in a solution that is 90% ethyl alcohol and 10% water, the solute is and the solvent is . g

If the total pressure is 1.19 atm than partial pressure of N2 is 0.99 atm and O2 is 0.19 atm.

An idea is the partial pressure of a gas (rather than something we can measure). We consider the pressure of each gas in a mixture to be a component of the combination's overall pressure. Each gas has a certain pressure when contained by itself.

Given,

A gaseous mixture which contains 84% of N₂ and

16% of O₂

The total partial pressure  Ptotal = 1.19atm

Ptotal =  P N₂ + P O₂

% of various component of the mixture, we know the fractional composition of each components:

Partial pressure of component = Fractional composition of component × Total pressure

Partial pressure of component = [tex]\frac{percentage composition}{100}[/tex] × Total pressure

Partial pressure of component of N2 =  84/100 × 1.19 = 0.99 atm

Partial pressure of component of O2 =  16/100 × 1.19 = 0.19 atm

Thus,

partial pressure of N2 is 0.99 atm and O2 is 0.19 atm.

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The solute can have infinite solubility in the solvent when the molecule-to-molecule attractions in the solute are comparable to those in the solvent. The correct option to this question is B

On the basis of the concept, solute has a lower tendency to dissolve in water the stronger the interactions between the solute particles. Likewise, there is a greater chance that solubility will rise the stronger the interactions between the molecules of the solute and the solvent.

Water molecules cluster together as a result of stronger water hydrogen bonds, making them unavailable for biomolecular hydration. If the hydrogen bonds between the proteins significantly strengthen or weaken, the extended denatured forms of the proteins typically become more soluble in water.

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Complete question:

What happens when the molecule-to-molecule attractions in the solute are comparable to those in the solvent?

A) The solute does not dissolve in the solvent.

B) The solute can have infinite solubility in the solvent.

C) The material has only limited solubility in the solvent.

D) The solution will become saturated.

Since there are four groups encircling the sulphur atom, the electron geometry is tetrahedral ( 2 lone pairs and 2 hydrogens). Due to the lone pair repulsion of the S-H bonds, the hydrogen sulfide's molecular geometry is bent, something I hadn't encountered in university. As a result, the angle will be much less than 109.5 degrees, or roughly 92 degrees.

The difference between molecular and electronic geometry is that the latter is the geometry of the localised electron densities, whilst the former simply considers the bound substituents around the sulphur, such as the hydrogens ( bonds and lone pairs).

Four of the five geometries linear, trigonal planar, tetrahedral, trigonal bipyramidal, and octahedral are referred to as electron group geometries. The form of the molecule is changed but the electron geometry remains the same if one or more of the bonding pairs of electrons are swapped out for a lone pair.

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By using the formula of a density, the mass of a gold that occupies the same volume as 62.9 g of cobalt is

The density of a substance is calculated using the formula

density=mass/volume

By using density and mass, find out the volume in cobalt and use the same volume to find mass of gold. Rearrange the formula of density for volume

volume=mass/density

Plug values of cobalt in the formula

volume = (62.9 g×ml/8.90 g)

volume = 7.0674 ml

Now rearrange the formula of density for mass to calculate the mass of a gold

mass=density×volume

Plug values of gold in the formula

mass = 7.0674 ml×(19.3 g/ml)

mass = 136.40 g≈136 g

Therefore, the mass of gold occupies the same volume is 136 g.

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The estimated effective nuclear charge, Zeff, experienced by an electron in a 3p orbital of a chlorine atom is 6.1.

The effective nuclear charge is the charge experienced by the outermost valence electrons of an atom.  the effective nuclear charge is given as :

Zeff = Z - s

where,

Z is the actual nuclear charge

s is the screening costant

The electronic configuration for the chlorine atom is :

₁₇Cl = (1s²) (2s² 2p⁶) (3s² 3p⁵)

The formula for calculating screening constant of 3p electron is :

s = ( 0.35 ( number of electrons in n )  + 0.85 ( electron in (n-1 ) ) + 1 ( electrons in ( n-2 )

s = 0.35 (6) + 0.85 ( 8 ) + 1 ( 2 )

s = 10.9

Zeff = Z - s

Zeff = 17 - 10.9

Zeff = 6.1

Thus, The estimated effective nuclear charge, Zeff, experienced by an electron in a 3p orbital of a chlorine atom is 6.1.

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Answer:

6

Explanation:

Magnesium=24

helium= 4

24:4=6

The 4s orbital in the electronic configuration of a germanium should be filled first before 3d orbital because 4s orbital has a less energy than 3d orbital.

The electronic configuration of element is written in the order which is given in the attached image. The order of filling electron is given by Madelung rule in which electrons tries to achieve the order which fills the energy sublevels of atoms. According to the Aufbau principle, electrons occupy the lowest energy sublevel.

In other words, the orbital with a smaller value of n+l will be filled first. The n and l value for 4s orbital is 4 and 0 respectively. The n and l value for 3d orbital is 3 and 2. Hence, their n+l value will be

4s=(4+0)=4

3d=(3+2)=5

Hence, the electronic configuration of germanium should be written as 1s²2s²2p⁶3s²3p⁶4s²3d¹⁰.

Therefore, 4s orbital in the electronic configuration of a germanium should be filled first before 3d orbital because 4s orbital has a less energy than 3d orbital.

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The term is called Thermal Decomposition. Calcium Carbonate is strongly heated until it undergoes thermal decomposition to form calcium oxide and carbon dioxide. The calcium oxide (unslaked lime) is dissolved in water to form calcium). Bubbling carbon dioxide through these forms a milky suspension of calcium carbonate.

Thermal decomposition is a chemical reaction where heat is a reactant. Since heat is a reactant, theses reactions are endothermic meaning that the reaction requires thermal energy to break the chemical bonds in the molecule.

A common example of thermal decomposition reaction is calcium carbonate decomposes into calcium oxide and carbon dioxide. This process is employed in the manufacturing of quick lime, which is an important substance in many industries.

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Answer: 0.172

Explanation:

Answer:

the answer is D

Explanation: i took the test and it was correct

The slope of the graphical method can be used to obtain the activation energy.

As we know that rate constant (K) and the activation energy (Ea) relate to each other as;

   lnK = ln A - Ea / RT

By using the values from the slope between 1/T and K, the activation energy of any reaction can be calculated

Hence

   Slope = -Ea / R

Ea is the activation energy, the minus sign indicates that energy will b absorbed by the system

R is the rate constant, and the value of R is 8.314 J/mol.K

So it is clear that we can get the activation energy by using the slope of the graphical data.

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Taking into account the definition of sensible heat, the final temperature if 150.0g of chloroform absorbs 1.0 kilojoules of heat is 31.94 C.

When heat added or removed from a substance causes a temperature change in it without affecting its physical state (phase change), it is called sensible heat.

The expression that allows to calculate heat exchanges is:

Q = c× m× ΔT

where:

In this case, you know:

Replacing in the definition of sensible heat:

1000 J = 0.96 J/gC× 150 g× (Tfinal - 25 C)

Solving:

1000 J = 144 J/C× (Tfinal - 25 C)

1000 J÷ 144 J/C= Tfinal - 25 C

6.94 C= Tfinal - 25 C

6.94 C + 25 C= Tfinal

31.94 C= Tfinal

Finally, the final temperature is 31.94 C.

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Combination of ionic charge and ionic radius give the largest lattice enthalpy for an ionic compound are:

 Ionic charge = high, Ionic Radius = small

Understanding Ionic bonds Ionic bonds occur due to the handover of electrons to form positive ions and negative ions whose electron configuration is the same as that of the noble gases.  Positive ions and negative ions are bound by an electrostatic force.  The resulting compounds are called ionic compounds.  One example that we often encounter everyday is table salt.

Well, the chemical formula for table salt is NaCl (Sodium chloride).  In solid NaCl there is a bond between Na⁺ ions and Cl⁻ ions by electrostatic forces, so it is called an ionic bond.  The crystal form of NaCl is a series of Na⁺ ions and Cl⁻ ions.  One Na⁺ ion is surrounded by six Cl⁻ ions and one Cl⁻ ion is surrounded by six Na⁺ ions .

Each element must try to have an electron configuration like that of a noble gas, either by releasing electrons or accepting electrons, so that it is stable.  This electron handover event occurs in the NaCl compound/ table salt.

Na belongs to group IA where IA has 1 valence electron, so that to be stable IA must release 1 electron.  If you look at the electron configuration, 11Na: 2, 8, 1. So when removing 1 electron, the last electron becomes 8 (according to the octet rule).  Due to removing 1 electron, the originally neutral Na becomes charged +1 (Na⁺).

 The reaction:

Na → Na⁺ + e⁻   (meaning Na loses 1 electron, see the electron is to the left of the arrow)

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Suspension will settle out if allowed to sit on a table

In suspension the solute does not dissolve in liquid and when placed on table for sometime and it will settle down at the bottom of the beaker and we can separate particles of solute easily from solvent through filtration and the colloid particles of solute does not dissolve in liquid neither it is settle down and it float through the solvent and in solution the particles of solute dissolve in to the solvent and we cannot identify them as separate we cannot separate them by filtration and in compound the two element combine to form a new thing and resultant compound have two new or different properties other than its ingredients so the correct answer is suspension

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After a double displacement reaction, the balanced equation and products are [tex]AgNO_{3}[/tex] (aq) + NaCl(aq) >>> AgCl(s)+ [tex]NaNO_{3}[/tex](aq).

In the equation of [tex]AgNO_{3}[/tex] with NaCl silver displaces the sodium from Nacl and forms AgCl while Na reacts with [tex]NO_{3}[/tex] and forms [tex]NaNO_{3}[/tex]. This is an example of double displacement and precipitation reaction.

In an aqueous solution, a double-displacement reaction takes place when the positive and negative ions of two ionic compounds exchange positions to create two completely different compounds. These substances may manifest as precipitates, gases, or molecular substances.

The following equation describes the general form of a double-displacement reaction: AD + BC = AB + CD

There are two types of double displacement reaction: precipitation and neutralization.

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The balanced neutralization reaction that occurs between H2SO4 and KOH in aqueous solution is;

H2SO4 (aq) + 2KOH (aq) --> 2H2O (l) + K2SO4 (aq)

Neutralization reaction

We refer to this kind of reaction, in which an acid and a base combine to produce water and salt, as a neutralization reaction. In this instance, our base is potassium hydroxide (KOH), and our acid is sulfuric acid (H2SO4) (KOH).

Acid and base leads to water and salt.

Double-replacement reaction

The H+ from the H2SO4 will attach to the OH- from the KOH in this double replacement reaction, resulting in the formation of H2O. (water). Similar to this, K+ will bind to SO42- to form K2SO4 salt.

For example, sodium hydroxide (NaOH) and hydrochloric acid (HCl) can be combined to create a salt, sodium chloride (NaCl), and water (H2O). NaOH + HCl → NaCl + H2O is the chemical formula for the neutralization reaction.

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Specifically we can use red and blue litmus paper, phenolphthalein, and bromothymol blue , to determine the ph of an opaque (non-clear, cloudy) substance?

What is pH ?

pH, a quantitative measure of the acidity or basicity of aqueous or other liquid solutions. Widely used in chemistry, biology, and agriculture, this term translates the concentration value of hydrogen ions (usually in the range of about 1 to 10-14 gram-equivalents per liter) into a number between 0 and 14. increase. At neutral (neither acidic nor alkaline), the concentration of hydrogen ions is 10−7 gram equivalents per liter, which corresponds to a pH of 7. Solutions below pH 7 are considered acidic. Solutions with a pH greater than 7 are considered basic or alkaline.

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A person weighing around 62 kg can jump from a height of 0.329 metres without breaking their legs.

Potential energy present in a jumper from height h. = m g h  

which, when the individual strikes the ground, entirely transforms into kinetic energy. Now, the human can only absorb a maximum of 200 J of energy.

m = 62 kg

g = 9.8 m/s²

⇒ m g h = 200 J

⇒ h = 200 J / (62 kg × 9.8 m/s²) = 0.329 m

Therefore, a person can only fall from a height of 0.30 m safely and without breaking both of their legs.

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High ionization energy is the property of barium that is most directly connected to its chemical reactivity.

Each of their atoms contains two valence (outermost) electrons. Barium has valence electrons in its fifth shell because it is in period 5, or row 5, however it can lose its valence electrons very quickly.

This explains why oxygen and other electronegative substances, like barium, make it so reactive. In a nutshell, when atom size increases, the ionization energy drops.

Barium is larger and has higher energy levels than strontium because it is in a different period—the sixth—than strontium, which is in a different period. As a result, barium will have a lower ionization energy.

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Energy of the σ1s MO  if the h atoms in H₂ were pulled apart to a distance twice as long as its normal bond length then the energy would increase and radius would decreases

If coulomb force is positive and negative then in the hydrogen atom nucleus is positive charge and electron is localized in its 1st orbit and coulombs are said to f final = 2f and if the force increases the energy level increases and the electron and the positive charge are both in the opposite nature so the orbit would be shrinking toward the nucleus so that's why the radius would decreases

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The beryllium, the first element in group 2(a), is the most metallic element in the group. this is false . Beryllium is not the most metallic element in group 2(a)

The Beryllium is the element of group 2(a) and is metal but not the most metallic element. The element which is most metallic element is radium . The is when we move from top to bottom in a group the metallic character increases. the beryllium is on the top so, it is least metallic character.

Thus, The beryllium, the first element in group 2(a), is the most metallic element in the group. this is false . Beryllium is not the most metallic element in group 2(a)

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The molarity of copper II sulphate in the diluted solution would be 7.14 x 10^-3 M , if 4 ml of 0.0259 m cuso4 is diluted to 10 ml with pure water.

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Digital gold.

Silicon is the material of choice in the chip industry. Unlike the metals normally used to conduct electrical currents, silicon is a 'semiconductor', meaning that its conductive properties can be increased by mixing it with other materials such as phosphorus or boron.

Answer:Unlike the metals normally used to conduct electrical currents, silicon is a 'semiconductor', meaning that its conductive properties can be increased by mixing it with other materials such as phosphorus or boron. This makes it possible to turn an electrical current on or off.

Explanation:

Besides nylon, HCl is formed from the reaction of adipoyl chloride and 1,6- diaminohexane , but HCl is the byproduct molecule.

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The +1 charged sulfide ion has the same electron configuration as neutral phosphorus in the ground state. In formula S, sulfur dioxide is the inorganic anion of sulfur.

Below is the electron configuration of ground-state neutral phosphorus with atomic number 15.

Phosphorus-15: 1s, 2s, 2p, 6, 3s, 2p

The electron configuration of sulfur at atomic number 16 follows again.

S-16: 1s, 2s, 2p, 6, 3s, 2p, 4.

A sulfide ion has a negative charge because it contains more electrons than normal. Due to more electrons than protons, an anion has a negative charge in it. Sulfate is an anion because its overall charge is negative. any atom or group of atoms that bears one or more positive or negative electrical charges. Positively charged ions are called cations negatively charged ions are anions.

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The moles in 172 grams of Chromium (IIl) carbonate is 0,6056  moles and there is 3.647x [tex]10^{23}[/tex] molecules.

The moles can be calculated as follows:

The first you should calculate the molar mass

Chromium (IIl) carbonate is Cr2(CO)3

Mass of Chromium = 51.9961 g/mol

Mass of Carbon = 12.0107 g/mol

Mass of Oxygen = 15.9994 g/mol

mass molar = (51.9961 g/mol x2)+(12.0107 g/mol x 3) +(15.9994 g/mol x9) =  284.0189 g/mol

The next step is calculate the moles  

Divide the mass of chromium(III) carbonate by its molar mass to get moles

[tex]\frac{172 grams}{284.0189g/mol}[/tex] [tex]\\[/tex]

= 0.6056 moles

The next step is calculate the molecules

time the moles of chromium(III) carbonate by Avogadro's number

molecules= moles x Avogadro's number

molecules = 0.6056 moles x 6.02214076 ×   [tex]10^{23}[/tex][tex]mol^{-1}[/tex].

molecules= 3.6470 molecules

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According to molar concentration, 30 ml of water  should be added to 15 ml of 12 M HCl  to make it to 6 M solution.

Molar concentration is defined as a measure by which concentration of chemical substances present in a solution are determined. It is defined in particular reference to solute concentration in a solution . Most commonly used unit for molar concentration is moles/liter.

The molar concentration depends on change in volume of the solution which is mainly due to thermal expansion. Molar concentration is calculated by the formula, molar concentration=mass/ molar mass ×1/volume of solution in liters.

In terms of moles, it's formula is given as molar concentration= number of moles /volume of solution in liters.

In the given example,volume required is calculated as, V₂=M₁V₁/M₂

V₂=12×15/6

V₂=30 ml.

Thus, 30 ml of water is added to 15 ml of 12 M HCl to make it to 6 M solution.

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P3 is the symbol for the ion, which consists of 15 protons and 18 electrons.

An atom or a collection of atoms with a charge is an ion. Depending on the process through which the ion is created, the charge might be either positive (+) or negative (-).

1. If the element loses an electron, the ion will be positive (s)

2. If the element involved gained an electron, the ion will be negative (s).

We'll start by locating the element's symbol in order to answer the above-mentioned question. This is attainable as follows:

We learned that the ion had 15 protons from the question that was previously presented. The element's atomic number is this, or 15 protons.

Comparing the atomic sizes now The element whose ion we are searching for is phosphorus, which has the periodic table's corresponding number .

The ion's charge will then be determined. This is attainable as follows:

Electron = 18 Proton = 15

Price =?

Proton - electron equals charge.

Cost: 15 to 18

-3 charge

We will finally determine the ion's symbol. Below is an example to help:

Charge = -3 Proton = 15 Electron = 18

Phosphorus is an element.

P is the element's symbol.

Ion symbol is hence P3.

Consequently, the ion with 15 protons and 18 electrons has the symbol P3.

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Opposing ions join in a double displacement reaction, also known as a double replacement reaction. This implies that the cation of one chemical will join with the anion of another molecule and form a bond, and vice versa.

A displacement reaction is a kind of reaction where a portion of one reactor is replaced by another. A displacement reaction is also sometimes called a substitution reaction or a metathesis reaction.

When one element replaces another in a compound, it causes a single displacement reaction. Neither metal nor a nonmetal may be used as a substitute for another metal. Only a more reactive component of the chemical it reacts with can take the place of the other component.

A precipitation reaction occurs between two aqueous ionic compounds to create a new, insoluble ionic compound. Here is an illustration of a reaction between lead (II) nitrate and potassium iodide that produces (soluble) potassium nitrate and (insoluble) lead iodide.

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The formula mass of each compound. keep at least one decimal place in atomic masses from the periodic table are H₂O₂ = 34.014 g /mol and H₂SO₄ = 98.07 g/mol.

The formula mass is defined as the sum of atomic  masses of each element in the formula. let us take some example:

1)  H₂O₂

mass of hydrogen = 1

mass of oxygen = 15.99

H₂O₂ = ( 2× 1 + 2 × 15.99) = 34.014 g /mol

2) H₂SO₄

mass of hydrogen = 1

mass of sulfur = 32.06 g/mol

H₂SO₄ = ( 2× 1 + 32.06 + 2 + 4 × 15.99) = 98.07 g/mol
Thus, The formula mass of each compound. keep at least one decimal place in atomic masses from the periodic table are H₂O₂ = 34.014 g /mol and H₂SO₄ = 98.07 g/mol.

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