iodine 131 has a half life of 8.1 days, polonium 214 has a half life of 1.5 x 10-4 s, if there are the same number of unstable nuclei in samples of both, which will have the larger activity?

Answer:

false

Explanation:

Mac's behavior in the example provided illustrates projection.

Projection is defined as a mental process in which people attribute or

displace their feelings onto others. This is usually done unconsciously

under stressful conditions.

In this scenario, we were told that Mac was angry at his teacher and took

out his anger on his little brother which depicts Projection.

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The pKa of the N-terminal amino group of a peptide is typically around 8-9. The closest value to this range is 8.14. Option A is correct.

The N-terminal amino group of a peptide refers to the amino group (-NH₂) that is located at the end of the peptide chain with a free alpha-amino group. It is the first amino acid in the peptide sequence, and it is also called the N-terminus of the peptide. The N-terminal amino group is a weak base and can accept protons to form a positively charged ammonium ion (NH₃⁺).

This is because the amino group in the peptide has a free lone pair of electrons that can act as a proton acceptor, making it a weak base. Therefore, the pKa for the N-terminal amino group of the peptide K-T-I-D is likely to be around 8-9.

Hence, A. 8.14 is the correct option.

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--The given question is incomplete, the complete question is

"What is the pKa for the N-terminal amino group of the peptide K-T-I-D? A) 8.14 B) 11.9 C) 612 D) 321 E) 0.19."--

A helium atom consists of a nucleus containing two positively charged protons and two neutrons, encircled by two orbiting electrons which carry a negative charge. A hydrogen atom has just one proton and one electron. The difference is that the nucleus is 4.1 times heavier than normal.

The correct reactant ratio for the reaction 2Fe + 3Cl2 → 2FeCl3 is 2 moles of iron (Fe) for every 3 moles of chlorine (Cl2).

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A very reactive metal is image D

A reactive metal is a metal that readily reacts with other substances in its environment, particularly with non-metals such as oxygen, chlorine, sulfur, and nitrogen. The reactivity of a metal depends on the ease with which it can lose electrons to form positive ions.  These metals are often used in chemical reactions because of their reactivity

The metal that has been shown in the image that is attached in option D is sodium which is known to loose electron easily hence it is a reactive metal.

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Answer:

The initial volume of the balloon is 3.41 L.

Explanation:

The gas laws are a set of chemical and physical laws that allow determining the behavior of gases in a closed system. The parameters evaluated in these laws are pressure, volume, temperature, and moles.

As the volume increases, the gas particles (atoms or molecules) take longer to reach the walls of the container and therefore collide with them fewer times per unit of time. This means that the pressure will be lower because it represents the frequency of collisions of the gas against the walls. In this way pressure and volume are related, determining Boyle's law which says:

"The volume occupied by a certain gaseous mass at constant temperature is inversely proportional to pressure"

Boyle's law is expressed mathematically as:

Pressure * Volume = constant

or P * V = k

Now it is possible to assume that you have a certain volume of gas V1 that is at a pressure P1 at the beginning of the experiment. If you vary the volume of gas to a new value V2, then the pressure will change to P2, and it will be fulfilled:

P1 * V1 = P2 * V2

In this case:

Replacing:

0.53 atm* V1= 0.42 atm* 4.3 L

Solving:

\(V1=\frac{0.42 atm* 4.3 L}{0.53 atm}\)

V1= 3.41 L

The initial volume of the balloon is 3.41 L.

Answer:

A

Explanation:

Answer:

Hrishikesh. bshjsjbd. jwjjja

The amount of heat required to vaporize 100.0 g of ethanol at its boiling point is 83.78 kJ.

In order to calculate the amount of heat required to vaporize 100.0 g of ethanol at its boiling point, we can use the formula Q = n * ΔHv, where Q is the amount of heat required, n is the number of moles of ethanol, and ΔHv is the enthalpy of vaporization of ethanol.

To find the number of moles of ethanol in 100.0 g, we can divide the mass by the molar mass of ethanol, which is 46.07 g/mol:moles = mass / molar mass moles = 100.0 g / 46.07 g/mol moles = 2.172 mol.

Now we can use the formula Q = n * ΔHv to calculate the amount of heat required to vaporize 100.0 g of ethanol:Q = n * ΔHvQ = 2.172 mol * 38.6 kJ/molQ = 83.78 kJ.

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Answer:

c

Explanation:

it is the right answer

Answer:

B

Explanation:

because water has the always has the same volume but it can change shape of the glass or container that it is put in

Answer:

Moon

Explanation:

Responda:

+ 0,9kJ / mol

Explicação:

Dados os calores de combustão do enxofre monoclínico e enxofre rômbico como - 297,2 kJ / mol e - 296,8 kJ / mol, respectivamente para a variação na transformação de 1 mol de enxofre rômbico em enxofre monoclínico conforme mostrado pela equação;

S (mon.) + O2 (g) -> SO2 (g)

Uma vez que são todos 1 mol cada, a mudança na entalpia será expressa como ∆H = ∆H2-∆H1

Dado ∆H2 = -296,8kJ / mol

∆H1 = -297,2kJ / mol

∆H = -296,8 - (- 297,2)

∆H = -296,8 + 297,2

∆H = 297,2-296,8

∆H = + 0,9kJ / mol

Portanto, a mudança na entalpia da equação é + 0,9kJ / mol

The statement is FALSE. Non-ferrous metals can be hardened by heat treatment, although the mechanisms and processes involved may differ from ferrous metals.

Heat treatment techniques such as precipitation hardening can be used to increase the strength of non-ferrous metals. Non-ferrous metals are metals or alloys that do not include iron (or iron allotropes, such as ferrite, etc.) in significant quantities. Non-ferrous metals are employed because they have desired qualities like reduced weight (for example, aluminium), greater conductivity (for example, copper), non-magnetic characteristics, or corrosion resistance (for example, zinc), even though they are often more expensive than ferrous metals. In the iron and steel sectors, several non-ferrous materials are also employed. Bauxite, for instance, is used as a flux in blast furnaces, whereas wolframite, pyrolusite, and chromite are utilised to create ferrous alloys.

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Answer:

A. The birthrate is higher than the death rate

Explanation:

Answer:

It would be C, Potential energy, kinetic.

Explanation:

Rank the compounds in order of increasing boiling point:

a. CH₃(CH₂)₄I, b. CH₃(CH₂)₅I, c. CH₃(CH₂)₆I.

The boiling point of a substance is the temperature at which the vapor pressure of the liquid equals the pressure surrounding the liquid and the liquid changes into a vapor.

The boiling point in this example depends on molar mass of the compounds.

The greater the molar mass of the compound, the greater is the boiling point.

M(CH₃(CH₂)₄I) = 197.9 g/mol; molar mass

M(CH₃(CH₂)₅I) = 211.9 g/mol

M(CH₃(CH₂)₆I) = 225.9 g/mol

The compound CH₃(CH₂)₆I has the greater molar mass, so it has the greatest boiling point.

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Answer:

Metallic and covalent bonds are strongly attractive; hydrogen bonding and Van der Waals forces are weakly attractive.

Explanation:

cause

Answer:

The valence electrons in the metal atom in the lattice structure can delocalize and move freely. The electrons are "loosely" connected with their parent atom in the metallic bond because most metals have excess electrons in their outer orbitals above the stable configuration.

The acceleration of the objection is 0.9375 m/s² if the players still push with a force of 150 N.

From the formula:

F = ma

a = F/m

a = 150/160

a = 0.9375 m/s²

Thus, the acceleration of the object is 0.9375 m/s² if the players still push with a force of 150 N.

The word 'force' has a very precise meaning. Force can be described as push or a pull. A force is not something that an object contains or has in it. A force is exerted on one object by another. The idea of a force is not confined to living things or non-living things.

The SI unit of force is the newton, symbolised as N. The base units suitable to force are: metre, unit of length — symbol m. The kilogram, unit of mass — symbol kg. The second, unit of time — symbol s.

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The acceleration of the objection is 0.9375 m/s² if the players still push with a force of 150 N.

The word 'force' has a very precise meaning. Force can be described as push or a pull. A force is not something that an object contains or has in it. A force is exerted on one object by another. The idea of a force is not confined to living things or non-living things.

From the formula:

F = ma

a = F/m

a = 150/160

a = 0.9375 m/s²

Thus, the acceleration of the object is 0.9375 m/s² if the players still push with a force of 150 N.

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The following has the potential to change the equilibrium in a reaction involving gases: decreasing the volume of the system to half of its original value, increasing the volume of the system to twice its original value, doubling the amount of one of the components in the system, and doubling the amount of all of the components in the system.

In chemical reactions involving gases, the concentrations of the reactants and products determine the position of equilibrium. The position of equilibrium, in turn, is affected by any changes made to the concentrations of these reactants and products, such as by changing the volume of the system or altering the amount of one or more of the components in the system.

A change in the volume of a gas system can alter the position of equilibrium in a reaction. For example, decreasing the volume of the system to half of its original value can increase the concentration of the gases and shift the position of equilibrium to the side with fewer moles of gas. Conversely, increasing the volume of the system to twice its original value can decrease the concentration of the gases and shift the position of equilibrium to the side with more moles of gas.

Doubling the amount of one of the components in the system can also change the position of equilibrium in a reaction involving gases. Increasing the amount of one of the reactants will result in the formation of more products, which will shift the position of equilibrium to the side with fewer moles of gas. Similarly, doubling the amount of all of the components in the system will result in the formation of more products, which will shift the position of equilibrium to the side with fewer moles of gas.

In summary, the position of equilibrium in a reaction involving gases can be altered by changes in volume or by changes in the amounts of the components in the system.

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The coefficient of water in the balanced chemical reaction for the neutralization of sodium hydroxide (NaOH) with sulfuric acid (H2SO4) is 2. When sodium hydroxide (NaOH) reacts with sulfuric acid (H2SO4).

They undergo a neutralization reaction to form sodium sulfate (Na2SO4) and water (H2O). The balanced chemical equation for this reaction is: 2NaOH + H2SO4 → Na2SO4 + 2H2O In this equation, the coefficient of water is 2, indicating that two water molecules are produced as a result of the reaction. In this case, we have two sodium hydroxide molecules reacting with one sulfuric acid molecule to form one sodium sulfate molecule and two water molecules.

The coefficient of water, which is the number in front of the water formula, indicates the number of water molecules formed or consumed in the reaction. In this reaction, the coefficient of water is 2, which means that two water molecules are produced as a result of the neutralization. This balanced equation is important because it allows us to calculate the amounts of reactants and products involved in the reaction, as well as the ratio between them. It helps us understand the stoichiometry of the reaction, which is crucial in chemistry calculations and determining the theoretical yield of a reaction.

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Answer:

i think 2?

Explanation:

AI2 O2

srry if wrong but

hope this helps

The chemical reaction of the formation of hydrogen iodide is given:

H2(g) + I2(g) = 2HI (g)

As you can see from the equation, only 1 mole of hydrogen and 1 mole of iodine react to form 2 moles of hydrogen iodide

The recoil of the atom is more important for small atomic masses.

What is recoil?
Recoil is the backward thrust created when a gun is fired. It is also referred to as knockback, kickback, or simply kick. Technically speaking, the projectile's and the exhaust gases' (ejecta's) forward momentum will be mathematically matched out by an equivalent and opposing momentum exerted home upon the gun as a result of Newton's third law, which states that any force needed to accelerate anything will elicit an equal but opposite reactionary force. In hand-held small arms, this same recoil momentum will eventually be transferred to the ground, but it will do so through the shooter's body, producing an audible impulse that is frequently referred to as a "kick."

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The correct answer is option A, lactones. Intermolecular esters are known as Lactones. These are cyclic esters that result from the reaction between a hydroxyl group and a carboxyl group within the same molecule.

Esters are a class of organic compounds that are formed from the reaction between a carboxylic acid and an alcohol. Inter-molecular esters are formed when two ester molecules react with each other through their carbonyl groups. Lactones are cyclic esters, meaning that the ester functional group is contained within a ring structure. Lactams are cyclic amides, carboxylic acids contain a carboxyl group, and amines contain an amino group. So, the intermolecular esters are specifically referred to as lactones.

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Answer:

59.46 g

Explanation:

To answer this question, the molecular weight of ammonium sulfate must be computed.  To accomplish this, the weights of the individual elements must be noted.
N=14.01\(\frac{g}{mol}\)

H=1.01\(\frac{g}{mol}\)

S=32.07\(\frac{g}{mol}\)

O=16.00\(\frac{g}{mol}\)

To compute the molecular weight:

\(2[14.01\frac{g}{mol}+4(1.01\frac{g}{mol})]+32.07\frac{g}{mol}+4(16.00\frac{g}{mol})=132.14\frac{g}{mol}\)

To calculate the mass:

\(0.45 mol(\frac{132.14g}{1mol})=59.463g\)