What is a solubility curve and what does it measure?

Answer:

The answer is Inference.

1s²2s²2p⁷3s²3p⁴ two of the following electronic configurations (in quantum mechanical notation) are not reasonable.

The correct option is B.

Using subshell labels, the electronic structure of an atom is described. These labels include the subshell name, which is determined by the azimuth and elevation quantum number, the shell number, which is determined by the main quantum number, and the total quantity of electrons in the subshell, which is indicated in superscript.

An atom's electron configuration describes how its electrons are dispersed across its orbits (shells) and subshells. An atom's electron configuration is crucial because it aids in predicting a substance's chemical, physiological, electrical, and magnetic characteristics.

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Answer: 2

Explanation: For the equation to be balanced, the elements or compounds from the reactant and product sides must be equal.

Everything else was equal except the Na and Cl which on the reactant side it had 2 molecules each and on the product side 1 molecule.  

All you have to do is add 2 Infront of NaCl on the product side to make the reaction balance.

The rate constant increase by the factor of 4 when temperature is increased from 25C to 37C and activation energy is 85.6KJ. This can be solved using Arrhenius equation.

What is Arrhenius equation?

Arrhenius equation explains the relation between temperature and rate of the reaction for many chemical and physical reactions. It is given by,

k = A x e^(-Ea/RT)

where k = rate of the reaction, Ea = activation energy, R = gas constant, T = temperature.

The increase in the rate of the reaction can be calculated by Arrhenius reaction when the 2 different temperatures are given.

log k2/k1 = Ea / 2.303R [T2-T1 / T2T1] = 85.6 / 2.303 x 8.314 [ 310 - 298 / 310 x 298] = 4.

Therefore, by using Arrhenius equation, the increase in the rate of the reaction when the temperature increased from 25C to 37C is by a factor of 4.

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The half life of the radioactive isotope is 25 million years.

The half life of the substance - The half life of the substance is the time taken by the substance to decay to its half concentration of the initial value.

All the radioactive reaction follows first order kinetics,

So, it means that,

If in 200 million years, only 1/16 of the original amount of the radio active atoms in a sample.

It means before 100 million years, the amount of the radioactive atoms were 1/8.

similarly, 50 million years, the amount of the radio active atoms were 1/4.

Continuing the pattern, 25 million years, the amount of the radio active atoms were 1/2.

So, after 25 million years, the amount of radioactive atoms in the sample left are 1/2 of the original amount.

So, the half life of the sample is 25 million years.

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1. The bacterial cell shown is a prokaryotic cell.

2a. The similarities between prokaryotic and eukaryotic cells include:

2b. The differences between prokaryotic and eukaryotic cells include:

Eukaryotic cells are cells that possess a membrane-bound nucleus as well as membrane-bound cell organelles.

Eukaryotic cells are cells of higher organisms such as animals and plants.

Prokaryotic cells are cells that lack a membrane-bound nucleus as well as membrane-bound cell organelles.

Prokaryotic cells are cells of lower organisms such as bacteria.

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Metals will tend to form ions that are larger than their parent atom.

Do metals become smaller or larger when they become ions?

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Initially, the Flack is the flask filled with water and weighed to find may of water + flask Afla that the Flask is empty flack in noted. emptied and mars ofMass of water in the beaker. calculated by is mars of the flask from. subtracting from this volume of a mass of water + flask.

Flask is calculated using the standard density of water at that ten pleasure. If the flask is not a day from outside at that time, the mass of water will be More than the actual. This results. the higher calculated volume of the flask. As Molar mass. M- MRT PV mass of volatile where Mina's liquid.

Analysis of total nitrogen in organic matrices can be performed using the Dumas method. This ensures the complete combustion of the matrix under oxygen. The resulting gas is reduced with copper and dried with CO2 trapped. Next, quantify nitrogen using a universal detector. Use a thin glass flask with a long neck.

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Using the ideal gas equation, the volume of the gas is  0.84 L.

We know that an antacid does react with the acid in the stomach and that one of the products of the reaction is the carbon dioxide gas as we can see from the reaction equation; CaCO₃ (s) + 2 HCl (aq) → CaCl₂ (aq) + H₂O (l) + CO₂ (g).

If 1 mole antacid molecule produces one mole of carbon dioxide;

Number of moles of antacid = 3.32 g/100 g/mol = 0.0332 moles

Volume of the gas = ?

Number of moles of the gas =  0.0332 moles

Temperature of the gas = 37.0 °C + 273 = 310 K

Pressure of the gas =  1.00 atm

Given that;

PV = nRT

P = pressure

V = volume

n = Number of moles

R = gas constant

T = temperature

V= nRT/P

V =  0.0332  * 0.082 * 310/1.00 atm

V = 0.84/1

V =  0.84 L

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The total outer atoms present in a molecule with planar shape are four and total lone pairs are 2.

Square planar shape is formed when there are four bonds and two lone pairs on the central atom.

The four atoms that are attached to the central atom are known as the four outer atoms. These atoms are arranged in such a way that it makes the square shape. The outer atoms are not always fours. They can be 2,3 or four.

The lone pairs are present on the central atom.

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The solid Aluminium Nitrate is added to distilled water to produce the solution, the concentration of Aluminium ions in the solution is 0.20 M

The Solid Aluminium Nitrate Al[NO₃]₃ consists of a ratio of 1 Aluminium ion consisting of 3 Nitrate ions per formula unit.

Thus, the concentration of [NO₃]³⁻ is given as 0.60M

1 [Al]³⁺  →  3[NO₃]

∴ 1 [Al]³⁺ → 1/3 × 0.60

1 [Al]³⁺ → 0.20 M

Hence, the concentration of aluminum ions in the solution is 0.20 M.

The Aluminium Nitrate appears to be a white, crystalline solid. Though it is a non-combustible compound but can accelerate the burning of combustible materials. In large quantities, it could lead to explosions.

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C2HBrClF3 and O2 have partial pressures of 84 torr and 778 torr, respectively.

Given,

C2HBrClF3 mass = 15.0 g

O2 mass is 22.6 g.

C2HBrClF3's molar mass is 197.4 g/mole.

O2's molar mass is 32 g per mole.

Raoult's Rule

Xsolvent = Psolution

P0solvent

P solution is the solution's vapour pressure.

"solvent" is the solvent's mole fraction.

P0solvent = the pure solvent's vapour pressure

Raoult's Law-

Raoult's law states that the partial vapour pressure of a solvent in a solution (or mixture) is equal to or the same as the pure solvent's vapour pressure times the mole fraction of the solvent in the solution.

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The final temperature after mixing these solutions will be 311K.

This can be calculated using formula:

q = m⋅c⋅(change in temperature)

−q (lost) = q (gained)

This is equivalent to

−50.0g⋅ (T−330)K = 30.0g⋅ (T-280)K

−50⋅T+16500 =30⋅T−8400

80.0⋅T = 24900

T = 311.25 K

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Answer:

1.12 x 10⁻⁵ grams H₂O

Explanation:

To find the mass of water, you need to use the following equation:

Q = mcΔT

In this equation,

-----> Q = heat (J)

-----> m = mass (g)

-----> c = specific heat capacity (J/g°C)

-----> ΔT = T₂ - T₁ = change in temperature (°C)

"T₁" represents the initial temperature and "T₂" represents the final temperature. The specific heat capacity of water is 4.186 J/g°C. Before plugging the variables into the equation and solving for "m", you need to convert the energy from kilojoules (kJ) to joules (J).

1,000 kJ = 1 J

Q = 2.19 kJ / 1,000 = 0.00219 J         c = 4.186 J/g°C

m = ? g                                                 ΔT = 74.5°C - 28.0°C = 46.5°C

Q = mcΔT                                                   <----- Given equation

0.00219 J = m(4.186 J/g°C)(46.5°C)          <----- Insert variables

0.00219 J = m(194.649)                             <----- Multiply 4.186 and 46.5

1.12 x 10⁻⁵ = m                                            <----- Divide both sides by 194.649

11.25 grams of water can be heated from 28.0°C to 74.5°C when 2.19 kJ of heat is absorbed.

The specific heat is the amount of heat per unit mass required to raise the temperature by one degree Celsius.

It is a measure of how much energy it takes to raise the temperature of a substance. It is the amount of heat necessary to raise one mass unit of that substance by one temperature unit.

It is given by the formula -

                                                  Q = mcΔT

where, Q = amount of heat

m = mass

c = specific heat

ΔT = Change in temperature

Given,

Amount of heat = 2.19kJ

Initial Temperature = 28

Final Temperature = 74.5

Q = mcΔT

2190 = m × 4.18 × ( 74.5 - 28 )

m = 11.25 g

Therefore, 11.25 grams of water can be heated from 28.0°C to 74.5°C when 2.19 kJ of heat is absorbed.

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Viscosity of polystyrene is determined to know the size of polystyrene its compression, and molding capacity.

To obtain the perfect shape and size the configuration of polystyrene should be maintained under different conditions.

So, to deduce the confirmation of the polystyrene under viscosity determination  we can apply 2 methods;

1. By adding excess diluents to the polystyrene which reduces its viscosity.

2. By introducing or adding small linear chains by addition method to the molecular chains of polystyrene molecular structure to reduce chain entanglement.

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Chemists employ the mole, a very significant unit of measurement. The initial SO3 concentration is 0.28 M.

A mole is defined as 6.02214076 1023 of a particular chemical unit, such as atoms, molecules, ions, or others. Because there are so many atoms, molecules, or other components in any compound, the mole is a useful quantity to utilize.

When an element's standard relative atomic mass is multiplied by the molar mass constant, 1 103 kg/mol = 1 g/mol, the result is the molar mass of its atoms.

An object's mass that comprises 6.023 x 1023 of that object's particles is referred to as a mole. The SI unit used to measure substance amounts is the mole. Molecule is its symbol. According to the definition, 1 mole of carbon-12 weighs 12 grams and has a carbon atom count of 6.022140857 x 1023.

2.50 L is the container's volume.

Initially, there were 0.700 moles.

first concentration of SO3 =0.700 moles /2.50 L

SO3 = 0.28 M

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The Equilibrium concentrations :

[XY]  = 0.268 M

[X] = 0.232 M

[Y]  = 0.232 M

Solution:

XY  ⇔ X + Y

0.2 + x                        0.3-x      0.3 - x

Kc  = [X][Y]/[XY]

0.200  = (0.3-x)^2 / 0.2 + x

0.04  + 0.2 x = 0.09  + x^2 - 0.6 x

x^2   - 0.8 x + 0.05 = 0

x   = 0.732  or x = 0.0683

Equilibrium concentrations :

[XY]  = 0.268 M

[X] = 0.232 M

[Y]  = 0.232 M

When both the reactants and products are at concentrations that do not change over time, they are said to be in chemical equilibrium. In this state, the forward reaction rate is equal to the reverse reaction rate. A chemical is said to have equilibrium concentrations when the products and reactants do not change with time.

In other words, chemical equilibrium or equilibrium concentration is the state in which the rate of the forward reaction in a chemical reaction equals the rate of the reverse reaction. Equilibrium is when the rate of the forward reaction equals the rate of the reverse reaction. All extract and product concentrations are constant at equilibrium.

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2 liters of chlorine gas react to produce 2 l of hydrogen chloride gas

We may think about STP.

Gaseous hydrogen chloride in 2 L

PV = nRT

P = 1 atm

V = 2L

n = ?

R = Gas Constant, or 0.0821 L atm K-1 Mol-1.

T = 273

enter and find n in the equation

1 x 2 = n x 0.0821 x 273

n = 08923 mole

An comparable amount of Cl2 gas is required for every 0.08923 mole of hydrogen chloride gas (0.08923 = 0.044615 mole).

as a result, volume of 0.044615 mole of Cl2

P = 1 atm V =?n = 0.044615" T = 273

1 x V = 0.044615 x 0.0821 x 273

V = 1 Lit

Hence Chlorine gas must react to create hydrogen chloride gas, which requires a reaction volume of 2 L.

provide the same amount of 2 Liter

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Polyvinyl chloride (PVC) is mostly used for cable jackets.

PVC cable jackets can withstand heat, sunlight, weathering, oils, acid, and physical abrasion, making them an excellent choice for outdoor cable jackets. It is a thermoplastic material.

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The normal combustion of 8.76 g of glycine produces 28.1 kcal while the combustion in the body produces  18.96 kcal.

We know that a combustion reaction is one in which an object is burnt in oxygen. In this case, we have the reaction in which the amino acid is burnt both in oxygen (normal combustion) and the burning of glycine in the body also occurs.

In this case, we have the number of moles of the glycine that has participated in the reaction is; 8.76 g/75 g/mol = 0.12 moles

In the reaction that occurs  by normal combustion;

4 moles of glycine produces 936 kcal of energy

0.12 moles of glycine produces 0.12 moles * 936 kcal/4 moles

= 28.1 kcal

In the reaction that occurs in the body';

2 moles of glycine produces 316 kcal

0.12 moles of glycine produces 0.12 moles * 316 kcal/2 moles

= 18.96 kcal

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Empirical formula of the anhydrous salt is  CuSiF₆

The formula of the hydrate is CuSiF₆.6H₂O

The molecular formula of a compound is the simplest integer ratio of the atoms present in the compound. As a simple example of this concept, the empirical formula for sulfur monoxide (SO) is simply SO, as is the empirical formula for Di-sulfur dioxide S₂O₂

Consider mass of Cu = 30.9 g

mass of Si = 13.6 g

mass of F = 55.5 g

Now for empirical formula, let's calculate the moles of each element:

Moles of Cu = 30.9/63.5=.49 moles

Moles of Si = 13.6/28.0=.49 moles

Moles of F = 55.5/19=2.92 moles

As you can see the moles of Cu and Si are almost 6 times the moles of F, which result in the empirical formula of salt as;  CuSiF₆

Now, for the formula of  hydrate:

Moles of CuSiF₆ = 1/205.62

= 0 .00486 moles

weight of H₂O = 1.53-1

= 0.53 g

Moles of H₂O = .53/18

= 0.029 moles

CuSiF₆ : H₂O = 0.00486 : 0.029

= 0.029/0.00486

= 1:6

So the molecular formula of hydrate is CuSiF₆.6H₂O

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If Ka1 and Ka2 are sufficiently distinct and a polyprotic acid is titrated with a strong base, the pH curve will contain two equivalence points because the two acidic protons will be titrated sequentially.

Titration is a method of chemical analysis in which the amount of a sample's constituents is determined by adding a precise amount of a different substance—one that the desired constituent reacts with in a specific, known proportion—to the sample being tested.

The titrating reagent, or titrant, is gradually added to the process using a standard solution (i.e., a solution of known concentration), which is administered using a burette, which is essentially a long, graduated measurement tube with a stopcock and a delivery tube at its bottom end. The addition comes to an end at the comparable point.

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Answer:

It's a chemical change.

Explanation:

The process of burning (as opposed to evaporating) is a chemical reaction, a chemical change. The wax molecules are undergoing a chemical change; they are changing into different molecules by reacting with a substance in the air.

0.78 m³ is the volume of the same sample at standard temperature and pressure(stp) will be closest to the volume at 350 k and 1 atm.

The ideal gas law (PV = nRT) explains how the macroscopic properties of ideal gases are connected. The particles in an ideal gas are those that: (a) do not interact with one another; and (b) take up no space (have no volume). The ideal gas law does provide a good approximation of real gas behavior in many circumstances, but no gas is truly ideal.

PV = (nRT)

Where;

P₁ = initial pressure = 1 atm

V₁ = initial volume = 1 m³

T₁ = initial temperature = 350 k

P₂ = final pressure = 1 atm

V₂ = final volume = ?

T₂ = final temperature = 273 k

P₁V₁ / T₁ = P₂V₂ / T₂

Solving for V₂;

V₂ = P₁V₁T₂ / P₂T₁

V₂ = 1 × 1 × 273/350

V₂ = 273/350 m³

V₂ = 0.78 m³

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Answer:

1) endothermic reaction - melting of ice to water

2) exothermic reactions - burning of candles

Explanation:

Endothermic reaction:

endothermic reactions are chemical reactions that absorb heat from the environment.

In this case, when ice is melting to turn into water it absorbs heat from its surroundings and melts.

Exothermic reaction:

exothermic reactions are chemical reactions that release heat as a form of energy when a reaction takes place.

In the case of burning a candle, the heat is released into the environment.

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the rate at which the entropy of the two reservoirs changes is 0.00390837931 kw/k .

What is entropy ?

Entropy, a measure of a system's thermal energy per unit temperature not available for useful work. Work is obtained from molecular motion, the amount of entropy is a measure of the molecular disorder or randomness of a system. The concept of entropy gives us deep insight into the direction of spontaneous change in many everyday phenomena. Introduced in 1850 by German physicist Rudolf Clausius, it is the pinnacle of 19th-century physics.

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The titration of an impure sample of KHP found that 36.00 ml of 0.100 m NaOH was required to react completely with 0.758 g of sample. the percentage % of KHP in this sample is 96.9 %.

The equation for the reaction is :

KHP   +   NaOH   ----->  KNaP     +    H₂O

number of moles of NaOH = volume in L × molarity

                                             = 0.0360 × 0.100

                                             = 0.0036 mol

moles of KHP = moles of NaOH = 0.0036 mol

mass of KHP = molar mass × moles

                     = 204.2 × 0.0036

                     = 0.735 g

percentage of purity KHP =( mass of pure KHP / mass of impure ) × 100 %

                                          = (0.735 / 0.758 ) × 100 %

                                          = 96.9 %

Thus, The titration of an impure sample of KHP found that 36.00 ml of 0.100 m NaOH was required to react completely with 0.758 g of sample. the percentage % of KHP in this sample is 96.9 %.

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At this point, helium is exerting 1270 torr of pressure against its container.

Boyle's Law, a cornerstone of chemistry, describes the behavior of a gas sustained at a constant temperature. Robert A. Boyle discovered this law in 1662: at a certain temperature, the volume of a gas is inversely proportional to the pressure it exerts. To put it another way, if a gas is driven into a closed place, it will condense to fit the area but raise the pressure on the container.

Boyle's law, which is arguably a clearer way to put it, is the relationship between pressure and volume. Mathematically, Boyle's law can be written as pV=k, where p stands for the pressure, volume, and mass of the gas and k is a constant.

The solution is straightforward when temperature and moles are constant,

P₁V₁ = P₂V₂

Given,

P₁ = 760 torr

P₂ = ?

V₁ = 5.00 I

V₂ = 3.00 I

(760)(5.00) = (3.00)(P₂),

P2 = 1270 torr.

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The elements that has the quantum numbers shown are;

The quantum number is used to be able to identify the electron in an atom. We know that the orbital is a region in space where electrons could be fond and electrons are identified in the orbitals where they are found by the use of quantum numbers.

Now we have to use the quantum numbers as shown to be able to identify the elements that have them. This is so because the kind of element can be known from the quantum numbers that its electrons posses.

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Reduction in tourism and Groundwater recharge are possible environmental impacts of flooding  .

What are floods ?

During floods, people need to quickly move themselves and their most valuable possessions to higher ground. Leaving home in search of a safer place is called evacuation. Floods occur at irregular intervals and vary in magnitude, duration and areas affected.

Water flows naturally from high ground to low ground. This means that low-lying areas can flood quickly before they start reaching higher elevations. In rivers, flooding can occur, especially at bends and meanders in the channel, when flow exceeds the bed's capacity. Floods often damage homes and businesses when they are in the natural floodplains of rivers.

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