Which period of the periodic table is comprised entirely of elements with no known stable isotopes?.

The mass (in grams) of Ag₂S₂O₃ formed when 125 g of AgBr react completely is 109.13 g

We can obtain the mass of Ag₂S₂O₃ formed by doing the following:

2AgBr + Na₂S₂O₃ -> Ag₂S₂O₃ + 2NaBr

From the balanced equation above,

375.4 g of AgBr reacted to produce 327.74 g of Ag₂S₂O₃

Therefore,

125 g of AgBr will react to produce = (125 × 327.74) / 375.4 = 109.13 g of Ag₂S₂O₃

Thus, the mass of Ag₂S₂O₃ formed is 109.13 g

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10.464  is the ph of a solution prepared by mixing 25.00 ml of 0.10 m methylamine, ch3nh2, with25.00 ml of 0.10 m methylammonium chloride, ch3nh3cl.

Methylamine and its conjugate acid, methylammonium chloride, are delivered to the buffer system. Since methylamine is a weak base, the pH of the buffer solution was requested. Thus, a buffer solution with 0.20 M methylamine and 0.15 M methylammonium chloride has a pH of 10.77.

Because H+ ions are produced during hydrolysis of CH3NH3+ ions in aqueous solution, the solution is acidic.

used in the production of rubber chemicals, medicines, pesticides, paint removers, and surfactants. A colourless to yellowish aqueous solution of a gas is how methylamine appears in aqueous solution. As the vapour concentration rises, the smell might be anything from fishy to ammonia-like.

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The total pressure exerted by a mixture of gases is equal to the sum of the partial pressures of the component gases at constant volume and temperature.

In the case of an ideal gas mixture, the combined pressure of the gases is equal to the sum of the individual pressures of each gas. This finding, also referred to as Dalton's law of partial pressures, is expressed as follows: P (total) Equals P 1 plus P 2 plus P 3 plus...

When the volume of a gas remains constant, the relationship between pressure and temperature is direct. When volume is constant, the pressure to temperature ratio remains constant.

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The concentration of naoh =0.166M

The quantity of solute that has been dissolved in a certain volume of solvent or solution is measured by the solution's concentration. A solution that contains a significant amount of dissolved solute is said to be concentrated. A solution is said to be dilute if it only contains a little quantity of dissolved solute.

Given some titration data, we are asked to determine the molar concentration of the NaOH solution.

Let's start by formulating the reaction's chemical equation:

NaOH(aq) +HCl(aq) → NaCl(aq)+H2O(l)

Using the molarity equation, we can find the number of moles of

HCl that reacted:

molarity =mol solute/L soln

mol solute=(molarity)(L soln)

mol HCl = (0.500mol/L) (0.00830L) = 0.00415molHCl

(volume converted to liters)

Now, using the coefficients of the chemical reaction, we can determine the number of moles of

0.00415 mol HCl (1lmol NaOH)/(1mol HCl) =0.00415 mol NaOH

Lastly, we'll use the molarity equation (using given volume of NaOH soln) again to determine the molarity of the sodium hydroxide solution:

molarity = mol solute/Lsoln

M(NaOH)=0.00415 mol/O.O250L = 0.166M

The concentration of naoh =0.166M

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0.00486 g of magnesium will react with an excess of hydrochloric acid to produce 500 mL of H2 (g) at STP.

The ideal gas is the virtual gas that chemists and students dream of because it would be much simpler if there weren't some kind of intermolecular force that would complicate the simple law of the ideal gas. An ideal gas is essentially a point cloud moving with constant random linear motion. Its behavior is described by the assumptions described in the kinetic molecular theory of gases. This ideal gas definition contrasts with the non-ideal gas definition. This is because this equation describes how gases actually behave.

The ideal gas law states that the product of pressure and volume in a gram molecule of an ideal gas is equal to the product of the gas's absolute temperature and the universal gas constant.

PV = nRT

Where, n = number of moles.

P = Pressure (1 atm)

T = Temperature (273 K)

V = Volume (0.5 L)

R = Ideal gas constant (8.314J/K⋅mol)

Now, substitute the values:

1 × 0.5 = n × 8.314 × 273

n = 0.00022 moles

Mg + 2HCl → MgCl₂ + H₂

The mole ratio of Mg and H₂ is 1:1 for the given reaction

Hence the number of moles for Mg will be same as H₂, which is 0.00022 moles.

For the mass of Mg:

m = n × Mm

Where, m = mass

n = number of moles (0.00022 moles)

Mm = molar mass (24.3 g/moles)

m = 0.00486 g

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The standard entropy of vaporization of ethanol at its boiling point 352K is 115.056 J/K-mol.

Given,

Enthalpy of vaporization of ethanol = 40.5 kJ/mol = 40.5 × 10³ J/mol

Entropy of vaporization of ethanol boiling point = 352 K

Determine the standard entropy of vaporization of ethanol,

We get here standard entropy of vaporization of ethanol that is expessed as,

Standard entropy of vaporization of ethanol ΔS = ΔH/T  .............1

Here ΔH is enthalpy of vaporization of ethanol and  T is the temperature.

Substitute the values in equation 1

Standard entropy of vaporization of ethanol ΔS = ΔH/T

                                                                                = [40.5 × 10³] / 352

                                                                                = 40500/352

                                                                                = 115.056 J/K-mol.

Hence, the standard entropy of vaporization of ethanol at its boiling point 352K is 115.056 J/K-mol.

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a. The chemical reaction can be rewritten as a word equation as follows:

Chlorine + Hydrogen -> Hydrogen Chloride + Explosion

b. Evidence that a chemical reaction has occurred includes the production of a new substance (hydrogen chloride gas), the release of energy (explosion), and a change in the physical properties of the reactants (change in color, odor, or temperature).

c. The reaction is likely exothermic, which means it releases energy. This is because the reaction produces a new substance (hydrogen chloride gas) and releases energy in the form of an explosion. In an endothermic reaction, the reactants would absorb energy from the surroundings.

Answer:

I can’t give a good answer

Explanation:

there’s nothing to answer

Gas that has increased in our atmosphere from 300 parts to 410 parts since 1950 is : 2) carbon dioxide (CO₂). It first exceeded 300 parts per million threshold in the 1950s and today it is over 410 parts per million.

The concentration of carbon dioxide in the atmosphere is currently nearly 412 parts per million. This shows a 47 percent increase since the beginning of the Industrial Age when the concentration was nearly 280 ppm.

The atmospheric level of carbon dioxide has been rising since the 1960's. In 2021, atmospheric carbon dioxide levels reached 416.45 parts per million in comparison to 1960 levels which was 316.91 parts per million.

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If all the copper in the trial reacts, then the amount of silver produced would be equal to the amount of copper present.

What is Silver nitrate?

Silver nitrate is a chemical compound with formula AgNO3. It is a strong oxidizing agent and is commonly used in chemistry experiments, photography, and in medical applications such as wound care. Silver nitrate is also used in some antiseptic products and in certain types of contact lenses.

Therefore, if the trial mentioned above contains 1 gram of copper, then 1 gram of silver would be produced.

What is Copper?

Copper is a reddish-brown metal that is malleable and ductile, and is one of the most conductive elements on the periodic table. It is often used in electrical wiring, piping, and other industrial applications because of its high electrical and thermal conductivity.

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The above sentence refers to n-15, the daughter nuclide of o-15's positron emission.

Examples of emissions include radio broadcasts, burps, and car exhaust. A discharge into the open is technically considered an emission. However, it most frequently refers to gases that are emitted into the atmosphere, such as greenhouse gases or emissions from companies and power plants.

Polluting emissions do not make up all emissions. As an illustration, during photosynthesis, plants release oxygen into the atmosphere. Pollutants are gases or particle that have been released into the air and have a detrimental effect on people or the environment.

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thermohaline circulation is driven by: density differences

Mass per unit volume is measured using the density unit. Given that it is an intense property, the size of the item has no bearing on the value of the property. Density Physics-related meaning The mass-to-volume ratio of an object is known as its density in physics. Mass per unit volume is a frequent definition. Chemistry's use of density The density of a substance in chemistry is a measurement of how much mass there is per unit volume. It is a physical characteristic that is intense, which means that the size of the object has no bearing on its value.

thermohaline circulation is driven by: group of answer choices the coriolis effect. longitude. density differences. wind. latitude.

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Answer: 3P4 + 10KCIO3 → 10KCI + 6P2O5

Explanation:

Answer:

3 P₄ + 10 KClO₃ -----> 10 KCl + 6 P₂O₅

Explanation:

Remember, the reactants are the species taking part in the reaction (left side) and the products are the species being created (right side). An equation is balanced when there is an equal amount of each element on both sides of a reaction. If the amounts are unequal, you can modify them by adding coefficients to change the quantity of particular compounds/molecules.

Unbalanced Equation:

P₄ + KClO₃ -----> KCl + P₂O₅

Reactants: 4 phosphorus, 1 potassium, 1 chlorine, 3 oxygen

Products: 2 phosphorus, 1 potassium, 1 chlorine, 5 oxygen

Balanced Equation:

3 P₄ + 10 KClO₃ -----> 10 KCl + 6 P₂O₅

Reactants: 12 phosphorus, 10 potassium, 10 chlorine, 30 oxygen

Products: 12 phosphorus, 10 potassium, 10 chlorine, 30 oxygen

Answer:

The National Institute of Standards and Technology defines STP differently as absolute pressure of 1 atm (101.325 kPa, 14.696 psi) and 20 degrees Celsius (293.15 degrees Kelvin, 68 degrees Fahrenheit).

Answer:

Global average temperatures and sea level would stay the same due to there being no change in atmospheric greenhouse gasses.

Answer:

0.1 mole

Explanation:

According to the formula, 1 mol of CaCO3 will require 2 mol of HCl

Molar mass of CaCO3 = 40.08 + 12.01 + 3(16.00) = 100.09 g/mol

so the 5g of CaCO3 equals : 5g x (1 mol/100.09g) = 0.0499 or 0.05 mol

so the mole of HCl required is: 0.05 x 2 = 0.1 mol

Answer: By the very laws of the universe, matter cannot be created or destroyed, the Big Bang cannot have happened by its own power. There was a creator involved.

Answer: __2__ H[tex]_2[/tex] + __1__ O[tex]_2[/tex] >>>> __2__ H[tex]_2[/tex]O

Explanation:

    To balance this equation, we must be sure that the amount of H [hydrogen] and O [oxygen] is the same on both sides. I will be using, and showing, a method my teacher showed me to help us solve.

        First, we will write out what we have:

_____ H[tex]_2[/tex] + _____ O[tex]_2[/tex] >>>> _____ H[tex]_2[/tex]O

H 2                               >>>>      H 2

O 2                               >>>>      O 1

        Then, we see that the O [oxygen] is unbalanced. We will use a coefficient of 2 to balance them. Then, we will multiply this through and see what we now have on the right side, the product.

_____ H[tex]_2[/tex] + _____ O[tex]_2[/tex] >>>> __2__ H[tex]_2[/tex]O

H 2                               >>>>      H  4

O 2                               >>>>      O 2

        Next, now we see the H [hydrogen] is unbalanced. We will use a coefficient of 2 to balance them. Again, we will multiply it through to see what we have on the left side, the reactants.

        After this, the equation is balanced and we have our answer.

__2__ H[tex]_2[/tex] + __1__ O[tex]_2[/tex] >>>> __2__ H[tex]_2[/tex]O

H   4                            >>>>      H  4

O 2                              >>>>      O 2

Answer:

The coefficient is the number of molecules and the subscript is the number of atoms

Explanation:

You can change the coefficient to balance an equation but, never touch the subscript. It cannot be changed.

a net ionic equation to show why solid potassium hydroxide, koH (s), forms a basic solution when it dissolves in water

Equation

KOH (s) [H2O ] →     K+(aq)+OH−(aq)

The Arrhenius theory, the Brnsted-Lowry theory, and the Lewis theory are the three ideas that have contributed to the definitions of acids and bases over time. According to Arrhenius, an acid is a chemical that, when ionised, releases protons (hydrogen ions) into the solution, whereas a base releases hydroxide ions.

According to Brnsted-Lowry, a base is a proton acceptor and an acid is a proton giver. According to Lewis, a base is an electron-pair donor, while an acid is an electron-pair acceptor

KOH satisfies the Arrhenius theory's definition of a base by producing hydroxide ions when ionised. The hydroxide ion is the base component from a Brnsted-Lowry perspective since it can accept a proton to create water. Although it is a little more difficult to understand from a Lewis perspective why this is a base, the oxygen in the hydroxide has three pairs of non-bonding electrons on it. When a proton (acid) is present, it lacks the electrons necessary to create a covalent link, therefore hydroxide donates an electron pair to the proton in order to build a coordinate covalent bond, which produces water. The three theoretical requirements for a base are thus satisfied by the aforementioned net ionic equation.

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The equilibrium constant, Kc, is the ratio of the equilibrium concentrations of products over the equilibrium concentrations of reactants each raised to the power of their stoichiometric coefficients.

For a reaction: aA + bB→ cC + dD

Equilibrium constant: Kc=[tex][C]^{c}[D]^{d}[/tex]/ [tex][A]^{a} [B]^{b}[/tex]

Characteristics of Kc:

1) Equilibrium can be approached from either direction.

2) Kc does not depend on the initial concentrations of reactants and products.

3) Kc does depend on temperature.

Magnitude of Kc:

1) If the Kc value is large (Kc >> 1), the equilibrium lies to the right and the reaction mixture contains mostly products.

2)  If the Kc value is small (Kc <<1), the equilibrium lies to the left and the reaction mixture contains mostly reactants.

3) If the Kc value is close to 1 (0.10 < Kc < 10), the mixture contains appreciable amounts of both reactants and products.

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The six main compounds that we should explore are carbohydrates, lipids, proteins, nucleotides, fats, and water.

In chemistry, a compound is described as a substance that is made up of two or more different chemical elements combined in a fixed ratio. When the elements come together, they react with each other and form chemical bonds to form a chemical compound that are difficult to break.

Compound is mainly classified into two groups ionic and molecular. The compound which contains ionic bond between its constituent elements is known as ionic compound whereas the compound which contains covalent bond between its constituent elements is known as covalent compound.

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Answer:

This is ez 123 me no eleglesh

Explanation:bn

Answer:

electric charge

Explanation:

Electric charge is a physical property of matter that imparts a force on charged matter when placed in an electromagnetic field. Charge can be positive or negative (typically carried by protons and electrons, respectively). Similar charges repel and dissimilar charges attract.

Answer:Electric Charge I hope this helpful

Explanation:

Electric Charge. Electrical property of matter that creates electric/magnetic forces and interactions.Electric charge is a physical property of particles or objects that causes them to attract or repel each other without touching. All electric charge is based on the protons and electrons in atoms. A proton has a positive electric charge, and an electron has a negative electric charge.

The nuclear charge for Ze is 3e and effective nuclear charge is 1.26e  and for the quantum number is 2.

What is ionization energy for an atom?

The ionisation energy is a metric indicating an element's capacity to engage in chemical processes that call for the donation of electrons or the production of ions. It is also often correlated with the type of chemical bonding that occurs when elements combine to form compounds.

I= 13.1×10²Z (eff)/n²

Zeff = √I×n²/13.1ₓ10²

for lithium I = 520.2

Z²eff = 520.2×4/13.1×10²=1.56

Zeff= 1.26 e

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Explanation:

The equation describes the combustion of methane (CH4). Methane burns in oxygen (O2) to produce carbon dioxide and water.

The equation is also not balanced. O2 should have a coefficient of 2.