How much faster does ²³⁵UF₆ effuse than ²³⁸UF₆?

Ionic bonds form between metals and nonmetals.

Ionic bonds, also known as electrovalent bonds, are a type of linkage created in a chemical molecule by the electrostatic attraction of ions with opposing charges. When the valence (outermost) electrons of one atom are permanently transferred to another atom, a bond of this kind is created.

If an atom receives electrons, it becomes a negatively charged ion (anion), but if it loses them, it becomes a positively charged ion (cation).

An ionic bond is essentially the most extreme form of a polar covalent bond, with the latter occurring when electrons are shared unevenly as opposed to fully. Covalent bonds arise when the electronegativities of the two atoms are similar, but ionic bonds often form when there is a large difference. Covalent bond is compared.

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The bonds with more polarity are a)C-Cl, b)Si-Cl and c)N-Mg

The electronegative values are indicated by the term e, whose highest difference values indicate that the bond is highly polar. For the given values,

a) C-H and C-Cl, the Electro Negativity difference between C-Cl is 3.16-2.55 = 0.61 and electronegativity between C-Cl is 2.55-2.1 = 0.45. Since the electronegativity of C-Cl is greater than the electronegativity of C-H, C-Cl is more polar.

b)The electronegativity of Si-Cl is 3.16-1.9 = 1.26 and electronegativity of Si-Li is 1.98-0.98 = 0.98. Since the electronegativity of Si-Cl is greater than Si-Li, it is more polar.

c) In N-Cl and N-Mg, the Electro Negativity difference between N-Cl is 3.16-3.04 = 0.12, and the electronegativity between N-Mg is 3.04-1.31 = 1.73 Since the electronegativity of N-Mg is greater than the electronegativity of N-Cl, N-Mg is more polar.

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Answer: 6.04 x 10^22 N atoms

Explanation:

Molar mass Pb(NO2)2 = 299.21 g

Avogadro constant: 6.022 x 10^23

(15 g Pb(NO2)2)/299.21 g/mol * 2 = 0.100264028 mol of Nitrogen

0.100264028 mol of Nitrogen * (6.022 x 10^23 atom) = 6.04 x 10^22 Nitrogen atoms

The element given in the diagram is molybdenum with symbol Mo and atomic number 42. The number of protons and electron is 42 and the atomic mass is 96.

Number of neutrons is 54. Electrons in the valence shell is 6 and number of electrons in n=3 shell is 18.

Molybdenum is 42nd element in periodic table. It is a transition metal with d4 valence shell. The atomic number of molybdenum is 42. The atomic number is the number of electrons in an atom. Thus number of electrons is 42.

Mass number of Mo is 96 it is the sum of number of protons and neutrons.

For a neutral atom, the number of electrons equal to the number of protons. Thus number of protons is 42.Number of neutrons can be found by substracting proton number from mass number.

number of neutrons = 96 -42 =54.

The electronic configuration of Mo is 2,8,18,13,1. The last 6 electrons are located in 4s and 4d orbitals. Thus number of valence electrons is 6.

The shell n = 3 is M shell. The M shell of Mo contains 18 electrons.

Therefore Molybdenum Mo is 42 nd element with protons, electrons and neutrons 42, 42, 54 respectively and have 6 outer shell electrons and 18 electrons in n=3 shell.

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The equilibrium expression of the given chemical equation Kc =

[tex]\frac{(CaCO_{3} ) (H_{2} )^{4} }{(CaO) (CH_{4} ) (H_{2} O)^{2} }[/tex]

Equilibrium expression of a chemical equation is defined as the equations equilibrium constant which is the rate constant for the forward reaction divided by the rate constant for the reverse reaction.

The equilibrium expression (Kc)of a chemical equation can be written using the following formula:

KC= [C] [D].../[A] [B] ...

Therefore to show the equilibrium expression of the following equation:

Kc = [tex]CaO + CH_{4} + 2H_{2} O --- > CaCO_{3} + 4H_{2}[/tex]

kc = [tex]\frac{(CaCO_{3} ) (H_{2} )^{4} }{(CaO) (CH_{4} ) (H_{2} O)^{2} }[/tex]

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The periodic table is arranged into rows and columns by the atomic number and valence electrons.

The elements in periodic table arranged that element with same outer electronic configuration placed in same columns.

The formal names for rows in the table are called as periods and the columns in the table are called as groups.

Each element has their own atomic number , which we explained as number of proton of its atom and defined that element.  The elements of the periodic table are arranged in the way of increasing atomic number.

First two groups are s block element , 13 - 18 p block elements, in the middle d block elements are placed and f block elements are placed separately.

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A standard unit is a unit that can be used everywhere as a basic unit of measurement.

350g = 0.350 kg =3.5 x [tex]10^{-2}[/tex] kg

0.4 gl = 1514.16 ml = 1.5 x [tex]10^{3}[/tex] ml

Inches, pounds, and pints are examples of standard units of measurement. Steps, hand spans, cubes, counters, and sweets are examples of non-standard units of measurement.

A standard unit is a unit that can be used everywhere as a basic unit of measurement.

The SI is a coherent system of measurement that begins with seven base units: the second (symbol s, the unit of time), the metre (m, length), the kilogram (kg, mass), the ampere (A, electric current), the kelvin (K, thermodynamic temperature), the mole (mol, substance amount), and the candela (cd, luminous intensity).

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Reason : The number of protons in an atom of an element is its atomic number. particle 3 has 5 protons. Thus, its atomic number is 5 .

2)The atom is called an ion when its numbers of electrons are not equal to protons . meaning, an atom can be attracted to another atom.

in this case, particle 1 has protons =4 which is not equal to the 2 number of electrons.

Answer:

subtract the starting water level from the end water level to find the volume of the object so 65 ml - 30 ml =35 ml or 35cm cubed

1,500 is the answer i had to put more than 20 characters to write this answer

The Lewis structure shows the arrangement of the elements that are in the compound. The Lewis structure of the compound is shown in the image attached.

The Lewis structure is the structure that shows the way that the electrons that are in the molecule are arranged. The Lewis structure must involve the symbols of the elements that are in the compound as well as the number of electrons that are in each of the atoms.

Having said so, the Lewis structures of the compound could be shown in the image that is attached. The charges that are in each of the atoms have also been showed in the image.

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When a negatively charged substance is brought near the ion, the ion will attract the substance because the ion has more protons than electrons.

We define an ion as a specie that either has more negative charges than positive charges, or a specie that has more positive charges than negative charges. In either case, the number of charges that you have in an ion can never be the same, the  number of one type of charge must be greater than the number of the other type of charge.

We can now see that from the table that we have in the question, the number of the positive charges is greater than the number of the negative charges. This implies that what we have is a positive charge and in consonance with the first law of electrostatics, it is going to be attracted by the negative charge.

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Explanation:

We have a reaction between iron and oxygen from the air and Iron (III) oxide is produced.

First we have to determine the formulas of our compounds. Iron is a solid and its formula is just Fe. Oxygen is a diatomic gas and its formula is O₂. The formula of iron (III) oxide is Fe₂O₃. Why? Because the oxidation state (or charge) of oxygen in oxides is always 2- and the oxidation state or charge or iron in this case is 3+ (because between brackets we have the number III). Oxides are neutral compounds, if we want to form a neutral compound we will have to:

So the unbalanced reaction is:

___ Fe + ___ O₂ ---> ____ Fe₂O₃

The first step to balance an equation is to determine the number of atoms of each element that we have on both sides.

___ Fe + ___ O₂ ---> ____ Fe₂O₃

Fe: 1 Fe: 2

O: 2 O: 3

We have one atom of Fe on the left side of the equation and 2 atoms of Fe on the right side, so we have to change the coefficient for Fe on the left and write a 2.

2 Fe + ___ O₂ ---> ____ Fe₂O₃

Fe: 2 Fe: 2

O: 2 O: 3

Now Fe is balanced, but O is still unbalanced. We have 3 atoms of O on the right side of the equation and just 2 on the left side. The coefficient for O₂ that balances the equation should be 3/2.

2 Fe + 3/2 O₂ ---> ____ Fe₂O₃

Fe: 2 Fe: 2

O: 3 O: 3

But we can't have fractions as coefficients, they must be entire numbers. So we will have to multiply all the coefficients by 2 to get rid off the fraction.

4 Fe + 3 O₂ ---> 2 Fe₂O₃

Fe: 4 Fe: 4

O: 6 O: 6

Now the equation is balanced.

First, to determine the mass of iron (III) oxide we will have to convert 500.0 g of Fe into moles. To do that we need the molar mass of Fe. Then using the molar ratio between Fe and Fe₂O₃ we can find the number of moles produced. And finally with the molar mass of Fe₂O₃ we can find the mass of Fe₂O₃.

molar mass of Fe = 55.85 g/mol

molar mass of Fe₂O₃ = 159.69 g/mol

mass of Fe₂O₃ = 500.0 g of Fe * 1 mol of Fe/(55.85 g/mol) * 2 moles of Fe₂O₃/(4 moles of Fe) * 159.69 g/mol

mass of Fe₂O₃ = 714.8 g

Answer: the mass of iron (III) oxide produced is 714.8 g

a. The limiting reagent is [tex]H_2S[/tex]

b. The mass of the leftover reagent is 32.53 grams.

The limiting reagents or reactants in reactions are reagents that are available in inadequate stoichiometric quantity when compared to other reagents of the same reactions.

From the balanced equation of the illustrated reaction, the stoichiometric mole ratio of the two reactants is 1:1.

Recall that: mole = mass/molar mass

Mole of 49.8 g MgO = 49.8/40.30

                           =  1.2357 moles

Mole of 14.6 g [tex]H_2S[/tex] = 14.6/34.08

                           = 0.4284 moles

Since the mole ratio is supposed to be 1:1, it means  [tex]H_2S[/tex] is stoichiometrically limiting in availability. In other words,  [tex]H_2S[/tex] is the limiting reactant.

The excess reactant is MgO.

Excess moles = 1.2357 - 0.4284

                   = 0.8073 moles

Mass of 0.8073 moles MgO = 0.8073 x 40.30

                             = 32.53 grams.

Thus, the mass of the leftover reagent is 32.53 grams.

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The molar mass of a molecule corresponds to the sum of the atomic weights of each element multiplied by the number of atoms of the respective element. The atomic weights can be found in the periodic table. For each element the atomic weight is:

Cu=63.546u

S= 32.065 u

O4= 15.999u

The molar mass of the molecule will be:

Answer: The molar mass of CuSO4 is 159.607g/mol

A plant characteristic that would best "| a flowers that emit a rotten odor".

Hyenas belong to a specific class of carnivores known as scavengers. The carcasses of animals that scavengers did not slaughter are consumed by scavengers. The majority of hyenas hunt as well. An organism is referred to as a scavenger if it primarily feeds decaying biomass, including such animal or plant matter.

Animals that use the dead bodies of other animals even though sustenance are known as scavengers. Vultures, hyenas, coyotes, raccoons, etc. are a few examples.

The flowers which emit rotten odor attract most of the scavengers.

Thus, the correct option is A

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Answer: A O flowers that emit a rotten odor

Explanation: Did this in a test

Answer:

Qualitative Observation.

Explanation:

hope this helps.

Answer:

Qualitative.

Explanation:

The difference between quantitative and qualitative is that quantitative is more numerical such as using numbers while qualitative is more descriptive like this example that is describing the taste of something.

Examples:

(Quantitative)

She is 6ft 3in tall.

She goes shopping 5 times a week.

She ran 7 miles.

(Qualitative)

She is funny, smart and quiet.

They have curly, brown hair.

The water is color blue.

Answer:

The sun is a young star because it's composed of many gaseous layers and made up of Hydrogen/Helium and as shown on the graph we can see that's what young stars are made of meaning the sun is just a young star.

Explanation:

When two of those balls or partials are stuck (bonded) to each other, they represent atoms.

It is to be noted that Ball and stick models are three-dimensional models in which atoms are represented by different colored spheres and bonds are represented by sticks that connect the spheres. Colors are assigned to certain atoms; for example, black is commonly used to symbolize carbon while white is used to represent hydrogen.

An atom is the smallest ordinary matter unit that makes up a chemical element. Every solid, liquid, gas, and plasma is made up of atoms that are either neutral or ionized. Atoms are incredibly tiny, measuring around 100 picometers across.

Atoms are indestructible particles that cannot be generated or destroyed during a chemical process. Atoms of the same element have the same mass and chemical characteristics. Distinct elements' atoms have different masses and chemical characteristics. Atoms combine in modest whole-number ratios to produce compounds.

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Land masses are formed as a result of Tectonic forces.

Tectonic forces regularly arise while tectonic plates merge collectively or pull aside. This displaces Land masses, causing geographical functions and landforms to be created. for example,  tectonic plates pushing collectively ought to cause mountain tiers to form.

Like Lego blocks built on top of one another, big elements of the Earth's continental land loads had been created by way of tens of hundreds of short eruptions or bursts of molten magma that were transferred unexpectedly from the mantle and lower-maximum crust and then injected as huge horizontal sheets into the higher crust.

The phrase tectonic is derived from the Greek phrase tekton, which means “builder.” Tectonic techniques construct landforms in particular by using causing the uplift or subsidence of rock cloth—blocks, layers, or slices of the Earth's crust, molten lavas, or even huge hundreds that consist of the complete crust and uppermost.

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Answer:the 1 is oxygen 2 is gills the 3 is the heart the 4 is helium the 5 is cellulose

Explanation:

A chemical equilibrium is a state where the concentrations are not changing, in a closed system. the concentrations do not change not because the reactions are stopped but because the direct and inverse reactions are occurring at the same rate, this ongoing reactions is because it is considered a dynamic system.

The final volume of the balloon is 547.4 mL.

What is final volume?
The term "Final Volume" refers to the amount of Water Allocation (expressed as a whole number of Megalitres) that was determined in line with section 3.3 and was included in an Offer.

The balloon is filled to a volume of 665.7 mL at a temperature of 24.5°C. The balloon is then cooled

at constant pressure to a temperature of 188.7 K.
The ideal gas law states that PV = nRT, where P is

the pressure, V is the volume,
n is the number of moles,
R is the universal gas constant, and
T is the

temperature. Since the pressure is constant in this problem, we can rearrange the equation to solve for

V2, the final volume of the balloon: V2 = (n/P)RT. Plugging in the given values, we get:
V2 = (n/P)(8.3144621)(188.7)
V2 = 547.4 mL

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The density of ammonia is 00117 gm|M|.

We know D = MP/RT

Now, P = 1600 mm = 1600/760=2.10atm

∴D=[tex]\frac{17\times2.10}{821\times 373}[/tex]

D= 0.00117 gm|M|

Density of a material shows the density of that material in a  given area. The density of a material is defined as its mass per unit volume. Density is basically a measure of how tightly  packed a substance is. It is a unique physical property of a particular object. The principle of density was discovered by the Greek scientist Archimedes. Calculating density is easy  if you know the formula and understand the  units involved. The symbol ρ means density, or it can also be indicated by the letter D.

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d = 0.00117gm|M|

The density of ammonia gas is 0.00117gm|M|

Here we want to find density of ammonia gas,

The equation is,

                       d = MP/RT,

where d is the gas's density in g/L,

M is the gas's molar mass in g/mol,

P is the gas's pressure in ATM, and R is the gas law constant.

The equation shows that as the density of a gas increases, so does its molar mass.

given ,

M = 17.1 g/mol

P = 1600mmHg => (to convert to ATM) = 1600/760  = 2.10 atm

R= 8.31J/K⋅mol

T= 373°c

substituting values,

        d = (17.1 x 2.10) / 8.31 x 373

         d  = 0.00117gm|M|

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La idea principal de este texto es descifrar los mecanismos por los cuales la marihuana puede causar al excitacion de las neuronas y de este modo llevar a cambios en el cerebro. La idea secundaria es comprender el rol de la dopamina como neurotrasmisor. La opinion del autor es que el consumo prolongado de canabis podria estar asociado a daño irreversible.

Las celulas nerviosas (es decir, neuronas) reaccionan de acuerdo a la presencia de neurotrasmisores en el medio extracelular, este es uno de los mecanismos que usa el sistema nervioso para responder a estimulos ambientales.

La marihuana o cannabis posee substancias psicoactivas que se asocian a receptores presentes en las membranas neuronales de modo similar a neurotrasmisores naturales tales como la dopamina.

En conclusión, este estudio trata sobre los efectos de la marihuana como sustancia psicoactiva en el cerebro y del mecanismo de accion de los neurotrasmisores, lo cual se puede asociar a los efectos de esta droga en celulas neuronales.

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Assuming that it is at STP (Standard Temperature and Pressure), in these conditions, 1 mol of gas is equal to 22.4 Liters of volume, therefore if we have 80 Liters of H2 gas:

22.4 L = 1 mol

80 L = x moles

x = 3.6 moles of H2 gas

Al(s) + H₂SO₄(aq) --> Al₂(SO₄)₃(aq) + H₂(g)

Consider the unbalanced equation above. volume of H₂ (in L) will be produced at 52.0°C and 755 torr if 4.85 g of Al are reacted with 125. mL of 0.140M H₂SO₄ is 6.72 L.

The balanced given equation is :

2Al(s) + 3H₂SO₄(aq) --> Al₂(SO₄)₃(aq) + 3H₂(g)

mass of Al = 4.85 g

no. of moles of Al = mass / molar mass

                              = 4.85 / 26.98

                              = 0.17 mol

2 mole of Al produce 3 mole of  H₂

0.17 moles produced =  0.255 mole of  H₂

using the formula :

PV = nRT

P = 755 torr = 0.99 atm

R = 0.82 L atm / mol K

V = nRT / P

   = (0.25 × 0.082 × 325) / 0.99

  = 6.72 L

Volume of H₂ produced = 6.72 L

Thus, Al(s) + H₂SO₄(aq) --> Al₂(SO₄)₃(aq) + H₂(g)

Consider the unbalanced equation above. volume of H₂ (in L) will be produced at 52.0°C and 755 torr if 4.85 g of Al are reacted with 125. mL of 0.140M H₂SO₄ is 6.72 L.

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Given that carbonic acid, H₂CO₃, has a pKa1 = 6.37 and a pKa2 = 10.33,  if you want to make pH 7  buffer solution starting with NaHCO₃ , we add 0.10M HCL .

a) NaHCO₃ is salt of weak acid and a strong base . the initial pH is greater than 7 means it is basic and we should add 0.10 M HCL to the pH which is 7.

Thus, Given that carbonic acid, H2CO3, has a pKa1 = 6.37 and a pKa2 = 10.33,  if you want to make pH 7  buffer solution starting with NaHCO₃ , we add 0.10M HCL .

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Molecular weight of KCl = 74.55 g/mol

So, in 74.55 g of KCl = 1 mole of KCl is present

⇒ In 1 g of KCl = 1/74.55 mole of KCl

⇒ In 335.7 g of KCl = 1 x 335.7/74.55 moles of KCl

⇒ In 335.7 g of KCl, 4.503 moles of KCl are present.

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Answer:

Explanation:

We start by completing the balanced equation of the reaction.

We have that as:

Now, we want to get the limiting reagent

The limiting reagent is the reagent that produces less amount of the product

Now, let us get the number of moles of CaCO3 that reacted

That would be the mass of CaCO3 given, divided by the molar mass of CaCO3

The molar mass of CaCO3 is 100 g/mol

Thus, the number of moles of CaCO3 that reacted will be:

Now, let us get the number of moles of CO2 produced

That would be 0.0035 mol too since the mole ratio of CaCO3 to CO2 in the balanced equation of reaction is 1:1

We proceed to get the number of moles of HCl that reacted

We can get this by multiplying the given molarity by the volume in liters

We have that as:

From here, the number of moles of CO2 produced is half, since the mole ratio is 1 to 2

The number of moles of CO2 produced will be:

The number of moles of CO2 produced by CaCO3 is lesser, and that means it is the limiting reagent

Now, to get the mass of CO2 produced in theory, we multiply the number of moles by the molar mass of CO2

The molar mass of CO2 is 44 g/mol

Thus, we have the mass that was produced as: