the rate of effusion of substance a is three times the rate of effusion of substance b. if the molar mass of substance a is 4.00 g/mol, what is the molar mass of substance b?

The mass of 2.9 mol of the given compound is 4854.89 g.

A mole can be specified as a standard unit that is used to determine a given count of particles. A mole can be used to evaluate a huge number of quantities of atoms, or molecules.

Given, the atomic mass of the X = 189.5

The atomic mass of Y = 197.6

The atomic mass of Z = 115.7

The molecular formula of the compound is X₁Y₄Z₆.

The mass of one mole or molar mass = 189.5 + 4 (197.6) + 6(115.7) = 1674

Given, the number of moles of X₁Y₄Z₆ = 2.9 mol

The mass of 2.9 moles of X₁Y₄Z₆ = 2.9 × 1674 = 4854.89 g

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Neil Bohr used the fluorescent screen and an alpha particle detector to study the structure of an atom.

An atom is defined as the smallest unit of matter which forms an element. Every form of matter whether solid,liquid , gas consists of atoms . Each atom has a nucleus which is composed of protons and neutrons and shells in which the electrons revolve.

Atoms of the same element are similar as they have number of sub- atomic particles which on combination do not alter the chemical properties of the substances.

The atom as a whole is neutral and stable due to presence of oppositely charged particles.

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Answer:due to unequal heating

Explanation:

Melting and freezing refer to the changes in state which occur when the solid and liquid states interchange. Melting occurs when a solid is heated and turns to a liquid and freezing occurs when a liquid is cooled and turns to a solid.

Answer:

Melting and freezing both require energy, however melting involves the speeding up of molecules, and freezing involves slowing them down

Explanation:

The crash where the cone experience a stronger force is option D because: Crash 1: the force on the black hockey puck was stronger in this crash, so the force on the cone was also stronger.

The ball is drawn back to Earth by gravitational force. The ball returns to Earth as a result of friction. The ball is forced back toward Earth by magnetic force.

A puck's velocity changes when a player makes contact with it when it is still. He causes the puck to speed up, in other terms. The hockey stick's force, which causes the acceleration, is responsible. The velocity grows as long as this force is in motion.

Therefore, the force applied to an object must be larger than what is required for a progressive slowing down if the object must be slowed down quickly. For instance, a bicycle's brakes will slow or stop it more quickly the more force is given to it.

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See full question below

After hockey practice, Carissa and Keenan were playing a game where they were pushing some objects to get them to crash. They were using a cone and two different pucks—a black one with more mass for Crash 1 and a blue one with less mass for Crash 2. They want to know what happened to the cone.

Use the information from the diagram to answer.

In which crash did the cone experience a stronger force? How do you know?

answer choices

There was no force on the cone. In both crashes, only the hockey puck experienced a force.

The diagram doesn’t tell you anything about the force on the cone. It only gives information about the force on the pucks.

It was the same force in both crashes; the hockey puck changed speed by the same amount in each crash, so the force on the cone was the same each time.

Crash 1; the force on the black hockey puck was stronger in this crash, so the force on the cone was also stronger.

The Rf of diphenylmethanol (product) is smaller than that of the benzophenone(reactant) .

What is benzophenone used in?

In addition to being a flavoring agent, fragrance enhancer, perfume fixative, and additive for plastics, coatings, and adhesive formulations, benzophenone is also utilized as a UV curing agent. In order to protect cosmetics from harm from ultraviolet light, benzophenone is also used as a screen.

What are the side effects of benzophenone?

Both photocontact dermatitis and the raditional allergic contact dermatitis are caused by benzophenone sensitivity. Products containing benzophenone or benzophenone derivatives may produce redness, swelling, itching, and fluid-filled blisters in people who are allergic to benzophenone.

What is Diphenylmethanol used in?

Diphenylmethanol (DPM) and its derivatives are crucial components in the production of cosmetics, drugs, and practical organic compounds.

How do you make Diphenylmethanol?

A Grignard reaction involving phenylmagnesium bromide and benzaldehyde can produce diphenylmethanol. The reduction of benzophenone using sodium borohydride, zinc dust, or sodium amalgam and water is an alternate approach.

As, we know that,

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16 is the mass of this atom.

The Oxygen (O) has an atomic number of 8 and has a mass number of 16. Upon accepting 2 electrons it becomes O2-. The mass number is defined as the sum of the number of protons and neutrons present in the molecule. So here for O2- it contains 8 protons,8 neutrons and 10 electrons.

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The amount of water needed to be added to prepare the solution would be 0.94 liters.

When diluting solutions, the number of moles of solutes before dilution must be equal to the number of solutes after dilution. The only thing that changes are the volume and concentration.

Thus, the equation of dilution is:

[tex]m_1v_1[/tex] = [tex]m_2v_2[/tex]

Where

In this case:

[tex]m_1[/tex] = 5 M, [tex]m_2[/tex] = 0.3 M, and [tex]v_2[/tex] = 1000 mL

Substituting:

5[tex]v_1[/tex] = 0.3 x 1000

    [tex]v_1[/tex] = 300/5

        = 60 mL

This means that the volume of the stock solution to be taken is 60 mL. The amount of water to be added would then be:

1000 - 60 = 940 mL

940 mL = 0.94 L

In other words, the amount of water needed to be added to prepare 1000 mL of 0.3M NaCl from a 5 M NaCl stock solution is 0.94 L.

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If in 1 M acetic acid as the buffer solution to inhibit the pH change of an aqueous solution, if the strong acid is added to the buffer solution the pH decrease.

The buffer solution consist of both the acid and the base. the weak acid and the conjugate base or the weak base and the conjugate acid. if we added the strong acid then pH value of the solution will decreases, the expression is given as:

pH = pka + log [salt]/ [acid]

pH = 1 / [H⁺]

it is clear form the above equations that as the H⁺ ions concentration increases the pH value of the solution decreases. the pH value and the H⁺ ions concentration are inversely proportion to each other.

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Cations are  formed when neutral atoms lose electrons from the valence shell of an atom.

An atom is defined as the smallest unit of matter which forms an element. Every form of matter whether solid,liquid , gas consists of atoms . Each atom has a nucleus which is composed of protons and neutrons and shells in which the electrons revolve.

The protons are positively charged and neutrons are neutral and hence the nucleus is positively charged. The electrons which revolve around the nucleus are negatively charged and hence the atom as a whole is neutral and stable due to presence of oppositely charged particles.

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Answer:

Mg+HCl = MgCl+H2

Explanation:

you just have to write the correct formula of these elemernt

In order to precipitate the calcium ions as calcium oxalate, a 2.00g sample of limestone was first dissolved in hydrochloric acid until all of the calcium was transformed to Ca²⁺ (aq). This was followed by the addition of excess ammonium oxalate solution, (NH₄)₂C₂O₄(aq). Filtered, dried, and weighed to a consistent mass of 2.43g. The percentage by mass of calcium in the limestone sample is 31.25%

The percentage by mass of calcium in the limestone can be calculate as follows:

Mass of precipitate that is calcium oxalate = 2.43 g

Moles of calcium oxalate = 2.00g /128 g/mol = 0.015625 moles

One mole of calcium atoms make up one mole of calcium oxalate.

so, 0.015625 moles calcium oxalate equal to 0.015625 moles calcium atoms

Mass of  0.015625 moles of calcium :

0.015625 mol × 40 g/mol = 0.625 g

Mass of sample of limestone = 2 g

Percentage of calcium in limestone:

(0.625 g/2 g) x 100 = 31.25%

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The arrow that represents the change of state that has been described is L.

We know that there are three states of matter of matter and these are the solid, the liquid and the gas. We know that in the solid state, the particles that compose matter are all joined together and they are held in fixed positions and can not be able to slide past one another.

As such, we have been shown the diagram that shows the way that the energy is transferred between the states of matter in the image that is attached to this answer.

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Answer:

Its A

Explanation:

I got it right

an ideal gas is brought through an isothermal compression process. If 1842 J is released by the gas during this process, the temperature of the gas is 134.27 K

Isothermal compression is the thermodynamic method of decreasing volume or increasing pressure when the system temperature remains constant. Thermal equilibrium is maintained throughout the process.

When a gas is compressed isothermally, work is carried out on the system to reduce volume and increase pressure. Working on the gas increases its internal energy and tends to raise its temperature. To keep the temperature constant, energy must escape the system as heat and enter the environment.

According to the question, this is the case of isothermal reversible compression of gas.

As per the first law of thermodynamics,

where,

ΔU = internal energy

q = heat

w = work done

As we know, the term internal energy depends on the temperature and the process is isothermal which means at a constant temperature.

Thus, at a constant temperature, the internal energy is equal to zero.

q = -w

Thus, w = -q = 1842 J

The expression used for work done will be,

W = nRT ln(Vf/Vi)

where,

w = work done = - 1842 J

n = number of moles of gas  = 5 mole

R = gas constant = 8.314 J/mole K

T = temperature of gas  = ?

Vi = initial volume of gas

Vf = final volume of gas

Now put all the given values in the above formula, and we get the temperature of the gas.

- 1842J = 5 mole * 8.314J/mole K*T*ln (104.3 * 10−6 m3/224.2  * 10−6 m3)

T = 134.27

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Answer:

More mass means more force is needed to achieve the same change in speed in the same amount of time. That force is transmitted from the road, to the tires, to the wheels, through the brakes, to the frame and rider.

The weight on a bicycle affects the force required to accelerate it as it increases inertia it will slow down its rate of acceleration.

Acceleration is defined as the rate of change of velocity of an object with respect to time. These are vector quantities which have magnitude as well as direction.

The orientation of the acceleration of an object as given by the orientation of the net force acting on that object. It is expressed as:

[tex]\overline{a} = \frac{v - v_0}{t} = \frac{\Delta v}{\Delta t}\overline{a} = average acceleration\\v = final velocity\\v_0 = starting velocity\\t = elapsed time[/tex]

Acceleration is proportional to the force applied, so the greater the force, the greater the speed of the object in the direction of the force. Mass is inertia, which is the reluctance to accelerate, so for the same force, more massive objects experience smaller acceleration than less massive objects.

Thus, the weight on a bicycle affects the force required to accelerate it as it increases inertia it will slow down its rate of acceleration.

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The concentrations of all species present in a 0.29 m solution of ethylammonium chloride  is 0.00000223

pKa for C2H5NH3+ = 10.7

pKw = 14.0

pKa + pKb = pKw

10.7 + pKb = 14.0

pKb = 14.0 - 10.7

pKb = 3.30

C2H5NH3Cl is a salt of ethylamine and HCl so it will dissolve in water to produce  C2H5NH3^+ + Cl^-

The base hydrolysis reaction:  C2H5NH3^+(aq) + H2O(l) <=> C2H5NH2(aq) + H3O^+(aq)

This reaction is described by Kb.

Kb = [C2H5NH2][H3O^+]/[C2H5NH3^+]

Let [C2H5NH2] = [H3O^+] = x,

so [C2H5NH3^+] = 0.29 - x

Kb = x^2/(0.29 - x) = 2.00 x 10^-11  

Let's solve for x. In this equation,  It is possible to solve without the use quadratic equation. So we can assume that 0.29 - x  is approximately equal to 0.29.  We won't know until we do the calculation.

We get:  x^2 + 2.00 x 10^-11x - 4.99 x 10^-12 = 0

With the use of a quadratic calculator.

x = 2.23 x 10^-6 M = [C2H5NH2] = [H3O^+]

0.29- x  is just 0.26 M in this problem because 2.23 x 10^-6 M is insignificant.

[C2H5NH3^+] = 0.29 M = [Cl^-]

NOTE:

pH = -log [H3O^+] = -log(2.23 x 10^-6) = 5.65

Ka is the acid dissociation constant

Kb is the base dissociation constant

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The number of way to select people from a total of a people is a! /b!·(a-b)!

plugging in 15 for A and 6 for B

P= 15! / 6!(15-6)!

P= 1307674368000 / 720·9!

P= 1307674368000 / 362880

P= 360360

By choosing some items from a set and creating subsets, permutation and combination are two approaches to represent a group of objects. It outlines the numerous configurations for a particular set of data. Permutations are the selection of data or objects from a set, whereas combinations are the order in which they are represented. Both ideas are critical to mathematics.

Here, the differences between permutation and combination are described in detail. Here, we'll talk about both subjects with formulas, examples from everyday life, and questions that have been answered. Students can also work on the Permutation and Combination Worksheet to improve their understanding of this subject and learn shortcuts for answering additional questions.

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As an intermediate precautionary measure, I should isolate the leak area in all directions for 50 metres(150 feet).

These manuals advise a 150-foot initial isolation in all directions. Responders should always strive to position themselves uphill, upwind, and upstream of the incident when responding to a scene involving hazardous materials.

Small spills (less than 52.83 gallons, or 200 litres): 100 feet in all directions should be isolated first (30 m). then during the day, safeguard those who are downwind: 0.2 mi (0.2 km). then throughout the night, safeguard those who are downwind: 0.8 mi (1.2 km).

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The given statement about radii is false and the correct statement is only radii of cation are always smaller than radii of corresponding atoms of same elements.

Radii of anions are greater than its parent atoms due to the following reasons:  1. Size of anion is always greater than its parent atom because anions are formed due to gain of electrons. When electrons increases there are still same number of protons. The attractive force is thus reduced as there are same number of protons attraction increased number of electrons. This causes the electrons to not be bound as tightly to the nucleus resulting in an increase in size. 2. Size of cation is always smaller than its parent atom  because as a particular atom looses electron, no of proton become more than no of electron and attraction forces increases. So radius decreases.

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A solid with atoms a, b, and c arranged in a cubic lattice has the simplest formula possible: abc3.

Given that the unit cell's an atoms occupy two of its corners and one of its body centres, the b atoms occupy two corners, and the c atoms occupy four of its corners and two of its faces

There are eight corners, and each one has an atom in it.

Atomic number of a = 8 * 1/8 = 1

The centre b atom is the lone atom. So b = 1

Each of the six faces holds a c atom.

6 x 1/2 = 3 c atoms are present.

So when we combine them, we get the solid as abc3 formula.

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The velocity of Trevor, given that for 55.0 seconds, he moved 583 meters sountheast is 10.6 m/s

Velocity is simply defined as the rate of change of displacement with time. Mathemathically, it is given as:

Velocity = displacement / time

With the above formula, we can obtain the velocity of Trevor as illustrated below::

Velocity = displacement / time

Velocity = 583 meters / 55.0 seconds

Velocity = 10.6 m/s

Thus, from the calculation made above, we can conclude that the velocity of Trevor is 10.6 m/s

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Explanation:

Fermentation: When yeast is added to the dough, it begins to ferment the sugars present in the dough, producing carbon dioxide and ethanol. The carbon dioxide helps to leaven the dough, while the ethanol is mostly evaporated during baking.

Maillard reaction: During baking, the heat causes a reaction between the amino acids and sugars in the dough, producing a wide range of compounds that give bread its characteristic flavor and aroma. This reaction is known as the Maillard reaction.

Protein denaturation: The heat of baking causes the proteins in the dough to denature, or lose their native conformation. This helps to give bread its texture and structure, and also contributes to the development of its crust.

Sedimentary rock layers are referred to as rock strata.

A rock is a dense mass of mineral grains that have grown or been cemented together over time. There are big rocks and little rocks. Pebbles are little rocks.

The sediment grains that are deposited by water, wind, or ice become sedimentary rocks. They are always formed in layers and are referred to as "beds" or "strata," and frequently include fossils.

Weathering, erosion, deposition, compaction, and cementation are the processes that result in the formation of these horizontal layers. Newer layers are deposited and created during this process on top of older layers, allowing for the relative dating of each layer.

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The rate of effusion of substance A is 3 times the rate of effusion of substance B, and molar mass of A is 4g/mol, then molar mass of B is 36g/mol.

Graham Law:

The rate of effusion of a gaseous substance is inversely proportional to the square root of its molar mass. This is called Graham's Law

R = k/√M

where k is constant and m is molar mass of the substance.

rate of effusion of substance A is 3 times the rate of effusion of substance B.

molar mass of substance A is 4.00g/mol

Ra = 3Rb

Ra/Rb = √Mb/√Ma

3Rb/Rb = √Mb/√4

3 = √Mb/2

√Mb = 6

Mb = 36

so, molar mass of substance B is 36g/mol.

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The amount, in moles, of chlorine that would be present in 3 moles of [tex]MgCl_2[/tex] would be 6 moles.

[tex]MgCl_2[/tex] is made from magnesium and chlorine molecules according to the following equation:

[tex]MgCl_2 --- > Mg^{2+} + 2Cl^-[/tex]

From the above equation, 1 mole of [tex]MgCl_2[/tex] is made up of 1 mole of Mg and 2 moles of Cl.

Following this established ratio, the amount of chlorine that would be present in 3 moles of  [tex]MgCl_2[/tex] can be calculated as follows:

1 mole [tex]MgCl_2[/tex] = 2 moles of Cl

3 moles  [tex]MgCl_2[/tex] = 2 x 3/1

                           = 6 moles of Cl

In other words, 6 moles of Cl would be present in 3 moles of [tex]MgCl_2[/tex].

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The experimental set up in B is to observe the growth the green beans without the addition of fertilizer. Thus, we can compare the growth of the plant with and without fertilizer and thereby we can understand the effect the fertilizer on the plant growth.

Fertilizers are chemical substances used to nourish the plants by making the soil rich in nutrients and minerals. Plants needs minerals along with water such as potassium, calcium, phosphorous, nitrogen etc.

Sometimes the soil comes deficient of these minerals and we have to fertilize the soli by the addition of the chemicals containing these minerals. Hence, fertilizers provide a nutrient rich soil for plant growth.

The experimental set up with fertilizer added plant and the second one (B) without fertilizer helps to compare the growth in both conditions and we can clearly understand how fertilizers effect the growth of plants by comparing the plant growth in A and B.

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Answer: A balanced nuclear equation for the fusion of helium-4 to form carbon-12 would be:

He-4 + He-4 -> C-12 + energy

In this equation, two helium-4 atoms fuse to form a single carbon-12 atom and release energy. This process would occur in the core of the Sun once it has exhausted its supply of hydrogen and begins to fuse helium-4.

Magnesium and calcium are 2nd group elements with 2 valence electrons. They are metals in room temperature and easily lose these electrons to nonmetals such as oxygen.

Magnesium is 12th element in periodic table. It is 2nd group element and is a called alkaline earth metals. Its group members are calcium, strontium, and barium.

They contains 2 valence electrons which can be easily lost to a non-metal. Oxygen is highly electronegative element and it contains 6 valence electrons and need two more electrons to achieve octet.

Al is 13th group element it is not as much electropositive as alkaline earth metals. It contains 3 valence electrons and thus it need to lose all these 3 electrons to achieve octet. Hence, Al is less reactive towards O2 in comparison with Mg and Ca.

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Answer:

Magnesium sulfide

Explanation:

The value of the density of wood that is 0.5g/cm³ in SI units would be  500  [tex]kg/m^3[/tex].

The SI unit is an acronym for the international system of units. It is a system that guides measurements generally in science. It consists of 7 base units:

Thus, for a density that is in g/cm³, the SI unit should be kg/m3.

0.5 g/cm³ = 0.5g/1 cm³

1 g = 0.0001 kg

0.5 g = 0.5/1000 = 0.0005 kg

1 cm³ = 1 x [tex]10^{-6[/tex] [tex]m^3[/tex]

Thus, 0.5 g/cm³ = 0.0005 kg/1 x [tex]10^{-6[/tex] [tex]m^3[/tex]

                            = 500  kg/m^3.

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