Calculate the radius of a palladium atom in nano-meters, given that pd has an fcc crystal structure, a density of 12.0 g/cm3 , and an atomic weight of 106.4 g/mol.

The empirical formula of the original compound given the combustion analysis data is CH₂O

Mass of C = (12 / 44) × 51.29

Mass of C = 13.99 g

Mass of H = (2 / 18) × 20.99

Mass of H = 2.33 g

Mass of O = (mass of compound) – (mass of C + mass of H)

Mass of O = 35 – (13.99 + 2.33)

Mass of O = 18.68 g

Divide by their molar mass

C = 13.99 / 12 = 1.1658

H = 2.33 / 1 = 2.33

O = 18.68 / 16 = 1.1675

Divide by the smallest

C = 1.1658 / 1.1658 = 1

H = 2.33 / 1.1658 = 2

O = 1.1675 / 1.1658 = 1

Thus, the empirical formula of the compound is CH₂O

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If 1 mL of diamond has a mass of 3.51 g and 1 carat = 0.200 g, cullinan diamond is of 2795.7 carats.

Given,

Volume of uncut diamond is 177mL

1mL = 3.51 gram

and 1 carat = 0.200 gram

then we have to find out weight of cullinan diamond in carats.

Cullinan diamond is of 177mL volume that means

177 × 3.51 = 621.27 grams

If 1 carat = 0.200grams

then 1 gram = 4.5 carats

621.27 grams = 621.27 × 4.5 = 2795.7 carats

Hence, cullinan diamond is of 2795.7 carats.

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Answer:

Noble gases are the least reactive of all elements. That's because they have eight valence electrons, which fill their outer energy level. This is the most stable arrangement of electrons, so noble gases rarely react with other elements and form compounds.

The standard Gibbs free energy for the given redox reaction is -106kJ/mol.

The standard Gibbs free energy (ΔG°) is a thermodynamic potential that can be used to calculate the maximum reversible work that may be performed by a thermodynamic system under standard conditions.

To find the Gibbs free energy, first we have to know about the redox reaction,

10 Cl⁻(aq) + 2 MnO₄⁻(aq) + 16 H⁺(aq) ⇒ 5 Cl₂(g) + 2 Mn²⁺(aq) + 8 H₂O(l)

As we have to analyze the standard reduction potentials (E°red).

Cathode: 2 MnO₄⁻ + 16 H⁺ + 10 e⁻ ⇒ 2 Mn²⁺ + 8 H₂O

E°red = 1.51 V

Anode: 10 Cl⁻ ⇒ 5 Cl₂ + 10 e⁻                                      

E°red = 1.40 V

Then, the potential difference between the cathode and anode is called the standard cell potential.

E°cell = E°red, cathode - E°red, anode

         = 1.51 V - 1.40 V

         = 0.11 V

The standard cell potential is 0.11 V.

The Gibbs free energy can be calculated as,

ΔG° = - n × F × E°cell

ΔG° = - 10 mol × (96,485 J/V.mol) × 0.11 V × (1 kJ/1000 J)

      = -106 kJ/mol

where,

n - moles of electrons exchanged.

F -Faraday's constant.

The standard Gibbs free energy for the given redox reaction is -106kJ/mol.

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answer:

a. true

explanation:

carbon is found in all organic compounds; it's the main compound. it's essential to life and without it earth would be nonexistent.

The following are the results of the unit conversions as shown in the question;

1) 43900 Pa

2)  71.3 Pa

3)  5.36 * 10^-3 L

4) 0.586 g

5) 9.37 * 10^-7 L

We know that conversion from one unit to another is performed by the use of conversion factor. We know that we could carry out these conversions from one unit to another in order to improve the ease at which we are able to perform a calculation.

We know that dimensions are very important when we are trying to effect the conversion. Let us now try to effect each of the conversions as shown;

1) 4390000 * 1 Pa/100c Pa = 43900 Pa

2) 0.0713 kPa * 1000 Pa/1 KPa = 71.3 Pa

3) 53.6 dL * 1 L/10000 dL = 5.36 * 10^-3 L

4) 586 mg * 1 g/1 * 10^3 = 0.586 g

5) 0.937 μL * 1 L/1 * 10^6  μL = 9.37 * 10^-7 L

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"Energy can be neither created nor destroyed but can only be converted from one form to another" In the above case liquid is converted to gas keeping the mass of the molecules the same.  The energy lost while evaporating is conserved.

The water evaporates into water vapor, where the total water molecules remain the same, the molecules are just spread out over a greater volume but the mass remains the same.

Evaporation occurs when a molecule gains or loses energy, and it exists in the form of heat. This is how the energy is conserved during evaporation.

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Answer:Diagram of the nuclear composition and electron configuration of an atom of yttrium-89 (atomic number: 39), the most common isotope of this element. The nucleus consists of 39 protons (red) and 50 neutrons (blue). 39 electrons (green) bind to the nucleus, successively occupying available electron shells (rings).

Explanation:Need brainliest award

Answer:

Explanation:

39

The pressure of an ideal gas is directly proportional to its absolute temperature.

The pressure of an ideal gas  is directly proportional to absolute temperature at constant volume.The volume of a gas is also directly proportional to it's absolute temperature at constant pressure.

When a constant volume of gas is held, the pressure of gas increases as the temperature increases. Mathematically it can be expressed as:

                                P∞T

In order to remove proportionality sign an equal sign is introduced with a proportionality constant 'K',thus the equation becomes

                                P=KT

On dividing both sides of above equation by T , equation becomes

                                 P/T=K

When a plot of pressure versus temperature is plotted a straight line graph is obtained passing through the origin.

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The statement which best describes the difference between dissolution and melting is that dissolution involves the formation of a new substance, while melting involves a state change and is denoted as option A.

This is the process in which a solute dissolves in a solvent such as water to form a solution thereby resulting in a new substance being created.

Melting on the other hand is the process in which a solid phase is changed into a liquid phase with the application of heat which makes the atoms move more freely.

This is therefore the reason why option A was chosen as the most appropriate choice.

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Answer: It has a lower boiling/melting point than the water

A 100 gram gold nugget contains 5 grams of gold.

Then Percentage of gold in the gold nugget is

(5/100)*100 =5%.

A % in mathematics is a quantity or ratio that is stated as a fraction of 100 (from the Latin per centum, "by a hundred"). Although the abbreviations "pct.", "pct.", and occasionally "pc" are also used, the percent symbol, "%," is frequently used to indicate it. A % lacks dimensions and has no associated unit of measurement.

If there are 50 male pupils for every 100 overall students in the class, 50 of them will be male. There are 250 male students out of 500 total.

Long before the decimal system was developed, computations were frequently done using fractions that were multiples of one hundred.

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The key factors  that determine the stability of a nucleus are neutron /proton ratio and  total number of nucleons in the nucleus.

Nuclear stability is determined by neutron/proton ratio and the total number of nucleons.Stable nuclei with atomic numbers up to 20 have neutron/proton ratio  of about 1/1.

For elements above atomic number 20 the number of neutrons is always greater than the number of protons which are  present along with neutrons in the nucleus of an atom.Such atoms are called stable isotopes.

No nucleus having number of nucleons greater than 208 is stable. This arises due to the fact when the nuclear force becomes 100 times , it operates only on very short distances .

When the nucleus attains a certain size,the strong force of attraction is no longer capable of holding the nucleus together.

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Electrical conductivity can be used to determine the bond type because there are valence electrons that are not able to conduct electricity while free electrons can conduct electricity.

The valence electrons can be defined as those having a negative charge that are linked to atomic particles, while the free electrons do not form atomic particles in the sense they are unbound to atomic particles.

In conclusion, electrical conductivity can be used to determine the bond type because there are valence electrons that are not able to conduct electricity and while free electrons can conduct electricity.

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A block of lead has dimensions of 5.50 cm by 6.20 cm by 8.00 cm. The block weighs 1587g. The density of lead is 11.30 g/cm³.

Density is a scalar quantity. It is calculated by dividing mass by volume.

Given, Length = 4.50 cm

Width = 5.20 cm

Height = 6.00 cm

Mass of lead = 1587 g

First, calculate the volume

Volume = l x b x h

Volume = 4.50 x 5.20 x 6.00

Volume = 140.4 cm³

we calculate the density of lead

1587 /  140.4 =

Density = 11.30 g/cm³

Therefore, the density of lead is  11.30 g/cm³.

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Hence , the molecular formula for azt is C₁₀H₁₃N₅o₄ which is option (d) .

The molecular formula for azt is C₁₀H₁₃N₅o₄

In this formula, there area unit 10 carbon atoms and 13 H atoms and 5 nitrogen atoms and 4 oxygen atoms within the given compound.

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There are three primary ways that the animal cell membrane keeps things in balance: enabling the membrane to flow fluidly, controlling the process by which water moves from a high concentration to a low concentration, and maintaining particular ion concentrations.

Negative feedback loops keep homeostasis in check. Positive feedback loops may be necessary for life to exist even when they actually push the organism further away from homeostasis. The neural and endocrine systems of mammals regulate homeostasis.

For instance, an animal must use the thermoregulation mechanism to control body temperature. Cold-adapted organisms, like the polar bear, have physical characteristics that enable them to survive extreme cold and retain body heat. Fur, feathers, blubber, and fat have structures that help with this kind of insulation.

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The major organic compound is 2,2-dibromoheptane.

Any of a vast group of chemical compounds known as organic compounds contain one or more carbon atoms that are covalently connected to atoms of other elements, most frequently hydrogen, oxygen, or nitrogen. Carbides, carbonates, and cyanides are among the few carbon-containing substances that aren't categorized as organic.

Organic compounds make up about one-third of all industrially manufactured substances. Organic compounds make up the majority of foods, medications, clothing fibers, and plastics, as well as all living things. Many different fields can benefit from the identification of organic molecules. Scientists have just created a new technique dubbed "material degradomics" to track the deterioration of antiquated books and historical artifacts. Paper develops the well-known "old book smell" when it ages due to the emission of organic chemicals in gaseous form.

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it can change everything

The Isotopic symbol of the element that has a mass number of 119 and has 69 neutrons is ₅₀¹¹⁹Sn.

Atomic number is the number of protons present in the nucleus of the atom of an element.

The mass number is the sum of the protons and neutrons present in the nucleus of the atom of the element.

The mass number of the element = 119

The neutron number = 69

The atomic number = 119 - 69

Atomic number = 50

The element with atomic number 50 is Tin with symbol Sn.

The Isotopic symbol of the element is ₅₀¹¹⁹Sn.

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Color. A substance's changing color does not always mean that something has changed chemically. For instance, altering a metal's color does not alter its physical characteristics.

A substance's shape is a physical attribute, and any modification of a physical property cannot be interpreted as a sign of a chemical modification.

In essence, a physical change does not result in the creation of a new material, whereas a chemical change does.

While undergoing a physical change, a material may change shape or form, but no chemical processes take place, and no new compounds are created.

Therefore, a change in color is not a sign of a chemical reaction.

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Widely separated, moving at random describes the molecules in very dilute sugar solution at room temperature.

This is attributable to the fact that sugar is soluble in liquid water under all conditions of pressure and temperature. From about 180g of sugar in 100ml of water at 0 degrees to about 490g in 100ml of water at 100 degrees, the solubility of sugar does increase with temperature. As the saturated concentration rises, the solution will become unsaturated. Temperature increases the solubility.

In general, sugar dissolves more readily at higher temperatures than it does at lower ones. Because the molecules in hot water (or coffee) move more quickly and are spaced farther apart, the sugar can mix with them more easily. In fact, sugar is very soluble; it just isn't at lower temperatures.

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Answer:

a. highest point

Hydrogen of mass of 2.625kg is required to produce 3.3kg of ammonia.

The mass of a physical body is a measure of its entire makeup. Inertia, or the body's opposition to acceleration when a cumulative force is applied, is also measured by this term. The strength of a body's gravitational pull on other bodies is also influenced by its mass. In an ionic crystal, formula mass is the total atomic mass of all the atoms that make up the formula unit. The amount of a material that is equivalent to its molecular mass in grams is referred to as its molar mass. Usually, It is measured in grams (g) or kilograms (kg).

Given:

Mass, m of [tex]NH_3[/tex] = 3.3kg

Molar mass, mm of [tex]NH_3[/tex] = 17g/mol

To find:

Mass of [tex]H_2[/tex] = ?

Reaction:

[tex]N_2 (g) + 3H_2 (g) \rightarrow 2NH_3 (g)[/tex]

Formula:

[tex]nNH_3[/tex] = mass/molar mass

moles of N, [tex]nN = \frac{nNH_3}{\% yield}[/tex]

moles of H = [tex]\frac{3}{2} nN[/tex]

mass of H = moles of H x molar mass of H

Calculations:

n = 3300 / 17

n = 194.12 mol

moles of N, nN = 194.12 / 0.224

nN = 866.61 mol

1 mol required [tex]\frac{3}{2}[/tex] mol [tex]NH_3[/tex]

moles of H, nH = [tex]\frac{3}{2} * 866.61[/tex]

nH = 1299.92 mol

mass of hydrogen, m = 1299.92 x 2.02

m = 2625.84g

m = 2.625kg

Result:

The mass of hydrogen required is 2.625kg.

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1.64 hours will be taken to plate out 8.90g of nickel.

Nickel (Ni), is a chemical element and Group 10 ferromagnetic metal with high resistance to oxidation and corrosion. Although nickel is more important either as a pure metal or in the form of alloys for its various home and industrial applications, it is also known for being silvery white, robust, and tougher than iron.

Iron and the element nickel extremely seldom co-occur in terrestrial and meteoric deposits. Baron Axel Fredrik Cronstedt, a Swedish chemist and mineralogist, separated the metal in 1751 after preparing an impure sample from an ore containing niccolite. Earlier, a similar ore of this kind was given the nickname Kupfernickel in honor of "Old Nick" and his naughty gnomes because, while looking like copper ore, it produced a brittle, foreign metal.

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Answer:

Boiling Water

Explanation:

Boiling water is a physical change because the gaseous water produced is chemically identical to the liquid water i.e both of them have the same molecular structure of the water

The angle between sulfur-bromine bonds in SBr6 is 90°.

Sulfur hexabromide(SBr6), is a chemical compound with the hybridization of one s orbital, three p orbitals, and two d orbitals.

Hence, the hybridization of the central atom i.e, Sulfur in this compound is sp3d2.

As the compound has a hybridization of sp3d2, its shape is octahedral, as shown in the adjoining image.

As it is visible from the structure of SBr6, all angles between Sulfur and bromine are equal and their value is 90°.

Thus, the angle between sulfur-bromine bonds in SBr6 is 90°.

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The most abundant isotope here is 259Q.

We know that isotopes refers to those atoms of elements that have the same atomic number but different mass numbers. The reason for the difference in the mass number is because they do not have the same number of neutrons. Recall that the mass number is the sum of the number of protons and neutrons in the nucleus of an atom.

The existence of isotopy is the reason why the relative atomic masses of elements are not whole numbers.

Note that the isotopes are not abundant to the same extent. The isotopes that are are more abundant tend to affect the value of the relative atomic mass. The relative atomic mass is nearest in value to the mass of the most abundant individual isotope.

As such, the most abundant isotope here is 259Q.

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The most abundant isotope of iridium is Iriduium-192.

An element is composed of isotopes. The isotopes of an elements have different mass numbers but the same atomic number. These difference in the mass number is caused by differences in the number of neutrons.

Hence, we can see that all elements do have isotopes. The chemical and physical properties of isotopes may be the same save that the rate of reaction of the individual isotopes may slightly differ. The most abundant isotope has the highest length in the mass spectrum.

We can see that there are three isotopes of Iridium that are common. The most abundant isotope of iridium is Iriduium-192.

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The process of diluting 1.2 m nh4cl solution to prepare 1.4 l of a 0.25 m nh4cl solution. To determine if each of the follow statement is true or false.

The assertion is true.

What is dilution?

By incorporating more solvent, dilution refers to the process of lowering a solute's concentration in a solution. We increase the solvent without increasing the solute in a solution to dilute it. After that, we vigorously mix the resulting solution to make sure that it is evenly distributed throughout.

The assertion is true.

(1) The equation for dilution

A balance of moles of the solute, in this case NH4Cl, is expressed as M1V1 = M2V2.

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