also known asa toxic heavy metal , the lead in some paints is an example ofhazardous waste. why?

Well here i can't provide the diagram of the starting material is a 6 C ring where C 1 has a wedged bond to bromide (Br) and a dashed bond to hydrogen. moving counterclockwise, C 2 has a wedged bond to methyl and a dashed bond to hydrogen. this reacts with c h 3 o n a and methanol to form the product.

Bromide is the negatively charged member of the halogen group and is a form of Bromine element. Bromine's atomic no is 35 and atomic mass is 79.904 u.

Methanol is first of all is a organic chemical with the formula CH₃OH. It is an aliphatic alcohol which is colorless and volatile in nature.

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The compounds MgO, NaF, and RbI are organized in ascending order of lattice energy.

Smaller ions have bigger charges, which results in more lattice energy. thus possesses the highest lattice energy.

Radius of the ions has an inverse relationship with lattice energy. Magnesium ions are smaller than calcium ions in size. As a result, lithium fluoride has the lowest lattice energy and magnesium oxide has the greatest.

Lattice energy increases for ions with higher charges and shorter distances between ions. Lattice energies are often calculated using the Born-Haber cycle, a thermochemical cycle including all of the energetic steps involved in converting elements into an ionic

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two gases are in a sealed 3.17 l flask. if you have 17.81 grams of ne and 18.81 grams of ar,  the mole fraction of ar is 45.76

molar mass of ne = 20.18/mole

17.81 / 20.18 = 0.882 moles

molar mass of ar = 39.948/mole

18.81 / 39.948 = 0.470 moles

molar fraction of Ar = 39.948 / 0.882 + 0.470

                                = 45.76

Consider a solution that consists of two substances A and B, then the mole fraction of each substance is:Mole fraction of solute =  (Moles of Solute) / (Total number of moles of the solutes and the solvent).= XA = (mol A) / ( mol A + mol B)And= XB = (mol B) / ( mol A + mol B).

Because it is temperature independent, it is not affected by changes in temperature. In the case of the mole fraction, it is not required to be aware of the densities of the relevant phases. A mixture with a known mole fraction can be made by subtracting the actual masses of the elements from the total weight. The measure is symmetrical, therefore the roles of "solvent" and "solute" are switched in the mole fractions where x = 0.1 and x = 0.9. A component's mole fraction in a ternary mixture can be stated as a function of the binary mole ratios and mole fractions of the other components.

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So the formula is C2H4, hydrocarbon gas is 81.7% c and the rest hydrogen by mass. at a temperature of 25°c and a pressure of 1atm, 1.28 g of this gas occupies 0.714 l.

Purely made of carbon and hydrogen, hydrocarbons are by far the most prevalent substance in crude oil, refined petroleum hydrocarbons (such as gasoline, diesel, kerosene, fuel oil, and lubricating oil), coal tar, creosote, dyestuff, and pyrolysis waste products. The most fundamental class of organic molecules are referred to as hydrocarbons. They only contain the two elements hydrogen and carbon, as implied by their name. In a branching or chain-like arrangement, hydrogen atoms surround one or more central carbon atoms in hydrocarbon molecule.

Carbon : Hydrogen mole ratio =  12

85.7 :14.3= 7 : 14 = 1 : 2

Empirical formula = C H  : empirical formula wt = 14

Given 1 litre at NTP weighs 1.26 g

Therefore 22.4 litres will weigh  = 28 g

n =  14, so the formula is C2H4

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​

The following assertion is true , If there are several suppliers or customers, the solution for the bounded buffer problems mentioned in section 7. 1. 1 will not function properly.

A mixture is any mixture in which one or more solutes have been broken down by a solvent. Solutes must dissolve in solvents to form homogeneous mixtures. Solutes must dissolve in solvents to form homogeneous mixtures.

Types such solution include sugar-water, salt solutions, metal, alloy, alcohol in water, aerosols, air, and aerated beverages like Coca-Cola. When working with chemicals, we frequently make a variety of solutions, such copper in water and iodine in alcohol, among others.

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At room temperature, a chunk of dry ice, which is solid CO2, eventually disappears. No liquid puddle is present. The CO2 gas froze solid.

Dry ice is created when carbon dioxide freezes. Instead of first becoming a liquid and then a solid, carbon dioxide transitions directly from a gas to a solid. Because of this, anytime it melts, gas is also produced.

What does dry ice actually serve for?

Dry ice is typically used in industry for operations including blasting, maintaining frozen items, and conveying medications. Additionally, we regularly use dry ice for a number of additional purposes, such as creating spectacular effects for films and events.

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1.57g of iron(iii) oxide will be produced.

What do you mean by ideal gas equation?

The Ideal gas law is the equation of state of a hypothetical ideal gas. It is a good approximation to the behaviour of many gases under many conditions, although it has several limitations. The ideal gas equation can be written as

PV = nRT

Where,

P is the pressure of the ideal gas.

V is the volume of the ideal gas.

n is the amount of ideal gas measured in terms of moles.

R is the universal gas constant.

T is the temperature.

V = 6.50 L

T = 50.2 degree celsius = 50.2 + 273.15 K = 323.35 K

P = 0.121 atm

Using ideal gas equation,

n = PV/ RT = 0.121 atm* 6.50 L / 0.0821 * 323.35 K = 0.0296 mol

0.0296 mol of H20* 1mol Fe2O3 / 3mol H2O * 159.69g of Fe2O3/1 mol Fe2O3= 1.57g

So, 1.57g of iron(iii) oxide will be produced.

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Among hydrogen, nitrogen, oxygen and chlorine gas particles, hydrogen has  the smallest particles  will move with the fastest speed.

The formula of kinetic energy is :

KE= 1/2 (Mv^2)

Where, KE = kinetic energy

m = mass of the gas particle

v = velocity of the gas

Different gas particles move at different speeds with this kinetic energy—gases with smaller particles tend to be moving faster at the same temperature, which means they have a higher speed.

Among hydrogen, nitrogen, oxygen and chlorine gas particles, Chas  the smallest particles  will move with the fastest speed.

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When sodium carbonate and magnesium chloride are mixed in aqueous solutions, the spectator ions are No3- and Na+.

Salt and chloride are the spectator ions. The only insoluble component in this reaction is magnesium carbonate. Both water and a gas compound are not created. This indicates that all other ions are spectator ions and remain in aqueous solutions on both sides of the reaction equation.

Magnesium carbonate and sodium chloride are created when sodium carbonate, Na 2CO 3, and magnesium chloride, MgCl 2, react.

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Answer:

1.9 x 10^-20 Joules

Explanation:

I'll assume the frequency is 2.9 x 10^13 Hz  [5-1 was meant to be s^-1].

The energy of a photon is given by the releationship:

 E = hf, where E is energy, h is Planck's constant, and f is frequency, in 1/s or Hz.

Planck's constant = 6.62607E-34 J*s

E = hf

E = (6.626 x 10^-34 J*s)*(2.9 x 10^13 s^-1)

E = 1.9 x 10^-20 Joules

The volume of the balloon if 0.25 moles of gas are released is 1.3L.

Solution:

[tex]\frac{1.75L}{3.50mol} = \frac{V_{2} }{2.6 moles}[/tex]

V₂ = 1.75 L * 2.6 moles/3.50 moles

= 1.3L

If the temperature and pressure are kept constant, the volume of the gas is directly proportional to the number of gas molecules. At constant temperature and volume, the pressure of a gas is directly proportional to the number of gas molecules present. As the balloon heats up, it expands and the air inside the balloon becomes less dense.

The volume and temperature kept changing so that the pressure remained constant. If the temperature is kept constant, the volume of a given amount of gas is inversely proportional to its pressure. Under the same conditions of temperature and pressure, the same volume of all gases contains the same number of molecules.

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For a cell made up of cu(s) in 0.03 m cu(no3)2(aq) and cu(s) in 1.49 m cu, the value of ecell in v (assuming 298k) is 2.0 V. (no3) 2(aq)

What is the process of a solar cell?

Galvanic (or voltaic) cells generate an electric current via a thermodynamically advantageous redox reaction. In a separate compartment, or half-cell, each half-reaction takes place alongside an electrode. The electrodes where oxidation and reduction happen are called the anode and cathode, respectively.

What sets voltaic cells apart from galvanic ones?

Galvanic (or voltaic) cells use a thermodynamically advantageous redox reaction to produce an electric current. Each half-reaction takes place next to an electrode in a distinct compartment, or half-cell. The anode and cathode, respectively, are the electrodes where reduction and oxidation occur.

Briefing:

For the oxidation half cell;

Al(s) -------> Al^3+(aq) + 3e.

For reduction half cell;

Cu^2+(aq) +2e ------> Cu(s).

E°cell = E°cathode - E°anode

But;

E°cathode= 0.34 V

E°anode = -1.66 V

E°cell= 0.34 -(-1.66)

E°cell= 2.0 V

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At  50.14 k a substance has a vapor pressure of 258.9 torr. its heat of vaporization in kJ/mol it if has a vapor pressure of 161.2 torr at 277.5 k is

given that :

temperature T1 = 50.14 K

pressure P1 = 258.9 torr

temperature T2 = 277.5 K

pressure P2 =  161.2 torr

using the Clausius Clapeyron , we get :

ln ( P1 / P2 ) = - ΔH / R (1/ T1 - 1/T2)

ln ( 258.9 / 161.2 ) = -   ΔH / 8.314 ( 1/ 50.14 - 1 / 277.5 )

ΔH = 41.83 kJ/ mol

The heat of vaporization ΔH = 41.83 kJ/ mol.

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The atomic number of indium is 49, and its electronic configuration is [Kr] 4d105s25p1. This atom is a member of the element that belongs to groups 13 and 5. The luster of indium is bright silvery-white.

The least energetic and most stable configuration is the ground state configuration. A higher energy configuration is called an excited state configuration (it requires energy input to create an excited state). The electrons used in bonds are valence electrons.

The electrons in an atom's outermost shell, or energy level, are called valence electrons. oxygen has 6 valence electrons two in the 2s subshell and four in the 2p subshell. The electron configuration of oxygen can be expressed as 2s22p4.

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Using the ideal gas equation, the number of mole of O₂ is 2.83 mol.

PV = nRT is the formula for the ideal gas equation. In this equation, P denotes the ideal gas's pressure, V the volume of the ideal gas, n the total amount of ideal gas measured in moles, R the universal gas constant, and T the temperature.

The reaction becomes:

4 FeS (s) + 7O₂ (g) → 2Fe₂O₃ (s) + 4SO₂ (g) .

Volume of O₂ = 27.2 L .

Pressure = 3.86 atm.

Temperature = 452 K .

We have to calculate what mass of Fe₂O₃ will be produced from the given starting material.

We know that,

According to Ideal gas law,

PV = nRT

Where ,

P is pressure

V is volume

n is number of mole.

R is gas constant.

T is temperature.

Now putting the values,

3.86 atm x 27.2 L = n x (0.0821 L.atm/ mol.K) x 452 K

n = 2.83 mol.

So the number of mole of O₂ is 2.83 mol.

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The Products are the chemicals that emerge from the process.

What is chemical reaction?

A method where one or more substances, known as reactants, are transformed into one or more new substances, known as products. Substances are made of chemical building blocks or chemical compounds.

What is solid ?

As one of the four fundamental states of matter, a substance is said to be in the solid state when it is in that condition. Atoms in solids are closely packed together and have significantly lower kinetic energy than those in liquids and gases.

Chemical reactions are initiated by reactants, which are the substances that do so. Products are the chemicals that emerge from the process.

Therefore, Products are the chemicals that emerge from the process.

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The final temperature is less than 30 degrees.

Mass, in physics, quantitative measure of inertia, an essential property of all dependents. It's far, in effect, the resistance that a frame of count number gives to a change in its speed or position upon the application of pressure. The more the mass of a frame, the smaller the alternate produced with the aid of a carried-out force.

The unit of mass within the worldwide machine of gadgets (SI) is the kilogram, which is defined in terms of Planck's regular, which is described as equal to 6.62607015 × 10−34 joule 2d squared.

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Explanation:

RFM=98g

1mol=6.022x10^23molecules

1mol=RFM

98g H2SO4=6.022x10^23molecules

24.0g H2SO4=?

24×6.022×10^23/98

=1.475×10^23 molecules

Molecular solid have covalently bonded atoms in it whereas Ionic solid have electronic bonds between its atoms..

We employ the octet rule, which states that all atoms in a compound are expected to comply by, to confirm the accuracy of any chemical structure. Every atom in the carbon IV oxide model precisely complies with the octet rule. The valence shell of each atom in the molecule is surrounded by eight electrons. We can therefore conclude that this structure is accurate given the total number of bonds and electrons, as well as the fact that CO₂ has sixteen valence electrons.

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In an acid-base titration, an indicator is typically used to indicate the endpoint of the titration.

An indicator is a chemical that changes color when a certain pH is reached, usually near the equivalence point of the titration. Common indicators used in acid-base titrations include phenolphthalein, methyl orange, and bromophenol blue.

The indicator is typically added to the analyte solution at the beginning of the titration. When the titrant is added to the analyte, the pH of the solution will gradually increase.

When the amount of titrant added is equal to the amount of analyte, the solution will be neutralized, and the endpoint of the titration (the equivalence point) will be reached. At this point, the indicator will change color, indicating that the titration is complete.

The color change indicates the end point of the titration, and the amount of titrant added is equal to the amount of analyte.

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Molecules behave like soap and clean away dirt by:

What kind of molecule is a detergent?

Detergents are amphipathic molecules that contain polar or charged hydrophilic groups (heads) at the end of long lipophilic hydrocarbon groups (tails) (Figure 1). They are also known as surfactants because they decrease the surface tension of water.

Why is detergent more effective than soap?

A soap contains a COO− group, which is capable of dispersing the attractive forces between water molecules, known as "surface tension", but will not be able to do this indefinitely. Detergents on the other hand contain an O−SO3− group with the same ions which can hold this force at bay.

What are the properties of detergent?

Detergents are products containing soap or other surfactants with surfactant properties: wetting property, emulsion (foam), breaking bonds between the dirt and its holder.

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 T= 81.960C is the final temperature when the two become equal.a 45-g aluminum spoon (specific heat 0.88 j/g °c) at 24 °c is placed in 180 ml (180 g) of water at 85 °c and the temperature of the two become equal. specific heat of water is 4.184 j/g°c.

Natural environments do not contain pure aluminium. Beginning with bauxite ore, which is made up of hydrated aluminum oxide (40% to 60%) combined with silica and iron oxide, the manufacturing of primary aluminum metal can begin. For every 4 to 5 tonnes of bauxite ore, 2 tonnes of alumina are produced. Aluminum corrodes even if it doesn't rust. The metal is kept largely protected from corrosion by the aluminum oxide coating's high resistance and ability to repair itself after injury. It is well known for being both lightweight and flexible, making aluminum a very versatile metal with many benefits. built to accommodate a wide range of uses.We Know that Q= heat  = mCp\DeltaT

where m= mass, Cp = heat capacity, \DeltaT = temperature difference      The heat lost by hot fluid = heat gained by cold fluid

       mhCph\DeltaT = mcCpc\DeltaT

where h and c denote hot(coffee)and cold(aluminium spoon) respectively. Heat capacity of water = 4.2 J(mole*K)= heat capacity of coffee(given), On substituting all the given terms:

           180*4.2*(85-T) = 45*0.88*(T-24)

On Solving,                    T= 81.960C

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Ans1. Left electrode will be positive because in concentration cell electron moves from lower concentration to higher concentration. Hence right electrode will act as anode and will be negative. Left one will act as cathode and will be positive.

Ans2. For Concentration cell,

Ecell =\frac{-0.0591}{1}\log \frac{0.2}{2}   (Since, it involves one electron)  

= +0.059 V

~ 60 mV.

A conductor used to make electrical contact with a circuit's nonmetallic components is called an electrode. In electrochemical cells, semiconductors like diodes, and medical equipment, electrode are frequently utilized (see Figure 1). Transfer of electrons takes place at the electrode.

Percentage of concentration: It represents how much solute dissolves in 100 g of solvent. If a solution's concentration is 20%, we know that there are 20 g of solute in every 100 g of solution. As an illustration, a solution is made by mixing 10 g of salt and 70 g of water. by % mass, determine the solution's concentration.

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Each of the unscrambled terminologies in italics should be used to complete the sentences as follows;

In Science, a chemical reaction can be defined as a chemical process that involves the continuous transformation and rearrangement of the ionic, atomic or molecular structure of a chemical element by breaking down and forming chemical bonds, in order to produce a new chemical compound while new bonds are formed.

Based on changes in chemical structure, there are five (5) main types of chemical reaction and these include the following;

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For modest atomic masses, the atom's recoil plays a more significant role. Which two atoms in these molecules would be interconnected if liquid ammonia and water were combined?

What is a hydrogen bond, for instance?

Hydrogen, for instance, is covalently linked to the more electronegative oxygen atom in water molecules (H2O). Therefore, the dipole-dipole interactions between the hydrogen atom of one water molecule and the oxygen atom of another H2O molecule are what cause hydrogen bonding to form in water molecules.

What exactly does the term "hydrogen bond" mean?

The partial positive charge of the hydrogen atoms in some polar molecules causes them to be drawn to the partial negative charge of an atom in another neighboring molecule. A hydrogen bond is the name given to this attraction.

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The compound B is 3,3-dimethyl-1-butyne, and the compound C is 4,4-dimethyl-2-pentyne.

Alkynes are hydrocarbons that have triple bonds between carbon atoms. CₙH₍₂ₙ₋₂₎ is the typical formula for molecules with one triple bond. Alkynes undergo many of the same reactions as alkenes, but because a triple bond contains two p-bonds, they can react twice.

Here, compound B with the molecular formula C₆H₁₀ is 3,3-dimethyl-1-butyne and compound C is 4,4-dimethyl-2-pentyne. The compound B reacts with sodium amide (NaNH₂) and methyl iodide (CH₃I), giving the compound C. This reaction explains the acidity of non-terminal alkynes.

In this reaction, sodium amide first abstracts the protons from carbon atoms near the triple bond. The resulting carbanions undergo rapid proton transfer equilibria to form a stable terminal alkyne conjugate base.

The reaction is attached.

The complete question is -

Identify the compounds B and C. Compound B has molecular formula C₆H₁₀ and gives (CH₃)₂CHCH₂CH₂CH₃ when treated with excess H₂ in the presence of Pd. B reacts with NaNH₂ and CH₃I to form compound C (molecular formula C₇H₁₂).

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The limiting reagent in all the three mixtures a, b and c is Iron.

Iron and Oxygen reacts with each other to form iron (III) as follows,

4Fe(s) + 3O₂(g) → 2Fe₂O₃(s)

So, as we can see,

4 moles of Fe reacts with  moles of O₂ to form iron(III) oxide.

So, for every 1 mole of Fe, 3/4 moles of O₂ will required.

Also,

Moles = Given mass/Molar Mass

Molar mass of Fe = 55 g/mol.

Molar mass of Oxygen = 16 g/mol.

a). In mixture of 2.0 mol of Fe and 6.0 mol of O₂,

There are 3 moles of O₂ are present for every one mole of Fe.

So, Fe is the limiting reagent here.

b) In mixture of 5.0 mol of Fe and 4.0 mol of O₂,

4/5 moles of O₂ are present for one mole of O₂.

So, the limiting reagent in this case is Iron.

c) In mixture of 16.0 mol of Fe and 20.0 mol of O₂,

There are 16/20 moles of O₂ are present for one mole of Iron.

So, the Limiting reagent in this case is Iron.

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0.375 L of gas are produced if 1.00 g. of nahco3 decomposes at 29 degrees c and 769 torr

From the question, we have

moles=0.011

p=769 torr

v=?

temperature=302K

PV=nRT

V=nRT/P

V=0.11×8.3×302÷769

V=0.375 L

Volume :

The area occupied within an object's limits determines its volume in three dimensions. On occasion, it is referred to as the object's capacity. The volume of an object can be used to calculate how much is needed to fill it; for instance, how much water is needed to fill a bottle, aquarium, or water tank. A sphere is the most basic and prevalent type of three-dimensional shape. We come with spheres all the time in the form of balls, globes, ornamental lights, oranges, etc.

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Answer: Growth Hormones.

The  statements that is incorrect about a concentration cell consisting of the same metal and metal ion solutions at different concentrations is the cell containing the more concentrated solution is the anode.

So option B is correct.

A metal ion solution or aqua ion is described as a cation, dissolved in water, of chemical formula [Mₙ]ᶻ⁺. The solvation number, n, determined by a variety of experimental methods is 4 for Li⁺ and Be²⁺ and 6 for most elements in periods 3 and 4 of the periodic table.

A concentration cell is also described as a limited form of a galvanic cell that has two equivalent half-cells of the same composition differing only in concentrations. A spontaneous redox reaction occurs in a concentration cell until the concentrations of the solutions become equal.

The cell containing the more concentrated solution is the cathode while the cell containing the less concentrated solution is the anode.

Also, the standard electrode potential (e°) of the electrochemical cell is zero.

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