In aqueous solution, pyridine (C_5H_5N) is a weak base that accepts a proton from water to form the hydroxide ion (OH^-) and the pyridinium ion (C_5H_5NH^+), according to the following equation. C_5H_5N(aq) + H_2O(l) OH^-(aq) + C_5H_5NH^+(aq) The base-dissociation constant (K0) for this base is 1.7 times 10^-9. If the pH of the solution is 9.29, what is the initial concentration of pyridine? (Assume that the temperature is 25 degree C.)

Answer:

b. Liquid water - boils - water vapor

Explanation:

a. Liquid water - melts - solid water

This is wrong; Water to Solid is freezing

b. Liquid water - boils - water vapor

This is the correct option!

c. Solid water - condenses - liquid

This is wrong; solid to liquid is melting

d. Water vapor - evaporates - liquid water

This is wrong; vapor to liquid is condensation

if you add a little amount of an acid to an alkali, the pH of the solution will decrease. The pH at equivalence will depend on the relative strength of the acid present in solution.

have a great day!

Ingestion, dermal exposure, and inhalation are indeed the three main exposure routes.

The substances, such as copper, nitrogen, and oxygen, as well as compounds comprised of components like alcohol, carbon dioxide, and salt, as well as more complicated materials, such as a computers, the air you breathe, precipitation, a chicken, a car, etc., are examples of chemicals.

Chemicals are another name for matter, which is everything composed of atoms. Chemicals are the buildings you can create using atoms as the building pieces in a LEGO set. They could be solid, liquid, or gas in any form. Chemical can be a combination or a pure substance.

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Our current understanding of the atom is based on Dalton's early 19th-century idea of atomism, which was developed from meteorological investigations. John Dalton was just a meteorologist, an expert on color blindness, and a teacher, but he will be most widely recognized for creating the idea of atomism.

A scientist is someone who meticulously gathers data and uses it to develop theories, test those hypotheses, and further knowledge and understanding. Despite the fact that the name "scientist" predates Aristotle by more than two millennia, he is frequently referred to as the first scientist. He invented the methods of reasoning, observation, inquiry, and demonstration in Greece in the fourth century BC.

Because they provide specialized explanations for how the world functions, scientists play a crucial role in society. Science is a powerful tool for survival, despite the fact that it doesn't always provide us with joy, and humans have spent considerable time starting to figure out how to do both.

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Answer:

The event placed in order is;

b, a, c, d

Explanation:

1) b) The marble is placed on a wooden sled

Before the marble is lifted up the ramp, it is placed on a wooden sled that allows the pulley system which can be attached to the wooden sled to lift it up the ramp

2) a) The marble is moved up the ramp using the pulley system

The attached pulley system is then used to move the marble up the ramp

3) c) Iron wedges are used to break the massive marble

The massive marble is broken into pieces that can be worked upon by each mason

4) d) Masons begin carving the marble

The masons (more than one mason) begin carving the pieces of marbles into shape

Answer:

D) The attractive force decreases as the atom gets larger.

Explanation:

i did the lesson and tried all 3, all 3 times, this was the last one and only choice left so it has to be.

Answer:

The attractive force decreases as the atom gets larger.

Explanation:

The value of the equilibrium constant, Kc for the esterification of acetic acid and ethanol is 4.94 x 10⁻².

Esterification is a chemical reaction between a carboxylic acid and an alcohol which leads to the formation of ester as the reaction product. In the presence of a strong acid catalyst, acetic acid reacts with ethanol to form ethyl acetate, an ester, as well as water. The equation of the reaction is:-

C2H5OH(aq) + CH3COOH(aq) ⇌ CH3COOC2H5(aq) + H2O

In this equation, the forward reaction is the esterification of acetic acid and ethanol, while the backward reaction is the hydrolysis of ethyl acetate. The value of the equilibrium constant, Kc, is given by the following equation:-

Kc = [CH3COOC2H5] / [C2H5OH] [CH3COOH]

Substituting the given values into the equation for Kc gives:-

Kc = [0.86] / [1.00] [2.00] = 0.43 / 4 = 0.1085 = 4.94 x 10⁻²

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Answer:

Fusion doesn't produce runway chain reactions the way fission can, so there's no need to worry about meltdowns.

Answer:

Force = Pressure × Area

Explanation:

Easy, just invert the equation. Transpose the force variable over to the left of the equals sign, and transpose the pressure variable back to the right side.

The balancing of the equations are as follows:

1. 2 Na + N₂ -> 2 NaN

2. H₃PO₄ + 3 KOH -> K₃PO₄ + 3 H₂O

3. N₂ + 3 H₂ -> 2 NH₃

4. Fe + HCl -> FeCl2₂ + H₂

5. Zn + 2 HCl -> ZnCl₂ + H₂

6. CH₄ + 2 O₂ -> CO₂ + 2 H₂O

7. H₂S + CuSO₄ -> CuS + H₂SO₄

8. 2 NH₄ + + 2 NO₃ - -> N₂ + 4 H₂O

Chemical balancing, also known as chemical equation balancing, is the process of adjusting the coefficients in a chemical equation to ensure that the same number of each type of atom is present on both the reactant and product sides of the equation. In other words, chemical balancing ensures that the law of conservation of mass is satisfied for the given chemical reaction

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Given:

Crystal shield (CuSO4 . 5H2O) dissolves in water in the large tank.CuSO4′5H2O(s) → CuSO4 (aq) + 5H2O(l)0.01 mm = thickness of film layer24.3 g crystal/100 g water at 275 K, density 1140 kg/m3Diffusion of CuSO4 in dilute aqueous solution 3.6x10-10 m2/s at 275 K

Concentration can be taken at an average of 55.93 kmol/m3, water density 1000 kg/m3The mass of CuSO4 that dissolves per unit area per unit time is called flux.The transfer rate per unit area from the crystal surface to the bulk solution is given by;\(\frac{dn}{dt} = D.

A\frac{dc}{dx}\)Where, D is diffusion coefficient A is the area of the interfacec is the concentration of the diffusing species in the filmx is the direction of diffusion

From the given data, crystal density can be calculated as;\(\frac{24.3}{100+24.3}=0.1955\)

Now, we can calculate the mass transfer flux from the given data;\(\frac{55.93}{159.61}=\frac{C_{CuSO_4}}{1140}\)\(C_{CuSO_4}=39.76 kmol/m^3\)\(J = -D\frac{dc}{dx}\)

Since the inner film is saturated, \(c_0 = 39.76 kmol/m^3\)

At the outer surface, there is no CuSO4 present and the concentration gradient is;\(\frac{39.76-0}{0.01*10^{-3}}= 3.976*10^6 kmol/m^4\)\(J = -3.6*10^{-10}*3.976*10^6\)\(= -1.43456*10^{-3} kmol/m^2s\)

Thus, the mass transfer flux is -1.43456 * 10^-3 kmol/m^2s.

The transfer rate per unit area from the crystal surface to the bulk solution is -1.43456 * 10^-3 kmol/m^2s.

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Answer:

Conduction

Explanation:

Conduction can be regarded as transfer of thermal energy which exist

between two or more objects that are in contact with each other. From the question, the spoon touches the hot liquid and heat is transferred to the spoon through conduction

ANSWER

The addition of HCl will shift to reactants

EXPLANATION

When some strong acid is added to a buffer, the equilibrium is shifted to the left, and the hydrogen ion concentration increases by less than expected for the amount of strong acid added. Buffer solution helps in adjusting the pH of a substance.

Since the HCl is a strong acid, it will shift to the left (reactant sides)

The heat change for vaporization of 6.00 kg of water at 100°C is 13490.584 kJ.

The heat or enthalpy for vaporization is the amount of heat energy which is required to bring change in the state of a substance, such as from a liquid into a vapor or gas. It is also known as enthalpy of vaporization. The unit of enthalpy for vaporization is given in joules (J) or calories (cal).

Given data :

mass of water = 6.00 kg

Hvap = 40.7 kJ/mol

To calculate the amount of heat -

we know,

the heat required for 1 mol of water to vaporize at 100°C is 40.7 kg

and

we know molar weight of water is  18.015 gram

So,

moles of 6.00 kg water is  = 2600  

                                               18.1015

mole of water = 331.464 mol

Hence,

Heat change for vaporization is = 331.464 × 40.7

                                                     = 13490.584 kJ

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The number of moles present in 643 g of beryllium oxide is 25.71 mol.

Generally, mole is defined as the amount of a substance that contains the same number of elementary particles ( which includes ions, molecules, or atoms) as the number of atoms present in carbon is called the mole.

Mathematically,

Number of moles = Given mass / Molar mass

Here,

Given mass of BeO = 643 g

Molar mass of BeO = 25.01158 g/mol

Number of moles = 643 / 25.01158 = 25.71 mol

Hence, the number of moles present in 643 g of beryllium oxide is 25.71 mol.

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Answer:

Explanation:

Production of sulfur trioxide is O2 CO2

The number of unpaired electrons in a complex ion depends on the number of electrons in the d-orbitals of the metal ion. The d-electron configuration of each complex ion is as follows: 1) d5, 2) d3, 3) d8, 4) d5, and 5) d2.

The complex ion with the fewest number of unpaired electrons will be the one with the highest d-electron pairing energy, which is the energy required to pair up electrons in the same orbital. The complex ion with the highest pairing energy is [Ni(NH3)6]2+, with all of its electrons paired up. Therefore, the answer is 3) [Ni(NH3)6]2+.

The octahedral complex ion with the fewest number of unpaired electrons is 3) [Ni(NH_3)_6]^2+. This is because Ni^2+ has an electron configuration of 3d^8, which means all its d-orbitals are either completely filled or contain paired electrons. In contrast, the other complex ions have metal ions with more unpaired electrons in their d-orbitals, such as Fe^3+ (3d^5), Cr^3+ (3d^3), Rh^3+ (4d^6), and V^3+ (3d^2). The ligands in each complex do not significantly affect the number of unpaired electrons. Thus, [Ni(NH_3)_6]^2+ has the lowest number of unpaired electrons among the given options.

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The standard enthalpy change of the explosive reaction is -11408 kJ/mol.

The standard enthalpy change of the reaction can be calculated using the enthalpy of formation values of the reactants and products.

The enthalpy of the formation of ammonium nitrate (NH4NO3) is -393.5 kJ/mol, the enthalpy of the formation of the fuel oil (C10H22) is -249.7 kJ/mol, the enthalpy of the formation of oxygen (O2) is 0 kJ/mol.

The enthalpy of the formation of nitrogen (N2) is 0 kJ/mol, the enthalpy of the formation of water (H2O) is -285.8 kJ/mol, and the enthalpy of the formation of carbon dioxide (CO2) is -393.5 kJ/mol.

The equation for the explosive reaction is 3NH4NO3(s)+C10H22(l)+14O2(g)>3N2(g)+17H2O(g)+10CO2(g). Therefore, the standard enthalpy change of the reaction can be calculated using the following equation:

ΔH = [3(-393.5) + (-249.7) + (14*0) + (3*0) + (17*-285.8) + (10*-393.5)] - [3(-393.5) + (-249.7) + (14*0)]

ΔH = -11408 kJ/mol.

Therefore, the standard enthalpy change of the explosive reaction is -11408 kJ/mol.

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The complete question is attached below.

Answer:

Chemical formula

Explanation:

because chemical formulas use chemical elements , symbols , and numbers to present information about the chemical proportions.

Answer: It is usually separated from tea leaves by filtration. B Because the composition of the solution is uniform throughout, it is a homogeneous mixture. A Orange juice contains particles of solid (pulp) as well as liquid; it is not chemically pure.

Answer:

c

Explanation:

( The concentrations of reactants and products stop changing)

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Answer:

Chemically

in chemistry

Answer:

0.0220 g (22 mg) of NO2.

Explanation:

To solve this type of problem, it is best to work with grams. Remember that 1 kg equals 1000 g and 1 g equals 1000 mg. The conversion for 5.26 kg of nitrogen monoxide (NO) would be:

And for 7.64 mg of oxygen (O2) is:

The next step is to find the number of moles of each reactant using its molar mass. The molar mass of NO is 30 g/mol (you can calculate the molar mass of a compound using the periodic table):

And the moles of oxygen (O2) is 32 g/mol:

The next step is to see how many moles of NO" can be produced for each reactant.

You can see in the chemical equation that 2 moles of NO produce 2 moles of NO2, so the molar ratio between them is 1:1. This means that 175.33 moles of NO reacted produce 175.33 moles of NO2.

Now, you can see that 1 mol of O2 reacted produces 2 moles of NO2, so let's see how many moles of NO2 are being produced:

You can note that the limiting reactant, in this case, is oxygen (O2) because this reactant imposes the "limit" to produce the product.

The final step is to convert from 4.776 x 10^(-4) moles of NO2 to grams using its molar mass which is 46 g/mol. The conversion will look like this:

We obtain 0.0220 g (22 mg) of NO2 from 5.26 kg of NO and 7.64 mg of O2.

The volume that is occupied by the gas is obtained as  56 L.

We know that from the Avogadro's law, the volume that can be occupied by one mole of a gas is obtained as 22.4 L. This implies that we have to find the number of moles in the 70 g of the CO and then obtain the corresponding volume by simple proportion.

Number of moles of CO = 70.0 g/28 g/mol

= 2.5 moles

If 1 mole of the gas occupies 22.4 L

2.5 moles of the gas occupies 2.5 * 22.4/1 mole

= 56 L

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Answer:mixing decomposing

Explanation:

Melting and grinding changes the physical form and mixing decomposing doesn’t

If ∆H is negative and the ∆S is positive, then the process is: C. Always spontaneous.

∆H (entalphy change) is the amount of heat absorbed or evolved during a reaction at a constant pressure. Whereas ∆S (entropy change) is the disorder or the change in randomness in the system. Both affect the Gibbs free energy (∆G) which correlates to the spontaneity of a reaction.

The Gibbs free energy is based on this equation:

∆G = ∆H - T∆S

There are three meanings of ∆G values, which:

However, there are 4 conditions for spontaneity regarding the value of ∆H and ∆S. This could be seen in the table given below.

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Answer:

a salt water

Explanation:

because salt and water are mixchers

Answer:

salt watter and coffe.

Explanation:

A and B

Peroxides species shows the correct charge of the oxide ion.

As predicted by the two partially filled outer orbitals, oxygen assumes a negative oxidation state in all of its molecules. The oxide ion O2 is produced when electron transport fills these orbitals. It is thought that each oxygen in peroxides (species that contain the ion O2 2) has a charge of 1.

The carbon and hydrogen atoms have a slight positive charge, while the oxygen atom has a slight negative charge.

There are six valence electrons in the atom of oxygen. The oxygen atom requires two additional electrons in order to complete its valence shell. Adding two more electrons gives the oxygen ion a charge of two because each electron has a single negative charge.

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