The spectral line has been defined as the more or less number of photons in the spectrum that appears bright or dark. The electron jumping from n = 4 to 3 belongs to the Paschen series.
What is the Paschen series?The Paschen series is the Infrared (I.R) region that has a number of lines estimating from higher energy levels to n = 3 energy levels. If the electron jumps from n = 4 to n = 3 then they have wavelengths of 1875 nm.
This wavelength has been found to lie in the IR region that emits electrons from the atom of hydrogen. The electron tends to move from higher energy states to lower energy states.
Therefore, the electron transition belongs to the Paschen series.
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Potassium nitrate is used for a variety of applications, including fertilizer, rocket fuel, and fireworks. how many molecules of potassium nitrate are in a 25 g sample?
There are 1.5×10^23 molecules molecules of potassium nitrate are in a 25 g sample.
molecules of KNO3 = 25gKNO3 x 1mol/101.11gKNO3 x 6.022x10^23 molecules/1mol = 1.5 x 10^23 molecules.
Molecules are made up of one or more atoms. If they contain more than one atom, the atoms can be the same (an oxygen molecule has two oxygen atoms) or different (a water molecule has two hydrogen atoms and one oxygen atom). Biological molecules, such as proteins and DNA, can be made up of many thousands of atoms.
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Amino acids are built around a central ____________ atom bonded to a ____________ atom and three other groups of atoms.
Amino acids are built around a central Carbon atom bonded to a Hydrogen atom and three other groups of atoms.
Amino acids are molecules that are joined together in chains that combine to form proteins, and when these proteins are digested or broken down, the amino acids are used up.
Amino acids and proteins are essential for all living things, from microbes to humans. They make up approximately 50% of our solid body mass; they are the next largest component of our body after water.
They are classified into three groups:
Essential amino acidsNon-essential amino acidsConditional amino acidsWhat is an atom?The atom is the smallest part of the composition of matter, it is indivisible and is composed of a nucleus that has protons and neutrons, and around the nucleus there are the electrons.
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If you move from the equator to a location in the mid-latitudes, the wintertime average temperature will _____, and the temperature range will _____.
If you progress from the equator to a location within the mid-latitudes, the wintertime average temperature will decrease, and thus the temperature range will increases.
What is the relationship between latitude and temperature?
As latitude increases, the temperature falls, and therefore the other way around. Generally, round the world, it gets warmer towards the equator and cooler towards the poles.
However, other factors could influence the temperature in several locations like altitude, precipitation, and ocean currents
Why is it called latitude?
On a map where north is up, latitudes run laterally (left to right). they're named after the angle created by a line connecting the latitude and the center of the Earth, and therefore the line connecting the equator and the center of the Earth. Latitudes specify the north-south position of a location on the world .
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3. Which of the following statements about matter is FALSE?
O Matter can be classified as an element and a mixture.
O Matter is anything that occupies and has mass.
O Matter exhibits two types of change: physical and chemical.
O Mafter refers to everything that makes up the entire universe.
Matter can be classified as element and mixture is a false statement.
Physical and chemical qualities are present in all matter. Physical qualities, such as mass, color, and volume, are characteristics that may be measured by scientists without modifying the makeup of the sample being studied (the amount of space occupied by a sample). Chemical characteristics, such as flammability and susceptibility to corrosion, define a substance's distinctive capacity to reacted to generate new substances. A pure substance's chemical and physical properties are the same in all samples. For instance, pure copper always forms a solid that is reddish-brown in color and dissolves in diluted nitric acid to form a blue solution and a brown vapor (a chemical property).
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Name the phase change that occurs when a diamond film forms on a surface from gaseous carbon atoms in a vacuum?
Deposition, when a diamond film forms on a surface from gaseous carbon atoms in a vacuum, a gas changes directly into a solid.
What is deposition?Depositions typically take place in attorneys' offices rather than in courtrooms. A court reporter will record the entire deposition word-for-word while the lawyers interrogate the witness, or deponent, about details of the lawsuit and other events.
The reporter is present throughout the session and will create a transcript at a later time. A deposition could also be videotaped. This is typically done when the deponent is so very ill and may not be well enough for trial, or whether the deponent will be out of town or unavailable during trial.
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Gold is alloyed with other metals to increase its hardness in making jewelry. You have a piece of jewelry containing only gold and silver, which have pure densities of 19.3 g/cm³ and 10.5 g/cm³ respectively. You measure the piece of jewelry's volume to be 1.25 cm³ and its mass to be 20.5 g. Assuming the total volume of the jewelry is the sum of the volumes of the gold and silver it contains, what is the mass percent of gold in the piece?
The mass percent of gold in the piece is 79.08%
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
Thus,
Mass = density × volume
How to determine the mass of goldDensity of gold = 19.3 g/cm³Volume of gold = VMass of gold =?Mass = density × volume
Mass of gold = 19.3 × V
Mass of gold = 19.3V
How to determine the mass of silverDensity of silver = 10.5 g/cm³Total volume = 1.25 cm³Volume of gold = VVollume of silver = 1.25 - volume of gold = 1.25 - VMass of silver =?Mass = density × volume
Mass of silver = 10.5 × (1.25 - V)
Mass of silver = 13.125 - 10.5V
How to determine the volume of the goldMass of gold = 19.3VMass of silver = 13.125 - 10.5VTotal mass of piece = 20.5 gVolume of gold (V) =?Mass of piece = mass of gold + mass of silver
20.5 = 19.3V + 13.125 - 10.5V
Collect like terms
19.3V - 10.5V = 20.5 - 13.125
8.8V = 7.375
Divide both sides by 8.8
V = 7.375 / 8.8
Volume of gold = 0.84 cm³
Thus,
Mass of gold = 19.3V
Mass of gold = 19.3 × 0.84
Mass of gold = 16.212 g
How to determine mass percent of goldTotal mass of piece = 20.5 gMass of gold = 16.212 gMass percent of gold =?Mass percent of gold = (mass of gold / mass of piece) × 100
Mass percent of gold = (16.212 / 20.5) × 100
Mass percent of gold = 79.08%
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how are wavelength, frequency and energy related in an electromagnetic wave?
There are actually two models of electromagnetic radiation. One is the wave model, of course, and the other is the particle model, which postulates that radiation is made up of a stream of discretely sized particles called light quanta.
Different ideas about the energy connected to radiation are produced by the two theories.
The energy is stored in the EM fields that are moving through a region when the radiation is thought of in the wave model as an EM wave.
The wave oscillations in the wave model hold the energy.
Conceptually, the particle model differs slightly. Since each discrete particle in radiation has a specific amount of energy, the total energy of the radiant beam is determined by the number of discrete particles that make up the radiation.
In this scenario, the energy of each quantum is denoted by the formula E = h v, where h is Planck's constant.
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Write a balanced chemical equation for the reaction that occurs when dimethylether, ch3och3(g), is combusted in air.
The balanced chemical equation for the reaction occurs when dimethyl ether, ch3och3(g), is combusted in air.
CH3OCH3(g) + 3O2(g) ----> 2CO2(g) + 3H2O(l)
A chemical is a substance with a defined composition. That is, chemicals are always made up of the same "things". Some chemicals are found in nature, such as water. Other chemicals are also manufactured, such as chlorine (used in bleaching fabrics and in swimming pools).
There are four main types of compounds, distinguished by how the atoms are bonded together. Molecular compounds are bound by covalent bonds. Ionic compounds are held together by ionic bonds. Intermetallic compounds are held together by metallic bonds. Coordination complexes are held together by coordinate covalent bonds. Non-stoichiometric compounds form a controversial edge case.
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What is a feature of object-oriented computing?
sstateless encapsulation of states platform-independentside-effect free
The feature of object-oriented computing is an encapsulation of states. The correct option is b.
What is object-oriented computing?Object-oriented computing, the short form, is OOP. A computer programming paradigm known as object-oriented programming (OOP) arranges the architecture of software around data or objects rather than functions and logic.
An object is a data field with particular characteristics and behavior. It contains data and codes. It is stored in the form of a procedure. Furthermore, it is a programming paradigm.
Thus, the correct option is b. encapsulation of states.
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The energy recommendation that describes the proportions of calories that should come from carbohydrate, fat, and protein are the: ______.
a. ears
b. ais
c. amdrs
d. dris
Explanation:
what are you feeling now I am looking forward
21. When a sulfur atom reacts with other atoms, electrons in the atom's third energy level are involved. How many such electrons does a sulfur atom have?
The electrons in the atom's third energy level that are involved in chemical reaction are six in number.
How many electrons does sulfur have?
Sulfur is an element that can be found in group sixteen of the periodic table. It has a valency of two because it has six electrons in the outermost shell and shares two more electrons with another element in order to form a covalent bond.
There are three electron shells that could be found in sulfur. The first shell has two electrons, the second shell has eight electrons while the last shell has six electrons.
As such, the electrons in the atom's third energy level that are involved in chemical reaction are six in number.
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A compound is known to consist of 23.8% carbon, 5.9% hydrogen, and 70.3% chlorine. Find its formula.
how about give me brainliest b ll tt cc hh
differentiate between an ion and a free radical
The key difference between free radical and ion is that the free radicals have one or more unpaired electron, but ions have paired electrons.
What is the Paired and Unpaired Electrons?
Unpaired electrons are the ones that appear in an orbital alone, while paired electrons are the ones that appear in an orbital as pairs in an atom. So, in the orbital, paired electrons always appear as two electrons, whereas unpaired electrons always appear as a single electron. The main distinction between paired and unpaired electrons is this. Additionally, whereas unpaired electrons result in paramagnetism or ferromagnetism in atoms, paired electrons cause diamagnetism in atoms.
What is Diamagnetism ?A change in the orbital motion of electrons caused by an applied magnetic field induces diamagnetism, a very weak form of magnetism. This magnetism is transient and only endures when an outside field is present.
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The atomic number corresponds to the number of ________ in a specific element, while the atomic weight corresponds to the number of ________ in a specific element.
The atomic number and mass number corresponds to the number of electrons and protons in a specific element, while the atomic number and mass number corresponds to the number of nucleons(protons and neutrons) in a specific element.
What is atomic number and mass number?
The number of protons in the nucleus of each element's atoms, represented by the symbol Z, is the element's atomic number. The sum of the protons and neutrons in an element's nucleus is known as the mass number (A).
Thus, atomic no. is the count of electrons or protons in an element whereas, atomic mass or weight refers to the no. of nucleons that is the sum of protons and neutrons in the nucleus of the element.
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The approximate diameter of the spherical nucleus of hydrogen-1 atom is 1 x 10-13 cm. estimate the density (g/cm3) of matter in a proton of mass of proton is 1.673 x10-24 g.
The density is 3.193 × 10^15 g/cm3.
Given;
Diameter = 1 x 10-13 cm
Mass = 1.673 x10-24 g
Volume = 4/3πr^3
Volume = 4/3 × 22/7 × (1 × 10^-13 / 2)^3
Volume = 11 × 10^-39 / 21
Density = Mass / Volume
= 1.673 x10-24 / 11 × 10^-39 / 21
Density = 3.193 × 10^15 g/cm3
What is density?
The amount of objects, including people, animals, plants, and other living things, that are present in a region is known as the density. The number of objects is divided by the area to determine density. The number of inhabitants in a nation divided by its size, measured in square kilometers or miles, is the population density of that nation.
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What does criteria mean in science?
Answer:
a standard by which something may be judged.
Explanation:
A 21.0 -cm -long cylindrical glass tube sealed at one end is filled with ethanol the mass of ethanol needed to fill the tube is found to be 44.23 g the density of ethanol is 0.789 g/ml calculate the inner diameter of the tube in centimeters
1.843 cm is the inner diameter of a 21.0 cm long cylindrical glass tube.
What is inner diameter of a cylinder?
Two times the wall thickness of the pipe is subtracted from the total exterior diameter to determine the inner diameter of the pipe. By removing the pipe's walls from the computation, just the internal diameter remains.
Lets volume of tube be V
V = 44.23/0.789
calculate by using conversion factor= 56.058 cm^3
Volume of cylinder = πr^2h
⇒ r^2= [tex]\frac{V}{\pi h}[/tex] ,
⇒ r = [tex]\sqrt{\frac{V}{\pi h}}[/tex]
⇒ r = [tex]\sqrt{\frac{56.058 }{\pi 21}}[/tex]
⇒ r = 0.9215 cm
And as we have radius, we can calculate diameter
d = 2r = 2 × 0.9215 cm = 1.843 cm
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the rate constant for this first‑order reaction is 0.930 s−10.930 s−1 at 400 ∘c.400 ∘c. a⟶products a⟶products how long, in seconds, would it take for the concentration of aa to decrease from 0.810 m0.810 m to 0.260 m?0.260 m? ????
It would take 1.23 seconds for the concentration of A to decrease from 0.810M to 0.260 M.
Balanced chemical equation: A → product
c₀(A) = 0.810 M; initial concentration of reactant A
c(A) = 0.260 M; concentration of reactant A after time t
k = 0.930 s⁻¹; the rate constant for this first‑order reaction
ln c(A) = ln c₀(A) - k·t; a first-order is proportional to the concentration of the reactant.
t = (ln c₀(A) - ln c(N₂O₅)) ÷ k.
t = (-0.21 + 1.35) ÷ 0.930 s⁻¹.
t = 1.14 ÷ 0.930 s⁻¹
t = 1.23 s; duration of this chemical reaction
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Analyze the diagram showing the changing states of matter. Drag the item from the item bank to its corresponding match.
The correct matches for changes of state are:
1 or 3 : Arrow that shows particles getting closer togethergas: State of matter that would fill any containerliquid: State of matter with definite volume but NOT shape2 or 4: Arrow that shows particles gaining energysolid: State of matter with definite shapeWhat is change of state?Change of state is the process whereby matter in one physical state is converted to matter in another state by the addition or removal of heat.
The process of change of state are:
Melting: solid to liquid due to addition of heatVaporization: liquid to gas due to addition of heatSublimation: solid to gas due to addition of heatFreezing: liquid to solid due to removal of heatCondensation: gas to liquid due to removal of heatDeposition: gas to solid due to removal of heatConsidering the given diagram, the correct matches are:
1 or 3 : Arrow that shows particles getting closer togethergas: State of matter that would fill any containerliquid: State of matter with definite volume but NOT shape2 or 4: Arrow that shows particles gaining energysolid: State of matter with definite shapeIn conclusion, change of state of matter occurs due to heat changes.
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What is the limiting reactant for the following reaction given we have 3.4 moles of ca(no3)2 and 2.4 moles of li3po4?
Calcium nitrate [tex]Ca(NO_{3})_{2}[/tex] )is the limiting reactant for the reaction.
This is fewer than the 2.4 moles of lithium phosphate [tex]Li_{3} PO_{4}[/tex] that are readily available. This indicates a deficiency in calcium nitrate[tex]Ca(NO_{3})_{2}[/tex]. 2.4 moles of lithium phosphate must be added in order to complete the reaction.
As a result, calcium nitrate [tex]Ca(NO_{3})_{2}[/tex] is the limiting reagent and lithium phosphate[tex]Li_{3} PO_{4}[/tex] is in excess. The availability of Calcium Nitrate [tex]Ca(NO_{3})_{2}[/tex] is lesser than the 2.4 moles of lithium phosphate [tex]Li_{3} PO_{4}[/tex] that are accessible. This indicates that present amount of calcium nitrate [tex]Ca(NO_{3})_{2}[/tex] is inadequate to completely react with 2.4 moles of lithium phosphate[tex]Li_{3} PO_{4}[/tex]. Thus, calcium nitrate [tex]Ca(NO_{3})_{2}[/tex] is the limiting reagent and lithium phosphate [tex]Li_{3} PO_{4}[/tex] is in excess.
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What are hydrocarbons?
Answer:
a compound of hydrogen and carbon, such as any of those which are the chief components of petroleum and natural gas.
"the rain is rich in benzene and hydrocarbons"
Answer: a compound of hydrogen and carbon, such as any of those which are the chief components of petroleum and natural gas.
Explanation:
in organic chemistry, a hydrocarbon is an organic compound consisting entirely of hydrogen and carbon. Hydrocarbons are examples of group 14 hydrides. Hydrocarbons are generally colorless and hydrophobic, and their odors are usually weak or exemplified by the odors of gasoline and lighter fluid.
state what would be observed if each of the following reagents was added to the solution of aluminum chloride
i) lead (ii) nitrate solution
ii) ammonia solution drop wise until in excess
Answer:
See explanation
Explanation:
1) a precipitate of lead chloride would be observed if the concentrations of both reagents was high enough and the temperature was low enough
2) A gelatinous white-ish precipitate would be observed at first, though i'm not sure what would happen with excess ammonia. The precipitate would likely not dissolve in excess ammonia
Restate how a satellite stays in orbit with your own words, as if you were trying to explain the process to a younger friend or sibling
Satellite stays in orbit because of two factors velocity and gravitational pull of Earth.
A rocket fired from the ground with enough power to leave our atmosphere is used to put satellites into orbit.The satellite is dropped into orbit once the rocket arrives at the predetermined location.A satellite can stay in orbit for hundreds of years if it maintains its initial speed once it separates from the launch vehicle.A satellite keeps its orbit in place by balancing the gravitational pull of Earth with its velocity, which is the speed required to move in a straight line. In order to withstand the stronger gravitational attraction, a satellite must circle at a faster pace as it gets closer to the Earth.In short, they hold their place by locking into speeds that are quick enough to overcome gravity's pull downward.Therefore, Satellite stays in orbit.
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An oxygen (o) atom has _____ protons, _____ neutrons, and _____ unfilled electron orbitals.
An oxygen (o) atom has 8 protons, 8 neutrons, and 2 unfilled electron orbitals.
What is electron orbitals?The three-dimensional regions surrounding an atom's nucleus known as electron orbitals are where a certain electron can be found. Two electrons can fit into each orbital.
They go by the name of atomic orbitals too. The number of electrons an atom contains determines the form of its atomic orbitals. The s, p, d, and f orbitals will all be covered in this lesson. Their orbital forms will also be revealed to us.
An orbital is a mathematical function that, according to its precise definition, represents the location of an electron in an atom with a high degree of probability. According to the mathematical function for that orbital, the term "atomic orbital" often refers to the area of space where an electron might be present.
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Use the chemical reaction to answer the question.
CaCO3→CO2+CaO
A scientist heats 30 grams of calcium carbonate (CaCO3
) in the chemical reaction shown. What is the total mass of the products?
(1 point)
60 grams
15 grams
30 grams
10 grams
Answer:
Explanation: 15 grams trust me.!!
how is an atom formed?
Answer: See below.
Explanation: An atom is made up of protons, neutrons and electrons.
what name is given to this molecule? a positively charged molecule. this molecule consists of three hydrogen atoms bonded to an oxygen atom. what name is given to this molecule? a positively charged molecule. this molecule consists of three hydrogen atoms bonded to an oxygen atom. methane hydronium ion water glucose hydroxide ion
Answer:
h20
Explanation:
science, 3 hydrogen and one oxygen make h2o
[tex]H_3O^+[/tex], hydronium ion is the name given to this molecule. Therefore, the correct option is option B among all the given options.
The smallest recognisable unit which which a pure material may be split while retaining its composition and chemical characteristics is a molecule, which is a collection of two or more atoms. Until portions consisting of tiny molecules are reached, the division of a sample for a substance onto progressively smaller parts does not result in a change with respect to its composition as well as its chemical characteristics. [tex]H_3O^+[/tex], hydronium ion is the name given to this molecule.
Therefore, the correct option is option B among all the given options.
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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.
Question 1 (1 point)
A block has a density of 1.73 g/mL. What is the block's density in mg/L?
172
A block has a density of 1.73 g/mL has a density of 1.73 * 10⁶ mg/L.
What is density of a substance?The density of a substance is the ratio of the mass of a a given volume of a substance and the volume of that substance.
Mathematically, the density of a substance is given by the formula shown below:
Density = mass of substance/volume of substance.Depending on the units in which the mass and volume of the substance is given, the unit of density can be given as follows:
kilogram per cubic meter; kg/m³
gram per cubic centimeter; g/cm³
gram per liter; g/L
milligram per liter; mg/L
The given block has a density of 1.73 g/mL.
To convert from gram to mg, we multiply by 1000
1.73 g = 1.73 * 1000 = 1730 mg
to convert from mL to L, we divide by 1000
1 mL = 0.001 L
Density of the block in mg/L = 1730 mg/ 0.001 L
Density of the block in mg/L = 1.73 * 10⁶ mg/L
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An x-ray has a wavelength
of 2.2 x 10-11 m. What is
the frequency of the x-ray? Help asap please
Answer:
C
Explanation:
For electromagnetic waves frequency X wavelength = speed of light
f * 2.2 x 10^-11 = 3 x 10^8 m/s
f = 3 x 10^8 / 2.2 x 10^-11
= 1.36 x 10 ^19
= 1.4 x 10^19 with two significant digits
Answer: it's not C, it is A.
