The energy of the photon is 1.5 * 10^-19 J
What is the Bohr model?According to the Bohr model of the atom, the atom is arranged in energy levels. It is possible for an electron to transition from a lower to a higher energy level by the gain of energy. The energy that is gained must be equal to the difference in energy between the lower and the higher energy levels of the atom.
No we know that we could use the Rydberg formula to obtain the wavelength of the photon that is emitted when an electron moves from a higher to a lower energy level with the emission of the energy that was taken in.
Thus;
1/λ = RH (1/n^2 final – 1/n^2 initial)
RH = 1.09678 x 10⁷ m⁻¹
n final = 3
n initial = 5
1/λ =1.09678 x 10⁷ (1/3^2 – 1/5^2)
1/λ = 1.09678 x 10⁷ (0.11 – 0.04)
λ = 1302 nm
E = hc/ λ
E = 6.6 * 10^-34 * 3 * 10^8/1302 * 10^-9
E = 1.5 * 10^-19 J
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State the charge on an electron
-1
0
+1
Answer:
an electron charge is -1
Bimetallic meters can be used to measure temperatures from ____°F to __°F.
O-300; 800
O-300; 100
O-112; 760
O-100; 500
-300;800 is the correct answer
Identify the approximate bond angles for the following molecules.
Drag the appropriate items to their respective bins.
sulfur difluoride (SF₂) hydrogen sulfide (H₂S) carbon tetrafluoride (CF4)
chloroform (CHCl)
Bond angle 109.5
Bond angle <109.5
Bond angle >109.5⁰
The bond angle of sulfur difluoride (SF₂) is < 109.5 °
hydrogen sulfide (H₂S) Bond angle < 109.5 °
carbon tetrafluoride ([tex]CF_{4}[/tex]) is 109.5 °
and chloroform ([tex]CHCl_{3}[/tex]) is 109.5 ° .
The bond angle of sulfur difluoride and hydrogen sulfide is less than 109.5 ° due to repulsion in the two lone pair of the electron present in these molecule .
Electron repulsion between the linked pairs and bond angles rise as the central atom's remaining electron density increases . The higher bond angle of ammonia (106.6°) than [tex]NF_{3}[/tex] (102.2°) can also be attributed to the electronegativity theory .
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what is annulus class 9 modern book
A series of concentric circles make form the geometric shape known as the annulus. Each circle has the same radius, and there is an equal distance between them. Both the size of a circular region and the circumference of the circle can be determined using the annulus.
An animal or plant's annulus is a ring-shaped structure. The portion of the stem that holds the leaves in place on plants is known as the annulus. The stem's annulus, which similarly shrinks to let the plant move, is another example of this. The portion of the skeleton that encircles the spinal cord in animals is known as the annulus. The annulus helps to maintain the body upright while safeguarding the spinal cord.
A new ring is built on a molecule via the chemical reaction known as annulation in organic chemistry. Helicenes and acenes are two examples of side-on condensed cyclic segments that are used to build annular molecules.
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Which of the following choices is the one that does NOT describe a chemical
property?
Concentrated hydrochloric acid will burn a hole in cotton jeans because the acid
breaks down the cellulose fibers in cotton.
Copper metal combines with substances in the air to form a green "patina" that
protects the copper from further reaction.
Copper compounds often form beautiful blue crystals when a solution of a given
copper compound is evaporated slowly.
Oven cleaners contain sodium hydroxide, which converts the grease/oil spatters
inside the oven to water-soluble materials, which can be washed away.
Hydrogen peroxide fizzes when it is applied to a cut or scrape.
The following choice is not a chemical property is Copper compounds often form beautiful blue crystals when a solution of a given copper compound is evaporated slowly.
Chemical Property is defined as the any substance's or particles properties that can be seen changing before and after is known as chemical property.
Ignitible, pH value, chemical stability are some of the properties of chemical property.
The other options are chemical property first one is burning a piece of cloth and leave another acid, another one is forming a gas, the another one is also changing the property into soluble form , and the last one is wound is fizzing so it is also a chemical property.
Hence, the option (c) isn't a chemical property.
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4.00 x 10-2 mL of bromine (a liquid element) weigh 0.1249 g. What is the density of bromine?
The density of 4.00 mL x 10⁻² mL of bromine (liquid) weighing 0.1249 g is 3.1225 g/mL.
Density of a liquid is defined as the mass of the substance per unit of its volume. Density is equal to the mass divided by the volume of any liquid. It is denoted by a Greek letter ρ. It is given by -
ρ = m
v
where,
ρ = density
m = mass
v = volume
To calculate the density of bromine liquid,
We use,
Density = mass
volume
Density = 0.1249 g
4.00 x 10⁻² mL
Density = 3.12 g/mL
Therefore, the density of bromine liquid is 3.12 g/mL
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Which action best completes the diagram showing how the federal budget is
created?
?
The president submits a budget plan to Congress.
Congress debates and finalizes the budget.
Congress returns the budget to the president.
The president signs the spending bill into law.
A. The president reviews the budget with the Supreme Court.
OB. Congress votes on requirements for a budget plan.
C. State governments submit their budget proposals.
OD. Executive agencies submit budget requests.
The process that completes the way that the the federal budget is created is that executive agencies submit budget requests.
What is the budget?The budget refers to the way in which the expenditure of the government is to be run in the coming year. It is customary that the executive must present their budget to the legislative arm of the government for consideration. It must be noted that the budget that has been drafted by the executive arm of government could only be passed into law by the legislative arm.
It is important to note that the legislative arm of government is composed of both the senate and the congress and the both chambers of the legislature must have to individually pass the appropriation bill before it could be passed into law by the president.
Hence, the process that completes the way that the the federal budget is created is that executive agencies submit budget requests.
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What are some examples of synthetic products made from metal ores?
Some examples of synthetic products made from metal ores include, aluminum, cobalt, copper, gold, plastics.
What are metal ores?Metal ores are the rocks from which metal is mostly extracted from, usually in a commercial quantity.
Also, metal ores are naturally occurring rocks that contain metals or metal compounds in sufficient amounts to make it worthwhile extracting them.
The method used to extract a given metal from its ore depends upon the reactivity of the metal and so how stable the ore is.
Examples of metal ores;
Cinnabar is ore of mercury, Sphalerite is ore of zinc,Cassiterite is ore of tin Some examples of synthetic products made from metal oresaluminum, cobalt, copper, goldplasticsThus, some examples of synthetic products made from metal ores include, aluminum, cobalt, copper, gold, plastics.
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Question 7 of 10
What property is used to calculate the pH of a solution?
Answer:
The hydrogen ion concentration in mol/L
Explanation:
Answer:
The pH of a solution is a measure of hydrogen ion concentration in mol/L
Explanation:
the concentration of hydrogen ions in a solution expressed usually in moles per liter or in pH units and used as a measure of the acidity of the solution
What is the mass of an object with a density of 1.35 g/mL & a volume of 24 mL?
gas,
che
on ozunds
Answer:
32 grams
Explanation:
To find the mass of the object, you need to multiply the given volume by the denisty. The denisty ratio compares the mass of an object per every 1 mL. It is important to arrange the denisty ratio in a way that allows for the cancellation of units (mL should be in the denominator). The final answer should have 2 sig figs.
Denisty = 1.35 g/mL
24 mL 1.35 g
---------------- x ----------------- = 32.4 g = 32 g (correct sig figs)
1 mL
One anabolic steroid is fluoxymesterone (C20H29FO3). Calculate the percent composition of carbon by mass of
fluoxymesterone.
Answer:
Percent Composition (C) = 71.40%
Explanation:
To find the percent composition of carbon by mass, you need to (1) calculate the molar mass of C₂₀H₂₉FO₃ (using the atomic masses of each atom in the molecule), then (2) calculate the total amount of carbon in C₂₀H₂₉FO₃ (using the atomic mass of carbon), and then (3) calculate the percent composition of carbon.
(Step 1)
Atomic Mass (C): 12.011 g/mol
Atomic Mass (H): 1.008 g/mol
Atomic Mass (F): 18.998 g/mol
Atomic Mass (O): 15.999 g/mol
Molar Mass (C₂₀H₂₉FO₃):
20(12.011 g/mol) + 29(1.008 g/mol) + 18.998 g/mol + 3(15.999 g/mol)
= 336.447 g/mol
(Step 2)
Atomic Mass (C): 12.011 g/mol
Total Mass (C): 20(12.011 g/mol) = 240.22 g/mol
(Step 3)
mass of carbon
Percent Composition (C) = ----------------------------- x 100%
mass of molecule
240.22 grams
Percent Composition (C) = ----------------------------- x 100%
336.447 grams
Percent Composition (C) = 71.40%
Check all the formulas below that represent binary compounds.
NH4CL
CaS
P₂05
CaSO4
N₂O
Cl₂
Binary compound is a substance that is made up of precisely two separate components and cannot be further simplified chemically. Binary compounds include, for instance, H₂O, H₂S, and NH₃.
1. NH₄Cl - It is not a binary compound because it contains more than two elements that is Nitrogen, hydrogen and chlorine.
2. CaS - It is a binary compound because it contains two elements Calcium and sulfur.
3. P₂O₅ - It is a binary compound because it contains two elements Phosphorus and Oxygen.
3. CaSO₄ - It is not a binary compound because it contains more than two elements that is calcium, sulfur and oxygen.
4. N₂O - It is a binary compound because it contains two elements that is Nitrogen and Oxygen.
5. Cl₂- It is not a binary compound because it does not contain two different elements rather it is a diatomic molecule.
Diatomic molecules- Two atoms are chemically linked together to form diatomic molecules. A homonuclear diatomic molecule is created when two identical atoms combine, such as in the oxygen molecule (O₂). A heteronuclear diatomic molecule is created when two unidentical atoms combine, such as in the CO₂ .
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Fe in Prussian blue, Fe4[Fe(CN)6]3 (a pigment used in paints and printing inks)
Express your answer using five significant figures. Determine the percent,by mass, for Fe
The percent by mass of iron in Prussian blue is 32.6%.
What is Prussian blue?The salt called Prussian blue is a salt that is of the family of the ferrocyanide salts. They are commonly used as dyes. This compound as it is know could be used as a blue dye in many quarters. In medicine it could be used to assist the body to expedite the elimination of certain elements or harmful chemicals from the body.
We are here mandated to obtain the percent by mass of the iron atom in the Prussian blue;
Molar mass of Prussian blue = 859
Mass of iron in Prussian blue = 5(56) = 280
Percent by mass of Prussian blue = 280/ 859 * 100 = 32.6%
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1) Complete the sentence: If a group 1 metal loses an electron, it has the electron configuration (2 correct answers)
A of the noble gas in the same period
B that has a full octet in the highest energy level
C that matches the group 17 nonmetal in the period before it
D of the noble gas in the period before it
2 Ionization energies for nonmetals are ____________ than metals because they would rather __________ electrons than lose electrons, so it takes ___________
A energy to remove an electron.
B higher, gain, more
C higher, gain, less
D lower, gain, less
HELP ME RIGHT NOW, PLEASE THANKS YOU
The accurate responses are;
1) it has the configuration of of the noble gas in the same period
2) higher, gain, more
What is the electron configuration?The electron configuration shows the arrangement of the atoms in an element. We know that in an element, the nucleus is at the core of the atom. The shells have energies increasing order with the shells that are close to the nucleus having the lowest energy and the energy of the shells tends to increase radially outwards from the nucleus.
Now let us try to look at sodium. We know that the formation of ions leads an element to attain the noble gas configuration. We can see that when sodium loses an electron, it closely resembles the noble gas neon.
The ionization energy is the energy that is required for the removal of one electron from the outermost shell of the atom. The complete statement therefore is; Ionization energies for nonmetals are higher than metals because they would rather gain electrons than lose electrons, so it takes more energy.
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Previously cooked food must reheated to
Previously cooked food must reheated to temperatures of at least 165°F.
What temperature must previously cooked food must reheated to?When food is cooked, it should be eaten and any leftovers preserved.
Leftovers can be preserved by refrigeration.
However, when this refrigerated food is to be eaten again, it should be reheated before eating.
Previously cooked food must be heated to prevent spoilage and poisoning.
The addition of heat will prevent spoilage by:
Killing most microorganisms that may be present in the fooddenaturing the activity of the enzymes present in these organisms.Previously cooked food must reheated to temperatures of at least 165 °F.
The process of reheating the food may be done in microwave oven or over a stove.
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PLEASE HELP ME THERES 100 POINTS ON THE LINE
Answer:
1.93 2.86
Explanation:
exactly the reason for the above text
A polystyrene cup is used to minimise thermal energy loss.
a. Explain why it is important to take steps to minimise thermal energy loss.
b. How else could thermal energy loss be minimised in this experiment?
PLEASE HELP
A polystyrene cup is used to minimise the thermal energy loss because polystyrene cup is acts as a very good insulator.
It is important to use polystyrene cup to minimise thermal energy loss because it prevent the heat energy loss as it has air bubbled trapped inside them. if we hold a hot coffee in a polystyrene cup , the hot coffee does not burn your finger because it is a bad conductor of heat. it is a natural insulator. we can also use this styroform or polystyrene idea to make home warm in cold region , it reduce the transfer of heat ,so that building stays warmer.
We can use plastic foam to reduce heat energy loss . Both polystyrene and plastic foams are the good insulators and bad conductor of heat.
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Why does the temperature of the boiling water stop changing as you continue to add heat?
inging as you
The temperature of the boiling water stop changing as you continue to add heat because all the heat energy is used up in changing water from liquid state to vapor state.
When we heat the water and once water starts boiling , the heat supplied will be used in state conversion , from liquid to gaseous vapour. in other words, energy added to liquid used into breaking bonds between liquid molecules without changing the temperature.
All the energy provided in the form of heat increases the kinetic energy of particles and temperature does not increase. The boiling point of water depends on atmospheric pressure. At 1 atm the boiling point of water is 100°C.
Hence, The temperature of the boiling water stop changing as you continue to add heat because all the heat energy is used up in changing water from liquid state to vapor state.
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What laboratory equipment do you need to prepare 250 mL of a 0.010 M solution of NaCl from a stock solution?
The equipment we used to prepare 250 ml of a 0.010 M solution of NaCl from a stock solution is Volumetric flask (piece of lab).
It is calibrated to comprise a precise volume (v) at a given temperature.
It is used for accurate results in dilutions and to prepare a solutions that is needed according to the experiment.
Volumetric flask short form is vol flask.
A stock solution is defined as the standard solution made using nearly accurate experiment.
Example of stock solution - Two M sol of tris-HCL, 5M sol of NaCl.
Stock Solution formula = C1*V1 = C2*V2
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If 1.00 mol of argon is placed in a 0.500- L container at 24.0 ∘C , what is the difference between the ideal pressure (as predicted by the ideal gas law) and the real pressure (as predicted by the van der Waals equation)? For argon, a=1.345(L2⋅atm)/mol2 and b=0.03219L/mol .
Express your answer to two significant figures and include the appropriate units.
The difference between the ideal pressure and the pressure calculated by the Van Der Waal equation is 2.08 atm.
What is the pressure?In this problem, we are mandated to obtain the pressure both by the use of the ideal gas equation and then the use of the Van der Walls equation.
Using the idea gas equation;
PV = nRT
P = nRT/V
P = pressure
V = volume
n = number of moles
T = temperature
R = gas constant
P = 1 * 0.082 * (24 + 273)/0.5
P = 48.7 atm
Using the Van Der Wall equation:
P = RT/(V - b) - a /V^2
P = 0.082 * 297/(0.5 - 0.03219) - 1.345/(0.5)^2
P = 24.354/0.46781 - 1.345/ /0.25
P = 52 - 5.38
P = 46.62 atm
The difference between the ideal pressure and the pressure calculated by the Van Der Waal equation is; 48.7 atm - 46.62 atm = 2.08 atm
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what is the thing aroud the nucisel
Answer:
Electrons
Explanation:
Assuming you are talking about the nucleus of an atom, the particles surrounding the nucleus are electrons.
Atoms consist of three subatomic particles: protons, neutrons, and electrons. Protons and neutrons are located within the nucleus, whereas the electrons exist outside of it.
the half life of radioactive iodine 137 is 8 days. how many iodine nucei are necessary to produce an activity of 1.0 micro Ci?
The half life of radioactive iodine 137 is 8 days 0.0866 iodine nuclei are necessary to produce an activity of 1.0 micro Ci
Here given data is half life of radioactive iodine 137 = 8days
Activity of iodine is = 1.0micro Ci
Radioactive decay is the process by which an unstable atomic nucleus loses energy by radiation and the material containing unstable nuclei is considered radioactive
The interconnection between the decay constant and half-life of any sample can be given by the expression are
T1/2 = (0.693/R); T1/2 = 8
8 = 0.693/R; R=0.0866 R=0.693×1.0/t1/2 = 0.0866
0.0866 iodine nuclei are necessary to produce an activity of 1.0 micro Ci
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use evidence to explain how advancements in technology influenced cell theory
The evidence to explain how advancements in technology influenced cell theory is the invention of microscopes. It has lead the way into the discovery of cells.
The magnification and resolution technology in microscopes have helped the scientists to observe the characteristics of cells and to understand the organization of the life.Cell theory is a scientific theory which was first formulated in the mid-nineteenth century. It states that the living organisms are made up of cells. All cells come from the pre-existing cells. Cells are the basic structural and organizational unit of all the organisms.Technology such as lenses, magnifying glasses, and microscopes had an impact on the development of the cell theory. Below are some examples of how such technologies contributed to the cell theory.The first time the word cell was used to refer to these tiny units of life was in 1665 by a British scientist named Robert Hooke.The invention of the microscope led to the discovery of the cell by Robert Hooke. He observed a box-shaped structures, which he called “cells” as it reminded him of the cells, or rooms, when he was looking at the cork. This discovery led to the formation of the cell theory.After Robert Hooke discovered cells in cork, Anton van Leeuwenhoek in Holland made other important discoveries using a microscope. Leeuwenhoek made his own microscope lenses. His microscope was more powerful than other microscopes of that time. Leeuwenhoek’s microscope was almost as strong as modern light microscopes. Leeuwenhoek used his microscope and became the first person to observe human cells and bacteria.These inventions led to advancements in cell theory.To learn more about cell theory,
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The image shows the products of a combustion reaction of a hydrocarbon containing only carbon and hydrogen. The large, red spheres represent oxygen atoms, the small, white spheres represent hydrogen atoms, and the grey spheres represent carbon atoms.
In this image, there are 8 molecules composed of a central red atom bound to two different white atoms. There are also 4 molecules composed of a central grey atom bound to two different red atoms.
Determine the empirical formula of the hydrocarbon based on these products.
empirical formula:
Answer:
CH4
Explanation:
Since it's a hydrocarbon, ignore the reds, only looks at the white and grey,
The empirical formula of the hydrocarbon based on these products, CH₄. The molecular name of CH₄ is methane.
What are hydrocarbons ?An organic substance made completely of hydrogen and carbon is called a hydrocarbon. Examples of group 14 hydrides include hydrocarbons. The majority of hydrocarbons are colorless and hydrophobic, and their scents are either insignificant or best characterized by those of gasoline and lighter fluid.
The four different kinds of hydrocarbons are alkanes, alkenes, alkynes, and aromatic hydrocarbons.
The essential energy-storing molecules in all significant forms of fossil fuels and biofuels are hydrocarbons. They serve as the raw material for making many different kinds of polymers.
Thus, The empirical formula of the hydrocarbon based on these products, CH₄.
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Hydroxyapatite, Ca5(PO4)3(OH), is the main mineral component of dental enamel, dentin, and bone, and thus it has many medical uses. Coating it on metallic implants (such as titanium alloys and stainless steels) helps the body accept the implant. In the form of powder and beads, it is used to fill bone voids, which encourages natural bone to grow into the void. Hydroxyapatite is prepared by adding aqueous phosphoric acid to a dilute slurry of calcium hydroxide.
(a) Write a balanced equation for this preparation. Be sure to include the state of each reactant and product in the equation. Hint: Liquid water is one of the products of this reaction.
(b) What mass of hydroxyapatite could form from 128 g of 95.0% phosphoric acid and 113 g of calcium hydroxide?
g Ca5(PO4)3(OH)
The equation of the reaction is 5Ca(OH)₂ + 3H₃PO₄ ---> Ca₅(PO₄)₃(OH) + 9H₂O. The mass of hydroxyapatite that could form is 159.7 g
What is the equation of the reaction?We know that it is not possible to obtain the solutions to a problem of this sort unless we are able to obtain the balanced reaction equation. This is the only way that we are able to apply the stoichiometry solve the problem.
We have the balanced reaction equation as;
5Ca(OH)₂ + 3H₃PO₄ ---> Ca₅(PO₄)₃(OH) + 9H₂O.
Number of moles acid = 128 g /98.00 g/mol = 1.31 moles
Number of moles of calcium hydroxide = 113 g/ 74 g/mol = 1.59 moles
If 5 moles of calcium hydroxide reacts with 3 moles of acid
1.59 moles of calcium hydroxide reacts with 1.59 moles * 3 moles / 5 moles
= 0.954 moles
Hence calcium hydroxide is the limiting reactant.
Now;
5 moles of calcium hydroxide yields 1 mole of hydroxyapatite
1.59 moles of calcium hydroxide yields 1.59 moles * 1 mole /5 moles
= 0.318 moles of hydroxyapatite
Mass of hydroxyapatite = 0.318 moles * 502.3 g/mol
= 159.7 g
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The density of the object
is 3.0 g/mL.
What is its density in g/cm3?
density = [?] g/cm³
Round your answer to the tenths place.
Density (g/cm³)
Enter
The density of the object in g/cm³ is 3.0 .
Since the one mililiter is equal to one centimeter cube .
The density of the object is determined using the following formula and can be stated numerically as the mass per unit volume .
So, density = mass / volume = g / ml = g / cm³
While any unit of mass and volume can be used to compute density , like grams ( g ) and millilitres ( ml ) are the most often used units . As a result , density is expressed in grams per millilitre ( g/ml ) . The density is expressed in grams per centimeter cube also .
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Answer:
3.0
Explanation:
Three samples of granite were
massed. What is the total mass,
reported to the appropriate
number of significant figures?
67.4 g + 43.2 g + 27.3 g = [?] g please help i’m lost?!
The total mass , reported to the appropriate number of significant figures of three samples of granite when it were massed is 137.9 g .
Here we know that ,
Mass of the first granite sample = 67.4 g
Mass of the second sample = 43.2 g
Mass of the third sample = 27.3 g
We want to get the total mass for the three granite samples , then what we need to do is just add the three values that we know , this will give:
Total mass = 67.4 g + 43.2 g + 27.3 g = 137.9 g .
We conclude that the total mass of the three samples is 137.9 g .
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(01.01 LC)What is the body of scientific knowledge based on?
Guesses
Mysteries
Observations
Opinions
The body of scientific knowledge is based on different Observations (Option C).
What does observations mean in the scientific method?Observations in the scientific method are fundamental because it is the first step to raising scientific questions that may be explained through plausible hypotheses. Subsequently, hypotheses must be tested by experimental procedures.
In conclusion, the body of scientific knowledge is based on different Observations (Option C).
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Which type of energy is the total energy of kinetic energy and potential energy
in a system of objects?
A. sound energy
B. radiant energy
C. mechanical energy
What is the circumference of a circle
with a radius of 28 m?
175.93m hope this helps