Which of the following best explains why atomic radius decreases from left to right across a period?

Answer:

chemical equilibrium is the state in which both the reactants and products are present in concentrations which have no further tendency to change with time so that there is no observable change in the properties of the system

Explanation:

This is a textbook answer so it may not be right

The half-life of iodine-123 is 13.3 hours: Option B: 3.13 mg of a 25.0 mg sample will remain after 39.9 hours.

Initial figure at a constant pace K. equivalent to two lawns over the half-life. One of the two over the half-life would be this. 13.3 hours is iodine 123. This would give us.05 hours to the negative one. then take K. T. out. So much homosexual is equivalent to the original dosage, which is 225 mg. Make a note of 25 mg, -15 hours, and 2 -1 39.9 hours. Therefore, using this would require using a lot of 25 3.22 -9.9 2.08 3 22 for more or less two months. A launch at 1.14. is the same as 1.14. You receive 3.13. It would be measured in milligrams. Thus, 3.13 mg would still be in my system after 39.9 hours.

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The solubility of Sugar in water at 20°C is 204g and it s a standard value

The maximum weight of a substance that can dissolve in 100 g of water is a typical way to measure how soluble it is in water. A saturated solution is the one that has been made with this concentration.

The ratio of the solute to the solvent in a particular circumstance, such as a particular temperature, is known as the solubility. The temperature of the water affects a substance's ability to dissolve. You may dissolve 203.9 grams (or 200 grams) of sugar in 100 mL of water at normal temperature (about 20 degrees C).

Up to around 500 grams of sugar will dissolve in 100 mL of water at 100 degrees C as water temperature rises.

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The volume when the pressure increases back to 5.00 atm will be 0.100 L.

Pressure is a physical force exerted on a surface by the application of another force. It can be measured in terms of force per unit area and is usually expressed in terms of the pascal (Pa). Pressure can be caused by gravity, air, water, or other physical substances. Pressure can be used to create motion or to control the flow of a liquid or gas. It is also used in engineering, manufacturing, and other applications. Pressure can be used to measure the amount of energy stored in a system, such as in a pressure cooker. Pressure is also used in medical and scientific applications, such as measuring blood pressure and measuring atmospheric pressure.

This is because the volume of a gas is inversely proportional to its pressure. Therefore, when the pressure increases, the volume decreases. In this case, the initial pressure was 1.00 atm and the initial volume was 1.00 L. Since the pressure doubled to 5.00 atm, the volume must be halved to 0.100 L.

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Marissa is investigating a biochemical reaction involving carbon compounds. the reaction requires a specific enzyme. The role of the enzyme in this reaction is to speed up the chemical reaction.

Enzymes are protein molecules. Enzymes lower the activation energy necessary for the reaction to occur. This allows the reaction to happen more quickly than it would without an enzyme present.

Any reaction requires a specific enzyme. That specific enzyme allow the

reaction to speed up, otherwise there is no change in reaction speed.

Enzymes work by decreasing the activation energy required to start biochemical reactions.

So, the enzyme role of enzyme is to speed up the reaction ad decreasing the activation energy of the reaction.

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False. It is more crucial to arrange the components of a scientific process in a manner that is understandable to you than it is to list them in sequentially when modeling it.

The engineers can now do their tasks continuously instead of sequentially as they did in the past. pertaining to or founded on a procedure for testing a statistics hypothesis that requires looking at a series of samples before deciding whether to approve or reject the theory or to keep sampling from each one. sequentially.

Sequential tasks involve steps in a together that and follow a sequential order or sequence. Writing a message, creating a recognisable image, and piecing together a puzzle are a few examples of these activities.

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3.38 is the pH of a buffer solution that is 0.266 m in lactic acid and 0.111 m in sodium lactate. The ka of lactic acid is 1.4 x 10^-4.

To determine the pH of a buffer solution, you will need to use the Henderson-Hasselbalch equation, which is:

pH = pK + log ([salt]/[acid])

where pK is the acid dissociation constant (Ka) of the acid, [salt] is the concentration of the salt, and [acid] is the concentration of the acid. In this case, the Ka of lactic acid is 1.4 x 10^-4, the concentration of the salt (sodium lactate) is 0.111 M, and the concentration of the acid (lactic acid) is 0.266 M.

Putting values into the equation, we get:

pH = -log(1.4 x 10^-4) + log(0.111/0.266)

= 3.85 + (-0.47)

= 3.38

So, the pH of the buffer solution is approximately 3.38.

It's important to note that this equation is only valid for buffer solutions that are in the region of their pK. If the pH of the solution is far from the pK, the buffer may not work as effectively. Additionally, this equation assumes that the concentration of the salt and acid are equal, which may not always be the case in real-world situations. In such cases, it may be necessary to use more complex calculations to accurately determine the pH of the buffer solution.

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5.76 L of stock solution is needed to prepare 8L of 0.072 M of  0.10M  concentration of Ba (OH)2. This is calculated by the expression of Molarity.

Molarity is a measure of the concentration of a chemical species in particular of a solute in a solution in terms of amount of substance per unit volume of solution. It is also known as the Molar concentration. By using Molarity equation,

   M1 V1 = M2 V2

The volume of a stock solution of Ba(oh)2, with a concentration of 0.10 m, needed to prepare 8.0 l of 0.072 m Ba(oh)2. A stock solution is prepared by weighing out an appropriate portion of a pure solid or by measuring out an appropriate volume of a pure liquid placing it in a suitable flask and diluting to a known volume.

M1 = 0.10M

M2 = 0.072M

v2 = 8L

We can calculate for V1 by putting all these values in the expression of Molarity.

 V1 = M2 V2 / M1

       = 0.072 M * 8L / 0.10 M

      = 5.76 L

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The given statement "the physical state of a reactant or product will affect the enthalpy of reaction in a thermochemical equation," is false.

The heat of reaction is influenced by the physical state of the reactants and products.

The term "thermochemical equation" refers to a balanced chemical equation that not only specifies the quantities of the various reactants and products but also the quantity of heat generated or absorbed.

A thermochemical equation may be written using fractional coefficients.

H2 ( g ) + ½ O2 ( g ) ⇒H2O ( l ) +285.8 KJ mol-1

H2 ( g ) + ½ O2 ( g ) ⇒ H2O ( l )  ΔH = – 285.8 KJ mol-1

When 1 mole of hydrogen and 0.5 mole of oxygen react, 285.8 KJ mol-1 of heat is produced. The heat generated will also double if the reactant amounts are doubled.

2H2 ( g ) + O2 ( g ) → 2 H2O ( l ) + 571.6 KJ mol-1

2H2 ( g ) + O2 ( g ) → 2H2O ( l ) ,ΔH = – 571.6 KJ mol-1

The heat of reaction, enthalpy of reaction, or enthalpy change of reaction is the quantity of heat that is evolved or absorbed in a chemical reaction once the number of moles of reactants as represented by the chemical equation have completely reacted.

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The molarity of a sodium hydroxide solution is found to be 0.197 M.

A solution's molarity is its solute concentration, which is measured in moles per liter. To calculate molarities after mixing solutions, use the formula M₁V₁=M₂V₂, where M₁ is the initial concentration and M₂, is the final concentration, and  V₁ and V₂ are the initial and final volume.

Given V₁  is 28.7 ml = 28.7×10⁻³ L, V₂ is  22.30 ml = 22.30×10⁻³ L, and M₂ is 0.253 M.

Then, the molarity of sodium hydroxide is,

M₁ = (M₂V₂)/V₁

M₁ = (0.253 M × 22.30×10⁻³ L)/28.7×10⁻³ L

M₁ = 0.1965 M.

The answer is 0.197 M.

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0.3 M is the  molarity of the solution in which the mass of the plant pieces would not change .

The moles of a solute per litres of a solution known as molarity. The molar concentration in a solution is another term for molarity. Molarity (M), which is determined by dividing the solute's mass in moles by the volume of the solution in litres, is the most widely used unit to express solution concentration: litres of solution/moles of solute equals M.

One litre of a solutions with a 1.00 molar concentration (1.00 M) contains 1.00 moles of solute. Molarity is measured in mol/L. The molarity, which is given as moles/liter, is the quantity of moles of solute per litre of the solution. Measures of the concentration of a mixture of chemicals include molarity and molality. The main distinction between the two is based on mass.

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Answer:

1:1

Explanation:

When 1-butanol is reacted with p/i2, the resulting molecule is ch3ch2ch2ch2i.

A metabolite generated or discovered in Saccharomyces cerevisiae is 1-butanol. A hydroxy group is swapped for hydrogen of one of the methyl groups in the primary alcohol known as butane-1-ol, which is butane. It is created by gut microorganisms in humans at tiny levels. It functions as a protic solvent as well as a human and mouse metabolite. It is a short-chain primary fatty alcohol, a primary alcohol, and an alkyl alcohol. A clear liquid, n-butyl alcohol has no color. Utilized in the production of organic chemicals, plasticizers, detergents, etc.

As a result, choice E is the right response.

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Considering the definition of complete combustion, the chemical equation for the complete combustion of C₇H₁₆ is:

C₇H₁₆(l) + 11 O₂(g) → 7 CO₂(g) + 8 H₂O(g)

Combustion is a chemical process through which heat is obtained. To achieve this, oxidation reactions are generated that allow the objective to be reached. It is necessary to have several elements:

Complete combustions are those reactions in which the combustible material is completely oxidized (consumed) and other oxygenated compounds are produced, such as carbon dioxide (CO₂) or sulfur dioxide (SO₂), as the case may be, and water (H₂O).

In other words, complete combustion is the result of the complete oxidation of the fuel but not the disappearance of the oxidizer, that is, the oxidation of all the fuel occurs. For this it is necessary that the necessary quantities of oxidizer and dry air intervene. All complete combustion releases, as a product of the reaction, carbon dioxide (CO₂) and water in the vapor state (H₂O).

Considering the definition of complete combustion, you get:

C₇H₁₆(l) + 11 O₂(g) → 7 CO₂(g) + 8 H₂O(g)

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The safest and most accurate way to measure the temperature of the saltwater solution in a beaker is to use a thermometer with a protective sheath.

This type of thermometer is designed to protect the user from potential burns or injury and is also more accurate than other thermometers. The sheath should be made of a material that is heat resistant, such as stainless steel.

The thermometer should also be inserted into the solution as far as possible without touching the sides of the beaker. The thermometer should be left in the solution for a few minutes to allow it to reach equilibrium with the temperature of the solution before reading it.

Finally, the thermometer should be wiped off with a clean cloth before taking the reading. This will ensure the accuracy of the reading and reduce the risk of contamination.

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Answer:

The correct answer is (b)

Explanation:

Has a slippery feel.Vinegar is an aqueous solution of acetic acid, and it has a number of properties that make it useful in a variety of applications. Some of these properties include:(a) Dissolves in water to give an aqueous solution of acetic acid (H*): Vinegar is composed of water and acetic acid, and it can be dissolved in water to form an aqueous solution.(c) Turns litmus from blue to red: Litmus is a type of dye that is used as an indicator in chemical reactions. It turns blue in the presence of an alkaline solution and red in the presence of an acidic solution. When vinegar is added to litmus, it will turn the litmus red, indicating that it is an acidic solution.(d) Reacts with zinc to give hydrogen gas: When vinegar is mixed with zinc, it can produce hydrogen gas. This reaction is an example of a redox reaction, in which the vinegar is reduced (gains electrons) and the zinc is oxidized (loses electrons).However, vinegar does not have a slippery feel, so (b) Has a slippery feel is not a property of vinegar.

Answer:

2.0 liters of oxygen gas.

Explanation:

To determine the volume of oxygen gas required to completely combust a given amount of propane, we need to know the chemical equation for the combustion of propane. The combustion of propane can be represented by the following equation:

Propane + Oxygen → Carbon Dioxide + Water

According to the balanced chemical equation, it takes two molecules of oxygen gas to completely combust one molecule of propane. Therefore, to completely combust 1.0 liters of propane at standard temperature and pressure (STP), we would need 2.0 liters of oxygen gas.

The partial pressure of the neon that is contained in a container is 3.75 atm.

The given parameters are written as follows:

No. of moles of Ne , n = 5 mol

No. of moles of N2 , n' = 3 mol

Total pressure , P = 6 atm

The mole fraction of any component of a mixture is the ratio of the number of moles of that substance to the total number of moles of all substances present. In a mixture of gases, the partial pressure of each gas is the product of the total pressure and the mole fraction of that gas.

Mole fraction of Ne , X = n / (n+n' )

                                  = 0.625

Mole fraction of N2 , X' = n' / (n+n' )

                                    = 0.375

Partial pressure of Ne , p = X * P

                                     = 0.625 * 6

                                     = 3.75 atm

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According to the question, this is known as the positive control experiment when Sometimes, even knowing that a chemical reaction would have the desired effect, scientists will nevertheless test it.

Chemical processes occur when atoms form or break chemical bonds. The molecules that start a chemical reaction are known as reactants, and the substances that are generated as a result of a reaction are known as products.

To produce designer chemical conversion products and to stop the decomposition and isomerization of valuable compounds, chemical reactions must be controlled "The capability of the reactant molecules to migrate through to the solvent and come into contact with one another controls the rate in a diffusion-controlled reaction. The capacity of the reactants that have come into contact to obtain sufficient energy to react regulates the rate of an activation-controlled reaction."

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Answer: 3

Explanation:

trust

A hydrate is a salt that has been joined with water (H₂O), having the formula saltx H₂O, where x is the number of water molecules linked to each salt molecule.

CaSO₃+3H₂0, or calcium sulfate trihydrate, is an example of a hydrate, and it is written thus way since the water molecules are not actually part of the formula. A hydrate is an ionic substance with water molecules as part of its structure. To empirically discover the formula of a hydrate, we must compute the mole:mole ratio of the water portion to the anhydrate portion. An anhydrate is the material that remains after the water in a hydrate has been eliminated. any substance containing water molecules (H₂O).

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I used the simulation to model the changes by adjusting the Temperature slider at the bottom. As I increased the temperature, the equilibrium shifted towards the products side.

The temperature is a measure of how hot or cold something is. It is measured using a thermometer and can be expressed in Celsius, Fahrenheit, or Kelvin. Temperature can be affected by many factors, including air pressure, humidity, wind, and the time of day.

I also observed the pie graph to see how the system changed. As the temperature increased, the number of molecules for both nitrogen and hydrogen decreased, while the number of molecules for ammonia increased. I also used the pause button on the simulation to observe the number of particles at any point of time. This allowed me to see how the reaction was progressing and how the equilibrium shifted as the temperature increased.

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5.87 g of nickel (Ni), is deposited when 0.2 faraday of electrical charge is transmitted through a solution of NiS[tex]O_{4}[/tex].

The balanced Equation of nickel is :

Ni²⁺ + 2e —> Ni

The Molar mass of nickel is 59 g[tex]mol^{-1}[/tex]

The Molar mass of Ni= 1×59=59 g[tex]mol^{-1}[/tex]

Number of faraday =2                                      (∵ Nickel losses 2 electrons )

To Determine the mass of Ni deposited.

2 faraday deposits 59 g[tex]mol^{-1}[/tex] of nickel.

To get 0.2 farad deposits what mass of nickel , we have,

2 farad = 59  g[tex]mol^{-1}[/tex] of nickel

0.2 farad = ?

⇒[tex]\frac{(59 gmol^{-1} )(0.2 )}{2}[/tex]

⇒5.87  g[tex]mol^{-1}[/tex] ≈ 5.9 g [tex]mol^{-1}[/tex]

Electroplating is essentially the hydrolysis-based plating of one metal onto another, either to stop corrosion of the metal or for ornamental purposes. In order to create a slim coherent metal coating on the electrode, the technique reduces dissolved metal cations using an electric current. When anions are electrically oxidized on a solid substrate, such as when silver chloride is formed on silver wire to create silver chloride electrodes, electroplating is frequently used.

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Answer: The limiting ingredient is cheddar cheese. You only have 3 slices and that is not enough to make 4 sandwiches. Therefore, cheddar cheese is the limiting ingredient as you cannot make any more sandwiches without it.

P.S Please hit like button.

Answer:

mayonaise

Explanation:

In case of O3 or SO2, the SO2 has a greater dipole moment than O3.

In case of HBr or HCl, the HCl  has a greater dipole moment than HBr.

In contrast to SO2, which has shorter and stronger bonds than SO, O3 has longer and weaker bonds than O2.

Recoupled pair bond dyad in SO2 produces SO double bonds. On the other hand, O3 has a lone pair on the center oxygen atom in addition to a pair of orbiting electrons on the terminal oxygen atoms, which results in a comparatively weak connection.

Both molecules are polar, although SO2 is more polar than O3 (dipole moment 0.53D ) with a dipole moment of 1.62D.

EN values for Br (2.96), Cl (3.16), and H (2.2) . Cl has the greatest electronegativity; the difference in polarity between H and Cl is the largest, 0.96; while in HBr, the difference in EN value is 0.76.

As a result, HCl will have a higher dipole moment than HBr. The increment of dipole moment is directly proportional to the increment of the electronegativity.

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The pKb of the weak monoprotic base given in the question is approximately 12.32.

To find the pKb of the weak monoprotic base, you can use the equation for the ionization of a weak base: B + H2O <-> BH+ + OH- where B is the base and BH+ is the conjugate acid of the base. The pKb of the base is related to the equilibrium constant for this reaction (Kb) by the equation: pKb = -log(Kb) In this case, the concentration of the base (B) is given as 7.50 x 10^-2 M, and the pH of the solution is given as 10.5. The pH of the solution is related to the concentration of OH- ions by the equation: pH = 14 – pOH where pOH is the negative logarithm of the concentration of OH- ions. Therefore, the concentration of OH- ions in the solution is: [OH-] = 10^(-pOH) = 10^(-10.5) = 3.16 x 10^-11 M Using the equilibrium constant expression for the ionization of a weak base: Kb = [BH+][OH-] / [B] you can solve for Kb by substituting the given values for [BH+], [OH-], and [B]: Kb = [BH+][OH-] / [B] = (7.50 x 10^-2 M)(3.16 x 10^-11 M) / (0.250 L) = 4.80 x 10^-13 Finally, you can use the equation pKb = -log(Kb) to solve for the pKb of the base: pKb = -log(Kb) = -log(4.80 x 10^-13) = 12.32 Therefore, the pKb of the base is approximately 12.32.

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[tex]H_{b} < H_{c} < H_{a} < H_{d}[/tex]  is the increasing order of acidity in given compound.

where  [tex]H_{b}[/tex] is least acidic and  [tex]H_{d}[/tex] is most acidic

Higher the stabilization of negative charge produced as a result of removal of proton higher the acidity.  [tex]H_{d}[/tex]  is most acidic because after removal of  [tex]H_{d}[/tex] ,negative charge on oxygen is resonance stabilized by (c=o) group .

similarly after   [tex]H_{d}[/tex]  , [tex]H_{a}[/tex]  is most acidic because negative charge on oxygen is stabilized by conjugation with benzene.

After  [tex]H_{a}[/tex]  , [tex]H_{c}[/tex]  is more acidic than [tex]H_{b}[/tex]  because negative charge on oxygen  is more stabilized while negative charge is less stabilized in carbon.

So to decide the order the stabilization of negative charge produced as a result of removal of proton is checked.

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complete question:

rank the labeled protons (ha-hd) in order of increasing acidity, starting with the least acidic for  below figure.

The inflammatory response starts to work when tissue is harmed. Before using water for cooking or drinking, consumers are advised by radio announcement to boil it.

Pain, swelling, heat, and redness (Latin: rubor, calor, and tumor) are the four primary indicators of inflammation (dolor).

When tissues are harmed, the immune system is activated and the inflammatory response begins. The innate immune system's immune cells, or neutrophils and eosinophils, are drawn to the site of tissue damage or injury via blood arteries and the lymphatic system before macrophages.

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Answer:

True

Explanation:

I took the test