For these equations, different acids have been used so you will need to think carefully about how to balance them.
1 In a titration, 20 cm3 of 1.0 mol dm-3 sulphuric acid, H2SO4, reacted with 25 cm3 of NaOH. What was the concentration of the sodium hydroxide?
2 In a titration, 20 cm3 of 1.0 mol dm-3 nitric acid, HNO3, reacted with 25 cm3 of NaOH. What was the concentration of the sodium hydroxide?
3 In a titration, 20 cm3 of 1.0 mol dm-3 phosphoric acid, H3PO4, reacted with 25 cm3 of NaOH. What was the concentration of the sodium hydroxide?
4 In a titration, 25.0 cm3 of 0.5 mol dm-3 sulphuric acid, H2SO4, reacted with 25 cm3 of KOH. What was the concentration of the potassium hydroxide?

There are 2 rearrangements of abcd in which no two adjacent letters are also adjacent letters in the alphabets.

Here's the Complete question:

How many rearrangements of abcd are there in which no two adjacent letters are also adjacent letters in the alphabet? For example, no such rearrangements could include either ab or ba.

(A) 0

(B) 1

(C) 2

(D) 3

(E) 4

Using XXXX

We can't put B in either of the middle positions, as there would only be the far end at which to put both A and C and we can't put two things in one slot. That is, XBXX would require A and C to both be in the red X in order to avoid putting them next to B...can't do that, so B can't go in the middle.

Similarly, we can't put C in either of the middle positions, as there would only be the far end at which to put both B and D and we can't put two things in one slot.

So, B and C must go on the ends.

BXXC can only be filled in as BDAC.

CXXB can only be filled in as CADB.

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The value of x is 5.

We know that,

Molar mass of CuSO​​​4 = 156.609g/mol

Molar mass of H2O = 18.015g/mol

So ,Molar mass of CuSO​​​4 .xH2O = molar mass of CuSO​​​4 +X(molar mass of H2O)

Molar mass of CuSO4.xH2O=[( 156.609) + (18.015)X] g/mol 

mass of CuSO4.xH2O = 0.755gmass of CuSO​​​4 = 0.483g

And if we change 4.895 to a whole number or one significant figure,

then we get 

x = 5 

chemical formula is = CuSO4.5H2O (Blue Vitriol)

What is molar mass?
The molar mass of a chemical compound is determined by dividing its mass by the quantity of that compound, expressed as the number of moles in the sample, measured in moles.

Therefore the value of x is 5.

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The ABS plastic is a polymer which has styrene 28.5% by mass.

A polymer is a substance or material made up of macromolecules, which are very big molecules made up of several repeating subunits.

Styrene and acrylonitrile are polymerized with polybutadiene to create ABS, a terpolymer. Since ABS plastic is amorphous, it lacks a proper melting point.

A polymer called a terpolymer is created when three distinct monomers are copolymerized.

Let the mass of sample ABS plastic = 100 g

Given, mass of Nitrogen (N) in ABS plastic = 11.9 g

Moles of Nitrogen (N) in ABS plastic = 11.9 / 14 = 0.85 mol

1 mole of N is present in 1 mole of acrylonitrile

0.85 mol of N is present in acrylonitrile = 0.85 mol

Moles of acrylonitrile = 0.85 mol

Mass of acrylonitrile = 0.85 mol X 53 g/mol = 45.05 g

Moles of [tex]Br_2[/tex] reacted = 1.56 g / 159.8 g/mol = 0.0098 mol

As given, [tex]Br_2[/tex] and butadiene react in 1:1 by moles

So, moles of butadiene = 0.0098 mol

Mass of butadiene in 2g ABS sample = 0.0098 mol X 54 g/mol = 0.529 g

Mass of butadiene in 100g ABS sample= 0.529 / 2 x 100 g = 26.45 g

Mass of styrene in 100g ABS Sample = mass of sample - mass of butadiene - mass of acrylonitrile

Mass of styrene = 100 – 26.45 – 45.05 = 28.5g

% Mass of styrene = 28.5%

Result:

28.5% of styrene is present in 100g ABS plastic, which is a polymer.

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Yes, the given statement is true that an orbital is described by combining the n quantum number with the l quantum number, for example, 1s and 3p are descriptions of orbitals.

Quantum numbers are those numbers that are used to identify and describe the distribution and position of an electron in an atom.

In general, quantum numbers are classified as principal (n), angular (l) and magnetic (m) and consist of integers starting from 0, 1, 2, 3 and so on.

The estimated values for the principal quantum i.e. 'n' are 1, 2, 3, 4, and so on.

Similarly, for angular quantum numbers i.e. 'l' the values range between 0 and n - 1.

Orbitals are found in sub-shells and are made up of these quantum numbers i.e. n and l.

A two-digit code is assigned to an orbital e.g. 2p or 4f. Here 'n' is the shell whose value is 2 and 4 and 'p' and 'f' are subshells.

If we combine the abovementioned quantum numbers then we see that for shell n= 3 there will be three subshells 3s, 3p, and 3d orbitals.

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Assume that the given alloy nichrome is pure of nickel and chromium then, if 100 g of nichrome contains 20 g of chromium , remaining is nickel thus, it contains 80 g of nickel.

Bronze hardly rust because the iron content in this alloy is very less. The reaction iron + copper sulphate gives iron sulphate + copper.

An alloy is a metallic substance made of two or more metals. For example nichrome is a combination of nickel and chromium and brass is a combination of copper and zinc.

If the 100 g of nichrome with 20 g of chromium purely contains nickel and chromium then, it contains 100-20= 80 g of nickel.

Bronze is an alloy of copper and tin. Rust is iron oxide and since bronze contains only traces of iron hence, it hardly undergo corrosion and form rust.

Iron and copper sulphate reacts to form iron sulphate and metallic copper: iron + copper sulphate [tex]\rightarrow[/tex] iron sulphate+ Cu.

Hence, the mass of 100 g of nichrome with 20g chromium is 80 g. Bronze does not rust because of the small iron content and iron and copper sulphate reacts to give iron sulphate and Cu.

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In a titration, acetic acid is used as the analyte and sodium hydroxide is used as the titrant. At the equivalence point,  ph be higher than 7.

The equivalence point of the titration is that point at which enough titrant has been added to react with all of the substance being titrated. A strong acid with a weak base gives a slightly acidic salt. Likewise, a strong base with weak acid gives slightly basic salt.

When acetic acid react with NaOH then a salt sodium acetate and water is formed. Acetic acid, CH3COOH react with sodium hydroxide, to produce sodium acetate, CH3COONa and water

CH3COO- + H2O ---> CH3COOH + OH-

This reaction of the acetate ion makes the ph greater than 7.

At the equivalence point, moles of acetic acid is equal to the moles of sodium hydroxide. The solution will turn pink as more of sodium hydroxide is added.

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The precise proportion of air to a combustible gas or vapor at which complete combustion occurs is known as the stoichiometric ratio.

To determine the stoichiometry by mass, multiply the quantity of molecules needed for each reactant by its molar mass to get the mass of each reactant per mole of reaction. Divide each by the sum of the reactions to determine the mass ratios.

In the field of chemistry known as stoichiometry, needed quantitative data is ascertained by exploiting relationships between the reactants and/or products of a chemical process. Stoichiometry literally translates as the measure of elements because the Greek words stoikhein and metron both mean element and measure, respectively.

2NH3 (gas) + 5F2 → N2F4 + 6HF

    34g          190g     104g

Quantity of N2F4​ created from 2gNH3 = (104/34) × 2 = 6.12

Quantity of N2F4​ created from 8gF2 = (104​/109) × 8 = 4.38

N2​F4 ​will be limited, and the real product weight is 3.56 g.

Yield % = (Actual product quantity / calculated product quantity) x 100

             = (3.56 / 4.83) x 100

             = 81.28%

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During the production of paper, use a mild base such as calcium or magnesium bicarbonate to neutralize the natural acids occurring in wood pulp, and prevent the formation of additional acids.

Acid-free paper is paper if soaked in water, gives a neutral or basic pH. The production of such paper can be done from any cellulose fiber as long as the active acid pulp is removed during processing. Acid-free paper is a solution to the problem of preserving documents and preserving artwork for long periods.

The wood pulp paper becomes to be acidic from alum-rosin sizing which,  generates sulfuric acid in the presence of moisture. Acids also are formed in a paper by the absorption of pollutants such as mainly sulfur and nitrogen oxides.

The addition of bicarbonate is in excess, to provide the paper with an alkaline reserve to offer protection from further attack by acids remaining in the paper.

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There is the neutron's total kinetic energy. E is the same as the final kinetic energy of the EF-2 carbon nucleus. Okay, I'm down one from k E F one. In other words, Jews, this is 1.3 incremental -13 -4, -3.69 into 10 to the Power -14. 1.3 into a power of 10 to the -13th Minour.

Two will equal twelve in one if we subscribe one river to the neutron and another to carbon. Okay. EI one, which is a brand-new drone's first kind of technology, is equivalent to one three into ten to thirteen. For the first support, no. Half of Mnu square is equal to E I and E F, respectively, as well as one V squared. Additionally, if you apply the law of conservation of momentum, M 1 - M 2 will equal 1 + M 2 into Vi, giving you v = 2 and M 1 - M 2. And to you, multiplied by M1 + M2, is mmhmm.

As a result, if you substitute, the answer to the second equation will be K E F 1, which is equal to half of M 1, which is divided by M 1 plus M 2 entire square to give you square. We make this much simpler. And if we divide KEF one by KEI one, we get four, which is equal to M1 plus M2 divided by M1. Cool square, can you divide 4 M1 12 by M 1 + 12? My father has all this. One divided by M. They were by 1 69, which is equal to 40.

This serves as the first support's response. The final kinetic energy is provided by k e F one as a result of the neutron's current technology being transmitted to carbon during the collision's second support. That is equivalent to 3.69 into 10 and 48 x 1, respectively, and to 1.3 into 10 to the power of 13 and 69. Jews, to the Power -14. There is the neutron's total kinetic energy. E is the same as the final kinetic energy of the EF-2 carbon nucleus. Okay, I'm down one from k E F one. In other words, Jews, this is 1.3 incremental -13 -4, -3.69 into 10 to the Power -14. 1.3 into 10 to the power -13 Minor of the original solution.

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Answer: Hope this helps!

Explanation:

Oxygen has the atomic number 8; its atoms contain 8 protons and 8 electrons. Uranium has the atomic number 92; its atoms contain 92 protons and 92 electrons.

I don't know if this is what your looking for but i think it should help!

A phase change is a physical change involves no bond making or breaking. The heat energy is used to weaken the intermolecular forces of attraction and moves the molecules apart. Thus option C and D are correct.

A phase change is the change in phase or state of the substance. For example, solid to liquid, liquid to gas conversions etc. are phase changes.

During a phase change, no chemical bond is breaked or maked but the intermolecular force of attraction holding the molecules together weakens and moves the molecules apart.

Consider the phase change of solid to liquid. The closely packed molecules in solid uses heat energy to to move apart by weakening the intermolecular force and form the liquid state.

Therefore, during a phase change, heat is used to weaken or break the intermolecular force and increasing movement of particles. Thus options C and D are correct.

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The time (in years) taken for the star's light to reach the earth, given it is 6.78 light years away is 6.78 years

From the definition 6.78 light years speed, we can obtain a formula to calculate time. This is illustrated below:

Speed = distance / time

Cross multiply

Speed × time = distance

Divide both side speed

Time = distance / speed

With the above formula, we can determine the time.

The following data were obtained from the question give above:

Time = distance / speedTime = distance / speed

Time = 6.78 / 1

Time = 6.78 years

Thus, we can conclude that the time required is 6.78 years

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The final concentration assuming the volumes are additive when a 71.0 ml portion of a 1.50 m solution is diluted to a total volume of 258 ml. a 129 ml portion of that solution is diluted by adding 149 ml of water is 0.191 M

This can be solved by using the dilution factor.

So the dilution factor for the first dilution is 71.0 ml to 258 ml

DF1=258/71=3.63

For the first solution, the dilution factor is

3.163, refers that the concentration is decreased by a factor of 3.163.

The concentration of diluted solution is

c(diluted)=1.50/3.63=0.413

Now, you take a sample of 129 mL of this diluted solution and add another 165 mL of water. So,

V(final)=129ml +149 ml=278 mL

The concentration of the 129 mL sample is equal to the concentration of the first diluted solution, i.e. 0.413 M

So,

DF2=278/129=2.155

So, the final concentration is

c(final)=0.413/2.155=0.191 M

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Answer: Calcium carbide (CaC2) reacts with water to produce acetylene (C₂H₂):. CaC2 (s) + 2H2O (g) → Ca(OH)2 (s) + C₂H₂ (g).

Electron configurations, the atomic number of the above element is 2+2+6+2+3=15. The atomic number of the element below the given element is 15+18=33.

Titanium, Nitrogen (N), Phosphorus, Sulfur (S)

The arrangement of an atom's or molecule's electrons in atomic or molecular orbitals is known as the electron configuration in atomic physics and quantum chemistry.

Electron configurations written down. The energy level (the period) should come first when writing an electron configuration, followed by the subshell that needs to be filled and the superscript, which indicates how many electrons are in that subshell. The atomic number Z represents the total number of electrons.

In other words, we adhere to the Aufbau Principle, Pauli-exclusion Principle, and Hund's Rule, which are the three key rules.

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By using the Doppler effect, - 81634.27km/s is found to be the velocity of the cloud.

The Doppler effect can be used to solve this problem. When an observer travels in relation to the wave source, the frequency or wavelength changes from the viewpoint of the observed. The Doppler Effect is commonly used to calculate the velocity of the origin of waves or the velocity of the viewer. The generic waveform and frequency equations are used to derive the Doppler Effect velocity equations. The source velocity may then be calculated by setting the observer velocity to zero.

The Doppler shift in wavelength or frequency is calculated using the following relationship:

Δλ / λne = ν / c

where,

Δλ = wavelength shift

λne = wavelength of stationary source

ν = velocity of source

c = velocity of light = 3 x [tex]10^5[/tex] km/s

Given:

Initial wavelength, λini = 0.2521cm

New wavelength, λnew = 0.1835cm

Calculation:

Wavelength shift,

Δλ = λnew - λini

Δλ = (0.1835cm) - (0.2521cm)

Δλ = - 0.0686

On substitution of the known values in the above equation, we get:

Δλ / λne = ν / c

- 0.0686 / 0.2521 = ν / 3 x [tex]10^5[/tex]

ν = - 0.0686 x 3 x [tex]10^5[/tex] / 0.2521

ν = - 81634.27km/s

Result:

- 81634.27km/s is found to be the required velocity of the cloud moving towards us.

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Answer:

-A positively charged nucleus is surrounded by one

or more negatively charged electrons.

Question a

Step 1

The average atomic mass of the element is calculated as:

--------------------

Step 2

Information provided:

Isotope 1:

10.0 % abundant and 23.8 amu.

Isotope 2:

40.0 % abundant and 24.6 amu.

Isotope 3:

25.8 amu, the % abundant = 100 % - 10.0 % - 40.0 % = 50.0 %

-----------------------

Step 3

Procedure:

Average atom mass = (10.0% x 23.8 amu + 40.0% x 24.6 amu + 50.0 % x 25.8 amu)/100 = 25.12 amu

Answer: 25.12 amu

The idea is to foretell the formation of a carbonyl compound by the reaction between alcohol and too much pyridinium chlorochromate. An oxidizing agent called pyridinium chlorochromate converts the alcohol group into the 1carbonyl group.

The carbonyl molecule that results from the reaction will depend on the reactant's OH group. Pyridinium chlorochromate [PCC] converts primary OH to aldehydes, whereas it converts secondary OH to ketones, and oxidation of tertiary OH has little effect. Alcohols and pyridinium chlorochromate [PCC] react to create a carbonyl molecule.

From primary alcohols to aldehydes and from secondary alcohols to ketones, pyridinium chlorochromate oxidizes alcohols one step up the oxidation ladder. pyridinium chlorochromate will not oxidize aldehydes to carboxylic acids, in contrast to chromic acid. Comparable to Pyridine (the Collins reagent) and CrO3 will both oxidize primary alcohols to aldehydes. Here are two instances of pyridinium chlorochromate being used.

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The red color is emitted when electrons in the gas return to ground state.

From the Bohr model, we know that an electron in atom could be found in its lowest energy state. The electron could receive energy in this lowest energy state and move to a higher energy state called the excited sate. The lower energy state that the electron was at the first is called the ground state of the electron.

As the electrons return to ground states, photons of light of a characteristic wavelength is emitted. The color of the light shows the wavelength of the light emitted.

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Marathon runners well exhibit the differences between the behavior of molecules in different states of matter.

At the starting point before the start of the race, the runners would gather in a common place before the starting line. They would be close to each other and are tightly packed like solid molecules.

After the race was started, some players would start to move fast and some remain in a group for a certain period. They were loosely packed compared to solid.

As the game reaches the end point, the players would be more spread out based on their stamina. They would be more loosely packed compared to solid and liquid.

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Donald rides his bicycle 12 km north, turns around, and then rides the bicycle 9 km back toward his starting point.

He rides total 21 km .

An object, a concept, or a collection of data that can be utilized to start a process or conversation. The essay provided a good place to start for our conversation.

Your beginning point is the location from where you begin a journey. Safaris into northern Tanzania's game parks and reserves depart from the recently constructed airport. From their starting position, they had already traveled a few miles or more on foot.

A baseline is a beginning or the beginning of something.

The baseline line is always crucial and can be used as a basis for comparison.

In many fields, including medicine, the baseline data—which is the data discovered at the start of a study—is employed.

Every person's base line or start up is equally important and significant, and it's frequently taken seriously to avoid mistakes that might not be readily rectified.

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Given Data:

Frequency of radiation = 6.00 x [tex]10^{15}[/tex] Hz

The relationship between frequency and wavelength is expressed by the formula , c = λν, where λ is the wavelength of the radiation,

ν is the frequency of the radiation, c is the velocity of light in free space.

c =3 x  [tex]10^{8}[/tex] m/s , ν = 6.00 x [tex]10^{15}[/tex] Hz

Then , wavelength of the radiation is , λ = [tex]\frac{c}{v}[/tex] =   [tex]\frac{3X10^{8} }{6X10^{15} }[/tex]  = 0.5 x [tex]10^{-7}[/tex] m

                                                                                        = 50 nm.

Hence, the radiation with a frequency will have a wavelength  of 50 x [tex]10^{-9}[/tex]  m = 50 nm.

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The correct option is option d 1.24

What is dipole moment?

A dipole moment forms in any system where the charges are dispersed. A dipole moment could be created by both covalent and ionic bonding. The development of the dipole moments is caused by the difference in electronegativity. Electronegativity describes the chemical bonding between these two atoms.

A bond dipole moment measures the polarity between two atoms in a molecule. Bond dipole and the concept of electric dipole moment are connected. It evaluates how effectively a system separates positive and negative charges. The bond dipole moment has magnitude and direction because it is a vector quantity.

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By using the specific heat capacity of water, the temperature of the water in the cup is found to reach 38.5℃ assuming the cup absorbs negligible heat as it is a perfect insulator.

The specific heat capacity of a substance is defined as the amount of heat (J) absorbed per unit mass (kg) when its temperature rises 1 K (or 1 °C).

The specific heat capacity of a solid is determined by its mass, temperature change, and solid nature.

Specific heat capacity is useful in calculating processing temperatures and the amount of heat required for processing, as well as in distinguishing between two polymeric composite materials.

No. of moles of CaO available = 10.1 / 56 = 0.18 mol

Since 1 mol reactant supplies 64.8 kJ, thus 0.18 mol gives = 11.69 kJ

Therefore, we have 11.69 kJ heat available

Now,

ΔH = mCΔT

where,

ΔH = heat supplied

C = specific heat

ΔT = rise in temperature

Therefore,

ΔT = ΔH/mC = 17.8

Thus,

Final temperature = 18 + 17.8 = 35.8℃

Result:

Hence, (B) 35.8℃ is the temperature of the water in the cup.

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The molarity of phosphoric acid in a solution labelled 20% of Phosphoric acid by weight and a density of 1.12g/mL is 11.85 mol/L.

What is molarity?

The number of moles of solute divided by the number of liters of solution is the definition of molarity, a concentration unit in chemistry. Molarity is measured in moles per liter (mol/L).

Number of moles of phosphoric acid whose molar mass is 98:

[tex]Number of moles = \frac{mass}{molar mass}[/tex]

n = 20/98

n = 0.204 mols

[tex]Volume = \frac{mass}{density }[/tex]

V = 20/1.22

V = 17.85 ml

Molarity is the number of moles of solute per liter of solution.

[tex]M = \frac{n}{V}[/tex]

Where, M = molarity, V = volume of solvent in liters, n = no. of moles of solute.

So, [tex]M = \frac{0.204}{17.85} \times \frac{1000}{1}[/tex]

M = 11.85 mol/L

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We can see that the reaction is endothermic hence it would be shifted to the left by;

1) Decreasing the concentration of ammonia

2) Increasing the pressure of the system

We know that the position of the equilibrium could be affected when the parameters of the reaction are altered. Thus we often say in chemistry that when a constraint is imposed on a system that has already attained equilibrium, then the system must have undergo a through readjustment of itself so that it could be able to annul the constraint.

Let us note that that we want the equilibrium position to move to the left in this case and have more products.

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There are many applications for hydrochloric acid. It is used for the production of chlorides, fertilizers and dyes, as well as in galvanic plating and in the photographic, textile and rubber industries.

Eyes, skin and mucous membranes are corroded by hydrochloric acid. In humans, acute (short-term) inhalation exposure may cause eye, nose, and respiratory tract irritation, as well as inflammation and pulmonary edema. Acute oral exposure can cause mucosal, esophageal, and stomach burns, and dermal contact can cause severe burns, ulceration, and scarring in humans. Gastritis, chronic bronchitis, dermatitis, and photosensitization have all been associated with chronic (long-term) exposure to hydrochloric acid. Long-term exposure to low concentrations can also cause tooth discoloration and erosion. Hydrochloric acid has not been classified as a carcinogen by the EPA.

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Answer: 80000 micrometers

hope i helped

The moles of ions present in the solution when a solution is prepared by dissolving 0.69 mol of mgcl2 in 0.40 kg of water is 2.0 moles.

0.69 moles of MgCl2 in 0.4 kg water

MgCl2 disassociates as Mg2+ + 2Cl-

So 1 MgCl2 from 3 moles

Moles of ion present is 3x0.69=2.0 moles

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