Which of the following occurs as the frequency of a photon decreases? (Select all correct answers)The speed decreases.The energy decreases.The wavelength increases.The speed increases.The energy increases.The wavelength decreases.

Answer:

the observation of the third option is correct one.

Answer: 1. 140.9 g Cl

2. 63.58 g O

Explanation:

According to avogadro's law, 1 mole of every substance occupies 22.4 L at STP and contains avogadro's number \(6.023\times 10^{23}\) of particles.

To calculate the moles, we use the equation:

\(\text{Number of moles}=\frac{\text{Given atoms}}{\text {avogadro's number}}\)

1. \(\text{Number of moles of Cl}==\frac{2.393\times 10^{24}}{6.023\times 10^{23}}=3.973moles\)

1 mol of Cl weighs = 35.5 g

Thus 3.973 mol of Cl weighs = \(\frac{35.5}{1}\times 3.973=140.9g\)

2. \(\text{Number of moles of O}==\frac{2.393\times 10^{24}}{6.023\times 10^{23}}=3.973moles\)

1 mol of O weighs = 16 g

Thus 3.973 mol of O weighs = \(\frac{16}{1}\times 3.973=63.58g\)

A LOAEL is defined as the lowest dose that demonstrates a significant increase in an observable adverse effect. The term LOAEL stands for "Lowest Observed Adverse Effect Level."

When testing chemicals and other substances for toxicity, the goal is to determine the concentration or dose at which adverse effects begin to appear. The LOAEL is the lowest dose at which an adverse effect is observed. This value can be used to establish a safe level of exposure to a substance.
To determine the LOAEL, a series of tests are conducted in which different doses of the substance being tested are administered to test animals. The animals are observed for any adverse effects, such as changes in behavior, weight loss, or organ damage. The lowest dose at which an adverse effect is observed is the LOAEL.
It is important to note that the LOAEL is a relative measure of toxicity. It only provides information on the dose at which an adverse effect is first observed and not on the severity of the effect. In addition, the LOAEL may vary depending on the species tested and other factors.
In summary, the LOAEL is the lowest dose at which an observable adverse effect is detected. This value is used to establish a safe level of exposure to a substance.

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Ethyl methanesulfonate (EMS) is typically known to induce point mutations and transition mutations.

Point mutations are mutations that affect a single nucleotide in the DNA sequence. They can result in the substitution of one nucleotide for another, leading to changes in the encoded amino acid and potentially affecting the function of the encoded protein.

Transition mutations are a type of point mutation where a purine (adenine or guanine) is replaced by another purine or a pyrimidine (cytosine or thymine) is replaced by another pyrimidine. This results in changes within the DNA sequence that can affect the coding of the protein.

EMS is a chemical mutagen that acts by alkylating the DNA molecule and introducing changes in the DNA sequence. The types of mutations induced by EMS are predominantly transition mutations, which are due to the ability of EMS to alter the purine bases (adenine and guanine) in DNA.

Therefore, EMS is typically known to induce point mutations and transition mutations, but not missense mutations.

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Answer:

The correct answer is liquid B.

Explanation:

Latent heat of vaporization also known as the latent heat of evaporation. This latent heat transforms the particles of liquid into a gas without affecting its temperature. For example, the latent heat of evaporation for water is 40.8 kJ per mole, that is, 40.8 kJ per mole of heat is needed to transform water into vapor at 373 K.  

It is known that latent heat of evaporation of a liquid is directly proportional to the cooling effect it generates, that is, more the latent heat of evaporation more will be its cooling effect. Thus, it is clear that liquid B will show the more cooling effect as the latent heat of evaporation of liquid B is more in comparison to liquid A. Thus, more heat will be captivated by liquid B and will generate more cooling effect in comparison to liquid A.  

Answer:

Carbon, in all its states of matter.

Explanation:

The correct balanced half equation for the reduction reaction in the unbalanced equation NO2−​(aq) + Cr3+(aq) → Cr2+(aq) + NO3−​(aq) is Cr3+(aq) + e− → Cr2+(aq).

To determine the correct balanced half equation for the reduction reaction, we need to consider the change in oxidation states of the species involved in the reaction. In the unbalanced equation, we can see that the Cr3+ ion is being reduced to Cr2+. The reduction half equation represents the gain of electrons by the species being reduced. In this case, the Cr3+ ion is gaining one electron to become Cr2+. Therefore, the balanced half equation for the reduction reaction is Cr3+(aq) + e− → Cr2+(aq).

It is important to note that the balanced half equation should ensure that the total charge and the number of atoms are conserved on both sides of the equation. In this case, one electron is added to the Cr3+ ion on the left side to balance the charge and form the Cr2+ ion on the right side.

The other options given in the question do not correctly represent the reduction half equation. The option NO2−​(aq) + H2​O(l) + 2e− → NO3−​(aq) + 2H(aq)−​ represents the reduction of nitrite ion (NO2−), not the reduction of the Cr3+ ion. Similarly, the option NO2−​(aq) + H2​O(l) + 2e− → NO3−​(aq) + 2H(aq) represents the oxidation of nitrite ion, not the reduction of Cr3+.

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Explanation:

They allow the bonds between oxygen and hydrogen to be single. They increase the partial positive charge on the oxygen atom. They counter the uneven pull on electrons between the atoms.

Specific gravity is the "heaviness" of a mineral. It is defined as a number that expresses the ratio between the weight of a mineral and the weight of an equal volume of water.

Answer:

The ratio of it's mass of an equal volume of water.

Explanation:

Answer:

1kg/ml

Explanation:

Answer:

Yes,

Chemical Reactivity of metals decrease as you go left to right of the periodic table Chemical Reactivity increases as you go down the group....

Explanation:

Hope it Helps!!!

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Answer:

An alkaline solution is another name for a solution that is basic. All alkali metals react readily with water to produce the metal hydroxide and hydrogen gas. The resulting solutions are basic.

An alkaline solution is another name for a solution that is base. All alkali metals react readily with water to produce the metal hydroxide and hydrogen gas. The resulting solutions are basic.

According to the Arrhenius concept, base is defined as a substance which yields hydroxyl ions on dissociation.These ions react with the hydrogen ions of acids to produce salt in an acid-base reaction.

Bases have a pH higher than seven as they yield hydroxyl ions on dissociation.They are soapy in touch and have a bitter taste.According to the Lowry-Bronsted concept, base is defined as a substance which accepts protons .Base react violently with acids to produce salts .Aqueous solutions of bases can be used to conduct electricity .They can also be used as indicators in acid-base titrations.

They are used in the manufacture of soaps,paper, bleaching powder.Calcium hydroxide ,a base is used to clean sulfur dioxide gas while magnesium hydroxide can be used as an antacid to cure acidity.

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Using thermodynamics

\(\\ \sf\longmapsto Q=mc∆T\)

\(\\ \sf\longmapsto Q=0.015(328)(4184)\)

\(\\ \sf\longmapsto Q=20585.28J\)

The answer is A produces a decrease in the entropy of the system

A)  we know that entropy is the measure of randomness. if randomness increases entropy also increases.

 entropy order of substances  : solid  <  liquid  < gas

here conversion of liquid to solid means randomness decreases . so that entropy decreases

B)  \(liquid \rightarrow gas\: conversion\) . so entropy is increases

C)  dissolution of LiOH. that means  LiOH molecules distributed more randomly in the solution so more disorder and more entropy

D)  ice melting means : solid to liquid so entropy also increases

E) gas mixing means more disturbed in the gases more disturb will leads to more randomness and more entropy

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2890 g H₂O

Math

Pre-Algebra

Order of Operations: BPEMDAS

Chemistry

Atomic Structure

Stoichiometry

Step 1: Define

9.65 × 10²⁵ molecules H₂O (water)

Step 2: Identify Conversions

Avogadro's Number

Molar Mass of H - 1.01 g/mol

Molar Mass of O - 16.00 g/mol

Molar Mass of H₂O - 2(1.01) + 16.00 = 18.02 g/mol

Step 3: Convert

Step 4: Check

Follow sig fig rules and round. We are given 3 sig figs.

2887.63 g H₂O ≈ 2890 g H₂O

Answer:

yeast

Explanation:

sorry if incorrect

Answer:

b. 2-4

Explanation:

Look at the slope of the line, between 0-2 and 4-6 the slope is only 10, but between 2-4 the slope is 20, so that's when the temperature is changing the fastest. In the same time it took for the water to increase by 20 degrees between 0-2 and 4-6, the temperature of the water increased by 40 degrees between 2-4 so that's when the change is the fastest.

At ω = 1, the value is 1 × 100 = 100 dB (approximately).

At ω = 10, the value is 1 × 1 = 1 dB.

At ω = 1000, the value is 1 × 0.1 = 0.1 dB (approximately).

To sketch the Bode plot of the given system, let's first calculate the values at the break points.

Break Point 1 (ω = 1):

H₁(s) = (s + 1) / (s + 1) = 1

H₂(s) = (100s + 100) / (s + 100) ≈ 100 (since s ≈ 1 at ω = 1)

Break Point 2 (ω = 10):

H₁(s) = (s + 1) / (s + 1) = 1

H₂(s) = (100s + 100) / (s + 100) ≈ 1 (since s ≈ 10 at ω = 10)

Break Point 3 (ω = 1000):

H₁(s) = (s + 1) / (s + 1) = 1

H₂(s) = (100s + 100) / (s + 100) ≈ 0.1 (since s ≈ 1000 at ω = 1000)

Now, let's deduce the Bode plot of GT(s) = H₁(s) × H₂(s).

At ω = 1, the value is 1 × 100 = 100 dB (approximately).

At ω = 10, the value is 1 × 1 = 1 dB.

At ω = 1000, the value is 1 × 0.1 = 0.1 dB (approximately).

Below given image bode plot is there.

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The notation for the enthalpy of the solution is ∆Hsol. The correct answer is option ∆Hsol.

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- The atmospheric pressure in Denver, Colorado, is approximately 0.829 atm.

- The atmospheric pressure in Denver, Colorado, is approximately 627.522 torr.

The atmospheric pressure in Denver, Colorado, is usually about 84.0 kPa. To convert this pressure to atm and torr units, we can use the following conversion factors:

1 atm = 101.325 kPa

1 atm = 760 torr

First, let's convert 84.0 kPa to atm:

Pressure in atm = 84.0 kPa × (1 atm / 101.325 kPa) ≈ 0.829 atm

Therefore, the atmospheric pressure in Denver, Colorado, is approximately 0.829 atm.

Next, let's convert 84.0 kPa to torr:

Pressure in torr = 84.0 kPa × (760 torr / 101.325 kPa) ≈ 627.522 torr

Therefore, the atmospheric pressure in Denver, Colorado, is approximately 627.522 torr.

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I am not exactly sure if this is the answer you are looking for, but both ionic and molecular compounds require the presence of a nonmetal.

The properties of both ionic and molecular compounds are related to the nature of the bonding metals and nonmetals.

Ionic bonds are formed between metals and non metals. Metals are electron rich and easily loss one or more electrons to electron deficient nonmetals.

The metals gain a positive charge by donating electrons and the nonmetals gain negative charge by withdrawing electrons. The oppositely charged ions attracts electrostatically and form the ionic bond.

Molecular compounds are formed by the covalent bonding between non-metals. Here, the non metals shares their one or more valence electron and forms a bond. They do not furnish any ions and exists as a molecule.

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132 gm of CO₂ is generated by combustion of 342 gm of C₈H₁₈.

The molar mass of a chemical compound is defined as the ratio between the mass and the amount of that substance in any sample. A material's molar mass is a bulk characteristic rather than a molecular one.

The molar mass of a substance is its mass expressed in grams per mole. G/mol, or grams per mole, is the sign for molar mass. The ratio between the mass of an isotope and the mass of the isotope carbon is known as the isotopic atomic mass, or mass of a single isotope of any particular element. -12

The reaction is :

C₈H₁₈ + 12.5O₂ ----> 8CO₂ + 9H₂O

Molar mass of C₈H₁₈ is = 12*8 + 18*1 = 114 gm

Molar mass of CO₂ is = 12+ 16*2 = 44gm

44gm of CO₂ is generated by 114 gm of C₈H₁₈

1 gm of CO₂ is generated by 114/44 gm of C₈H₁₈

132 gm of CO₂ is generated by combustion of 114*132/44 = 342 gm of C₈H₁₈

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When the friction slider was increased to about ¼, the skater completed less loops before failing?

We can define the friction that is acting on the object as the kind of force that is acting on an object so as to reduce the speed of the object. As such, we can see that we have a situation whereby we have an object that is in motion.

If an object is in motion, we know that the force that tries to slow down the object is the force of the friction that is acting on the object that is in question. The skater is also under the action of the force of friction and this is the force that is attempting to slow the skater down as described above.

The loops would decrease when the friction is increased as such the skater can not be able to do as much loops as before.

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The Ksp for La(IO3)3 is 2.7 × 10^-27. So, the correct option is  (B) 2.7 × 10^-27.

The solubility of La(IO3)3 can be represented as follows:

La(IO3)3(s) ⇌ La3+(aq) + 3IO3-(aq)

The equilibrium expression for this reaction is:

Ksp = [La3+][IO3-]^3

Let x be the molar solubility of La(IO3)3 in the solution. Then, we can write:

[La3+] = x

[IO3-] = 0.10 - 3x

Substituting these values into the equilibrium expression gives:

Ksp = x(0.10 - 3x)^3

We are given that the solubility of La(IO3)3 in the solution is 1.0 × 10^-7 mol/L, which means:

x = 1.0 × 10^-7 mol/L

Substituting this value into the equilibrium expression and solving for Ksp gives:

Ksp = (1.0 × 10^-7)(0.10 - 3(1.0 × 10^-7))^3

Ksp = 2.7 × 10^-27

Therefore, the answer is (B) 2.7 × 10^-27.

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Answer:

When air is admitted into the well, the water recedes from the level of static head to the bottom of the discharge pipe. The displaced column of liquid rises up the discharge pipe. Air bubbles mix with water and this reduces the specific gravity of the column of water sufficiently to lift it to the surface.

Explanation:

True. The formation of an ionic compound from the metal strontium and the nonmetal chlorine can be represented using electronic configurations, orbital rotation, and electron dot structures.

Strontium is a metal that has the electronic configuration of [Kr] 5s2, and chlorine is a nonmetal with the electronic configuration of [Ne] 3s2 3p5. When they form the ionic compound, strontium will lose two electrons from its outer shell to become a positively charged ion (Strontium ion), while chlorine will gain one electron from its outer shell to become a negatively charged ion (Chloride ion). This will result in the formation of the ionic compound, Strontium Chloride, with the electronic configuration of [Kr] 5s1 and [Ne] 3s2 3p6, respectively.

The electron dot structure of Strontium Chloride is written as [Strontium] + [Chlorine] -, indicating that the Strontium ion is surrounded by the Chloride ion. The orbital rotation of Strontium Chloride shows how the two atoms of Strontium and Chlorine are held together by ionic bonds.

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Answer:

Incandescence is the emission of light caused by high temperature. ... Metals, such as aluminum, magnesium, and titanium, burn very brightly and are useful for increasing the temperature of the firework. Luminescence the emission of light by a substance that has not been heated.

Explanation:

The word incandescence refer to the light produce from heat. When solution is heated it will rise up the light scale through infrared, red and the rest of the color. Fireworks is create by controlling the amount of heat which keep it in one color.

Fireworks are a class of low explosive pyrotechnic device used for aesthetics and entertainment purpose.

They are commonly used in displays, combining a large number of devices in an outdoor setting.

With increase in sound level it can lead to restlessness, temporary or permanent hearing loss, high blood pressure and sleep disturbance.

Fireworks can also cause respiratory problems such as chronic or allergic bronchitis, asthma etc.

Fireworks release a fine cloud of smoke and particulate matter affecting local area quality.

Thus, the word incandescence refer to the light produce from heat. Fireworks is create by controlling the amount of heat which keep it in one color.

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The mass of the titanium dioxide that is required is  4.32 g.

We know that a solution can be made when we dissolve a solute in a solvent. The solvent is the liquid to which we have to add the solid and then allow it to dissolve. We are now asked to find the mass of the solute that have been dissolved in order to get the solution.

Thus the combination of the solute and the solvent is what we have referred to in this context as the solution of the titanium dioxide.

We have the following information;

Concentration of the solution = 12 M

Volume of the solution = 4.5 mL

We know that;

number of  moles = concentration * volume

Number of moles = 12 M * 4.5/1000

= 0.054 moles

Now;

Mass = Number of moles * molar mass

= 0.054 moles * 80 g/mol

= 4.32 g

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