12 A student carries out an experiment to find how fast 3 cm pieces of magnesium ribbon dissolve in 10 cm³ samples of sulfuric acid at different temperatures. Which piece of apparatus does the student not need? A balance B measuring cylinder с stop-clock D thermometer​

Answer:

2.688 L

Explanation:

Here we use the formula:

(P1 x V1)/T1  =  (P2 x V2)/T2

where;

P1 = 417 mm of Hg

P2 = 576 mm of Hg

V1 = 4.78 L

V2 = X L

T1 = 497 K

T2 = 386 K

substituting the values in the formula:

(417 x 4.78)/497 = (576 x X)/386

1993.26/497  = 576X/386

(4.01058 x 386)/576 = X

2.688 L = X

The  new volume of the cylinder when pressure increases to 576 mm Hg

and temperature decreases to 386 K is 2.688 liters.

Pressure is defined as the force applied on an object perpendicular to it's surface per unit area over which it is distributed.Gauge pressure is a pressure which is related with the ambient pressure.

There are various units by which pressure is expressed most of which are derived units which are obtained from unit of force divided by unit of area . The SI unit of pressure is pascal .

It is a scalar quantity which is related to the vector area element with a normal force acting on it.It is distributed over solid boundaries and across arbitary sections of fluid normal to the boundaries at every point.

Here we use the formula:

(P₁x V₁)/T₁ =  (P₂ x V₂)/T₂

where;P₁ = 417 mm of Hg,P₂ = 576 mm of Hg,V₁= 4.78 L,V₂= X L,T₁ = 497 K,T₂ = 386 K

substituting the values in the formula:

(417 x 4.78)/497 = (576 x X)/386

1993.26/497  = 576 X/386

(4.01058 x 386)/576 = X

2.688 L = X

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d. Fermium is the element only made in the laboratory based on periodic table.

Since they cannot exist in nature like the majority of elements, some elements must be created in a laboratory. To make these elements decay or combine two distinct nuclei, specialized equipment and circumstances are sometimes needed. Up to about Atomic Number 83, the majority of elements are present in nature.

Since technetium was the first element created by humans, its name is derived from the Greek for artificial. However, despite its name, technetium is actually present in nature, albeit in extremely small amounts.

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question unless otherwise instructed, you may use the periodic table in the chemistry: problems and solutions book for this question. which element is only made in the laboratory?

a)neodymium

b)thorium

c) cerium

d)fermium

The increased energy density of solid nitrogen is due to its strong covalent bonds. Methanol molecules have only weaker hydrogen bonds, so they are less tightly packed and have less energy density.

A covalent bond is a type of chemical bond that occurs when two atoms share a pair of electrons. This type of bond is the strongest type of bond and is typically found between non-metal elements. In a covalent bond, the atoms involved form a strong attraction for each other, due to the electrostatic forces of the shared electrons. This attraction helps keep the bonded atoms together, forming molecules or compounds.

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The mass of KF in the mixture is 1.067 grams

As per the details provided in the question are as follow,

Total weight of mixture (LiF+KF)= 5.08 grams

Mixture contains 3.26 grams of fluorine

Molar mass K = 39.10 g/mol

Molar mass F = 19.00 g/mol

Molar mass KF = 58.10 g/mol

Molar mass of lithium = 6.94 g/mol

mass of KF and LiF

Mass KF = X grams

Mass LiF = 5.08 -X grams

Now Calculate the moles

Moles KF = x grams / 58.10 g/mol

Moles LiF = (5.08-X grams) / 25.94 g/mol

1 mol of KF contains 1 mol of F atoms.

1 mol of LiF contains 1 mol of F atoms.

moles of F in KF= moles of KF= x/58.10 g/mol

moles of F in LiF = moles of LiF=  (5.08-x)/25.94g/mol

Total moles of Fluorine =(x/58.10)+((5.08-x)/25.94)

Calculate mass

The total weight of Fluorine in sample

3.26 grams =((x/58.10)+((5.08-x)/25.94))*19g/mol

x = 1.067 grams

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In a gel electrophoresis experiment run at pH 5, peptides will move towards the negative terminal of the gel if they contain negatively charged amino acids. In this case, peptide B contains two negatively charged amino acids (Asp and Glu) and therefore will move towards the negative terminal.

Electrophoresis is a laboratory technique used to separate molecules based on size and charge. It uses an electric field to move charged molecules through a porous matrix, such as a gel or membrane. The molecules migrate in the direction of the electric field, with the larger molecules moving more slowly than the smaller ones.

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The 4d and 4f subshells are not shown in this figure, so they are the missing subshells.

In atomic theory and quantum mechanics, an atomic orbital is a function that explains the position and wave-like behavior of an electron in an atom. This function can be used to determine the probability that an electron will be located in any area surrounding the nucleus of any atom. A three-dimensional representation of an electron's most likely position within an atom is called an orbital. The probability of discovering an electron close to a hydrogen atom's nucleus is shown in the diagram below. The 1s orbital has the highest probability, it is important to note. Orbitals are a mathematical function used in physics and chemistry to represent the wave nature of an electron or a pair of electrons in an atom.

Here,

The 4d and 4f subshells are missing because they are not shown in the figure.

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The balanced net ionic equation for the reaction of magnesium with hydrochloric acid is Mg(s) + 2HCl(aq) → MgCl2(aq) + H2(g).

In this equation, magnesium (Mg) is a solid which is reacting with hydrochloric acid (HCl) to form magnesium chloride (MgCl2) and hydrogen gas (H2). The stoichiometry of the equation shows that one mole of magnesium reacts with two moles of hydrochloric acid to form one mole of magnesium chloride and one mole of hydrogen gas. The net ionic equation is the chemical equation that shows only the participating ions and the balanced equation, the spectator ions are omitted. In this case, the H+ and Cl- ions are spectator ions, which are not involved in the reaction, so they are not shown in the net ionic equation.

Before using magnesium, anyone with mellitus, intestinal disease, heart disease, or renal disease should consult their doctor. Overdose. Anxiety, diarrhea, lower blood pressure, muscle pain, and exhaustion are symptoms of a magnesium overdose. Magnesium can be lethal in extremely high concentrations.

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The redox reaction CuCl2 + Zn ZnCl2 + Cu can be divided into two halves: oxidation and reduction.

The oxidation half-reaction occurs when copper (Cu) loses electrons and transforms into copper (II) ions, Cu2+.In this case, the oxidation half-reaction is:

Cu Cu2+ + 2e-

Copper (Cu) is oxidised to copper (II) ions (Cu2+) and loses two electrons (2e-) in this half-reaction.

The reduction half-reaction is the one in which zinc (Zn) gains electrons and becomes zinc ions (Zn2+. In this case, the reduction half-reaction is:

Zn + 2e- Zn2+

In this half-reaction, zinc (Zn) is reduced to zinc ions (Zn2+) and gains two electrons (2e).

When these half-reactions are combined, they form the overall redox reaction:

Cu Cu2+ + 2e- + Zn + Zn2+ + 2e- Zn2+

CuCl2 + Zn = CuCl2 + ZnCl2

The key to identifying the oxidation and reduction half-reactions is to identify which species is gaining or losing electrons. In this case, copper is losing electrons and zinc is gaining electrons.

It's also worth noting that chlorine is not involved in the oxidation and reduction processes; it is called a spectator ion, and it is there to balance the charge in the equation.

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Reaction rate: According to the question The order of a is 1 and the order of b is 2.

Reaction rate is the speed at which a chemical reaction occurs. It is closely related to the reactants, products, and the conditions of the reaction, such as temperature, pressure, concentration, and catalysts.

This can be determined by looking at the reaction rate. When the concentration of a is doubled, the reaction rate stays constant. This indicates that the reaction is not dependent on the concentration of a, and therefore its order is 1. When the concentration of b is doubled, the reaction rate doubles. This shows that the reaction is dependent on the concentration of b, and therefore its order is 2.

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Two advantages and two disadvantages of building a 3D model with modeling clay are that the advantages are flexibility and physicality, while the disadvantages are durability and precision.

Modeling clay has numerous benefits and drawbacks, some of the benefits include the ability to visualize and demonstrate the model, as well as the flexibility to change the structure. The disadvantages include the clay's short lifespan and ability to break, as well as the inability to achieve minute details.

Hence, two advantages and two disadvantages of building a 3D model with modeling clay are that the advantages are flexibility and physicality, while the disadvantages are durability and precision.

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pH will be needed to produce the given value of Q is 9.28.

Pressure is the force applied which is perpendicular to the surface of an object per unit area which that force is distributed. Pascal will be the SI unit of pressure. P = F / A

P is the pressure whereas, A is the area of the surface as well as F is the magnitude of the normal force.

The following reaction will be follows:

2H₂O + Br₂ + SO₂ -> 2Br- + SO₄²⁻ + 4H⁺

This expression represents the relation between given reaction and Q will be as follows:

Q = [Br-]² [SO₄²⁻] [H⁺]4 / [Br₂] Pso₄

1.4 ₓ 10-26 = (11.85)2 ₓ (8.350) ₓ [H⁺]4 / (2.5 ₓ 104) ₓ 2.50 ₓ 105

[H⁺]4 = 7.46 ₓ 10⁻³⁴

[H⁺] = 5.22 ₓ 10⁻¹⁰

Relation between pH and [H⁺] is as follows:

ph = -log[H⁺]

= - log 5.22 ₓ 10-10

= -(0.717 - 10)

= 9.28

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The index is the number of atoms of the element in that molecule. The coefficient tells you how many of that numerator there are.

The index is part of the formula and should not be changed once the reactant and product formulas have been determined. The coefficients indicate the number of each substance involved in the reaction and can be changed to balance the equation.

Coefficients are used to balance the equations. They are the numbers before the compounds or elements.

A subscript follows the element symbol and indicates the number of that element. The "2" in H2O means there are two H atoms. If there is no subscript after the element symbol, it is assumed to be "1".

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A substituted phenol compound that has both ortho and meta substitution is 2-nitrophenol.

Phenol (also known as carbolic acid) is a C6H5OH aromatic organic compound. It's a volatile white crystalline solid. A phenyl group (C6H5) is bonded to the a hydroxy group (OH) in the molecule. It is mildly acidic and must be handled with caution since it may cause chemical burns.

Phenol was originally extracted from coal tar but is now produced on either a large scale (approximately 7 billion kg/year) from oil feedstocks. As a forerunner to too many materials but instead useful compounds, it is a valuable industrial commodity.

The nitro group (-NO2) is an activating and ortho/para-directing substituent, which will direct the electrophile to the ortho and para positions. The nitro group is also a meta-directing substituent, which will direct the electrophile to the meta position.

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One or more chemicals can convert into one or more new substances through a chemical reaction. Chemical equations are used to describe chemical reactions.

How do chemical equations come into being?

A chemical equation is made up of a list of reactants (the chemicals used to start the reaction) on the left, an arrow symbol, and a list of products (the substances created during the reaction) on the right.

What does utilized in a chemical equation mean?

Meaning. + used to distinguish one product or reactant from another. employed to separate the reactants from the products; when the equation is read, it is pronounced "yields" or "produces."

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equation that determines rate is the last one. Quantum K-3 divided by concentration gives the reaction rate.

Calculating Kc: Kc's equation is Kc=[C]c[D]d[A]a[B]b. Assuming [C] , [D] are the molar quantities of something like the byproducts at equilibrium and [At] and [B] are really the molar concentration of a reactants at equilibrium, we may write K c = [C] c [D] d [A] a [B] b.

The proportionality constant (k) that links the pace of the action to the concentration of reaction mixture is known as the specific rate constant. For any chemical reaction, the rate law and the particular rate constant must be ascertained through experimentation. Temperature affects the rate constant's value.

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The orbital configuration for the Au+ ion is [Xe] 4f^14 5d^10.

An orbital diagram is a visual representation of the electrons in an atom or ion, showing their relative energy levels and the number of electrons in each level. It is usually represented by boxes or circles, with arrows pointing up or down to indicate the spin of the electron.

The orbital diagram for the Au atom would be represented as [Xe] 4f^14 5d^10 6s^1. Where Xe represents the inner electron configuration of the previous noble gas, and the numbers in superscript denote the number of electrons in a particular shell.

The Au+ ion has lost one electron from the outermost 6s orbital. Thus, its orbital configuration will become: [Xe] 4f^14 5d^10. The electron configuration follows the Aufbau principle and Hund's rule which states that electrons occupy the lowest energy level available first and have the same spin respectively.

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To calculate the root mean square velocity and kinetic energy of F2, Cl2, and Br2 at 298K, we need to use the kinetic theory of gases.

The root mean square velocity of a gas can be calculated using the formula:

v_rms = √(3kT/m)

where k is the Boltzmann constant, T is the temperature in Kelvin, and m is the molar mass of the gas.

The kinetic energy of a gas can be calculated using the formula:

E_k = (1/2)mv_rms^2

At 298K, the root mean square velocity and kinetic energy of F2, Cl2, and Br2 can be calculated as follows:

F2:

molar mass = 2 * 18.998 g/mol = 37.996 g/mol

v_rms = √(3 * 8.314 J/mol*K * 298K / 37.996 g/mol) = √(0.0244) m/s

E_k = (1/2) * 37.996 g/mol * (0.0244 m/s)^2 = 0.0167 J/mol

Cl2:

molar mass = 2 * 35.453 g/mol = 70.906 g/mol

v_rms = √(3 * 8.314 J/mol*K * 298K / 70.906 g/mol) = √(0.0132) m/s

E_k = (1/2) * 70.906 g/mol * (0.0132 m/s)^2 = 0.0051 J/mol

Br2:

molar mass = 2 * 78.918 g/mol = 157.836 g/mol

v_rms = √(3 * 8.314 J/mol*K * 298K / 157.836 g/mol) = √(0.0064) m/s

E_k = (1/2) * 157.836 g/mol * (0.0064 m/s)^2 = 0.0016 J/mol

To rank the halogens with respect to their rate of effusion, we need to consider the root mean square velocity of each gas. The rate of effusion of a gas is directly proportional to the root mean square velocity of the gas, which is the velocity of the gas particles. Therefore, the gas with the higher root mean square velocity will effuse faster than the gas with the lower root mean square velocity.

From the above calculation, we can see that the root mean square velocity of F2 is the highest, followed by Cl2, and then Br2. Therefore, the halogens can be ranked in terms of their rate of effusion as follows:

F2

Cl2

Br2

So Fluorine(F2) will effuse faster than Chlorine(Cl2) and Bromine(Br2)

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This could be a problem if you are trying to separate the two layers in a separatory funnel. Since diethyl ether and water are immiscible, they will form two separate layers with the ether layer on top and the water layer on the bottom.

Diethyl ether is a clear, colourless, extremely flammable liquid with such a low boiling point as well as a distinctive odour. It is also known as ether & ethoxyethane. It belongs to the large group of compounds known as ethers, which are molecules composed of two hydrocarbon chains linked by an oxygen atom.

However, the presence of water in the ether layer will disrupt this separation, as the two layers may not be easily distinguished. This could lead to incorrect results in experiments that require the separation of the two layers.

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When giving an alkene the E or Z label, the following substitutes are listed in order of importance:

NH₂

Br

CH₃

CH₂CH₂Cl

A chemical compound is a substance that contains atoms from multiple chemical elements held together by chemical bonds. It is made up of numerous identical molecules. Therefore, a molecule made up of only one type of atom is not a compound. a substance created by joining two or more different elements chemically in science. Examples of compounds are table salt (NaCl), which is made from the elements sodium and chloride, and water (H2O), which is created from the elements hydrogen and oxygen. A substance made up of two or more components is called a compound. Table salt, water, and carbon dioxide are a few examples of compounds.

Here,

Substituents in order of their priority when assigning the E or Z label to an alkene:

NH₂

Br

CH₃

CH₂CH₂Cl

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Since the fluorine atom has a higher electronegativity than carbon (4.0 vs. 2.5), the carbon-fluorine bond has a significant polarity/dipole moment.

Chemical bonds maintain the interconnectedness of molecules' atoms. Electrostatic forces between negatively charged electrons and positively charged atomic nuclei produce bonds (the positions of which in space are determined by quantum mechanics). Molecules and crystals are created by the formation of chemical bonds, which are long-lasting attractions between atoms or ions. Covalent bonds and ionic bonds both involve the sharing of electrons, while ionic bonds are formed by electrostatic attraction between two ions that have opposing charges.

The most straightforward explanation is that atoms are trying to get into the most stable (lowest-energy) state they can. Many atoms become stable when they satisfy the octet rule or have their valence shell completely filled with electrons (by having eight valence electrons). Atoms swap or trade their valence electrons in order to create bonds. It is possible for the valence electrons, which make up an atom's outermost energy level, to interact chemically. All chemical bonds are built on valence electrons.

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Arrange the following bonds in order of INCREASING bond strength. (Note: SMALLEST BOND STRENGTH FIRST. LARGEST BOND STRENGTH LAST)

A. C-I

B. C-F

C. C-Br

D. C-I

E. Bond strengths are equal.

According to the cited statistic, 42.1 percent of US land is used for farming.

According to article 246 of something like the Constitution, state legislatures in India are responsible for managing agricultural land. Due to its presence on the State List, land rights and title are a state decision.

954 million acres of agriculture in the US.

the 3.537 million sq miles of US territory.

40 acres make up 1 square mile.

3.537 million sq miles of land, multiplied by 640 acres per square mile.

2263,68,000,000 acres.

Farmland percentage is equal to 954/2263.68*100.

Farmland as a percentage is 42.1%.

Farmland percentage equals 0.042% if there are 3.537 million sq miles of land.

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Acid with a mass composition of 49.32% carbon, 43.84% oxygen, and 6.85% hydrogen has the empirical formula C3O2H5.

The simplest whole number ratio of atoms in a compound is the empirical formula of a chemical compound in chemistry. Sulfur monoxide's empirical formula, SO, and disulfur dioxide's empirical formula, S2O2, are two straightforward examples of this idea.

Here,

C= 49.32 g x (1 mol / 12.011) = 4.11 mol C

O= 43.84 g x (1 mol / 16.00) = 2.74 mol O

H= 6.85 g x (1 mol / 1.008) = 6.80 mol H

4.11 mol C / 2.74 = 1.5

2.74 mol O / 2.74 = 1

6.80 mol H / 2.74 = 2.5

you need a whole number so you find the least common multiple to make each one a whole number.

1.5 x 2 = 3 C

1 x 2 = 2 O

2.5 x 2 = 5 H

EF: C3O2H5

The empirical formula of acid that contains 49.32% C, 43.84% O, and 6.85% H by mass is C3O2H5.

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Ranking from highest to lowest boiling point are as Highest BP: C36H78, 2nd highest: C17H36, 3rd highest: C5H12, Lowest BP: C2H6, 2nd lowest: C5H12.

Here is the series, heptadecane, C17 H36 > paraffin, C36H74 > 2,2-dimethylpropane; C,H12 > ethane, C2H6 > pentane, C5H12

The boiling point of a substance is the temperature at which its vapor pressure is equal to the pressure surrounding it, causing it to change from a liquid to a gas. Different substances have different boiling points, which can be affected by factors such as pressure and impurities. The boiling point of water, for example, is 100 degrees Celsius (212 degrees Fahrenheit) at sea level, while other substances such as helium and hydrogen have much lower boiling points.

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2.7 ⋅(10)21. Avogadro's number is equal to 0.004412 moles H 2 O, which is equal to 6.022 x 10 23.

You should utilize the ideal gas law equation here as a starting point.

PV =nRT

Here

The gas's pressure is P.

Its volume, V, is what it takes up.

The amount of gas in the sample, n, is expressed as moles.

Its value is 0.0821 atm, and R is the universal gas constant. Determine the amount of moles of ammonia present in your sample by multiplying L mol K T by the absolute temperature of the gas.

Solve for n by rearranging the ideal gas law equation.

PV= nRT ⇒ n = PV/RT

You must convert the sample's volume to liters and the temperature to Fahrenheit before you can plug in your numbers to discover the answer.

n = 1 atm . 72.0⋅ 10 ³− L / 0.0821 atm . L /mol ⋅ K ⋅ (273.15 +25)K

NH 3 moles, n = 0.0029414

Now that you've seen the chemical equation in equilibrium, you know.

4 NH 3 ( g ) + 5 O 2 ( g ) → 4 NO ( g ) + 6 H 2 O ( l )

that the reaction produces 6 moles of water for every 4 moles of ammonia that participate in it.

Therefore, you don't need to worry about oxygen being a limiting reagent as it is supposed to be in abundance and your reaction will produce it.

The equilibrium chemical equation results in 0.0029414 moles of NH 3.

6 moles of H2O, 4 moles of NH3,

0.004412 moles of hydrogen oxide

Avogadro's constant, which states that 6.022 10 23 water molecules are required to generate one mole of water exactly, can be used to calculate the amount of water molecules that the reaction produces.

As a result, you can state that your sample will have

Avogadro's number is equal to 0.004412 moles H 2 O, which is equal to 6.022 x 10 23.

substances H 2 O

1 mole H 2O

= 2.7 ⋅ 10 21. molecules H2O

You only have one significant figure for the pressure at which the reaction occurs, so I'll round the answer to two sig figs.

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Answer: "The crew rocketed into orbit on December 21, and after circling the moon 10 times on Christmas Eve, it was time to come home."

Answer:

Ten times

Explanation:

Apollo 8 (December 21–27, 1968) was the first crewed spacecraft to leave low Earth orbit and the first human spaceflight to reach the Moon. The crew orbited the Moon ten times without landing, and then departed safely back to Earth.

Answer:

Opacity

Explanation:

Opacity is where path of light is totally blocked. The cap will totally block the light in its path. Whereas, if you flash a light on the plastic (which will be transparent cuz light goes straight thru to other side, and if you flash light on liquid, it will scatter a little but still make to other side (translucent)

If 0.05570 mol weighs 15.86 g, the molar mass of diazepam (valium®) is 284.74 grams.

The ratio between the mass and the amount of substance in any sample of a chemical compound is known as the molar mass in chemistry. The molar mass of a substance is a bulk property rather than a molecular one. The mass of 1 mole of a compound and the number of grams per mole are determined by the compound's molar mass. In other words, the molar mass is the sum of the masses of all the atoms that make up a mole of a specific molecule, expressed in grams. As a result, molar mass is measured in grams/mole.

Here,

given,

given mass=15.86 g

moles of diazepam=0.0557

molar mass m,

0.0557=15.86/m

m=15.86/0.0557

m=284.74 grams

The molar mass of diazepam (valium®) if 0.05570 mol weighs 15.86 g is 284.74 grams.

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The atomic mass of an element of a sodium isotope (Na) is 22. There are 11 neutrons in it.

The neutron is neutrality, as you could have inferred from its name. It is neither drawn to nor drawn away from other objects because it carries no charge at all. With one exemption, every atom contains neutrons, which are fused with protons and some other neutrons to form the atomic nucleus.

In comparison to positive ions, neutrons are slightly heavier and have an electric charge that is neither positive or negative. Neutrons that have left a nucleus are considered to be "free" neutrons. Both nuclear fusion and implosion processes result in the production of these free neutrons.

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a) C would be liquid at 5° C

b) B has the weakest intermolecular interaction

c) D has the smallest distance between its particles at 500°C

d) At -50°C, the particles of B would be moving about in the liquid state.

We know that the melting point is the temperature at which the liquid can be obtained from the solid. In this case we have both the malting point and the boiling point which is the temperature at which the liquid can be converted to gas.

It should be recalled that the melting point and the boiling point of the liquid would give us the liquid range of the substance and gives an idea of the intermolecular forces in the compound.

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The saturation pressure of every gas in the entire volume, if somehow the gases being allowed to mix, is 2.5 atm.

In comparison to other forms of matter, like solids and liquids, vapors have a lower density. Particles have a great deal of kinetic energy yet aren't very attracted to one another, thus there is a lot of unoccupied space between them. A sampling of matter that assumes the shape of the bottle it is stored in and develops a consistent density on the inside of the container is referred to as a gas.

Pressure = 2.10 atm

Temperature = T K

Volume = 712 mL

= 0.712 L (1 mL = 0.001 L)

PV=nRT,

2.10 atm × 0.712 L = n × 0.0821 L.atm/K.mol × T K

n = 19.2232 / T moles

For Container B :

Pressure = 4.80 atm

Temperature = T

Volume = 134 mL

= 0.134 L (1 mL = 0.001 L)

= 4.80 atm × 0.134 L = n × 0.0821 L.atm/K.mol × 298 K

= n = 6.3435 / T moles

Total moles = 19.2132 / T moles + 6.3435 / T moles

= 25.5567 /T moles

Total Volume = 712 + 134 mL = 846 mL = 0.846 L

P × 0.846 L = 25.5567 /T × 0.0821 L.atm/K.mol × T

Total P = 2.5 atm

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