The atomic number of potassium is 19. How does the isotope potassium 39 differ from isotope potassium 41?.

Answer:

B.) The difference in electronegativity of the two elements is less than 1.7.

Explanation:

A difference of less than 2 between atoms leads to covalent bond formation. Electronegativity is the ability of an atom to draw bonding electrons when it is bonded.

We know that in covalent bonding, atoms "share" elections. We also know that in ionic bonding, atoms "take" electrons. If the electronegativity was too great then atoms would no longer share electrons, one would just draw the electron to it. The ideal values to covalently bond, in this case, would be below two.

The egg would be found to float on the sea water which is denser but would tend to sink in the fresh water which is less dense.

The term salinity has to do with the amount of salt that is present. A solution is very saline if there is a high concentration of salt in the solution. We know that sea water has a greater density than water. The reason why the density of the sea water is greater than the density of the pure water is that the sea water contains dissolved salts.

Now, we know that given the fact that the sea water is denser than the fresh water, it is easier for an object to sink in the fresh water than it does in the sea water which is denser. This is even observed in ships as there is a greater tendency to remain afloat in sea water than in salt water.

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Nitrogen has five valence electrons, among the following electron configurations (image attached) option (a) represents the ground state for nitrogen.

The atomic number of nitrogen is seven, so the electronic configuration of nitrogen is as:

    1s² 2s² 2p³

Electrons present in 2s and 2p are valence electrons, so the total number of valence electrons is 5. In the outer orbitals, 2s accommodates 2 electrons in the ground state. As we can see that only options (a) (d) and (e) have 2 electrons in 2s, so we consider these as the correct option. Option (d) is also wrong because it consists of outer electrons but the nitrogen has 5 outer electrons. Option (e) is also wrong because it has 6 outer electrons. So the only correct option is (a) having 5 outer electrons 2 in 2s and 3 in 2p.

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The heat of fusion of water is B. 348 J when 20g ice is dropped into the water at 35°C.

The heat of fusion of water is the amount of heat required to melt one gram of ice at 0.00°C. Since the ice melted in this experiment, we know that the heat of fusion must be greater than or equal to the amount of heat lost by the ice.

The heat lost by the ice can be calculated using the following equation:

Q = mc∆T

where Q is the heat lost by the ice, m is the mass of the ice, c is the specific heat capacity of ice, and ∆T is the change in temperature.

Using the values from the experiment, we have:

Q = (20.0 grams)(2.09 J/g°C)(35.0°C - 18.1°C)

Q = 348 J

Hence the correct option is B.

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Number of unpaired electrons present is 1 electron therefore it is paramagnetic in nature. Number of unpaired electrons in zinc is zero therefore it is diamagnetic in nature

The magnetic properties of a compound can be determined from the electronic configuration and the size of the atoms. Because magnetism is generated by the electronic spin. The number of unpaired electrons in a specific compound indicates how magnetic the compound is.

If there are unpaired electrons present in the electronic configuration then the compound is said to be paramagnetic in nature. If the compounds have all paired electrons then the compound is said to be diamagnetic in nature.

In case of Fluorine the atomic number of the atom is 9 so we can see that in the 2p orbital there are 5 electron among which 4 are paired electrons and 1 is unpaired electrons. Hence it is paramagnetic in nature.

Zinc atomic number is 30, and we see that there are no unpaired electrons that are present hence the atom is diamagnetic in nature.

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It would be starch or any other pill-coating material that was left.

Why is dichloromethane a good solvent for extraction?
Dichloromethane can dissolve a variety of organic compounds, despite the fact that it is not miscible with water. These characteristics make DCM a very powerful solvent in many industrial processes, along with its volatility.

What is dichloromethane used for?
Dichloromethane is a solvent used in the production of food. In aerosol formulations, it is used. It is a blowing agent for ethane foam. used in the production of pharmaceutical products as a solvent.

Why is dichloromethane not a good solvent?
DCM and other organic solvents are hazardous due to their high volatility. As a result, they can quickly evaporate.

It would be starch or any other pill-coating material that was left.

This is because starch binds the tablet together but is an inactive ingredient that would not dissolve in the solvent.

Thus, the solid remained behind starch or any pill-coating substances.

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The three primary constraints that project managers should be familiar with are time, scope, and cost.

What are some examples of constraints?

What are the 4 common types of constraints facing services?

What types of situational restrictions are there?

What are some instances of societal restrictions?

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The principle quantum number, n indicates the principal energy level.

The angular quantum number, l indicates the shape of orbital in space

The magnetic quantum number, m indicates the sublevel of the orbital

The relative size of the orbital is related to the value of quantum number n

The shape of orbital is related to the value of so the quantum magnetic number l.

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Answer:

They have eight valence electrons, which fill their outer energy level

Explanation:

Noble gases are the least reactive of all elements. This is the most stable arrangement of electrons, so noble gases rarely react with other elements and form compounds.

Answer:

because their valance shell (outermost shell)  is completed with the maximum number of electrons

Explanation:

The components of a solution are solute and solvent, such as solute is the substance that is being dissolved, whereas the solvent is the dissolving medium.

Polar solvents dissolve polar solutes and similarly non-polar solvents dissolve non-polar solutes. Water is a polar solvent and it dissolves salts and other polar molecules but not non-polar molecules such as oil.

a) Ethanol is soluble in both water and hexane.

b) benzene, carbon dioxide, and tetrachloromethane will be soluble in octane since these compounds are nonpolar.

c)Solubility of potassium chloride is maximum in water. Potassium chloride is an ionic solid and water is a polar solvent.

d)Hydrogen peroxide is soluble in water which is a polar.

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The activity coefficient of the given solution would be 0.85

What is activity coefficient in thermodynamics?

Activity coefficient is a major factor in the area of thermodynamics, it can be used to account for any deviations such as in the case of substances or chemical mixture.

If the solution is ideal then activity coefficient of  glucose can be calculated in the following manner :

a = 0.66 k / Kf = 0.355 mol/kg

The molality of the solution is

m = 73 gm X  1mol / 180.16 g / 966 X 10-3kg = 0.419 mol/kg

The activity coefficient is y = a / n

                                         y = 0.3555 mol/kg / 0.419 mol/kg = 0.85

This is how we can determine the activity coefficient.

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The octet rule refers to the tendency of atoms to prefer to have eight electrons in the valence shell.

There are three violations to the octet rule are odd-electron molecules, electron-deficient molecules, and expanded valence shell molecules.

The octet rule refers to the tendency of atoms to favor to have eight electrons within the valence shell. while atoms have fewer than eight electrons, they tend to react and form greater solid compounds.

The octet rule refers to an crucial precept that the atoms which have bonded percentage eight outer electrons. This honestly method that the atom's valence shell has a resemblance with a noble gas. The octet rule states that the atoms like to have 8 electrons most effective of their complete outer shells.

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Disclaimer:- Your question is incomplete,please see below for the complete question.

H : Cl

A. This structure is correct due to the total number of bonds and electrons.

B. this structure is incorrect due to the total number of electrons for the involved atoms.

C. this structure is correct due to allowed exceptions to the octet rule for the involved atoms.

D. this structure is incorrect because the octet rule is not fulfilled for all the atoms.

Answer: The total mass of the reactants must equal the total mass of the products.

Explanation: This is because the mass of all reactants is the mass of all products. Remember that escaping gases from products can lessen the mass. But in all, all products have the same mass as the reactants. I hope this helps!

I think the ball has energy but less energy than if it was sitting on the ground because it is farther away from Earth’s surface. Therefore option C is correct.

In order to accomplish labor and to produce heat and light, energy must be transmitted to a body or to a physical systems. Energy is a preserved resource, according to the rule of conservation of energy, energy can only be transformed from one form to another and cannot be generated or destroyed.

Examples of these include, electrical energy, sound energy, chemical energy, nuclear or atomic energy, light energy, heat energy, mechanical energy, gravitational energy, and so on.

Thus, option C is correct.

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change in entropy for CO2 is 83.78 J/[tex]^{o}C[/tex] and for N2 is 121 J/[tex]^{o}C[/tex]

Entropy Change can be defined as the change in the state of disorder or randomness of a thermodynamic system that is associated with the conversion of heat or enthalpy into work. A system with a great degree of disorderliness or randomness has more entropy.

Entropy also describes how much energy is not available to do work. The more disordered a system is higher is the entropy, the less of a system's energy is available to do work.

To calculate the change in entropy;

For CO2:

Moles of CO2 = [tex]10^{5}[/tex] × 0.7 ÷ (R×298) = 234.9/R

ΔS = 234.9 ln (1/0.7) = 83.78

For N2;

Moles of N2 = [tex]10^{5}[/tex] × 0.3 ÷ (R×298) = 100.7/R

ΔS = 100.7 ln (1/0.3) = 121.24

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The change in entropy of ammonia is 132.2 J/K.

Firstly calculating molar entropy by the formula -

∆S = ∆Hv/T, where ∆S is entropy, ∆Hv is heat of vaporization and T is temperature.

∆Hv = 23.4 × 10000

Performing multiplication

∆Hv = 23400 J/mol

T = -33.5 + 273

Performing subtraction

T = 239.5 K

Keep the values in formula to find molar entropy.

Molar ∆S = 23400 ÷ 239.5

Performing division

Molar ∆S = 97.7 J/mol K

∆S = molar ∆S × number of moles

∆S = 97.7 × (23/17)

Performing multiplication and division

∆S = 132.2 J /K

Hence, the entropy is 132.2 J/K.

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Magnesium hydroxide has a limited solubility in water and is a weak base. In 1.8 x 10E-6 M solution, there are two hydroxide ions (OH-) per formula unit, or the following number of hydroxide ions per liter:

2(1.8 x 10E-6) = 3.6 x 10E-6 .

A chemical species' concentration in a solution, specifically the amount of a solute per unit volume of solution, is measured by its molar concentration. The number of moles per liter, denoted by the unit symbol mol/L or mol/dm3 in SI units, is the most often used unit denoting molarity in chemistry.

Molarity is measured in units of M or mol/L. One molar is used to describe a 1 M solution.

The amount of moles of solute per liter of solution is known as molarity (M).

Molarity is defined as moles of solute per liter of solution. The amount of moles of solute per kilogram of solvent is known as molality (m). Molality is defined as moles of solute/kg of solvent.

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1. Kc value:

C. remains the same.

2. Qc value:

C. remain the same.

3. The reaction is:

B.  Qc < Kc, the reaction will move in the forward direction.

4. The concentration of N2 is:

A. increase.

Whilst the awareness of all of the reactants increases extra molecules or ions interact to form new compounds and the fee of reaction increases. while the attention of a reactant decreases, there are fewer of that molecules or ions present, and the rate of reaction decreases. If the concentration of reactants is multiplied, there are more reactant particles moving collectively.

Calculation:-

Removing product will shift the reaction in the direction of product as per Le chatelier Principle

So, Equilibrium moves to product side

Since temperature is not changing Kc would not change.

B)Since we are removing product and Qc = [product]/[recatant]

Value of Qc will decrease and hence Qc will be less than Kc

C)Since Qc < Kc, the reaction will move in forward direction.

D)O2 is product here and reaction is moving towards product.

So, concentration of O2 would increase.

There could be more collisions and so the reaction charge is multiplied. The higher the awareness of reactants, the faster the fee of a response will be. awareness can be improved by means of dissolving an extra solute in a given extent of a solution this will increase the mass of the solute. awareness may be accelerated by means of permitting some of the solvents to evaporate this decreases the extent of the solution.

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Because there is so much empty space between the gas particles, most of a gas' volume is made up of compressible gas molecules, Hence option c is correct. i.e, Its particles are spread far apart.

The greater compressible nature of gases compared to liquids or solids is explained by the kinetic-molecular hypothesis. The average distance between the gas molecules at standard pressure and room temperature is roughly 10 times the diameter of the molecules.  Gas particles are pushed closer together when a gas is compressed, such as when the diving tank is then being filled.

There are various uses for compressed gases. Patients with damaged lungs are frequently given oxygen in hospitals to help them breathe better. When a patient is having a major procedure, a compressed gas is usually used to give anesthetic. 

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The mass spectrum of gaseous cl which contains isotopes of mass numbers 35 and 37, consists of singly-charged peaks corresponding to m/e values is 78 m/z

A mass spectrum is simply the m/z ratios of the ion present in a sample plotted against their intensities and each peak in a mass spectrum show a component of unique m/z in the sample and height of the peak cannot the relative abundance of the various components in the sample and there are two molecular ion peak in the mass spectra of compound containing a single chlorine atom and this is because chlorine exist as two isotopes ³⁵Cl and ³⁷Cl and the mass spectrum of 2 chloropropane has peak at m/z is 78 due to molecular ion containing an atom of ³⁵Cl

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Reactivity is the right response because it is the only research that causes a chemical change.

Density definition Density is the measurement of how tightly a substance is packed. It has the same definition as the mass per unit volume. Indicator of density: D or Density Formula: The formula is: = m/V and where's the density, m is the organism's mass, & V is its volume.

Absolute density & relative density are the two main types of density. The relative density, or specific gravity, of a substance is defined as its density divided by the thicknesses of a reference material. Water is commonly cited as a source of information.

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The sentence our eyes are made of nerve tissue, blood vessel tissue, muscle tissue, lens tissue, pupil tissue, and many more types of tissue to make eyes is supported by the interaction of these structures to form an organ.

An organ is a group of different tissues (such as in the case of  eye the muscle tissue and nerve tissue ) which work together to play one or more particular roles.

Therefore, with this data, we can see that an organ is a group of tissues that play particular roles in the body.

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A series of nuclear events that transform four protons into the helium nucleus, two positrons, and two neutrinos result in the fusion of hydrogen into helium.

Transformation of one element into another, typically with the emission of additional particles and energy.

There are four types decay as follows;

Beta Decay 2 neutrons and 2 protons were lost. Atomic mass decreases by 4, atomic number decreases by 2.

Alpha Decay A proton is created from one neutron. Atomic number increased by 1.

Particle Emission One proton transforms into a neutron.

Beta Decay A nucleus with a high energy output emits energy and stabilizes.

When two nuclei join together to form one atom, fusion processes take place. Two hydrogen atoms are fused together to create helium in the sun's reaction.

Thus, a series of nuclear events that transform four protons into the helium nucleus, two positrons, and two neutrinos result in the fusion of hydrogen into helium.

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When two objects collide, a force is exerted on each object. the two forces are exerted in opposite directions, but they are in different strength.

Force is defined as the physical strength.

By Newton's first law of motion,

A body moving or in rest remains in motion or in rest until or unless no external force exertes on the body.

By newton second law of motion,

the force is directly proportional to the rate of change of momentum.

Mathematically,

F = ma

When a body collide and move backward or change it's path by exerting some amount of force. The force which is exerted on the body is always opposite due to which they move backward.

Thus, we concluded that when two objects collide, a force is exerted on each object. the two forces are exerted in opposite directions, but they are in different strength.

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In the identification of configuration if the priority groups are arranged in a clockwise direction then it is R- configuration if it is anticlockwise then it is S- configuration.

All three isomers are based on a hexane chain or a chain of six carbon atoms. However, isomer 1 has a chlorine atom on the first carbon. So for 1-chlorohexidine one of the hydrogen atoms on carbon number 1 can be removed and replaced with a chlorine atom.

Cyclohexane is an alicyclic hydrocarbon containing a ring of 6 carbon atoms and is the cyclic form of hexane used as a raw material in the manufacture of nylon. Hexane is used as a special solvent and as a cleaning agent to extract edible oils from seeds and vegetables. When hexane is added to water it floats to the surface of the water with no noticeable mixing. The reason why hexane and water do not mix is ​​complicated.

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Maximum mass of water produced from the chemical reaction is calculated to be 58.46 gram.

Chemical reaction is a process where one or more substances that is the reactants are converted to one or more different substances that is the products.

2C₆H₁₄  + 19O₂ --> 12CO₂ + 14H₂O

Stoichiometry of hexane to oxygen--> 2:19

number of moles hexane = 40 g / 86.2 g/mol = 0.464 mol

number of moles of oxygen =88.6 g / 32 g/mol = 2.76 mol

If we consider hexane is limiting reactant,

As, 2 moles of hexane reacts with 19 mol of oxygen

therefore, 19/2 x 0.464 = 4.408 mol

As 4.408mol of oxygen is present, which implies O₂ is in excess and therefore hexane is the limiting reactant.

stoichiometry of hexane to water --> 2:14

2 mol of hexane will give 14 mol of water

therefore, 14/2 x 0.464 = 3.248mol

mass of water formed is 3.248 mol x 18.0 g/mol

= 58.46 gram

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The early committees trying to regulate that how the newly discovered element were named

Before the regulation were applied to the field of chemistry and the element their characteristics and other information related to them were so disorganized that this was causing the progress in the field to slow down so the committees decided to regulate things such as the names of any newly discovered element and any properties it had so that it could be put to use in a more effective way

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Accelerate the hydrologic cycle while decreasing the ocean's thermohaline circulation. (Choice b)

A hydrologic disaster is an incident that results in a major loss of life, material, and environmental harm that is brought on by changes to the hydrologic cycle. A shift in a watershed's typical hydrology due to natural or artificial factors is referred to as an adjustment of the hydrologic cycle.

Watershed hydrology has a significant impact on the long-term viability of local ecosystems and the availability of water. Land use change & rising temperatures are two of these causes.

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The boiling point of a solution made of 76 g of urea (NH₂)₂CO dissolved in 850 g of X will be 136.5 °C

Normal boiling point (T1) = 134.5 °C

Molal boiling point constant (Kb) = 1.36 °C.Kg.mol⁻¹

Weight of urea = 76 g

weight of X = 850 g or 0.850 Kg

Boiling point (T2) = ?

Calculate the boiling point elevation by using the following equation:

    ΔT = Kb × M

    M = molality

Calculate the number of moles of urea

    number of moles = mass / molar mass

    number of moles of urea = 76 g / 60.06 g/mol

    number of moles of urea = 1.3 mol

Calculate the molality

    molality = moles of solute / mass of solvent (Kg)

    molality of urea = 1.3 mol / 0.850 Kg

    molality of urea = 1.5 mol/Kg

Now calculate the ΔT

    ΔT = 1.36 °C.Kg.mol⁻¹ × 1.5 mol/kg

    ΔT = 2.0 °C

Boiling point (T2) will be:

    T2 = T1 + ΔT

    T2 = 134.5 °C + 2.0 °C

    T2 = 136.5 °C

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Answer:Chemical reactions that release energy are called exothermic. In exothermic reactions, more energy is released when the bonds are formed in the products than is used to break the bonds in the reactants. Chemical reactions that absorb (or use) energy are called endothermic.

Explanation: