The heating curve shows the energy gain of a substance as it changes from solid to gas. Which section of the graph shows the liquid phase of the
substance gaining kinetic energy?
A. A
B. B
C. C
D. D
E. E

Aufbau states that you must fill the lowest energy orbital 3d before 4s but we fill 4s before 3d because 3d orbitals have slightly more energy than 4s orbitals.

In atomic theory and quantum mechanics, an atomic orbital is a feature describing the location and wave-like conduct of an electron in an atom. This feature may be used to calculate the possibility of locating any electron of an atom in any specific location across the atom's nucleus.

An atomic orbital is a mathematical term in atomic concept and quantum mechanics that describes the location and wavelike behavior of an electron in an atom. Most of the electrons, each with its own spin quantum quantity s, will occupy every one of these orbitals.

Orbital holds electrons that range in an asset called spin. Orbital: A area of space within an atom in which an electron in a given subshell can be found. Any orbital can preserve most of the 2 electrons with contrary spin. the primary shell has one 1s orbital and holds 2 electrons.

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At standard temperature and pressure, the number of gaseous molecules that the flask contains is equal to 1.2098 × 10^23.

According to the given data, the volume of the flask is equal to 4.50 L.

As the volume occupied by one mole of any gas at standard temperature and pressure is 22.4 liters, therefore the number of moles in the flask can be calculated as follows;

n = 4.5 ÷ 22.4

n = 0.2009

As one mole is equal to 6.02 × 10^23 units

The number of gaseous molecules in the flask can be calculated as follows;

0.2009 × ( 6.02 × 10^23 ) = 1.2098 × 10^23

Hence, the number of gaseous molecules in the flask is calculated to be 1.2098 × 10^23.

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1. The number of moles of H in 5 moles of C₂H₄O is 20 moles

2. The number of atoms of H in 5 moles of C₂H₄O is 1.20×10²⁵ atoms

1. How to determine the number of mole

The number of moles of H in 5 moles of C₂H₄O can be obtained as follow:

1 mole of C₂H₄O contains 4 moles of H

Therefore,

5 moles of C₂H₄O will contain = 5 × 4 = 20 moles of H

Thus, the number of moles of H is 20 moles

2. How to determine the number of atoms

We know from the calculation made above that 20 moles of H is present in 5 moles of C₂H₄O. Thus, we can obtain the number of atoms as follow:

From Avogadro's hypothesis,

1 mole of H = 6.02×10²³ atoms

Therefore,

20 moles of H = (20 moles × 6.02×10²³ atoms) / 1 mole

20 moles of H = 1.20×10²⁵ atoms

Thus, the number of atoms of H present is 1.20×10²⁵ atoms

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Answer:

What is class??

Explanation:

please tell the topic

According to the mole concept, there are 0.02 moles in 6.2 g of calcium phosphate.

According to mole concept,mole is defined as the unit of amount of substance . It is the quantity measure of amount of substance of how many elementary particles are present in a given substance.

It is defined as exactly 6.022×10²³ elementary entities. The elementary entity can be a molecule, atom ion depending on the type of substance. Amount of elementary entities in a mole is called as Avogadro's number.

It is widely used in chemistry as a suitable way for expressing amounts of reactants and products.For the practical purposes, mass of one mole of compound in grams is approximately equal to mass of one molecule of compound measured in Daltons. Molar mass has units of gram per mole . In case of molecules, where molar mass  in grams present in one mole  of atoms is its atomic mass.

In the given problem, number of moles is found out by, mass/molar mass

that is,6.2/310= 0.02 moles.

Hence, there are 0.02 moles in 6.2 g of calcium phosphate.

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Answer:

The average atomic mass for an element is calculated by summing the masses of the element's isotopes, each multiplied by its natural abundance on Earth. Since beryllium has only one naturally occurring isotope. The average atomic mass of beryllium is the mass of Be-9 isotope multiplied by 100%.

Explanation:

The best solvent choice for this analysis will be 50% hexanes in ethyl acetate.

Ethyl acetate having a molecular weight of 174.28, is observable in chromatography paper.

In the chemical examination, chromatography could be a research facility strategy for the partition of a blend into its components.

The blend is broken down into a liquid dissolvable (gas or fluid) called the versatile stage, which carries it through a framework (a column, a capillary tube, a plate, or a sheet) on which a fabric called the stationary stage is settled.

Since the distinctive constituents of the blend tend to have diverse affinities for the stationary stage and are held for distinctive lengths of time depending on their intuition with their surface destinations causing them to partition.

The partition is based on the differential dividing between the portable and the stationary stages. Unpretentious contrasts in a compound's parcel coefficient result in differential maintenance on the stationary stage and hence influence the division.

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Both physical and chemical properties can be used for identification of chemical substance and hence all the given statements are correct.

These properties are defined as those properties which become evident during or after a chemical reaction after the identity of the substance is changed during chemical reaction.

These properties cannot be determined externally just by viewing the substance ,these change immensely after a substance undergoes a chemical change.These are used for identification of unknown substances and for building up chemical classifications.

The major chemical properties are flammability,toxicity,reactivity,acidity and heat of combustion.For a chemical property to be apparent , it is necessary that the structure of the substance is altered.

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The mass of an atom of chlorine 37 is heavier than the mass of an atom of chlorine 35.

The mass number of atoms is the sum of the protons and neutrons in the nuclei of atoms.

Mathematically:

Mass number = number of protons + number of neutrons

The protons are the positively charged particles located in the nuclei of atoms while the neutrons are neutrally charged particles found in the nuclei of atoms as well.

Both proton and neutron numbers determine how heavy an atom would be. Electrons of atoms are usually located outside the nuclei and contribute a negligible amount to the weight of atoms.

Thus, a chlorine atom with an atomic mass of 37 is heavier than a chlorine atom with a mass of 35.

Although both atoms are from the same elements, they are called isotopes. Isotopes of the same element have the same proton number but different mass numbers.

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Energy transfers between particles when they collide.

When the particles collide they vibrate and energy get transferred between the particles. The particles that made matter are in constant motion and have high kinetic energy. kinetic energy is equal to heat. Energy is the ability to do work. When energy moves from one place to another place we can say that energy is transferred . so in case of particle s, particles are in continuous motion and colloid with each other and when the particles collide with each other the energy transfer between particles takes place.

Thus, Energy transfers between particles when they collide.

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The value of R from the ideal gas equation is 0.082 atm.L/K/mol.

The ideal gas equation is the equation that shows the relationship between pressure, and volume. moles of a gas and the temperature of a gas under ideal conditions.

The ideal gas equation is given below as follows:

PV = nRT

At standard temperature and pressure, the values of the variables are given below;

Pressure, P = 1 atm

Volume, V = 22.4 Liters

Number of moles, n = 1 mole

Temperature, T = 273.15 K

R = PV/nT

R = 1 * 22.4 / (273.15 * 1)

R = 0.082 atm.L/K/mol

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AConduction

B. Radiation

C. Convection

nswer:

Explanation:

the diagram of downs cell

Answer:

Explanation:

answer is below

         Red blood cells contain hemoglobin. When carbonic acid, which is found in tissues, is present, hemoglobin releases the bound oxygen. The oxygen that is attached to hemoglobin is released into the blood's plasma and taken up by the tissues in the capillaries, which are also where carbon dioxide is created.

          If more air is exchanged, the partial pressures of the outside atmosphere will approach but never reach them due to the remaining volume.

      Combustible Oxide : The dissociation curve shifts to the left as a result of one CO molecule binding to hemoglobin increasing the affinity of the other binding locations for oxygen.

       Lower CO2, greater pH, and lower temperature all move oxygen dissociation to the left.

       The pCO2 is significantly influenced by two variables. The person's breathing rate and depth are the first thing to consider. Someone who is hyperventilating will "blow out" more CO2, which will lower pCO2 levels. Holding one's breath causes CO2 to be retained, which raises pCO2 levels.

      Limited pressures : There are two reasons why the alveolar oxygen partial pressure is lower than the ambient O2 partial pressure. First, the upper airway humidifies the air as it reaches the lungs, lowering the partial pressure of oxygen to around 150 mmHg while increasing the partial pressure of water vapour (47 mmHg).

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The total pressure on Everest would be 34 kPa (or one-third of 102 kPa), and the partial pressure of oxygen would be 34 0.208 = 7.07 kPa.

Atmospheric pressure is the amount of force a given atmospheric column exerts relative to its size. At Mount Everest's summit (8848 m above sea level), the atmospheric pressure is 253 mmHg. The risk to a climber's life at high altitudes may come from the altitude itself. Since atmospheric pressure decreases with altitude, it is 33% lower at the summit of Everest than it is at sea level. Air pressure increases as air density decreases and air thickness increases. The density of air is influenced by a variety of factors. Most significantly, air becomes less dense as altitude rises, lowering atmospheric pressure.

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Molarity :

The number of moles of solute per liter of solution is known as molarity or molar concentration. It is used to express the concentration of a given solute in a solution.

It can be calculated using the formula, Molarity = [tex]\frac{number-of- moles-of-solute}{Volume-of-the-solution-in-liters}[/tex]

Given data:

Mass of the solute ( Cu(NO3) ) = 52.31 g

Volume of the solution = 1400 mL = 1.4 Liters,

Then, Molar mass of the solute = 125.55 g/mol

Then, number of moles of solute = [tex]\frac{mass of solute}{molar mass of solute}[/tex]

                                                        = [tex]\frac{52.31}{125.55}[/tex] = 0.417 mole

Then, Molarity = [tex]\frac{0.417}{1.4}[/tex] = 0.298 M

Therefore, the molarity of solute in the resulting solution is = 0.298 M

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Glyceryl tributyrate will react with 3 mol of water and form a glycerol and 3 mol of carboxylic acid.

The pKa of the weak acid, based on the titration results, is 4.24.

Only the half-equivalence pH is needed to answer this.

At the half-equivalence point of the titration, half of the monoprotic acid HA has been neutralized and converted to the appropriate salt. That means that the concentration of the acid [HA] is equal to the concentration of its anion [A⁻]. Now, we can consult the Henderson-Hasselbalch equation:

[tex]pH = pKa + log\frac{[A^{-} ]}{[HA]}[/tex]

Because [A⁻] = [HA], that means that:

[A⁻]/[HA] = 1

log(1) = 0

pH = pKa

So, at the half-equivalence point in the titration of the weak acid the pH value of the solution is equal to the pKa value of the weak acid, so pKa = 4.24

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The final pressure of the balloon that was initially filled with a volume of 2.20L to 3.86L is 430.3mmHg.

The pressure of a gas can be calculated using the Boyle's law equation as follows:

P₁V₁ = P₂V₂

Where;

According to this question, the volume of a balloon filled with He at 755 mmHg is expanded from 2.20L to 3.86L at a constant temperature. The final pressure can be calculated as follows:

755 × 2.2 = P₂ × 3.86

1661 = 3.86P₂

P₂ = 430.3mmHg

Therefore, the final pressure of the balloon that was initially filled with a volume of 2.20L to 3.86L is 430.3mmHg.

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This conclusion is wrong; because the covalent molecules do not conduct electricity.

A covalent bond is created when one or more pairs of electrons are exchanged between two atoms. The two atomic nuclei are drawing these electrons in unison. A covalent bond is created when there is not enough room between the electronegativities of two atoms for an electron transfer to occur and produce ions.

The atoms associate in a covalent bond by exchanging electrons. Typically, nonmetals form covalent connections with one another. For instance, each hydrogen (H) and oxygen (O) share two electrons to form the molecule of two hydrogen atoms singly linked to one oxygen atom that is known as water (H₂O).

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The effects of using a pair of large balloons

Number 4=Tetrahedral,normally= 109.5

Number 5: Triangular bipyramidal,normally= 120 and 90

Number 6: Octahedral, normally= 90

The binding angles wouldn't be the same. The figures are distorted because there are balloons of various sizes. It resembles how a triangle's side changes in size. The angles (60) are equal while all the sides are the same length, but when a side length (or, in this example, balloon size) is changed, the uniformity of the angle measurements is messed up.

for

Number 4=Tetrahedral,

normally= 109.5

Number 5: Triangular bipyramid

normally= 120 and 90

Number 6: Octahedral

normally= 90

due to the fact that helium molecules are substantially smaller than the nitrogen and oxygen molecules that make up the majority of the air. As a result, helium will leak through connections and seals considerably more quickly than usual, as well as through the rubber used to produce ordinary balloons. It struggles to pass through mylar balloons that have been aluminized.

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A Hydrate is a compound containing H2O molecules. The best-known hydrates are crystalline solids that lose their fundamental structure from the removal of bound water.  Some examples of hydrate are Glauber's Salt ( sodium sulfate decahydrate, Na2.SO4.10H2O), Washing soda ( sodium carbonate decahydrate, Na2CO3∙10H2O), and the double salts known as alums.

In many cases, hydrates are coordination compounds CuSO4∙5H2O is actually [Cu(H2O)4]SO4∙4H2O where four molecules of water of hydration are coordinated to copper ion. Similarly, MgSO4.7H2O is actually [Mg(H2O)6]SO4∙4H2O.

Noble gases and hydrocarbon gases form crystalline hydrates called clathrate compounds which are relatively at low temperatures and pressure.

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The final pressure of the ideal gas is 23.47 atm.

We need to know about the ideal gas theory to solve this problem. The ideal gas is assumed that there is no interaction between particles in a gas. It can be determined by the equation

P . V = n . R . T

where P is pressure, V is volume, n is the number of moles gas, R is the ideal gas constant (8.31 J/mol.K) and T is temperature.

From the question above, we know that

V1 = 120 L

P1 = 18 atm

T1 = 310 K

V2 = 95 L

T2 = 320 K

When the initial and final gas is the same, we can use the ratio of the ideal gas as

(P2 . V2) / (P1 . V1) = T2 / T1

(P2 . 95) / (18 . 120) = 320 / 310

P2 = 23.47 atm

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Answer: Graphite is a soft lubricant and good conductor of electricity as it pi bonds.



Explanation: Brushes collect the current due to the induced emf from the armature coils. When a brush is at any particular commutator segment, it shorts out that particular coil and draws current from the rest of the coils.

If the brush is not exactly at the particular segment, say one half is in one segment and other half is in a different one, then it draws current in that proportion.

But the thing remains that, at any particular moment of time, the brushes are always shorting one coil. Now as it is a short circuit, if emf is induced in that coil, huge current will flow. To prevent this, brushes are positioned in such a way that the coil being short circuited has no induced emf in it.

Answer:

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Explanation:

the sentence is

Answer: Benzylic hydrogen refer to the hydrogen atoms attached to the carbon atom just next to the benzene group. In ethyl benzene carbon next to benzene has two hydrogen atoms only.

Explanation: For example, among the inorganic compounds, oxides contain O 2− ions or oxygen atoms, hydrides contain H − ions or hydrogen atoms, sulfides contain S 2− ions, and so forth.

A molecule with strong intermolecular forces will have a weak or low vapor pressure.

Molecules generally with a high intermolecular force of attraction will have a low vapor pressure. This is because since the force of attraction between molecules is high as they are tightly packed, only fewer molecules will get a chance to move with kinetic energy at a given temperature.

Whereas, molecules with weak intermolecular force can travel easily and escape and so will have a greater vapor pressure. But it is not the case with strong intermolecular forces. Molecules with high vapor pressure are called volatile. Therefore, the molecules with strong intermolecular forces will have a low vapor pressure, and only that is expected to happen in such cases.

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Answer:

Explanation

Finally, we can calculate the surface-area-to-volume ratio of the nanoparticle by dividing 4750 nanometers squared by 18750 nanometers cubed. It is important to place the surface area first because that is what the problem is asking us to compare.

If mercury (ii) oxide is heated and decomposes, the product of the reaction be 4 Hg.

Mercury is a chemical element with the atomic number 80 and the symbol Hg. Formerly known as hydrargyrum and also known as quicksilver, In order to fragment anything into smaller pieces or to break it into smaller pieces, mercury is used in thermometers, barometers, manometers, sphygmomanometers, float valves, mercury switches, mercury relays, fluorescent lights, and other devices: Methane and carbon dioxide are produced when microbes break down organic waste. staying fresh while decomposes The process of recycling nutrients that an organism (plant or animal) has utilized to develop its body begins with decomposes. It is the process by which the decomposing dead tissues transform into more basic organic forms. For a large number of the species at the base of ecosystems, these serve as a food supply.

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Explanation

Given:

mass of glycol = 0.250g

mass of solvent (water) = 40g = 0.04 Kg

i = 1

Required: The boiling point of the solution

Solution

where Kb is the boiling point elevation constant

m is the molal concentration (molality) of all species

Step 1: Find the moles of glycerol

n = m/M

n = 0.250g/92,09382 g/mol

n = 2.71x10^-3 mol

Step 2: Find the molality

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

molality = 2.71x10^-3/0.04Kg

molality = 0.068 m

Step 3: Find the change in temperature

Kb of water = 0.512 cm^-1

DT = 0.512 x 0.068

DT = 0.035 'C

Step 4: Find the boiling point

Boiling point of water = 100 'C

DT = 0.035 'C

New boiling point =100 + 0.035 = 100.035 'C

Answer

100.035 'C