formation of the precipitate, a solid form of residue.
The creation of insoluble salts that precipitate out of the solution results from these reactions when two or more solutions with various salt concentrations are mixed. The chemical reaction between potassium chloride and silver nitrate, in which solid silver chloride is precipitated out, is one of the greatest examples of precipitation reactions. This is the precipitation reaction's byproduct, the insoluble salt.
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Chemists use the letters of the alphabet as what for the elements?
Answer:
As a Symbol
Explanation:
How many moles of sucrose (m = 342.3 g/mol) are there in 25 ml of a 0.551 g/l solution of sucrose?
Molarity of sucrose = 0.116 M .
Volume of solution = 0.5 liter
Mass of sucrose in gram = 20 gram
Molar mass of sucrose 342.3 g/mol
Molarity of sucrose
Computation:
Mole of sucrose = Mass of sucrose in gram / Molar mass of sucrose
Mole of sucrose = 20 / 342.3
Mole of sucrose = 0.058 (Approx.)
Molarity of sucrose = Mole of sucrose / Volume of solution
Molarity of sucrose = 0.058 / 0.5
Molarity of sucrose = 0.116 M
What is Molarity ?A substance's molarity (M) is the volume of solution in which it is present. The amount of a solute in moles per liter of a solution is known as molarity. A solution's molar concentration is another name for molarity.
The amount of solute in one mole per liter of solution is known as molarity. For instance, when table salt is dissolved in water, the solute is salt, and the solution is water. 58.44 grams make up one mole of sodium chloride. One molar solution, often known as 1M, is created when 58.44 grams of sodium chloride are dissolved in one liter of water.
The quantity of solute in one mole of solution per liter is known as molarity.
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The chemical formula for octane is: ch3ch26ch3 calculate the molar mass of octane. round your answer to 1 decimal place.
The chemical formula for octane is: ch3ch26ch3 114073 is the molar mass of octane.
What is molar mass ?The molar mass of a chemical compound is determined in chemistry by dividing the mass of a sample of that compound by the quantity of that compound, which is the number of moles in that sample, measured in moles. A substance's molar mass is a bulk attribute rather than a molecular one. The compound's molar mass is an average over multiple samples, each of which will likely have a different mass because of the existence of isotopes.
The molar mass is most frequently calculated from the standard atomic weights, making it a terrestrial average and a function of the relative abundance of the constituent atoms' isotopes on Earth. The molar mass is suitable for converting between a substance's mass and a quantity.
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How much carbon (C) is in 1.41 × 10^22 atoms
of carbon?
Answer in units of mol.
Taking into account the definition of Avogadro's Number, 0.02341 moles of carbon are 1.41×10²² atoms of carbon.
Avogadro's NumberAvogadro's Number is called the number of particles that make up a substance (usually atoms or molecules) and that can be found in the amount of one mole of said substance. Its value is 6.023×10²³ particles per mole. Avogadro's number applies to any substance.
Amount of moles of carbonYou can apply the following rule of three: if 6.023×10²³ atoms are contained in 1 mole of carbon, then 1.41×10²² atoms are contained in how many moles of carbon?
amount of moles of carbon= (1.41×10²² atoms × 1 mole)÷ 6.023×10²³ atoms
amount of moles of carbon= 0.02341 moles
Finally, 0.02341 moles of carbon are 1.41×10²² atoms of carbon.
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a sample of oxygen gas that occupies 0.679 m3 exerts a pressure of 36 kpa at a temperature of 293 k (absolute temperature measured on the kelvin scale). find the value of k (in kpa · m3) in the given model.
The value of k is 24.44 kPa[tex]m^{3}[/tex] using the given model of pressure and volume .
Given data,
P= 36kPa
V = 0.679[tex]m^{3}[/tex]
According to the given model,
P = k/V
where, P = pressure in kPa
V = volume occupied by gas
k = proportionality constant
Plugging in the values in the respective model we get,
P = k/V
36 = k/0.679
k = 24.44 kPa[tex]m^{3}[/tex]
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How much electrical energy is converted to light and thermal energy by a 130 w light bulb in one day?
468 KJ of electrical energy is converted to light and thermal energy by a 130 w light bulb in one day.
Define Electrical energyElectrical energy is produced when electrically charged particles move, producing energy. Electrical energy is a general term that describes the energy that has been transformed from electric potential energy. Electric current and electric potential are given by an electrical circuit that serves as the source of this energy (e.g., provided by an electric power utility). This electric potential energy stops being electric potential energy after it has been changed into another form of energy.
P = 130W is the lightbulb's power.
Within an hour, we must locate the electrical energy that the lightbulb generated. We are aware that the amount of electrical energy generated per unit of time is what provides electricity.
1 hour equals 3600 seconds.
p=E/T
E= p * T
E= 130 * 3600
E= 468000 joule
E = 468 kJ
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What is the best choice of reagent to perform the following transformation?.
a. h2o
b. h2so4
c. naoch3
d. kotbu
the best choice of reagent to perform the following transformation is H₂O and H₂SO₄
What is reagent with example?
In chemistry , the term "reagent" denotes a chemical ingredient, this will also be stated as an "Orko". this is often typically found in a compound. (a compound or mixture, typically of inorganic or small organic molecules) introduced to cause the specified transformation of an organic substance.Reagents could also be compounds or mixtures. In chemistry , most are small organic molecules or inorganic compounds.
What is difference between reagent and reactant?Reactant: Reactants are the starting materials that undergo changes during a reaction .
Reagent: Reagents are the compounds that are added to a system so as to cause a chemical reaction.
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questionyou heat two substances, a and b. both substances change color. when cooled, both substances return to their original colors.what most likely happened in this situation?
Two substances, a and b were heated. Both substances change color. when cooled, both substances return to their original colors.
What is a physical change?
A physical alteration only affects the object's shape; the object's interior structure (its molecules) remain unaltered. It is possible to change the created element back into the original thing. A alteration that can be undone is reversible. The condition, shape, or size of an object can change due to a physical change.
Here, since after heating both the substances a and b change colour and again on cooling return back to their original form (previous colour), thus we can conclude that a physical change occurs in them on heating which reverts back on cooling, being a reversible process.
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Coach is used to activate carboxylic acids. what type of compound is formed between coach and a carboxylic acid?
The type of compound is formed between coach and a carboxylic acid alcohol + carboxylic acid → ester + water.
How carboxylic acids are formed?
A acid is produced after the acidic hydrolysis of esters and carboxylates are produced after the basic hydrolysis of an ester.
What are the functional group of alcohol and carboxylic acid?
Alcohols contain the hydroxyl functional group and may be primary, secondary, or tertiary. Ethers are compounds with an oxygen atom bonded to 2 alkyl groups. Aldehydes and ketones contain the carbonyl functional group
Can a compound be a acid and an alcohol?
Esters are represented by the formula RCOOR', where R and R' are hydrocarbon groups. The ester, which is compound derived from a carboxylic acid and an alcohol in which the OH of the acid is replaced by an OR group, looks somewhat sort of a n ether and also somewhat like a carboxylic acid.
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"4s2 is the amount of energy in the atom"
Using the terms energy level, sub level, number of electrons explain WHY this misconception is incorrect and what "4", "s" and "2" represent in electron configurations.
The shell is spherically symmetrical orbital and two electrons are found in the N shell of the atom.
What is electron configurations?The electron configuration is defined as the manner in which the electrons are arranged in an atom. The electron present in an atom are arranged in subshells and shells. The shells are choose according to the principal quantum number in which the subshells are taken by the orbital quantum number.
The orbital in which the electron is found has a direct relation to the energy of the electron.
Thus, we concluded that the "4s^2" refers that it is spherically symmetrical orbital and the two electrons are found in the N shell of the atom.
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if you have a properly adjusted flame, which is pale blue, what is observed if the gas control valve is slightly closed
When there is less natural gas, a luminous flame will appear.
A luminous flame is one that produces more light from a fuel source with inefficient combustion. In other words, there is not enough oxygen available for stoichiometric combustion when combustion occurs. For more effective combustion, this emits light that is more in the yellow-orange range of the visible light spectrum as opposed to a more blue-nearly colorless region.
An acetylene torch is a good illustration of luminous falme because the first ignition is normally carried out in the presence of only acetylene, which produces a very sooty, bright, yellowish-red flame. The flame receives more of the necessary oxygen for effective combustion when the oxygen valve is opened, and the flame changes color to blue.
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Which term best describes salt water made by combining table salt with pure water
Answer: "homogenous mixture." out of these 2
brine, salt water, particularly a highly concentrated water solution of common salt (sodium chloride).
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the equilibrium of 2h 2 o(g) 2h 2 (g) o 2 (g) at 2,000 k has a k eq value of 5.31 x 10 -10 . what is the mass action expression for this system?
The mass expression for the system is K= (aH₂)² × aO₂ / (aH₂O)² = 5.31× 10⁻¹⁰.
First, we have to write a balanced chemical equation, i.e
2H₂O(g) ⇄2H₂(g)+O₂(g)
Now, from the above equation we can write mass action expression,
K= (aH₂)² × aO₂ / (aH₂O)² = 5.31× 10⁻¹⁰.
The mass action law provides simple method to write the expression for the equilibrium constant of any reaction. it is a universal law and applicable to all chemical reactions.
The ratio of the concentrations of the reactants and products is known as Equillibrium constant. It is represented as (K).
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HELP ME FLOCABULARY
help me please
Answer:
a
Explanation:
potential energy is something that could happen but haven't yet
Igneous rock is where new rock is formed from molten
Answer:
Igneous rocks (from the Latin word for fire) form when hot, molten rock crystallizes and solidifies. The melt originates deep within the Earth near active plate boundaries or hot spots, then rises toward the surface.
Explanation:
A huge candy bar measures 35.6cm long, 3.8cm tall, and 4.2cm wide. The bar has a total Mass of 633.6
grams, including a delicious 198 grams of fat!
Calculate the Density of this wonder of the chocolate.
The density of the chocolate, given the data is 11.15 g/cm³
What is density?The density of a substance is simply defined as the mass of the subtance per unit volume of the substance. Mathematically, it can be expressed as
Density = mass / volume
How to determine the density of the chocolateThe following data were obtained from the question:
Dimension = 35.6 cm × 3.8 cm × 4.2 cmVolume = dimension = 35.6 cm × 3.8 cm × 4.2 cm = 568.176 cm³Total mass = 633.6 gDensity of chocolate =?The density of the chocolate can be obtained as follow:
Density = mass / volume
Density of chocolate = 633.6 / 568.176
Density of chocolate = 11.15 g/cm³
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The binding and release of sodium or potassium ions are due to conformational changes in the protein. True or false?.
true, I'm not 100% sure if it's true though
The renal control mechanism of restoring the acid-base balance is accomplished through which process?
Re absorption of H[tex]CO_{3}[/tex] and excretion of H+ restores acid-base balance through the renal control mechanisms.
What is renal mechanism?
The renal system consists of the kidney, ureters, and therefore the urethra. the general function of the system filters approximately 200 liters of fluid a day from renal blood flow which allows for toxins, metabolic waste products, and excess ion to be excreted while keeping essential substances within the blood
Why is renal function important?
Renal function is important for homeostasis. The kidneys play important pleiotropic roles including removal of metabolic waste products and maintenance of water–electrolyte balance and vital sign . Early diagnosis of renal dysfunction and institution of appropriate therapy are vital to survival.
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failure to mix a specimen containing an anticoagulant by inverting the sealed specimen container several times after collection of the specimen
Failure to mix a specimen containing an anticoagulant by inverting the sealed specimen container several times after collection of the specimen is due to the clots in specimen.
Clots in specimen or clotted specimen refers to an abruptly clotted blood specimen in which clotting occurs in that tube which contains anticoagulant. A specimen is clotted when the anticoagulant in the tube is not adequately mixed.
To mix and ensure adequate anticoagulation of the specimen, tube filled with the blood has to be inverted 8 - 10 times immediately, so that clots in specimen do not occur.
Specimen is supposed to be mixed immediately to ensure that anticoagulant in the tube has been fully dissolved with the specimen, which in return maintains the effective anticoagulant-to-specimen ratio and provides a specimen free from any clots.
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According to the law of multiple proportions, if 12 g of carbon combine with 16 g of oxygen to form co, the number of grams of carbon that combine with 16 g of oxygen in the formation of co2 is ________.
The weight of carbon that combines with 16 g of oxygen in the formation of CO2 is 12 g.
The law of multiple proportions was given by Dalton in 1803.
According to this law, when two elements combine to form more than one compound, the masses of one element that combine with a fixed amount of another element, are in the ratio of whole numbers.
For example,
hydrogen combines with oxygen to produce two compounds, water(H₂O) and hydrogen peroxide(H₂O₂).
Hydrogen + Oxygen ⇒ Water
2 g 16 g 18 g
Hydrogen + Oxygen ⇒ Hydrogen Peroxide
2g 32 g 34 g
Similarly, carbon also reacts with oxygen to form two different compounds, carbon dioxide(CO₂) and carbon monoxide(CO).
Carbon + Oxygen ⇒ Carbon Dioxide
12 g 32 g 44 g
Carbon+ Oxygen ⇒ Carbon Monoxide
12 g 16 g 28 g
Thus, the weight of carbon that combines with 16 g of oxygen in the formation of CO₂ is 12 g.
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question 3 a reaction equation, shown below, consumes 5.0 g of a and 6.0 g of b. how many total grams of c and d should be obtained? 1 a 3 b → 2 c 4 d
5.0 g of a and 6.0 g of b will obtain 11g of c and d, according to the law of conservation of mass.
What is law of conservation of mass?
The law of conservation of mass, also known as the principle of mass conservation, states that for any system closed to all transfers of matter and energy, the system's mass must remain constant over time because the mass of the system cannot change, meaning that neither more nor less can be added or taken away.
This law states that regardless of the physical or chemical change, the total mass of the products and the total mass of the reactants stay the same. Also referred to as the "law of indestructibility of matter," the law of conservation of mass.
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What type(s) of bonding would be expected for each of the following materials: brass (a copper-zinc alloy), epoxy, barium sulfide (bas), solid xenon, bronze, nylon, and aluminum phosphide (alp)?
The bonding expected for each material is covalent ,ionic and metallic bonds .
About bonds :
The force of attraction that leads to holding of atoms or ions together in a molecule or crystal is said be bonding. Bond formation can happen by either attraction or transfer of electrons. There are single, double, and triple bonds. There are many sorts of bonding namely:
Covalent (sharing of electrons takes place).
Ionic (transfer of electrons takes place)
Metallic (ionized atoms of metals and therefore the sea of electrons around them).
Brass (a copper-zinc alloy)
Brass is an alloy of metal that's copper and zinc. Hence, the metallic bonding is present within the brass.
Rubber
It is a polymer whose monomer unit is isoprene, which may be a covalent compound. The isoprene units are attached in repeated units to make rubber by covalent bonding.
Barium sulfide ()
Due to the large electronegativity difference between barium and sulfur, barium sulfide is an ionic compound. Thus, ionic bonding is present in barium sulfide.
Solid xenon
Only xenon atoms are present in solid xenon which are interacted by weak Van der Waal's interactions.
Bronze
Bronze is an alloy of metal that's copper and tin. Hence, the metallic bonding is present within the brass.
Nylon
It is a polymer whose monomer unit is caprolactam, which may be a covalent compound. The caprolactam units are attached in repeated units to make nylon by covalent bonding.
Aluminum phosphide ()
Aluminum phosphide may be a covalent compound and thus involves covalent bonding.
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Consider a 0.5 l buffer that contains 0.12 m hocl and 0.080 m kocl. what is the ph of this buffer after adding 2.5 ml of 10m koh to the solution. (ka (hocl) = 3.5 x 10-8)
The pH of this buffer after adding 2.5 ml of 10m KOH to the solution is 7.73
What is the pH of this buffer after adding 2.5 ml of 10m KOH to the solution?The HOCl/KOCl buffer has a pKa of 7.46. We can use the H-H equation to determine the pH of this buffer:
[tex]pH = log\frac{ [A^{-} ] }{[HA]} + pKa[/tex]
[tex]pH = 7.46 + log\frac{[KOCl] }{ [HOCl]}[/tex]
Where [] represents the molarity (or moles) of each compound.
Initial HClO and NaClO moles:
HOCl :-0.500L * (0.12mol / L) = 0.06 moles HOCl
KOCl:- 0.500L * (0.080mol / L) =0.04 moles KOCl
HOCl now reacts with KOH to form KOCl:
[tex]HOCl + KOH[/tex]→ [tex]KOCl[/tex] + [tex]H_{2} O[/tex]
The moles of KOH in the reaction are as follows:
[tex]2.5x10^{-3} L * (10mol/L)=0.025 moles KOH[/tex]
That is, 0.025 moles of HOCl are consumed and 0.025 moles of KOCl are produced after the reaction.
Following the reaction, moles are:
The final moles:
HOCl:- 0.06mol - 0.025mol = 0.035mol HOCl
KOCl :-0.04mol + 0.025mol = 0.065mol KOCl
Replacing in the H-H equation:
[tex]pH = 7.46 + log\frac{ [0.065mol] }{ [0.035mol]}[/tex]
pH = 7.73
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What would be a rocket’s acceleration [a = (End velocity - Start velocity) / time] in space if it fires its engines and starts moving from 1000 m/s to 2500 m/s in 10 seconds?
The acceleration of the rocket would be 150 m/s^2.
Initial velocity, u=1000 m/s
Final velocity, v=2500 m/s
Time taken, t=10 seconds.
According to equation of motion,
v=u+at
2500=1000+10a
2500-1000=10a
1500=10a
a=150 m/s^2.
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