C) Plant roots growing through concrete and splitting it.
How do you obtain the absorbance value at a selected wavelength for the absorbance spectra of each of the solutions that you prepare?.
The absorbance value at a selected wavelength for the absorbance spectra of each of the solutions can be determined by using Beer's law.
What is Beer's law?
According to Beer's rule, the absorbance is inversely proportional to the concentration of the absorbing substance at constant route length. When an is a constant that depends on the medium, the absorbing substance, and the light's wavelength, and b is the path length, C is the concentration (solvent and other components).
The absorbance value for each spectrum is calculated at a certain wavelength. In general, it is desirable to choose a wavelength where the absorbance is at its highest because this will reduce the measurement's relative inaccuracy. The next step is to create a Beer's Law plot showing absorbance vs. concentration.
Hence using the Beer's law we can easily calculate the absorbance value at a selected wavelength for the absorbance spectra of each of the solutions that we prepare.
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a(n) is a list collection has elements that are ordered by a characteristic of the elements.
A ordered list is a list collection has elements that are ordered by a characteristic of the elements.
What is an element ?A material that cannot be converted into some other substance is known as an element. Each of the 120 elements has a unique form of atom. Atoms from at minimum one or more elements is present in everything in the cosmos. All known elements are listed in the periodic table, with those that have related properties being grouped together.
What materials make up elements?Particles are the basic building block of all elements. Protons, neutrons, and electron make up atoms. A mixture can be created by combining two different types of elements. The molecule is indeed a group of atoms that can't be separated from the bigger substance it is a component of while still keeping its characteristics.
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How much is one ounce of the element Radon (Rn) Please help!!!!!!!
The quantity of Radon (Rn) found in one ounce of the element = 28.35g
What is Radon (Rn)?Radon (Rn) is defined as the element found in the periodic table with the atomic number of 86 and molecular atomic mass of 222g.
The molar mass of the element Radon (Rn) = 222g.
But 1 ounce= 28.35 grams
X ounce = 222gramms
Make X the subject of formula;
X ounce = 222/28.35
= 7.8 ounce.
That is to say that, 7.8 ounce of Radon= 222g,
28.35 grams of Radon = 1 ounce.
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What is the formula for ethanol according to this illustration?
Question 10 options:
A.C2OH6
B.COH2
C.C2O
D.C2OH
Answer:
[tex]{ \sf{C _{2} H_{6} O}}[/tex]
What is the ratio of argon-40 to potassium-40 two half-lives
after the rock has formed?
The ratio of argon-40 to potassium-40 two half-lives after the rock has formed is 7:1.
The half-life of a radioactive compound tells us the time needed for half of the atoms of any compound to go through the radioactive decay.
We know that, half-life of potassium-40 is 1.25 billion years because this is how long it takes for half of the number of atoms which are present in the sample to decay to argon-40.
The half-life of potassium-40 which decays by the beta emission is 1.28 × 10⁹ years. The half-life of potassium-40 which decays by the positron emission is 1.19 × 10¹⁰ years.
40 K which naturally occurs decays to the stable 40 Ar which is 11.2%, It happens by the capture of electron and by positron emission. It gets decayed to stable 40 Ca (88.8%) by emission of negatrons. Half-life of 40 K 1.25 x 10⁹ years.
The dating method of potassium-argon is specifically useful in determining the Lava age.
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Explain why the sulfide ion (S²⁻) is larger than the chloride ion (Cl⁻).
Optional question (if you know the answer): Which atom/ion has the larger ionic size Li or Li₊
The sulfide ion (S²⁻) is larger than the chloride ion (Cl⁻).
According to the question , sulfide ion (S²⁻) is larger than the chloride ion (Cl⁻) . the atomic number of sulfur 16 and chlorine is 17
sulfur .
atomic number of sulfur is 16,
now, S²⁻ = 18 electrons
Cl⁻ = 18 electrons
The no. of electrons in S²⁻ and Cl⁻ are same 18 electrons. But S²⁻ ion has one proton less than Cl⁻ ion. So, the attractive force between the nucleus and electron is more that's the reason Cl⁻ ion is smaller than S²⁻
Thus , the sulfide ion (S²⁻) is larger than the chloride ion (Cl⁻).
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Which statement best describes the effect of low ionization energies and low electronegativities on metallic bonding?
The statement best describes the effect of low ionization energies and low electronegativities on metallic bonding is : Delocalization of the valence electrons is simple.
What is ionization energy ?
Ionization energy, also known as ionization potential, is the amount of energy needed to remove an electron from an isolated atom or molecule in physics and chemistry.
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For sn1 solvolysis of t-butyl chloride, rank the solvents from fastest reaction to slowest reaction.
Fastest: water.
Slowest: Acetic acid
What is sn1 reaction?
In organic chemistry, the SN1 reaction is a substitution reaction. Its name comes from the Hughes-Ingold symbol that shows how the reaction works. "SN" stands for "nucleophilic substitution," and "1" means that the step that controls the rate is unimolecular.
What is solvolysis?
Solvolysis is a chemical reaction in which the solvent, such as water or alcohol, is one of the reagents and is present in excessive amounts.
Hence, the Fastest: water formic acid methanol ethanol acetone
Slowest: Acetic acid
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The difference between Ionic bond and Covalent bond.
The difference between an ionic bond and a covalent bond is that ionic bod are made regardless if atoms are metal or nonmetal, while covalent bonds always are generated between non-metals atoms.
What is a covalent bond?A covalent bond is a chemical bond between two atoms that are non-metals such as between hydrogen and oxygen atoms, while ionic bonds involve metals and non-metal atoms one example of this type of bond is the NaCl sodium chloride.
Therefore, with this information, we can conclude that ionic and covalent bonds are distinct due to the atoms that form the chemical bond.
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6.25 moles of magnesium to grams
1) Substance: Magnesium.
[tex]Mg[/tex]2) Convert moles of magnesium to grams of magnesium.
The molar mass of magnesium is 24.3050 g/mol.
[tex]g\text{ }Mg=6.25\text{ }mol\text{ }Mg\ast\frac{24.3050\text{ }g\text{ }Mg}{1\text{ }mol\text{ }Mg}=151.91\text{ }g\text{ }Mg[/tex]6.25 mol Mg is equal to 151.91 g Mg.
.
gas sample is made entirely of carbon dioxide and water, and there are 259 moles of co2 and 513 moles of water. if the total pressure of the sample is 21 atm, what is the partial pressure of each gas?
Partial pressure of CO2 , p'=7.0455 atm and Partial pressure of water p ''=13.9545 atm
No. of moles of CO2 , n' = 259 moles
No. of moles of water , n'' = 513 moles
Total no. of moles , n = 513+259
= 772 moles
Mole fraction of CO2 , X' = n' / n
= 0.3355
Mole fraction of water , X'' = n'' / n
= 0.6645
Partial pressure of CO2 , p' = X' * total pressure
= 0.3355 * 21
= 7.0455 atm
Partial pressure of water , p '' = X'' * total pressure
= 0.6645 * 21
= 13.9545 atm
The force perpendicularly applied to an object's surface divided by the area over which it is dispersed is known as pressure. The pressure as compared to the surrounding air pressure is known as gauge pressure. To express pressure, a variety of units are employed. The tension or pressure that is applied uniformly across a confined fluid is known as hydrostatic pressure (liquid or gas). In a fluid at rest, there is no other tension conceivable. Look at the Pascal's principle. In the Earth's crust, there is a pressure called lithostatic pressure that is similar to hydrostatic pressure in fluids. It is the stress that surrounding rocks place on a body of rock.
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Why do Alkaline batteries eventually stop working & why cant they be recharged?
Answer:
Alkaline do not conduct electricity so they can't be recharged
Explanation:
base don't conduct electricity
Dropbox Assignment
A Hidden Champion
Hidden champion is a term that was coined by a German business consultant, Hermann Simon. A hidden champion is a small to medium-sized company that is narrowly focused on a small, highly specialized market. Such companies are usually not well known yet are very profitable. One example of a hidden champion is the French company Essilor.
Staying the Course
Essilor manufactures ophthalmic lenses, which is the formal name for contact lenses and lenses for eyeglasses. Over the years, Essilor has reinforced its single focus and avoided branching out into eyeglass retailing. Instead, the company concentrated its effort on going global. Today, Essilor is the industry's leader. Besides staying specialized and having a clear strategy, Essilor kept innovations coming. For example, Essilor invented progressive lenses. These alternatives to bifocal lenses have a gradual change in correction power from top to bottom. Like most other hidden champions, Essilor invests a notable four to five percent of its annual sales on research and development. Other characteristics of hidden champions include tight financial management, superior customer service, and foresight.
How would you evaluate this hidden champion based on the 4 functions of business we learned in this lesson? Submit your complete evaluation to the dropbox titled: Business Opportunities
Nearly thirty years ago, Professor Hermann Simon was the first to introduce the term "hidden champions."
What unheralded German heroes exist today?A strange event in Germany. Privately held businesses known as "hidden champions" have excelled to amazing degrees of success while maintaining a very low profile in society, sometimes not even in Germany.
Many extremely successful businesses go unrecognized by individuals in the media, in research, or in the improvement industries, according to Professor Hermann Simon, who first used the term "hidden champions" about thirty years ago (consultants).
How many so-called "hidden champions" exist in the world?the psychological dimensions of monetary success and the effects of capitalism on society. Germany is home to over half of the 2,700 very profitable businesses dubbed "hidden champions."
The great majority of people have never heard of them, in contrast to large companies that are listed on public markets.
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Who first developed a mathematical expression to relate the visible wavelengths of light emitted by the hydrogen atom?.
Answer:
Niel Bohr in 1913.
Niel conducted experiments with Hydrogen atoms and tried to correlate their emission spectrum with the "atomic fingerprint" he would get for the atom.
Unfortunately, his calculations only worked on the Hydrogen atom.
**Bohr constructed the Bohr model, which is the structural model of an atom.
1.) what is the name of NaF formula
Answer:
[tex]\text{Sodium Fluoride}[/tex]
Explanation:
Here, we want to get the name for the given chemical formula
Looking at the formula, we look at the names of the element
The names are sodium and fluorine
We write the name of the metal element first, then the non-metal atom
Thus, we have it as
[tex]\text{Sodium Fluoride}[/tex]in what year and location did direct measurements begin to be taken of earth's atmospheric carbon dioxide? has co2 been increasing or decreasing since then?
C. David Keeling of the Scripps Institution of Oceanography started monitoring at a NOAA weather station in March 1958. In May 1974, NOAA began conducting its own separate and supplementary CO2 measurements.
In 1950, why did CO2 levels rise?Then, in the 1950s, a sharp rise in the burning of fossil fuels—coal for power and steel production, oil for transportation, and natural gas for heating—dramatically boosted the rate of CO2 emissions into the atmosphere.
Since observations started in 1958, the amount of carbon dioxide (CO2) in the air at the Mauna Loa observatory in Hawaii has grown by more than 25%.
The average global CO2 concentration varied during the 800,000 years for which we have records, between 170 ppm and 280 ppm. Things changed quickly as people began to consume fossil fuels throughout the industrial age. The amount has only surpassed 300 ppm during the industrial period.
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The station's average monthly carbon dioxide observations since 1960 are depicted in his graph as parts per million. (ppm).
What the body experiences from carbon dioxide?Numerous health effects from CO2 consumption might be observed. These indications can include a coma, hypoxia, convulsions, sweating, a tingling or pins-and-needles sensation, migraines, disorientation, agitation, a tingling and fasteners feeling, and difficulty breathing.
How is carbon dioxide produced?Carbon dioxide (CO2) is produced from both natural (such as volcanoes, animal breath, and plant degradation) as well as anthropogenic sources (primarily the burning of fossils fuels like coal, oil and natural gas to generate energy).
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What is the answer to the question???
Answer:
7 valence electrons.
would be needed
Consider the following reaction at eqilibrium. What effect will removing H2O have on the system?
2 H2S+3 O2---> 2 H2O+ 2 SO2
a.The reaction will shift to the left
b. No change will be observed
c. The equilibrium constant will decrease
d. The equilibrium constant will increase
e. The reaction will shift in the direction of the products
The correct answer is option e, which says, The reaction will shift in the direction of the products on removing H₂O from the system.
According Le Chatelier's principle,
If the equilibrium of a chemical reaction system is disturbed by changing any property of the system, then the reaction will shift itself towards a that side which will reestablish the equilibrium of the system.
So, in the reaction,
2H₂S + 3O₂ → 2H₂O + 2SO₂
If we remove H₂O from the system, then the concentration of the product side will become less and the equilibrium of the reaction will get disturbed.
To compensate for the loss of the concentration of the product, the system will need more amount of H₂O to establish the equilibrium.
So, to make more products, more reactants would react with each other to form more amount of H₂O.
It means the reaction will shift towards right or we can say the reaction will shift towards the products side.
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Which can be excluded from a list of objects in the solar system?(1 point)
planet
constellation
asteroid belt
sun
Answer:
The answer is a constellation
the half-life of radium-225 is 14.9 years. what is the annual decay rate? express the result to four decimal places.
The annual decay rate for the radium-225 having a half life of 14.9 years is 0.0465 year⁻¹
How do i determine the decay rate?We know that half life is the time taken for half of a substance to decay.
The half life of a substance is related to the decay rate according to the following formula:
Decay rate (λ) = 0.693 / Half life (t½)
λ = 0.693 / t½
With the above formula, we can obtain the decay rate as illustrated below:
Half-life radium-225 (t½) = 14.9 yearsDecay rate (λ) =?Decay rate (λ) = 0.693 / Half life (t½)
Decay rate (λ) = 0.693 / 14.9 years
Decay rate = 0.0465 year⁻¹
Thus, we can conclude that the decay rate is 0.0465 year⁻¹
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PLEASE HELP PLEASE PLEASE
Solid Strontium hydroxide reacts with Acetic acid to form…?
Follow these steps:
a. Identify the type of reaction
b. Predict products for formula
c.balance the equation
Sort the Physical Properties of Metals, Nonmetals, and Metalloids I will mark the brainiest
Answer:
Metals: Malleable, Conductor, Ductile, Luster
Nonmetals: Insulator, Brittle, Dull
Metalloids: Properties of BOTH Metals & Nonmetals
Compare the codes listed at the top of each drawing in Model 1 with the shapes in that box.
What do the letters R, Sq, and T in the codes represent?
What do the small numbers (subscripts) in the codes represent?
When atoms are touching, how is that communicated in the code?
What is the common characteristic of the samples in which an ampersand (&) is used?
In Model 1 there are three drawings that are labeled with a question mark. Write codes
properly label these drawings.
POGILT Activities for High School Ch-
a) R = square; Sq = round. Triangle = T. b) The little numbers (subscripts) in the codes indicate how many of a certain sort of atom there are in a given molecule.
What do the letters R sq and T in the codes stand for?Compare the forms in that box with the codes stated at the top of each design in Model 1. molecule.
a) What do the codes' letters R, Sq, and T stand for? R=Round. Sq Square T=triangle (atoms) (atoms).
b) The small numbers (subscripts) in the codes indicate how many atoms of a certain kind are present in molecule.
What is an element's one- or two-letter code?A one- or two-letter identifier of an element is known as a chemical symbol. The chemical symbols O for oxygen, Zn for zinc, and Fe for iron are a few examples.
A symbol's first letter is usually capitalized. The second letter of a symbol that has two letters is lowercase.
b) In the illustrations of Model 1, what does it signify when two atoms or molecules are not in contact? In the sample, the atoms or molecules are not bound to one another; instead, they are merely positioned near to one another.
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in a second trail, the student accidentally added more naoh(aq) to the flask than was needed to reach the end point, and then recorded the final volume. would this error increase, decrease, or have no effect on the calculated acid concentration for the second trial? justify your answer.
Error increase on the calculated acid concentration for the second trial.
What is titration?By comparing an unknown solution to one with known concentration, a titration can be used to determine the concentration of the unknown solution. The titrant (the known solution) is normally added from a burette to a known volume of the analyte until the reaction is complete (the unknown solution).
If a little more NaOH solution was added, the color of the solution in the flask would become noticeably darker. Due to its sudden appearance, the endpoint must be avoided at all costs. A final volume is read from the burette once the titration reaches the endpoint. A final volume is read from the burette once the titration reaches the endpoint.
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a metal and nonmetal that have a large difference in electronegativity values will experience what type of bond?
Answer:
Explanation:
In a diatomic molecule with two identical atoms, there is no difference in electronegativity, so the bond is nonpolar or pure covalent. When the electronegativity difference is very large, as is the case between metals and nonmetals, the bonding is characterized as ionic.
Answer:
ionic
Explanation:
When the electronegativity difference is very large, as is the case between metals and nonmetals, the bonding is characterized as ionic.
Latent heat of vaporization of a substance, if 100 J converts 6 g of the substance from liquid to gaseous state, would be
We could use the following equation in order to solve this problem:
Replacing our values, we obtain:
The answer is 16.7J/g.
Why is the atomic radius trend related to the electronegativity trend?
Here is the Answer I Hope this Helps:-
The closer the electrons are to the nucleus, the more tightly they are bound, thus increasing the electronegativity of the atom.
An electrical drill has 100 J of chemical energy. Of the 100 J, 45 J are transformed into kinetic energy and 20 J are transformed into sound. The remaining energy is given off as thermal energy.
What is the thermal energy of the drill?
J
As per law of conservation of energy, the thermal energy of the drill is 35J.
Total energy = Kinetic energy + Sound energy+ Thermal energy
100 = 45+20+ Thermal energy
Thermal energy = 35J
The law of conservation of energy states that energy can neither be created nor destroyed -only converted from one shape of power to any other. because of this a system continually has the same amount of energy, until it's introduced from the out of doors.
The longer we go without making large modifications, the greater the chance of global warming and weather exchange grow to be in our daily lives. whilst we burn fossil fuels, they invent a terrific quantity of greenhouse gasoline emissions.
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Answer:
The answer above is correct! It's 35J :)
Explanation:
Just did it on Edge!
Hope this helped - brainliest would be very much appreciated!
Have a great day :D
2) How many cm are there in 4.5 feet?
Know:
feet
4.5 feet
1
X
X
Goal:
? Centimeters
=137.16 =137.161
cm
Answer:
Just add times one
Explanation:
There are 30.48 cm in one foot so if you time 30.48 x 4.5 you should get your answer
Most air-conditioned
rooms are set to a temperature of about 22°C.
Human body temperature is 37°C. Why don't
people in an air-conditioned room come to
thermal equilibrium with the room?
Just its "target temperature," not the temperature of the wind it blew, is what you select as the "air conditioning temperature."
When the air conditioner is set to "23°C cooling," it will blast air that is cooler than 23°C.
(For instance, no matter what temperature you set your air conditioner to, whether it is 18°C or 28°C, it must always be 13°C when cooling.) Until the temperature control determines that the current temperature is below 23°C, it won't stop operating.
When the setting is set to "23°C heating," however, the air conditioner will blow a 40°C hot breeze until the temperature control detects a temperature of 23°C, at which point it will shut off.
What you choose as the "air conditioning temperature" is just its "target temperature," not the temperature of the wind it blew.
The air conditioner will blow air that is colder than 23°C when it is set to "23°C cooling."
(For instance, your air conditioner must always be set to 13°C when cooling, regardless of whether the temperature is 18°C or 28°C.) The temperature control won't turn off unless it determines that the ambient temperature is below 23°C.
However, when the temperature control is set to "23°C heating," the air conditioner will produce a 40°C hot breeze until it registers 23°C, at which time it will turn off.
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