pls help and explain why

Every substance might have its own unique properties. They can be of characteristic physical and chemical properties  by which they can be identified.

Physical properties of a substance include the properties related to its mass, volume, density its phase change etc. Various physical properties include density, conductivity, melting point, boiling point etc.

Chemical properties of a substance include its reactivity, bond type etc. The reactivity of each substance may vary based on their bond type and intermolecular force of attraction. Each substance shows different reactivity  towards air, water, with other metals and chemicals.

Similarly, the state of each substance it mostly exists will be different. Therefore, by determining the physical and chemical properties of the substance, we can identify the substance.

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The pH of an aqueous solution is -0.7459

Let the total volume of the solution where both the mixture of aqueous solution of sodium sulfide and sodium hydrogen sulfite are present be V

no. of moles of H+ coming from Na2S,H20 = 18 * 0.293 * V

no. of moles of H+ coming from NaHS = 0.236 * V

Final concentration of H+ will be

Cf = (18 * 0.293 * V) + (0,23 * V) / V

Cf = 5.57

pH = - log [5.57]

pH = - 0.7459

Negative pH occurs when the molarity of hydrogen ions in a strong acid is greater than 1N (normality)

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In periodic table group 5A consist of nitrogen, phosphorus, arsenic and the group 7A consist of all the halogens.

The periodic table is a table form of chemical elements arranged according to atomic number, starting with hydrogen and ends to oganesson, which has the highest atomic number.

Because they are arranged in table form  of the elements, it is known as the periodic table. They're present in rows and columns. Periods and Groups are the names given to the horizontal rows that comes from left to right and the vertical columns that comes from top to bottom.

Thus, Group 5A contain nitrogen, phosphorus , arsenic compounds while in group 7A contain all the halogens.

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A bomb calorimeter cannot measure the enthalpy of a reaction directly because it operates at constant volume.

The enthalpy changes that accompany combustion reactions are therefore measured using a regular-quantity calorimeter, including the bomb calorimeter is a tool used to degree energy modifications in chemical techniques.

Consistent volume Calorimetry, additionally recognize as bomb calorimetry, is used to measure the heat of a response even as retaining quantity steady and resisting huge amounts of pressure.

The amount of heat transferred inside the method (q) may be calculated from the mass, specific heat, and temperature exchange of the solution. Because the calorimeter is at constant pressure, q is same to ΔH for the method. Created by Jay.

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The required volume of base is 156.25 mL

Titration of a strong acid with a strong base is a quantitative analysis to determine the molarity of an acid or base solution. Phosphoric acid has the chemical formula H₃3PO₄ with an acid valence of 3, while Barium hydroxide has the chemical formula Ba(OH)₂ with a base valence of 2. The volume of base needed can be calculated using the following formula:

(M H₃PO₄) (V H₃PO₄) (valence) = (M Ba(OH)₂ (V Ba(OH)₂) (valence)

We have,

M H₃3PO₄  = 2.50 m

V  H₃3PO₄  = 50 ml

Valence = 3

M Ba(OH)₂ = 1.2 m

V Ba(OH)₂ = ?

Valence = 2

So,

(M H₃PO₄) (V H₃PO₄) (valence) = (M Ba(OH)₂ (V Ba(OH)₂) (valence)

(2.50) (50.0) (3) = (1.20) (V Ba(OH)₂) (2)

375 = 2.40 V Ba(OH)₂

V Ba(OH)₂ = 375/2.40

= 156.25 mL

So, The required volume of base is 156.25 mL

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When a force of 200 N is exerted on an object of mass 40kg, the acceleration is 05 m/s².

We know that, F = ma ... (i)

where F ⇒ Force

m ⇒ mass

a ⇒ acceleration

Given,

F = 200 N = 200 kg ms⁻²

m = 40 kg

By putting the values of F and m from the above question into equation (i), we get:

200 kg ms⁻² = 40 kg × a

a = 200 kg ms⁻² / 40kg

a = 5 ms⁻² or 5 m/s²

Hence, when a force of 200 N is exerted on an object of mass 40kg, the acceleration is 05 m/s².

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The term chemical weathering is said to occur when water reacts with carbon dioxide to produce carbonic acid, weakening the rock.

The term weathering has to do with the breaking down of the rock. Now we know that rocks are defined as the solid part of the earth's crust. We can find the rocks either at the surface or under the earth.

The process of the breakdown of the rocks can be initiated by many processes and one of the processes is by the break down of  the rock by the hydrolysis of the minerals that can be found in the rock. This owes to the formation of acid in the rocks.

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The mass of hydrogen that will be produced when 195 mg of potassium is added to water would be 5 mg.

From the balanced equation of the reaction:

[tex]2K + H_2O --- > 2KOH + H_2[/tex]

The mole number of the potassium that reacts to the mole of the hydrogen gas that is produced is 2:1.

If 195 mg of potassium reacts:

1 mg = 0.001 g

195 mg = 195 x 0.001

            = 0.195 g

Recall that: mole = mass/molar mass

Molar mass of potassium = 39 g/mol

mole of 0.195 g potassium = 0.195/39

                                             = 0.005 mol

From the stoichiometric mole ratio, the equivalent mole of hydrogen gas produced would be:

       0.005/2 = 0.0025 mol.

Molar mass of hydrogen gas = 2 g/mol

Mass of 0.0025 hydrogen gas = 0.0025 x 2

                                                   = 0.005 g

0.005 g = 0.005 x 1000

             = 5 mg

This means that 0.005 g or 5 mg of hydrogen gas will be produced when 195 mg of potassium is added to water.

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If 17 grams of silicon are required, then 7.2 grams of Mg are needed to react.

The balanced chemical equation of the reaction of SiCl₄ and Mg is,

SiCl₄ + 2Mg → Si + 2MgCl₂

So, as we can see from the reaction,

2 moles of Mg reacts, it forms one mole of silicon.

We know,

Moles = Mass/molar mass

we can write,

2 moles of Mg = mole of Si

2 x mass/molar mass = mass/molar mass

Molar mass of Si is 28 g/mol.

Molar mass of Mg is 24 g/mol.

The mass of Silicon required is 17 grams.

Putting the values,

2 x mass/24 = 17/28

Mass of Mg required is 7.2 grams.

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Silver is most likely the best conductor of heat according to the periodic table.

The most electrically conductive component is silver, taken after by copper and gold. Silver too has the most elevated warm conductivity of any component and the most noteworthy light reflectance.

The components can be classified as metals, nonmetals, or metalloids. The most electrically conductive component is silver, taken after by copper and gold. Silver too has the most elevated warm conductivity of any component and the most noteworthy light reflectance.

As to why silver is the most excellent conductor, the reply is that its electrons are more liberated to move than those of the other components.

This has got to do with its valence and gem structure. Most metals conduct power. Other components with tall electrical conductivity, are aluminum, zinc, nickel, press, and platinum. Brass and bronze are electrically conductive amalgams, instead of components.

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Answer:

C. .25 g/cm^3

Explanation:

density = mass ÷ volume

25÷100

0.25

While determining the volume during this experiment .if the total volume of the flask were incorrectly reported as 125 ml,  this error affect the calculated molar mass of the unknown volatile liquid. yes

The number of mole calculated by the following formula :

number of moles = mass / molar mass

greater the number of number of moles low the molar mass.

the ideal gas equation is given as :

P V = n RT
and the volume is directly proportional to moles . if the volume increases molar mass decreases.

Thus, While determining the volume during this experiment .if the total volume of the flask were incorrectly reported as 125 ml,  this error affect the calculated molar mass of the unknown volatile liquid. yes

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The pH of the solution which was made by mixing 40ml of 0.100 M HCL with 25.00ml of 0.100 M KOH is 1.669.

The base and the acid have the same molarity, but the acid's volume is more than the bases' volume, hence after mixing the resultant solution is acidic.

The concentration of OH⁻ solution in the mixture is

= (molarity of base * volume of base - molarity of acid * volume of acid) / total volume

= (40 mL*0.1M - 25 mL *0.1 M ) / (40 mL +25mL)/ 1000)

= 0.021428571 M

pH = -log(0.021428571) = 1.669

Hence the pH is 1.669

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According to the given statement potassium  minerals participates in antioxidant reactions.

Redox control of signaling pathways is important in defining the expression of genes and cells in response to peroxidation because natural antioxidants play a vital role in lowering ROS/RNS levels.

By neutralizing free radicals, complexing prooxidative ions, quenching molecular oxygen and phototherapy, and inactivating lipoxygenase, antioxidants prevent food from oxidizing. An antioxidant is a substance that has the power to prevent another molecule from oxidizing; in other words, an antioxidant is a limiting reagent stable enough to give an atom to a free radical in motion, neutralizing it.

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The molarity of the ethanol is 11.29M .

What is molarity ?

Molar concentration, also known as molarity, amount concentration, or substance concentration, is a unit used to describe the amount of a substance in a solution expressed as a percentage of its volume. The number of moles per litre, denoted by the unit symbol mol/L or mol/dm3 in SI units, is the most widely used unit for molarity in chemistry. One mol/L of a solution's concentration is referred to as one molar, or 1 M.

The mass of one mole of ethanol is 46.07 g/mol.

The number of mole in 50.500 g ethanol is 50.500/46.07 = 1.096158 mole.

We know that,

Mass = Density × Volume.

The final volume of the solution 750.0ml and the density of the solution is 1.20g/ml.

The mass of the solution is 1.20g/ml × 750.0ml = 900 gm.

The mass of water is (900-50.500) = 849.5 gm.

So the term molarity is defined as:

One of the most common units of concentration, expressed in M. It is defined as no moles of solute in 1 liter of solution.

The molarity of the solution is:

(1.09615 × 1000)/ 849.5  = 1.29M (approx.).

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Answer:

Physical changes are those in which the shape, size, or state of the matter changes, but the substance is still essentially the same. Chemical changes are those where one or more substances are combined to produce a new substance.

Explanation:

For example, chopping up a carrot or ice melting into water are both physical changes. Chemical changes are those where one or more substances are combined to produce a new substance. At the end of a chemical change, you have a new substance. Burning a piece of paper would be a chemical change, as would baking a cake. Ozone is an invisible gas made of 3 oxygen atoms.

An infrared wave has a wavelength of 0.00005 m. this wavelength in scientific notation is 5.0 × 10⁻⁵ m.

Scientific notation is also called as standard form. Scientific notation is used to express the number that is too large number  or too small is  convenient written in a decimal form. scientific notation contains two part decimal number multiply power of 10.

given data is as follows :

infrared wave has wavelength = 0.000005 m

the scientific notation of the wavelength given is = 5.0 × 10⁻⁵ m

Thus, An infrared wave has a wavelength of 0.00005 m. this wavelength in scientific notation is 5.0 × 10⁻⁵.

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As the volume of  the sound is seen to increase, the sound that we hear is louder as the amplitude of the sound increases.

Sound is a kind of wave that moves through a medium. We know that sound has to move via several compressions and rare factions. This implies that sound is as well propagated through air. The movement of the sound waves through air is because the air is set into vibration by the sound. Thus, the air is very imprtant in the movement of the sound waves.

With this much said, we can see that if there is more air, there would more molecules that can be set into vibration and the sound wave would tend to increase and that is the deal that we are trying to communicate here.

Thus, the amplitude of air increases as the volume of  the sound gets higher and the sound that we hear is much louder.

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The reactivities of tert-butyl bromide and 2-bromopropane are related to the stabilities of the carbocations produced as intermediates in the reaction in several ways.

First, it is important to note that tert-butyl bromide has an electron-withdrawing group (carbonyl) attached to its aromatic ring. This makes it more reactive than 2-bromopropane because it is easier for tert-butyl bromide to achieve a favorable resonance structure.

Second, it is also important to note that tert-butyl bromide has a more stable carbocation intermediate than 2-bromopropane because it has a larger number of bonds between carbon atoms. This means that these bonds take longer to break apart during the transition state, which makes it harder for tert-butyl bromide's intermediate to form.

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This is a synthesis reaction we're given that aluminium (Al) can react with oxygen gas (O2 to produce aluminium oxide (Al2O3).The balanced chemical equation for this reaction is 4Al(s)+3O2(g)→2Al2O3(s)

When two separate atoms or molecules interact to create a new compound or molecule, the process is known as a "synthesis reaction." The majority of the time, energy is released and an exothermic reaction takes place during a synthesis reaction. An endothermic result is also conceivable, though. When sodium (Na) and chlorine (Cl) are combined, sodium chloride is created. This is an illustration of a synthesis reaction (NaCl). Al2O3 is the chemical formula for the compound of aluminium and oxygen known as aluminium oxide. It is precisely referred to as aluminum(III) oxide and is the most prevalent of various aluminum oxides. Aluminum oxide is utilized for its strength and hardness.

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Fossil fuel can be made to burn cleaner and reduce carbon dioxide emissions if it is combined with purified oxygen is coal.

Coal can be made to burn cleaner and reduce the carbon dioxide it it will combine with the purified oxygen. coal is type of fossil fuel. coal is black in color or brownish black. the fossil fuel coal is made up of plant. the plant gets their energy from the sunlight so, it is clear that col is from sun.  fossil fuels are non renewable source of energy.

Thus, Fossil fuel can be made to burn cleaner and reduce carbon dioxide emissions if it is combined with purified oxygen is coal.

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Answer: Rusting Photosynthesis

Explanation: Hope this helps

The correct answer is 25%. Option A.

Solution:

mass of NaCl (solute) = 50 g

mass of H2O (solvent) = 150 g

Mass of solution = mass of solute + mass of solvent

= (50 + 150) g

= 200 g

Concentration of mass% (m/m) = (mass of solute / mass of solution) x 100 %

= (50/200) x 100 %

= (0.25) x 100 %

= 25.0%

Therefore answer is 25.0% (m/m)

The mass percentage is calculated by dividing the mass of one component by the total mass of the mixture and multiplying by 100%. A mole fraction is a unit of concentration defined as the number of moles of a component divided by the total number of moles in the solution. Solution mass percent is defined as the mass of solute present per 100 grams of solution.

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The electron dot structure that correctly illustrates diatomic nitrogen with a triple bond is of diatomic nitrogen which is N≡N.

A Lewis Structure is a simplified representation of the valence shell electrons in a molecule. It is used to show the arrangement of the electrons is arranged around atoms in a molecule.

Usually in Lewis Structure, Electrons are represented by dots but in the case of bonds such as given in the given question, they are represented by lines.

Thus the electron dot structures that correctly illustrate diatomic nitrogen with a triple bond is of diatomic nitrogen which is N≡N.

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It will take 24 days for 100 atoms of radium-223 to decay with only 25 atoms of radium-223 left

Half-life is the time required for a quantity to a radioactive substance reduce to half of its initial value. The term is often used in nuclear physics to describe how quickly an unstable atom radioactively decays or how long a stable atom survives. The term can also be used to characterize any type of exponential decay.

Given,

Half life of radium-223 = 12 days

If 100 atoms decay leaving 25 this means = 3/4 decay

Aₓ = A₀ × [tex](\frac{1}{2}) ^{\frac{t}{t_{1/2} } }[/tex]

Where, Aₓ = the amount left after t years

A₀ = the initial quantity of the substance that has to be decayed

[tex]t_{1/2}[/tex] = the half-life of the decay

So, for 3/4 decay:

A₀ × 1/4 =  A₀ × [tex](\frac{1}{2}) ^{\frac{t}{t_{1/2} } }[/tex]

1/4 =  [tex](\frac{1}{2}) ^{\frac{t}{t_{1/2} } }[/tex]

[tex](\frac{1}{2} )^{2}[/tex] =   [tex](\frac{1}{2}) ^{\frac{t}{t_{1/2} } }[/tex]

[tex]\frac{t}{t_{1/2} }[/tex] = 2

Since, Half life of radium-223 = 12 days

then,

t/12 = 2

t = 12 × 2

t = 24 days

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ml= 0 ms = +1/2 are the values of the ml and ms quantum numbers for this electron

What is quantum numbers ?

A total of four quantum numbers are used to fully describe the motion and trajectory of each electron in an atom. The combination of all quantum numbers of all electrons in an atom is described by a wave function corresponding to the Schrödinger equation. . Quantum numbers are important because they can be used to determine the electron configuration of atoms and the putative positions of atomic electrons. Quantum numbers are also used to understand other properties of atoms such as: B. Ionization energy and atomic radius.

Atoms have four quantum numbers: principal quantum number (n), orbital angular momentum quantum number (l), magnetic quantum number (ml), and electron spin quantum number (ms). The principal quantum number n is the energy of an electron and probable distance from the nucleus. In other words, it says to the size and energy level of the orbital in which the electron is placed. The number of subshells or l describes the shape of the orbitals. It can also be used to determine the number of angular nodes. The magnetic quantum number ml represents the energy level in the subshell and ms represents the electron spin. This is either upwards or downwards.

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The photons have been calculated to contain about 4.97 * 10^-47 J/mol of energy.

We know that a photon is a unit of light. Better put, we can see the photon as a bundle of light and we are able to obtain the energy of that bundle of light as we can see.

Given that;

E = hf

E = energy of the photon

h = Plank's constant

f = frequency of the photon

Then

E = 6.6 * 10^-34 Js * 4.53 x 10^10 s-1

E =  2.99 * 10^-23 J

A mole would have to contain about 6.02 * 10^23 molecules so;

Energy per mole =  2.99 * 10^-23/6.02 * 10^23

= 4.97 * 10^-47 J/mol

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Missing parts;

How much energy, in joules per mole (J/mol), does a photon in the microwave region of the EM

spectrum, contain? Assume the microwave has a frequency of 4.53 x 1010 s-1. Your answer should

have 3 significant figures.

A compound is formed by combining a polyatomic cation and a polyatomic anion. The compound can be ammonium sulphate and the  chemical formula for the compound is (NH₄)₂SO₄.

The ammonium ion is a polyatomic cation - NH₄⁺ and the polyatomic anion that is sulfate ion - SO₄²⁻. The polyatomic cation and the polyatomic anion combine and for the polyatomic ionic com pounds. Ionic bond is formed between a positively charge ion and the negatively charge ion.

Thus, A compound is formed by combining a polyatomic cation and a polyatomic anion. The compound can be ammonium sulphate and the  chemical formula for the compound is (NH₄)₂SO₄.

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1930 coulombs are required to produce 77.0 g of lithium metal from a sample of molten lithium chloride.

Weight of metal deposited = ECt / 96500, Applied charge= 1930C

Efficiency= 77%

Effective charge=  77/100 (1930)=1486.1C

96500C liberate 1 mole.

1447.5C liberates 1486.1 / 96500  moles = 0.0154 moles .

LiCl-Li, a molten mixture of metallic lithium and lithium chloride, are crucial to the electrolytic reduction of a variety of metal oxides. Researchers have been studying these mixes' distinctive high temperature physical and chemical characteristics for decades.

Lithium metal is primarily made from lithium chloride by electrolyzing a LiCl/KCl melt at 450 °C (842 °F). LiCl is additionally employed in automotive parts as an aluminum brazing flux. As a desiccant, it dries out air streams.

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There are two atoms of hydrogen on the reactant side of the equation.

What we try to show on paper are the changes that substances can undergo. A reaction is said to occur when two or more substances are combined together. The combination of the substances would now lead to the rearrangement of bonds and then the formation of a new product.

We know that it is one of the rules of writing a balanced chemical reaction equation that the number of the atoms of each element on the reactant side must be the same as the number of atoms of the same element on the products side.

When we look at the reaction as shown, we can see that the reaction is balanced hence we can be able to find the number of atoms of hydrogen on the reactants side by doing an atom count.

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