If the volume of a sample of gas is doubled while holding the temperature of the gas constant, then the pressure of the gas is.

Nothing is destroyed by burning or other modifications to matter. Before and after changes always occur, the mass of the substance remains constant. According to the principle of conservation of mass, matter cannot be created or destroyed.

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Explanation:

a. i. R and Z (same number of protons but different number of neutrons therefore are isotopes of the same element).

ii. Q (has more portons than electrons).

iii. X (has more electrons than protons).

iv. L (mass number = protons + neutrons).

v. M (belongs to group 1 alkali metals which are of very reactive metals).

b. 12 (atomic number= number of protons).

c. 7 (X has 9 electrons before ionisation, therefore 7 electrons in the outer most shell).

Q (is also from ionisation reaction).

hope it helps :)

A. (i). Two identical atoms with the letters Q and Z each contain 17 protons.

ii. Protons outnumber electrons in a positive ion. R, which has 17 protons and 17 electrons, is the only atom or ion that has more protons than electrons. It removes an electron to form a positive ion with a charge of +1: R+.

iii. In a negative ion, the number of protons is more than the number of electrons. J has 16 electrons and 16 protons, making it the only atom or ion with more electrons than protons. It becomes a negative ion with a charge of -1, or J-, by the addition of one electron.

iv. Such an atom or ion has the letter M and has 11 protons and 12 neutrons. It adds a proton to form an atom with a mass number of 20: N with 12 protons and 8 neutrons.

v. Group 1 of the periodic table consists of metals that are extremely reactive. L, an atom in group 1 with 10 protons, is the only one in the table to have this characteristic.

The fundamental building block of matter, an atom, nevertheless has the characteristics of an element. It consists of a small, compact nucleus with positively charged protons and electrically neutral neutrons surrounded by orbitals of negatively charged electrons.

For the above example,

(b) An atom with an atomic number of 12 has 12 electrons because an atom has exactly the same number of protons in the neutral state as electrons.

(C)

(i) X has exactly 11 protons, the same number of protons as the atom or ion M has. Group 1 of the periodic table, commonly known as the alkali metals, consists of elements with 11 protons.

(ii) An alkali metal is another atom that interacts in the same way as the substance from which ion X is made. According to the table, the only atom in group 1 is L, which has 10 protons. However it lacks the 11 protons of the alkali metals mentioned above

Therefore, two identical atoms with the letters Q and Z each contain 17 protons.

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A certain red light has a wavelength of 680 nm. then, The frequency of the light is 4.4×10^14 s^-1 .

Given,

A certain red light had a wavelength = 680nm

frequency is given by,

f =c/λ

where, f = frequency

c = speed of light = 3×10^8 m/s

λ = wavelength = 680nm

f = (3×10^8 ) /(680× 10^-9 )

f = 0.0044×10^17 = 4.4×10^14 s^-1

Hence, the frequency of the light is 4.4×10^14 s^-1 .

The distance between the two crests or troughs of the light wave is known as the wavelength of light. Using the Greek letter lambda (), it is identified. As a result, wavelength refers to the separation between one wave's crest or dip and the following wave.

The formula for wavelength is given by,

wavelength= speed of light /frequency

According to the definition of frequency, it is the quantity of full wave cycles that pass a spot in a unit of time.

Hertz is the SI unit for frequency (Hz).

The number of full oscillations that any wave element makes in one unit of time is the frequency of a sinusoidal wave.

Frequency is in periodic motion; after going through a number of different situations or postures and then returning to its initial place, it has completed one cycle.

The reciprocal of a wave's period is equal to the wave's frequency.

The frequency mathematical expression is:

frequency = speed of light / wavelength

The length of time it takes for any string element to complete an oscillation is known as a wave's oscillation period.

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Dehydration Synthesis is the reaction which is responsible for the production of lipids when glycerol is bonded to three fatty acids by the removal of water molecule.

Dehydration synthesis is the creation of larger molecules from smaller monomers and a removal of water molecule takes place .This type of reaction is also classified as condensation reactions.

During this process, the hydrogen of one monomer combines with the hydroxyl group of another monomer releasing a molecule of water. In the attached image, glycerol and fatty acid combine to release water and a lipid molecule is formed.

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The energy of a photon can be calculated by multiplying Planck's constant by the frequency of the light.

According to this question, the relationship between the energy of a photon and the frequency of light was determined by Ernst Planck. He proposed a equation as follows:

E = hf

Where;

The energy of a frequency 4.0 × 10¹⁴ Hz can be calculated as follows:

E = 6.626 × 10-³⁴ × 4 × 10¹⁴

E = 2.65 × 10-¹⁹J

λ = hc/E

λ = 6.626 × 10-³⁴ × 3 × 10⁸/2.65 × 10-¹⁹

λ = 1.988 × 10-²⁵/2.65 × 10-¹⁹

λ = 7.5 × 10-⁷m

Therefore, 7.5 × 10-⁷m is the wavelength of the photon.

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The nuclide symbol for an atom with 26 protons 31 neutrons and 24 electrons is X⁵⁷₂₆ .

This scientific model is expressed in the form ᵃₙX, where a denotes the total number of protons and neutrons and is also referred to as the mass number, n represents the number of protons which is the atomic number.

Since the number of proton given is 26, then n which is the atomic number is 26. The mass number is the total number of protons and neutrons.

26 + 31 = 57.

Since therefore means that a which is the mass number is 57.

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Answer: Energy of motion :)

Answer: the answer to your question is the energy of motion

Explanation:

The first drop of distillate would contain 33 mol% of toluene and 67 mol% of cyclohexane. We can reach this conclusion by consulting the boiling point composition curve attached.

When analyzing the composition of the vapor phase and the liquid phase during the distillation of two liquids with different boiling points, it is necessary to use the boiling point composition curve.

We begin on the right by finding the point on the curve that corresponds to our initial mixture composition (90 mol% toluene, 10 mol% cyclohexane). We then move to the left, to find the composition of the vapor phase. This will be the composition of the distillate after one theoretical plate (approximately 67 mol% toluene, 33 mol% cyclohexane). Because we have two theoretical plates, we repeat the process, but now the composition of the liquid phase is the same as the vapor phase because we are now basically distilling our first distillate for the second time.

So we again move to the left to find the composition of the vapor phase, which will be the composition of our distillate after two theoretical plates: 33 mol% toluene and 67 mol% cyclohexane.

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Atoms of 124sn are present in 23.0 g of naturally going on the tin: The average atomic mass of Sn is 118. seventy-one g/mole percentage.

This is explained as the Atomic mass of Tin (Sn) = 118.71 g/mol. 1 mol of Sn = 118.71 g.

An atom is the smallest unit of everyday count that bureaucracies a chemical detail. each solid, liquid, gas, and plasma consists of neutral or ionized atoms. Atoms are extraordinarily small, commonly around one hundred picometers throughout.

An atom is a particle of count that uniquely defines a chemical detail. An atom includes a principal nucleus that is surrounded by one or extra negatively charged electrons. Atoms are built of two kinds of elementary particles: electrons and quarks. Electrons occupy an area that surrounds an atom's nucleus. each electron has an electrical rate of -1. Quarks make up protons and neutrons, which, in flip, make up an atom's nucleus.

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The balanced reaction equation for this redox reaction is:

4NO(g) + O₂(g) → 2N₂O₃(g)

The rate of [NO] decreasing is 1.054 M/s.

This is a redox reaction, so to balance it, we need to identify which elements change their oxidation state. Obviously, nitrogen is oxidized from +2 (N²⁺O²⁻) to +3 (N⁺³₂O²⁻₃), and oxygen is reduced from 0 (O⁰₂) to -2.

N²⁺ → N⁺³ + e⁻

O⁰₂ + 4e⁻ → 2O²⁻

In order for the number of electrons released and taken to be the same, we  need to multiply the number of nitrogens by 4:

4N²⁺ → 4N⁺³ + 4e⁻

O⁰₂ + 4e⁻ → 2O²⁻

We can now apply these numbers to the reaction equation:

4NO(g) + O₂(g) → 2N₂O₃(g)

With the balanced reaction equation, we can see that 4 moles of NO produce 2 moles of N₂O₃. So if 0.527 M were produced in a single second, the rate of NO decreasing would be 2 * 0.527 M = 1.054 M/s.

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When multiplied by salicylic acid's molecular weight of 1 80.158, it will be equal or smooth. If we compute it now, we will see that the mask, or theoretical yield, is equal to $4.57 million.

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The colour of Variamine blue salt B, a redox indicator changes from yellow to colourless at the endpoint of the complexometric titration indicating alkalinity.

Complexometric titration (also known as chelatometry) is a type of volumetric analysis in which the creation of a coloured complex is utilized to determine the titration's end point. Complexometric titrations are extremely useful for estimating the concentration of a metal ion mixture in solution. EDTA, or ethylenediaminetetraacetic acid, is a frequent indicator for complexometric titration because it may function as a ligand, binding to coordination centers, which are generally metals, to produce colourful complexes. Organic dyes are the most commonly used indicators in complexometric titrations because they generate a colourful complex with the metal ion being titrated. EDTA replaces the indicator during the reaction to create a more stable complex with metal, and when the reaction is through, the colour changes.

The alkalinity of solution is indicated by a colour change from yellow to colourless in the complexometric titration using Variamine blue salt B as the indicator.

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Answer:

So in this problem, were asked to calculate how much heat is required to raise the temperature of a certain amount of water from 25.52 degrees Celsius to 28.75 degree Celsius. So let's start with our equation that relates are variables que which is he is equal to mass proof. That is a rough em mass time specific heat times the change in temperature. So we're looking for heat and mass. We do not have mass, but we do have both the density and the volume of water. And so to find mass weaken knew our 50 milliliters that were given in the problems them times the density of water which is point nine 97 grams for one Miller Leader, Let me fix this night up here seven is well, that is our mess. Variable. We know just from looking at the table 6.1 in the chapter that the specific heat of water is four 0.184 Jules per gram killed in and finally we know that the change in temperature just gonna switch this down. Here is the final temperature 28 0.75 degrees Celsius minus our initial temperature, 25 0.52 degrees Celsius. And we can just plug this into a calculator really quickly. 28 2.75 I'm just going to start on this side of the equation. So the change in temperature is 3.23 degrees Celsius. Times are specific. Heat 4.184 and then times are mass, which is 50 times 500.997 And we get our final answer of 600 73 point.

Answer:

b

Explanation:

water is generally transparent and smooth to the touch unless it is frozen, then it is rough

To derive precise results, it is important for other variables in an experiment to be controlled. Accuracy and precision are the key factors of every practical experiment carried out.

During the course of experiments, special emphasis is laid on the objective of the experiment. Procedures and precautions are highly objective-oriented. There are possibilities of errors as the surrounding becomes an integral part of the system in practicals.

Certain physical and chemical quantities are ignored in theoretical assessment, but they affect the practical work. Impurities and uncontrolled reactions can be barriers. Optimum conditions are sought before conducting experiments.

The main idea of the excerpt chemistry in centuries is all the matter present are composed of the atoms.

Aristotle declared that only four element exist in nature. They are -

Air, water, earth, fire.

He stated that all matter are composed of these four elements only.

When the atoms reacts, they form a chemical bond. It is defined as a force of attraction which holds the atoms together to form a compound.

Force of attraction is defined as a type of force which keeps two or more objects close to each other, or together no matter how far or close they are in distance.

Two major categories of forces of attraction are - intramolecular forces and intermolecular forces. Intramolecular is the type of forces in atoms which are present internally. While intermolecular is the type of force which is present in two or more elements.

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When excess base is added in order to detect the end point, then it will cause the calculated and reported mass percent of acetic acid in vinegar to be too high.

A titration is a method of quantitative chemical analysis, in which the concentration of an unknown solution called the analyte, by using a solution of known concentration, called the titrant.

The titrant solution from the burette is added slowly to the analyte solution, in the conical flask, in order to determine the end point of the titration. The end point is indicated by a change in color of the solution in the presence of an indicator.

An acid-base titration involves a neutralization reaction between an acid and a base.

As given in the question, the concentration of acetic acid solution is being determined by sodium hydroxide (NaOH) solution of known concentration.

Therefore, Sodium hydroxide is the titrant and is taken in the burette. Whereas, acetic acid is the analyte which is taken in the conical flask and two- three drops of the indicator is added to it.

Example of the indicator that can be used in an acid-base titration is phenolphthalein. Phenolphthalein is colorless in acidic medium and pink in basic medium.

Initially, the analyte acetic acid solution will be colorless. Since, phenolphthalein is colorless in acidic medium.

Then, NaOH solution will be slowly added from the burette to the acetic acid solution. On reaching the end point, a slight excess amount of the NaOH base is added from the burette.

The excess amount of NaOH makes the solution in the conical flask basic. Therefore, changing the color of the solution, from colorless to pink. Since, phenolphthalein is pink in basic medium.

This excess amount of the titrant i.e. NaOH solution added, increases the volume of the NaOH solution being used in the titration.

Since, acetic acid is directly proportional to volume of NaOH or any base used, then even a slight increase in the volume of the NaOH solution, increases the concentration or molarity of acetic acid

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the answer is 6.0°C that is the solution

The arrangements of the molecules of a solid, liquid and gas  as follows

1. Solid: In this state of matter, the particles are closely bonded to each other. This means that they are closely packed in a system and the arrangement is regular. The intermolecular space between the particles is minimum.

2. Liquid: In this state of matter, the particles are not so closely packed. The arrangement between the particles is not regular. The intermolecular spacing between the particles is more than solid but less than gaseous state.

3. Gases: In this state of matter, the particles are very far away from each other and the arrangement is not regular. The intermolecular spacing between the particles is very much in case of gases.

The solid, liquid, and gaseous phases of matter are the three basic states of matter.

Every item we encounter every day—from ice cream to chairs to water is composed of matter. Based on intermolecular forces and the arrangement of the particles, matter can be divided into distinct states such as solid, liquid, and gas. By altering specific environmental variables, these three types of matter can change their state of matter (increasing or decreasing pressure and temperature, for instance). For instance, raising the temperature will cause ice to melt from a solid state.

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Independent variable: Hole height

Water squirting distance is a dependent variable.

The size of the perforations in the milk carton is constant.

During experiments, the value of the independent variable is frequently changed, and the impact of the change on the dependent variable is then measured.

The variable that is actually being measured during an experiment is known as the dependent variable. Changes in the independent variable's values have an impact on the dependent variable's value.

Variables that don't vary over the course of an experiment are known as constants.

Hence, in the illustration:

Independent variable: the height of holes on the milk carton

Dependent variable: distance of squirting water

Constant: the size of holes punched into the milk carton

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COMPLETE QUESTION:

Directions: Read the given scenarios below. Identify each required component for each scenario.

Scenario 1:

A student is studying how far room-temperature water would squirt out of a plastic milk carton when 4 mm holes are punched at different heights from the bottom of the container. Describe which are the independent and dependent variables as well as indicate the constants involved within the experiment and why those are the constants.

Independent Variable:

Dependent Variable:

Constants:​

FeO + Fe3O3 + 1/2O2 → 2Fe203

→ Molar mass of Fe2o3 = 159.69g/mol

→ Molar mass of FeO = 71.84g/mol

→Molar mass Fe3o4 = 231.53g/mol

1. first of all , let consider the amount of Fe in Fe2O3

Atomic Mass of Fe = 58.845 g/mol

Percentage of Fe in Fe2)3 = ( 2 x mass of Fe / Molar Mass Fe203) = 2x(55.845) /159.69g/mol

= 0.6994 * 100 = 69.94 %

2. Mass of Fe in 4.195g of Fe2O3 will then be :

0.06994 * 4.195g = 2.934 g

3.(i) percentage of Fe in FeO = (55.845 / 71.84g/mol ) = 0.77735* 100 =77.735

(ii)percentage of Fe in Fe3O4 = (3x 55.845)/231.53g/mol= 0.72359*100 =72.359

(remember , we only have molar mass of FeO as well as molar mass for Fe3O4 , we do not have their mass)

4. so we will say; let x be the mass for Fe3O4

and ; let y be the mass of FeO

However , the mass of FeO and FeO3O4 must equal 3.970 as given in the question.

meaning x +y = 3.970; therefore x = (3.970-y)

But, we also know from the above percentage calculations; that :

• Mass of Fe in FeO = 0.77735 = 0.77735 ,y

• Mass of Fe in Fe3O4 = 0.72359 = 0.72359,x

5. now lets solve for x and y by equating the above:

0.77735 y + 0.72359x =2.934 g

0.77735 y + 0.72359(3.970-y) =2.934 g

solving for y; you will get :

0.07735y + 2.8726 -0.72359y = 2.934

0.05385y = 0.061347

therefore y = 1.142 g = mass of FeO

Finally :

Mass percentage= (Mass FeO /given mass of the mixture ) * 100

= 1.142g/3.970 *100

= 28. 7 %

The reaction classification of the reaction, [tex]A_2B (l) -- > A_2 (g) + B_2 (g)[/tex], is a decomposition reaction.

In chemistry, a decomposition reaction is one in which a compound or a reactant decomposes to produce two or more chemically unique substances as the products.

Thus, a typical decomposition reaction can be written as:

AB ---> A + B

Decomposition reactions are the opposite of combination reactions. In combination reactions, two or more reactants combine to form a single product. A combination reaction can be written as:

A + B ---> AB

Considering the reaction in question:  [tex]A_2B (l) -- > A_2 (g) + B_2 (g)[/tex]

[tex]A_2B[/tex] is the reactant. It undergoes a reaction to produce [tex]A_2[/tex] and [tex]B_2[/tex] respectively. In other words, the reaction is a decomposition reaction.

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The concentration of the calcium ions in the solution is obtained as 0.013 M

Now we have to find the concentration of the calcium ions, we have to look at the question. We can see from the question that;

Mass of calcium carbonate =  0.3205g

Number of moles of calcium carbonate =  0.3205g /100 g/mol = 0.003205 moles

Number of moles calcium ions = 0.003205 moles

The question here is that we ought to find the concentration of the EDTA solution and that is what we need to find in the spaces that follow in this answer as we have here.

Concentration of the calcium ions in the solution = 0.003205 moles/250 * 10^-3

= 0.013 M

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Missing parts;

A 0.3205g sample of CaCO3 was dissolved in HCl and the resulting solution diluted to 250.ml in a volumetric flask. A 25 mL sample of the solution required 18.75mL of EDTA solution for titration to the Eriochrome Black T end point. What is the concentration of Ca2+ (mol/L) in the 250.0ml of CaCl2 solution?

Answer:

Ionic compounds are neutral compounds made up of positively charged ions called cations and negatively charged ions called anions. For binary ionic compounds (ionic compounds that contain only two types of elements), the compounds are named by writing the name of the cation first followed by the name of the anion

Explanation:

hope this helps!!

The solubility constant is[tex]$6.4 \times 10^{-9}$[/tex].

The equilibrium for the solubility of the salt, [tex]$\mathrm{MgF}_2$[/tex] is,

[tex]$$\mathrm{MgF}_2(s) \stackrel{\mathrm{H} \cdot \mathrm{O}}{\rightleftharpoons} \mathrm{Mg}^{2+}(a q)+2 \mathrm{~F}^{-}(a q)$$[/tex]

The solubility product constant for [tex]$\mathrm{MgF}_2$[/tex] is,

[tex]$$K_{\text {吶 }}=\left[\mathrm{Mg}^{2+}\right]\left[\mathrm{F}^{-}\right]^2$$[/tex]

The molar solubility of [tex]$\mathrm{MgF}_2$[/tex] is taken as x, the x moles of [tex]$\mathrm{MgF}_2$[/tex]is dissolved in one litre water to produce x moles of [tex]$\mathrm{Mg}^{2+}$[/tex]and 2x moles of [tex]$\mathrm{F}^{-}$[/tex].

[tex]$\begin{array}{lccc} & \mathrm{MgF}_2(s) & \stackrel{\mathrm{H}_2 \mathrm{O}}{\rightleftharpoons} \mathrm{Mg}^{2+}(a q)+2 \mathrm{~F}^{-}(a q) \\ \text { Initial } & x & 0 & 0 \\ \text { Change } & & +x & +2 x \\ \text { Equilibrium } & x & 2 x\end{array}$[/tex]

The solubility product constant for[tex]$\mathrm{MgF}_2$[/tex] is,

[tex]$$\begin{aligned}K_{u p} &=\left[\mathrm{Mg}^{2+}\right]\left[\mathrm{F}^{-}\right]^2 \\&=(x)(2 x)^2 \\&=4 x^3\end{aligned}$$[/tex]

Substitute the solubility of [tex]$\mathrm{MgF}_2$[/tex] as [tex]$1.17 \times 10^{-3} \mathrm{~mol} / \mathrm{L}$[/tex]in the above equation as shown below:

[tex]$$\begin{aligned}K_{i p} &=4 x^3 \\&=4\left(1.17 \times 10^{-3}\right)^3 \\&=6.41 \times 10^{-9}\end{aligned}$$[/tex]

The solubility constant is [tex]$6.4 \times 10^{-9}$[/tex].(using 2 significant figures).

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" 14/7 N and 18/7 N "

Isotopes are two or more different atom types that share the same atomic number and place in the periodic table but have different quantities of neutrons in their nuclei, resulting in various nucleon numbers.

Isotopy is a phenomenon in chemical element atoms defined by a difference in the mass number of an element's atoms, even if the atoms always have the same atomic number.

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- 68.385 kJ amount of heat will be released when 50.0 g of ammonia is condensed at –33 °C.

The standard enthalpy of vaporization of ammonia = 23.3 kJ/mol

This means the energy required to vaporize one mole of ammonia at its boiling point = -33 °C

Let's calculate the heat released when 50.0 g of ammonia is condensed at -33 °C.

The heat released is the opposite of the enthalpy of vaporization i.e Q = -23.3 kJ/mol (-ve sign indicates the reaction is exothermic)

We are given

Mass of ammonia m(NH₃) = 50.0 g

Number of moles of ammonia n(NH₃) = 50.0 g ÷ 17.031 g/mol.

n(NH₃) = 2.935 mol

The amount of heat released when 2.935 mol moles condensed at -33 °C

Q = Hv x n(NH₃).

Q = 23.3 kJ/mol x 2.935 mol

Q = - 68.385 kJ

Thus, -68.4 kJ amount of heat is released when 50 g of ammonia is  condensed at -33 °C,  where negative sign signifies release of heat.

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Answer:

b. nitrogen and phosphorus

Explanation:

Elements in the same column of the Periodic Table have similar chemical properties. Both N and P are in the same column.