Why do some photons travel right through the atom unchanged while others are absorbed?
A.Only photons of specific frequencies can promote an electronic transition.
B.Only visible light photons can interact with electrons.
C.Only a few photons get deflected by the nucleus since it's only a tiny part of the atom's volume.
D.Only negatively charged photons interact with atoms.
Answers
Only photons of specific frequencies can promote an electronic transition. When a photon interacts with an atom, it can either be absorbed or scattered.
Photons of certain frequencies can cause an electron within the atom to absorb energy and move to a higher energy state, resulting in the photon being absorbed. Other photons, which are not the correct frequency, will not interact with the electrons and will pass right through the atom without being absorbed or scattered. This is because the electrons in an atom can only be promoted to higher energy states by photons of specific frequencies. The energy of the photon must match the energy gap between two energy levels of an atom for the photon to be absorbed. If the frequencies of the incoming photons are too low or too high, the photons will pass through the atom unchanged.
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Related Questions
The pressure in a container is 345 ka at 401 K. The gas is heated until the pressure reaches 505 kPa. What is the final temperature of the gas?
Answers
A gas has a capacity of 34 litres and a temp of 35°C, when it once had a quantity of 28, a temperature of 45°A, and an unknown pressure.
A pressure unit is what?
The Metric unit of pressure, the pascal (abbreviated as Pa), is equal to one thomas per sq meter (Y e or kg m-1s-2). Surprisingly, this name was chosen in 1971.
How is pressure measured?
P = F / A, or force per unit of surface area, is the formula for computing pressure. The sign for pressures in physical science is p, and the SI-derived unit for measuring pressure is the pascal (symbol: Pa). One pascal is equal to one Newton per square meter of force applied perpendicularly on a surface.
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1. The diagram above shows the repeating groups of atoms that make up two samples. Will the
properties of the two samples likely be the same or different? (Examples of properties are smell,
color, and the temperature at which a substance melts.)
Answers
Answer:
Will likely be the same
Explanation:
We can see in both pictures there is a black molecule and a red molecule. However, we also have a purple molecule in one image and a yellow in the other. It would LIKELY be the same because we have more of the same molecules then more different molecules. Hope this helps
what are the two quantities in this module for which we will develop unit factors to do dimensional analysis with chemical substances?
Answers
Mass (often measured in grams) & volume are the two characteristics in this module through which we will create unit components to do statistical approach using different chemicals .
What exactly is a chemical substance?Chemical substances come in three different forms: elements, compounds, and mixtures. Elements are basically chemicals that don't contain any other substances. In this sense, elements are the fundamental constituents of chemical composition.
How should chemicals be categorized?The component can be an isotope or a combination if it is pure. If a substance can be divided into its component elements, it is a compound. If a substance is not chemically pure, it is either a heterogeneous mixture or even a heterogeneous mixture. If the composition remains the same throughout, the combination is homogeneous.
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I need help, please.
Answers
Mass of Barium = 720.73 g ; Mass of Phosphorus = 108.37 g ; Mass of Oxygen = 223.91 g
How to calculate masses?To determine the masses of barium, phosphorus, and oxygen in a sample of barium phosphate (Ba3(PO4)2), you need to calculate the formula weight of the compound and then multiply it by number of moles of compound in the sample.
First, calculate the formula weight of the compound:
Ba3(PO4)2 formula weight = (3 x 137.327 g/mol) + (2 x (30.97 g/mol + 4 x (16.00 g/mol)) = 601.9 g/mol
n = 1053.8 g / 601.9 g/mol = 1.75 mol
Mass of Barium = 3 x 137.327 g/mol x 1.75 mol = 720.73 g
Mass of Phosphorus = 2 x 30.97 g/mol x 1.75 mol = 108.37 g
Mass of Oxygen = 8 x 16.00 g/mol x 1.75 mol = 223.91 g
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when do electrons release photons
Answers
Answer:
Later when they are older
Explanation:
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In an ecosystem, why can only one species fill an ecological niche?
Answers
Answer:
Explanation:es porque las especies con nichos idénticos tienen las mismas necesidades, lo que significa que competirían exactamente por los mismos recursos.
explain how to separate sugar from supersaturated sugar solution
guys pls help
Answers
A “supersaturated” solution contains more dissolved material. supersaturated solutions lies in the temperature of the water. more sugar will dissolve in hot water than in cold. Meaning that by separating the 2, only the supersaturated sugar would dissolve leaving the regular sugar untouched.
You are creating a carbon cycle poster in which direction would you draw arrows to show the movement of carbon through the process of respiration?
A. from the rock to the air
B. from the rock to the grass
C. from the air to the wolf
D. from the wolf to the air
Answers
An unknown substance is a white solid at room temperature and has a melting point of 78 "c. Which of the following substances is most likely to be the identity of
the unknown sample?
Answers
The molecular solid naphthalene had always been the unidentified solid with such a melting point around 78 degrees Celsius.
At normal temperature as well as pressure, an ionic compound would be almost certainly a solid, even though a covalent compound could be a solid, a liquid, or even a gas.
The temperature when a solid can transform into a liquid is known as that of the melting point.
Strong intermolecular interactions have led to greater melting points for some substances, while weakly attractive molecules have lower melting points.
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calculate 28.1g of silicon to moles
Answers
Answer:
2.53•10^23 atoms
Explanation:
23 is the exponent btw
3. Determine the number of molecules of ethanol (C2H5OH) in 47.0g
Answer with explanation plsssss.
Answers
Answer:
6.14x10^24
Explanation:
convert the given 47.0g to mols then to molecules.
\(\frac{47.0g}{} x\frac{1mol}{46.07g}x\frac{6.022x10^{23} }{1 mol}\)
46.07 is the molar mass of ethanol
6.022x10^23 is avogadros number
How much heat energy is required to heat a 100 g sample of liquid water from 30 °C to water vapor at 110 °C?The specific heat of liquid water is 4.184 J/(g K) and water vapor is 2.008 J/(g K). The heat of vaporization for water is 2259 J/g and the heat of fusion is 334.72 J/g
Answers
The total heat energy required is expressed according to the formula:
\(\begin{gathered} Q_T=Q_{\text{vap,w}}+Q_w \\ \end{gathered}\)where:
Qvap is the heat energy absorbed by the vapor
Qw is the heat energy absorbed by the water
Get the heat energy absorbed by the vapor at 100 degrees
\(\begin{gathered} Q_{\text{vap,w}}=n_w\times\triangle H_{vap,w} \\ Q_{\text{vap,w}}=\frac{mass}{molar\text{ mass}}\times\triangle H_{vap,w} \\ \end{gathered}\)Given the following parameters;
Mass of water = 100g
Molar mass of water (H2O) = 18.015g/mol
Hvap,w = 2259 J/g = 40.8 kJ/mol
Substitute the given parameters into the formula to have:
\(\begin{gathered} Q_{\text{vap,w}}=\frac{100\cancel{g}}{18.015\cancel{g}\cancel{\text{mol}^{-1}}^{}}\times\frac{40.8kJ}{\cancel{\text{mol}}} \\ Q_{\text{vap,w}}=226.48kJ \end{gathered}\)Get the heat absorbed by the water from 30 to 100 degrees and from 100 to 110 degrees using the formula below. Note that the water vapor is being heated without any phase changes, so we will be utilizing the specific heat capacity of water vapor.
\(\begin{gathered} Q_w=m_wc_w(\triangle\theta)_w+m_wc_w\triangle\theta \\ Q_w=(100\times4.184\times(100-30))+(100g\times2.008\frac{J}{g^oC}\times(110-100)^oC) \\ Q_w=(100\times4.184\times70)+(100\times2.008\times10) \\ Q_w=29,288+2008 \\ Q_w=31296\text{Joules} \\ Q_w=31.296kJ \\ \end{gathered}\)Get the total heat energy required;
\(\begin{gathered} Q_T=226.48kJ+31.296kJ \\ Q_T=257.776kJ \end{gathered}\)An air plane is flying at a crusing speed of 200 miles per hour for 3 hours. How far would the plane fly?
Answers
consider the following questions about polyprotic acids and determine if each statement is true or false. for polyprotic acids ka1 is typically much smaller than ka2 for most polyprotic acids, each proton dissociation can be looked at separately for most polyprotic acids all ka values must be considered to determine the ph of the solution
Answers
For polyprotic acid ka1 is greater than ka2 , each proton dissociation can be looked at sepatertely and all the ka values must be not considered to determine the PH.
Polyprotic acids is a substance capable of donating more than one proton. Di protic and tri protic are the one capable of donating two o three proton,respectively.
For polyprotic acid ka1 is smaller than ka2 is not correct. for polyprotic acid ka1 is greater than ka2 as they have tendency to give off more than one H+ ion.
The proton dissociation can be looked at separately for most polyprotic acid is correct . each proton dissociation can be look at separately.
All ka values must be consider to determine the PH of solution is not correct.we can use ka1 as an approx because ka2 is considerably smaller no.
Thus, for polyprotic acid ka1 is greater than ka2, each proton dissociation can be looked at separately and all the \(K{a}\) values must not be considered to determine the PH.
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how is bacteria on mars counted as life but a heartbeat on earth is not?
Answers
Oxidizing acids, such as nitric acid, can explode when mixed with what type of incompatible chemical
Answers
Oxidizing acids can explode when mixed with incompatible chemical such as alcohols, turpentine, charcoal, organic refuse.
Why Oxidizing acids can explode when mixed with incompatible chemical?Oxidizing acids reacts violently with combustible such as alcohols, turpentine, charcoal, organic refuse because when it reacts with most metals, it release hydrogen gas in the air.
So we can conclude that Oxidizing acids can explode when mixed with incompatible chemical such as alcohols, turpentine, charcoal, organic refuse.
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carbondiooxide does not support in burning but mg burs in it why.?
Answers
To keep burning, fires require oxygen. Carbon dioxide is used in certain fire extinguishers to put out flames. Explanation: Because magnesium is higher on the reactivity scale than carbon, it is more reactive and eliminates oxygen from carbon dioxide (to give carbon and magnesium oxide).
giải gấp giúp em câu này với ạ:
a) Hoàn thành các phan ứng sau dưới dạng phương trình phân tử và phương trình ion thu gọn:
- CaCO3 + HCl =>
- Fe(SO4)3 + NaOH =>
- KCl + ? => KNO3 + ?
- Na2S + H2SO4 =>
b) Viết PTPU của các phương trình ion thu gọn sau, xác định chất nào là acid, chất nào là bazo:
- H(+) + OH(-) => H2O
- OH(-) + HCO3(-) => CO3(2-) + H20
Answers
Explanation:
what do you have written I can't understand one word right a properly
An acetylene cylinder is filled with a monolithic filler and acetone before acetylene gas is pumped into it.
a. true
b. false
Answers
The statement "An acetylene cylinder is filled with a monolithic filler and acetone before acetylene gas is pumped into it." is True. When storing acetylene gas, it is commonly done in specialized cylinders to ensure safety.
These cylinders are designed to contain the acetylene gas at high pressure. Prior to filling the cylinder with acetylene gas, a monolithic filler material, often porous material like diatomaceous earth, is placed inside the cylinder. The purpose of the filler material is to provide a large surface area for the acetone to be absorbed.
Acetone is then added to the cylinder. Acetone has the ability to dissolve acetylene gas more effectively than plain gas alone. It acts as a solvent and helps to stabilize the acetylene gas inside the cylinder. The presence of acetone ensures that the acetylene gas is stored safely and prevents it from becoming unstable or explosive.
Once the monolithic filler and acetone are in place, the cylinder is ready to be filled with acetylene gas. The gas is pumped into the cylinder, and due to the properties of the filler and acetone, it is absorbed and stored within the cylinder. This process allows for the safe transportation and storage of acetylene gas, reducing the risk of accidents or explosions associated with this highly reactive gas.
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as the temperature of an air mass increases, its volume ______ and density decreases.
Answers
As the temperature of an air mass increases, its volume increases, and its density decreases.
This is because warm air expands and takes up more space since its molecules move more quickly and widely. Although the volume has increased, the density has decreased since the same amount of air is now dispersed across a greater area. On the other hand, when air is chilled, its molecules slow down and close in on one another, which causes the air to constrict and increase in density.
Variations in air temperature and density can have a significant impact on weather and climate because they can alter how air masses behave, how clouds develop, and how air currents flow. So, understanding the relationship between temperature and density is crucial for forecasting and comprehending weather patterns as well as for making decisions regarding topics like air pollution and climate change.
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The molarity of a NaOH solution was determined by titration with KHP. The results of five titrations were 0.1025 M, 0.1087 M, 0.1100 M, 0.1052 M, 0.0997 M. Answer the following questions based on 95% confidence level.
a) Calculate the absolute standard deviation of the concentration of NaOH.
b) Calculate the standard error of the concentration of NaOH.
c) Calculate the confidence interval of the concentration of NaOH. Report your answer with appropriate significant figures
d) If the true concentration of this NaOH solution is 0.1045 M, is the sample mean significantly different from the true concentration?
e) Another student also measured the concentration of the same NaOH solution. The result of the three titrations were 0.1028 M, 0.1012 M, 0.0983 M. Are the mean concentrations from the two students’ result similar to each other?
Answers
a) The absolute standard deviation of the concentration of NaOH is 0.0041 M.
b) The standard error of the concentration of NaOH is 0.0018 M.
c) The confidence interval of the concentration of NaOH is (0.1033 M, 0.1060 M).
d) Yes, the sample mean is significantly different from the true concentration of 0.1045 M.
e) No, the mean concentrations from the two students' results are not similar to each other.
a) To calculate the absolute standard deviation of the concentration of NaOH, we need to find the standard deviation of the given data points. Using the formula for sample standard deviation, we calculate the average deviation of each data point from the mean concentration, then square each deviation, take the average of the squared deviations, and finally, take the square root. The absolute standard deviation is the absolute value of the standard deviation.
b) The standard error of the concentration of NaOH measures the variability of the sample means from different samples. It is calculated by dividing the standard deviation by the square root of the sample size. In this case, the sample size is 5.
c) To calculate the confidence interval of the concentration of NaOH, we need to determine the margin of error using the t-distribution and the sample standard deviation. With a 95% confidence level, we use a t-value corresponding to 4 degrees of freedom (n-1) and multiply it by the standard error. The confidence interval is constructed by subtracting and adding the margin of error to the sample mean concentration.
d) To determine if the sample mean is significantly different from the true concentration, we compare the true concentration to the confidence interval. If the true concentration falls outside the confidence interval, then the sample mean is significantly different from the true concentration.
e) To assess if the mean concentrations from the two students' results are similar to each other, we can calculate the confidence intervals for each student's data. If the confidence intervals overlap or are close to each other, it suggests that the mean concentrations are similar. However, if the confidence intervals do not overlap, it indicates that the mean concentrations are likely different.
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Finding evidence to support or disprove
is
how science advances
Answers
Answer:
Scientific investigations discover evidence that helps science advance, and the purpose of scientific investigations generally is to test hypotheses. Finding evidence to support or disprove hypotheses is how science advances.
Explanation:
A chemical reaction takes place in a closed system. The mass of the reactants before the reaction was 35 grams. What must the mass of the products of the reaction be, according to the law of conservation of mass?
Answers
Pls help if u cannn rlly need help!!
Answers
The action on the system that will help overcome the strong attraction between molecules in the liquid would be increasing the temperature of the system.
Overcoming attractive forces in liquid moleculesIncreasing the temperature of the system is the action that is most likely to overcome the strong attraction between molecules in a liquid.
At higher temperatures, the molecules in a liquid will have more kinetic energy and move faster, which will weaken the intermolecular forces between them.
This can ultimately lead to a phase transition from liquid to gas, where the intermolecular forces are completely overcome and the molecules are free to move independently.
Conversely, decreasing the temperature of the system will strengthen the intermolecular forces and make it harder to overcome them, leading to a phase transition from liquid to solid.
Increasing the pressure or decreasing the volume of the system will have a negligible effect on the intermolecular forces in the liquid.
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What is occurring when reactants are mixed and heated and liquid collects in the sidearm of the apparatus
Answers
When reactants are mixed and heated and liquid collects in the sidearm of the apparatus, a chemical reaction is occurring.
What is a chemical reaction?A chemical reaction is said to occur when reactants are combined to form products. We must note that the formation of products is evidenced by;
Appearance of a liquidAppearance of a gas Appearance of a solidHence, when reactants are mixed and heated and liquid collects in the sidearm of the apparatus, a chemical reaction is occurring.
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what is the definition of toxicity?
Answers
Answer:
The level of toxins in solutions
Answer:
The definition of toxicity is: the quality of being toxic or poisonous.
What element has the noble gas configuration [Ar]4s23d8
Answers
Answer:
argon
Explanation:
Answer:
Argon
Explanation:
what is NOT a function of the Digestive System
Answers
The digestion system does:
Ingestion, the process of eating
Mechanical digestion, the process of physically breaking food down
Etc
Basically anything that isn’t digesting/absorbing food
Bonds payable to whomever holds them are called _____ bonds or unregistered bonds.
Answers
Bonds payable to whomever holds them are called bearer bonds or unregistered bonds.
What is bearer bond ?Bonds that have no registered owners are known as bearer bonds. Instead, the bond is owned by whoever "bears" (or has possession of) it. Bearer bonds, sometimes known as coupons, have coupons that bondholders can detach and present to receive interest payments.
What are interest payments ?An interest rate is the amount of interest that is payable each period stated as a percentage of the amount that was lent, deposited, or borrowed. The principal amount, interest rate, frequency of compounding, and duration of the loan, deposit, or borrowing determine the total amount of interest on a sum that was lent or borrowed.
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Provide a term that matches each description below.
a The agreement between several measurements of the same quantity
b Ratio between the mass and volume of a substance.
c In a series of measurements of the same quantity, one that is significantly different from the others.
d Mathematical value reported when a quantity is measured multiple times
e Term describing two liquids that do not mix together.
Answers
a. Consistency is a term that matches the description: The agreement between several measurements of the same quantity.
b. Density matches the description: Ratio between the mass and volume of a substance.
c. Outlier matches the description: In a series of measurements of the same quantity, one that is significantly different from the others.
d. Mean matches the description: Mathematical value reported when a quantity is measured multiple times.e. Immiscible is a term describing two liquids that do not mix together.
Definition: Immiscibility is the property of not being miscible. When two or more liquids are not able to form a homogeneous solution when combined, they are immiscible. The term "miscible" refers to the property of being mixed. Therefore, immiscible liquids cannot be mixed together or dissolved in one another.
Limiting reagent (also known as limiting reactant) is a chemical reaction term that refers to the substance that limits the quantity of product that can be formed in a chemical reaction. It is the substance that is entirely consumed first, preventing the other reactants from reacting further. The amount of product generated is determined by the quantity of the limiting reagent. In a chemical reaction, the quantity of the product produced is determined by the limiting reactant, and the rest of the excess reagents will remain unchanged.
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