The wavelength of the wave is obtained as 0.4 m.
What is the wavelength of the broadcasting station?The wavelength has to do with the distance that have been covered by the wave. In this case, we can use the frequency of the wave that have been supplied in the question and the speed of light which is a constant to be able to obtain the wavelength of the wave.
Knowing that;
wavelength = speed of light/frequency
speed of light = 3 * 10^8 m/s
Frequency = 742 * 10^3 Hz
wavelength = 3 * 10^8 m/s/ 742 * 10^3 Hz
= 0.4 m
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Magnetite, Fe3O4, is another ore of iron that contains both Fe²+ and Fe³+.
(a) Deduce the ratio of Fe²+: Fe³+ in Fe3O4.
The ratio of Fe²+: Fe³+ in Fe3O4 is 1:2
What is ore?
An ore is a naturally occurring deposit of geologic material (rock) that contains a sufficient quantity of one or more valuable elements or compounds to be economically mined. Metals such as copper, platinum, iron, lead, gold, silver, aluminium, nickel, and others are among these valuable elements. Nonmetals such as silicon and diamond may be found in ore. These valuable chemicals can be extracted and used in a variety of ways, from jewellery creation to electronic gadget manufacture. Ores vary greatly based on the parent rock's chemical composition as well as the natural mechanism by which they were created.
Mining corporations carefully analyse various issues before deciding to mine because extracting anything from the earth involves time, money, and effort. The ore grade, for example, indicates how much of the desired precious element or combination occurs inside the parent rock. The rock is regarded an ore if the required component is present in sufficient concentration for processing to be viable. Larger grade ores have higher concentrations of the desired ingredient, and vice versa.
Fe304 contains both Fe²+ and Fe³+
Then we have to deduce the ratio of Fe²+ and Fe³+.
We know that
Fe0 + Fe2O3 ---------> Fe3O4
Fe in Fe0 is Fe(II)
Fe in Fe2O3 is Fe(III)
Then we have see that
on combine Fe 2+ with Fe3 , Fe304 is form
Hence,
The ratio of Fe²+: Fe³+ in Fe3O4 is 1:2
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Determine the molecular formula for a molecule with 3.61 x 10^24 atoms of Carbon per mole of the compound, if it has the following compositions: 39.6% Carbon, 7.75% Hydrogen, and the remaining from Oxygen.
I have already figured out the empirical formula: C3H7O3
The empirical formula of compound is C₃H₇O₃. The molecular formula is 1, 2, 3, tri hydroxyl propane.
What is molecular formula ?
The molecular formula is an equation that specifies how many atoms of each element there are in a single compound's molecule. It displays the precise amount of atoms present in a molecule.
Propane, for instance, has the chemical formula C4H10. The given compound has a formula of 4 carbon atoms and 10 hydrogen atoms.
The empirical formula of compound is C₃H₇O₃.
Then, ( 12 × 3 ) + ( 1 × 7 ) + ( 16 × 3 )
= 36 + 7 + 48
= 91
( 39.6 ) + ( 7.75 ) = 47.35
91 - 47.35
= 43.65
Thus, molecular formula of given compound is 1, 2, 3, tri hydroxyl propane.
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To what volume should you dilute 35 mL of a 12 M stock HCl solution to obtain a 0.500 M
HCl solution?
Volume should you dilute 35 mL of a 12 M stock HCl solution to obtain a 0.500 M is 840 mL,
Given that :
Molarity of the solution M1 = 12 M
volume of the solution V1 = 35 mL
Molarity of the solution after the dilution M2 = 0.500 M
volume of the solution after the dilution V2 = ?
the dilution law states that :
M1 V1 = M2 V2
12 × 35 = 0.500 × V2
V2 = 840 mL
Thus, Volume should you dilute 35 mL of a 12 M stock HCl solution to obtain a 0.500 M is 840 mL.
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What volume of 0.180 M KOH is needed to react completely with 15.1 mL of 0.190 M H2SO4
The volume of 0.180 M KOH that would be needed to completely react with 15.1 mL of 0.190 M [tex]H_2SO_4[/tex] will be 31.88 mL
Stoichiometric problemThe equation of the reaction involving KOH and [tex]H_2SO_4[/tex] is as follows:
[tex]2KOH + H_2SO_4 --- > K_2SO_4 + 2H_2O[/tex]
The equation is already balanced and the mole ratio of KOH and [tex]H_2SO_4[/tex] is 2:1.
But 15.1 mL of 0.190 M [tex]H_2SO_4[/tex] is available.
Recall that:
mole = molarity x volume
Mole of 15.1 mL of 0.190 M [tex]H_2SO_4[/tex] = 0.190 x 15.1/1000
= 0.002869 mol
From the 2:1 mole ratio, the equivalent mol of KOH would then be:
0.002869 x 2 = 0.005738 mol
Since, mole = molarity x volume. Then, volume = mole/molarity
So, the volume of 0.005738 mol of 0.180 M KOH would be:
volume = 0.005738/0.180
= 0.03188 liters
Converting 0.03188 liters to mL:
0.03188 x 1000 = 31.88 mL
Thus, the volume of 0.180 M KOH needed to react completely with 15.1 mL of 0.190 M H2SO4 would be 31.88 mL.
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What is the oxidation number of an element
35.0 L of an ideal gas at 268 K and 5.16 atm are heated to 343 K with a new pressure of 7.65 atm. What is the new volume (in L)?
From the calculations, the new volume of the gas is 30.2 L.
What is the new volume?We know that we can be able to obtain the parameters that ahs to do with the gas by use of any of the equations of the laws that relate to an ideal gas.
Given that the;
Initial volume [tex]V_{1}[/tex] = 35.0 L
Initial temperature [tex]T_{1}[/tex] = 268 K
Initial pressure [tex]P_{1}[/tex] = 5.16 atm
Final temperature [tex]T_{2}[/tex] = 343 K
Final pressure [tex]P_{2}[/tex] = 7.65 atm
Final volume [tex]V_{2}[/tex] = ??
Then we have to use the general gas equation;
[tex]P_{1}[/tex] [tex]V_{1}[/tex]/ [tex]T_{1}[/tex]= [tex]P_{2}[/tex] [tex]V_{2}[/tex]/ [tex]T_{2}[/tex]
[tex]V_{2}[/tex] = 5.16 * 35.0 * 343/7.65 * 268
[tex]V_{2}[/tex] = 61945.8/2050.2
[tex]V_{2}[/tex] = 30.2 L
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PLEASE HELP
Can someone explain the step?
Calculate the mass (in grams) needed to prepare 0.505 liters of a 0.314 M CH,;O, solution.
You do not need to enter a unit with your answer.
The concentration terms are molality, normality and mole fraction. Molarity can be used to find out the ionic strength of any solution. Therefore, the mass of CH[tex]_2[/tex]O is 4.80g.
What is molarity?Molarity can be calculated by dividing number of moles of solute by volume of solution in liter. Molarity is affected by temperature. Its unit is mole/liter. It measure the concentration of any solute in a solution.
Mathematically,
Molarity= number of moles of solute÷ Volume of solution in liter
number of moles of solute =given mass÷ Molar mass of solute
number of moles of solute =mass÷30.03 g/mol
Molarity=0.314 M
Volume of solution=0.505 liters
Substituting all the given values, we get
0.314 M= {mass÷30.03 g/mol}÷ 0.505 liters
mass÷30.03 g/mol=0.15
mass =4.80g
Therefore, the mass of CH[tex]_2[/tex]O is 4.80g.
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how many signals will be expected in the 1H NMR spectrum of the following compound?
In this compound, there would be five proton NMR signals,
What is the proton NMR spectrum?We know that the acronym NMR means nuclear magnetic resonance. It has to do with the kind of spectrum in which the kind of chemical environment where the proton is found would impact the spectrum that is observed in the compound.
The first thing that we need to look at and find out in the image is to be able to find out the number of chemical environments that we have in the compound as we can see it in the image.
By studying the compound closely, we can see that there are four different proton chemical environments that we can be able to see and map out from the compound and it is these chemical environments that tell us the number of signals to expect.
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Question: Children in a tree house lift a small dog in a basket 3.95 m up to their house. If it takes 221 J of work to do this, what is the combined mass of the dog and basket?
Express your answer using three significant figures.
Answer: M = ? kg
The combined mass of the dog and the basket is equal to 5.71 Kg.
What is work?Work can be described as the energy used when applying a force to move an object through a definite displacement.
The work done by a force to move an object through a displacement can be represented as:
W = F.dcosθ
Where θ is angle between displacement and force.
Given, the height the basket lifted up, d = 1.4 m
The angle between force and displacement, θ = 0°
Thus, the work done when lifting the basket is:
W = F d cosθ
W = mg.d cosθ
W = mg.d cos0°
m = W/gd
m = 221/(9.8).(3.95)
m = 5.71 Kg
Therefore, the mass of the basket and dog is equal to 5.71 Kg.
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How many molecules are in 12.80 moles of strontium bydroxide?
77.094*[tex]10^{23}[/tex] molecules are in 12.80 moles of strontium bydroxide.
What does Sr OH 2's formula go by?The chemical strontium hydroxide has a molecular weight of 121.6324 g/mol and the molecular formula Sr(OH)2. It appears in the form of an anhydrate with prismatic, colorless crystals that are liquescent.
What fraction of atoms and molecules makes up NaOH?The building By counting the number of components (and their corresponding quantities) listed in the chemical formula, one can easily determine that each molecule of the compound NaOH contains three atoms.
By mole concept-
1moleof strontium bydroxide =6.023*[tex]10^{23}[/tex] molecules of strontium bydroxide.
so,
12.80 moles of strontium bydroxide =12.80*6.023*[tex]10^{23}[/tex]
No of molecule =77.094*[tex]10^{23}[/tex] molecule
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How many molecules are in 72.0 moles of CO₂?
Taking into account the definition of Avogadro's Number, 4.33656×10²⁵ molecules are in 72 moles of CO₂.
Avogadro's NumberAvogadro's Number is called the number of particles that make up a substance (usually atoms or molecules). This particles 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 molecules on 72 moles of CO₂Then you can apply the following rule of three: if 1 mole of CO₂ contains 6.023×10²³ molecules, 72 moles of CO₂ contains how many molecules?
amount of molecules of CO₂= (6.023×10²³ molecules × 72 mole)÷ 1 mole
amount of molecules of CO₂= 4.33656×10²⁵ molecules
Finally, 4.33656×10²⁵ molecules are present in 72 moles of CO₂.
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Does hydrogen satisfy the octet rule when it bonds with other elements having 2 valence electrons?
Why?
Each Hydrogen atom has 1 valence electron. Since Hydrogen can only fit a max of 2 valence electrons in its orbital, each Hydrogen atom only needs 1 electron. Each atom has 1 valence electron, so they can just share, giving each atom two electrons each.
True or false
Inertia and distance combine to keep Earth in orbit around the Sun and the Moon in orbit around Earth.
The statement " Inertia and distance combine to keep Earth in orbit around the Sun and the Moon in orbit around Earth " is false.
Why Inertia and distance does not combine to keep Earth in orbit around the Sun and the Moon in orbit around Earth?According to Sir Isaac Newton, he proposed and concluded in his investigation that the earth is being kept in its orbit around the Sun and the Moon in orbit around Earth by means of gravity and inertia. This is not done through inertia and distance.
In conclusion, it can be deduced from the explanation given above that inertia and gravity combine to keep the earth in orbit around the Sun and the Moon in orbit around Earth.
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the nuclear equation of the neutron bombardment of cobalt-60
The nuclear equation for this reaction shows the gamma rays that are released when cobalt-60 is produced. 5927Co+10n⟶6027Co+γ
What is nuclear reaction ?
In nuclear physics and chemistry, a nuclear reaction is the process by which two atomic nuclei or nuclei and external particles collide to produce one or more new nuclides. Therefore, a nuclear reaction must transform at least one nuclide into another nuclide. When a nucleus interacts with another nucleus or particle and they separate without changing the properties of the nuclide, this process is simply called a form of nuclear scattering and is not a nuclear reaction.
Although in principle two or more particles could react and collide, the probability of three or more nuclei colliding in the same place at the same time is much lower than for two nuclei, so such Incidents are very rare.
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Write the balanced NET ionic equation for the
reaction when AICIs and NaOH are mixed in
aqueous solution. If no reaction occurs, simply write
only NR. Be sure to include the proper phases for all
species within the reaction.
The balanced NET ionic equation is
Al(OH)3 ----> Al3+(aq) + 3OH(aq) (s)
When AICI and NaOH are combined in an aqueous solution, the following balanced NET ionic equation describes the reaction:
Al(OH)3 -----> Al3+(aq) + 3OH(aq) (s)
An exchange reaction occurs when AICI and NaOH are combined.
Al(OH)3(s) + 3NaCl(aq) -----> AlCl3(aq) + 3NaOH(aq) (1)
In this reaction, the ions Al+3 and Na+ exchange Cl- and OH- ions.
The total ionic equation must first be written in order to create the NET ionic equation:
AI(OH)3(s) + 3Na+(aq) + 3Cl(aq) + Al3+(aq) + 3Cl(aq) + 3Na+(aq) + 3OH (aq) (2)
Since the Al(OH), precipitates, we are unable to describe it as an ion because the aqueous solution does not allow for its dissociation.
The following is the net ionic equation for reaction
Al3+(aq) plus 3OH-(aq) leads to Al(OH)3(s)
The net ionic equation excludes all repeating ions from reactants and products. We eliminated the Na+ and Cl- ions from the net ionic equation because of this
The balanced net ionic equation is as follows:
Al(OH)3 ----> Al3+(aq) + 3OH(aq) (s)
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What is the physical state of fluorine at 25 degrees?
Answer:
State : Gaseous state Colour : Pale yellow Odour : Irritating
Explanation:
At 25 degree celsius which is approximately known as the room temperature, Fluorine being the highest electronegative element has weak van der waal forces due to which the electrons are apart from each other. At a high enough temperature(room temp. in this case) that is higher than their boiling point, the fluorine atoms become gaseous particles. Hope you understood my explanation....Happy Learning:)
At 5:00 A.M. the temperature was
7 degrees below zero. At 8:00 A.M. the temperature is 7 degrees above zero. Is the weather getting warmer or colder?
A) warmer
B) colder
Answer:
A) Warmer
Explanation:
it says above 0
A chemist prepares a solution of mercury(I) chloride ( Hg2Cl2) by measuring out 0.000406 umol of mercury(I) chloride into a 200. mL volumetric flask and filling the flask to mark with water.
calculate the concentration in mmol/L of the chemist's mercury(I) chloride solution. Round your answer to 3 significant digits.
The concentration in mmol/L of the chemist's mercury(I) chloride solution. is 2.03 × 10^-8 M
We are given;
Number of moles of mercury (i) chloride as 0.000406 μmol
Volume is 200 mL
We are required to calculate the concentration of the solution.
We need to know that;
Concentration is also known as molarity is given by;
Molarity = Number of moles ÷ Volume
Number of moles = 4.06 × 10^-10 Moles
Volume = 0.02 L
Therefore;
Concentration = 4.06 × 10^-10 Moles ÷ 0.02L
= 2.03 × 10^-8 M
Thus, the molarity of the solution is 2.03× 10^-8 M.
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15. A 100 g sample of each of the following metals is heated from 35°C to 45°C. Which metal absorbs
the greatest amount of heat energy?
Metal
4
magnesium
e. copper
copper
magnesium
mercury
silver
lead
b. lead
c. silver
Specific Heat Capacity
0.385 J/(g-°C)
1.02 J/(g-°C)
0.138 J/g °C)
0.237 J/(g-°C)
0.129 J/(g-°C)
d. mercury
Answer:
b
Explanation:
erhqjh
How many joules are in 6,458 Cal? Express your answer in scientific notation with the correct number of significant figures.
The number of Joules in 6,458 Calories calculated to the correct number of significant figures would be 2.6790 x [tex]10^4[/tex] Joules.
Unit conversionBoth Joules (J) and Calories (Cal) are units of energy. According to the standard unit of conversion:
1 kiloCalorie = 4148 Joules
Since, 1 kiloCalorie = 1000 Calorie
Then:
1000 Calorie = 4148 Joules
Thus;
1 Calorie = 4148/1000
= 4.148 Joules
Now, let's see the number of Joules that is equivalent to 6,458 Calories.
1 Calorie = 4.148 Joules
6,458 Calories = 4.148 x 6,458
= 26787.784 Joules
According to one of the rules guiding significant figures when performing multiplication operations, the number with the lowest significant figure is considered for the significant figures of the final answer.
Thus, the final answer, in this case, would be to four significant figures.
In other words, 6,458 Calories = 2.6790 x [tex]10^4[/tex] Joules.
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A 1.20 L weather balloon on the ground has a temperature of 25.0°C and is at atmospheric pressure (1.00 atm). When it rises to an elevation where the pressure is 0.730 atm, then the new volume is 1.80 L. What is the temperature (in °C) of the air at this elevation?
The final temperature (°C) of the air at this elevation is 326.3K.
How to calculate temperature?The temperature of a gas can be calculated using the combined gas law equation as follows:
P₁V₁/T₁ = P₂V₂/T₂
Where;
P₁ = initial pressureV₁ = initial volumeT₁ = initial temperature P₂ = final pressureV₂ = final volumeT₂ = final temperatureAccording to this question, 1.20L weather balloon on the ground has a temperature of 25.0°C and is at atmospheric pressure (1.00 atm). When it rises to an elevation where the pressure is 0.730 atm, then the new volume is 1.80L. The final temperature can be calculated thus:
1 × 1.2/298 = 0.730 × 1.8/T₂
0.004027T = 1.314
T = 326.3K
Therefore, 326.3K is the final temperature of the balloon.
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Choose the list that shows the temperatures in order from warmest to coldest.
A) 11°F, 12°F, -11°F, -12°F
B) 12°F, 11°F, -12°F, -11°F
C) 12°F, 11°F, -11°F, -12°F
D) 12°F, -12°F, 11°F, -11°F
Answer: The answer would be C i think
Explanation:
4. In the space below, write the electron configurations of the following elements: using main shell, Subshell and Noble gas a) oxygen b) sodium c) Chlorine d) Nitrogen
The electronic configuration of oxygen is k =2, L=6 the subshell configuration is 1s², 2s²,2p⁴. Similarly the configuration of sodium is 1s², 2s²,2p⁶,3s¹ and that for chlorine is 1s², 2s²,2p⁶,3s²,3p⁵.
What is electronic configuration?The electronic configuration of an element is the distribution of electrons in different orbitals from the lowest energy level to the highest energy level.
Oxygen is 8th element thus having 8 electrons. The main shell configuration is K= 2, L= 6 and the subshell electronic configuration is 1s², 2s²,2p⁴.
Sodium is 11th element. The main shell electronic configuration is K=2, L=8, M=1. Subshell electronic configuration is 1s², 2s²,2p⁶,3s¹ and the noble gas configuration is [Ne]3s¹. Where Ne have 10 electrons.
Chlorine is 17th element with main shell configuration K =2, L=8, M=7.Subshell configuration 1s², 2s²,2p⁶,3s²,3p⁵ and noble gas configuration is [Ne] 3s² 3p⁵.
Nitrogen is 7th element with K= 2, L=5 and subshells, 1s², 2s²,2p³.
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Determine the number of atoms of O in 7.23 moles of Fe(NO₃)₃.
The number of atoms of Oxygen in 7.23 moles of Fe(NO₃)₃ is 3.92 x 10²⁵.
Determine to total number of individual molecules of Fe(NO₃)₃ in 7.23 moles.
Use Avogadro's number for this: 1 mole = 6.02 x 10²³ molecules.
Thus, 7.23 moles of Fe(NO₃)₃ contains molecules,
7.23 x 6.02 x 10²³ = 4.35 x 10²⁴ molecules of Fe(NO₃)₃.
Determine how many oxygen atoms in one molecule of Fe(NO₃)₃. There are 3 Oxygen atoms in the nitrate NO₃, and 3 nitrate groups in Fe(NO₃)₃. Thus, number of oxygen atoms in Fe(NO₃)₃ is,
3 x 3 = 9 Oxygen atoms in 1 molecule of Fe(NO₃)₃.
Finally, multiply the number of O atoms in 1 molecule of Fe(NO₃)₃ by the total number of Fe(NO₃)₃ molecules.
9 x 4.35 x 10²⁴ = 3.92 x 10²⁵ total Oxygen atoms.
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In a murder case, the prosecutor shows a photo to demonstrate the position of the body in relation to the rest of the crime scene. What type of photograph was MOST likely shown?
A.
an overview photograph
B.
an intermediate photograph
C.
a close-up photograph
D.
a personal photograph
A close-up photograph must be taken by the prosecutor to demonstrate the position of the body in relation to the rest of the crime scene.
For criminal investigation analysis, it becomes important to capture photographs from those areas in which acts of violence took place. To record the crime scene in more detail the photograph must be taken from close range and also with perfection. Close range photographs enables the viewer to understand where and how the crime was committed. The photographs of entry and exit of the crime scene is taken so carefully to observe the movement of the criminal before and after of the crime.
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Answer: C
Explanation:
How do I balance these equations? Please explain so I can learn how.
One mole of CS₂ and two moles of H₂S are formed as products and 3 moles of CH₄ are leftover.
What is the limiting reagent?A limiting reagent is a reactant that is fully exhausted from the reaction mixture at the completion of a reaction. The limiting reactant will decide the maximum amount of product.
Given, a balanced chemical equation of the reaction between methane and sulphur is:
[tex]CH_4 + 4S\longrightarrow CS_2 +2H_2S[/tex]
Given, the number of moles of the sulphur = 4
The number of moles of methane = 4
From the chemical reaction, one mole of methane reacts with four moles of sulphur. Therefore, four moles of sulphur fully react with one mole of methane and three moles of methane leftover.
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Calculate the density of an object that has the mass of 16 grams and takes up 7 cm3 of space.
Explanation:
[tex]density \: = \: mass \: over \: volume \\density \: 16grams \: over \: 7cm {}^{3} \\ density = 2.3g \cm {}^{3} [/tex]
How is the water cycle affected when the sun comes out?
A. Rain Freezes
B. Rain becomes sweet
C. Nothing Happens
D. Rain evaporates
Answer:
option d rain evoporates
Answer:
D. Rain Evaporates
Explanation:
Heat causes liquid and frozen water to evaporate into water vapor gas, which rises high in the sky to form clouds. Clouds move over the globe and drop rain and snow.
Consider a transition of the electron in the hydrogen atom from n=4 to n=7. Determine the wavelength of light that is associated with this transition.
The wavelength that is associated with the transition is 2145 nm.
What is the wavelength?We know that the wavelength can be obtained from the use of the Rydberg equation and we know that the Bohr's mode lets us know that an electron can move from from a higher to a lower energy level.
Let us write;
1/λ = RH(1/[tex]n_{2} ^2[/tex] - 1/[tex]n_{1} ^2[/tex])
λ = wavelength
RH = Rydberg constant
[tex]n_{1}[/tex] = initial level
[tex]n_{2}[/tex] = final level
Then;
1/λ = 1.097 * 10^7 (1/4^2 - 1/7^2)
1/λ = 1.097 * 10^7 ( 0.0625 - 0.020)
λ = 2145 nm
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Which of the following is a true statement about cellular respiration? (4 points) a Cellular respiration occurs only in plant cells. b Cellular respiration occurs only in animal cells. c Cellular respiration occurs in both plant and animal cells. d Cellular respiration occurs in some plant cells and some animal cells.
Answer:
cellular respiration occurs both in plant and animal cells.
Explanation:
Cellular respiration definitely occurs in animals, it is how we break down glucose to get ATP. Plants first use photosynthesis to produce glucose and then need a way to produce ATP, being cellular respiration.