What is the percent composition of sulfur in H2SO4?

2.1%

B) 
65.2%

C) 
98.1%

D) 
32.7%

​

Answer:

C, The melting point is higher for octane.

Explanation:

Octane, C8H18, is a larger molecule. Larger molecules have stronger intermolecular forces, so they require more energy to be melted.

Answer:

The melting point is higher for octane.

Explanation:

got it right on edge

Answer:

=144a⁴−168a³b−239a²b²+168ab³+144b⁴

Explanation:

=144a⁴−168a³b−239a²b²+168ab³+144b⁴

Answer:

\((4a + 3b)(4a + 3b)(3a - 4b)(3a - 4b) \\ {16a}^{2} + 12ab + {9b}^{2} + 12ab + {9a}^{2} + 12ab + 12ab + {16b}^{2} \\ {16a}^{2} + {9a}^{2} + {9b}^{2} + {16b}^{2} + 12ab + 12ab + 12ab + 12ab \\ {25a}^{2} + {25b}^{2} + 48ab\)

You can fill in the table for other elements and their respective isotopes by determining the appropriate number of protons, neutrons, and electrons based on the given isotope mass number and atomic number.

To accurately fill in the table with the correct number of subatomic particles for the elements given the isotope mass number, we need to consider the composition of atoms and their respective subatomic particles. Atoms are composed of protons, neutrons, and electrons.

The number of protons in an atom is equivalent to its atomic number, which uniquely identifies the element. The number of neutrons can be determined by subtracting the atomic number from the isotope mass number. Electrons in a neutral atom are equal to the number of protons.

Let's take an example using the isotope mass number:

Isotope: Carbon-14 (mass number = 14)

Element: Carbon (atomic number = 6)Based on the atomic number and isotope mass number, we can determine the number of subatomic particles as follows:

Protons: 6 (same as the atomic number)

Neutrons: 14 - 6 = 8

Electrons: 6 (same as the number of protons in a neutral atom)

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Answer:

\(\boxed {\tt 944.748 \ grams}\)

Explanation:

The formula for density is:

\(d=\frac{m}{v}\)

Rearrange the formula for mass, m. Multiply both sides by v.

\(d*v=\frac{m}{v} *v\)

\(d*v=m\)

Mass is found by multiplying the mass by the volume.

The density of the gold is 19.32 grams per cubic centimeter. The volume is 48.9 cubic centimeters.

\(d= 19.32 \ g/cm^3 \\v=48.9 \ cm^3\)

Substitute the values into the formula.

\(m= 19.32 \ g/cm^3 *48.9 \ cm^3\)

Multiply. Note the centimeters cubed will cancel out.

\(m= 19.32 \ g * 48.9\)

\(m= 944.748 \ g\)

The mass of the gold is 944.748 grams.

A complex is a compound that is composed of a central metal atom/ion and then ligands.   MnO4- is a d^0 specie hence it has no d electron.

A complex is a compound that is composed of a central metal atom/ion and then ligands. These ligands may lead to the color of the complex. However, the color of complexes more commonly result from the d-orbital transition in the metal atom/ion.

Now we know that the neutral electron configuration of Mn is [Ar]. 3d5. 4s2. It then follows that MnO4- is a d^0 specie hence it has no d electron.

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Answer:

Falso

Explanation:

La electrólisis es la descomposición de una solución cuando la corriente continua se pasa a través de ella.

La corriente entra y abandona el electrolito a través de los electrodos. El electrodo positivo se llama el ánodo mientras el electrodo negativo se llama cátodo.

Los iones positivos se mueven hacia el cátodo, mientras que los iones negativos se mueven hacia el ánodo.

Dado que el cloruro es un ion negativo, se mueve hacia el ánodo y no hacia el cátodo.

Answer:

Must be stable and relatively insoluble in boiling water.

Explanation:

it must be stable and relatively insoluble in boiling water and a must-have vapor pressure in boiling water that is of the order atmosphere at or more compound satisfy these conditions that will generally not separate from each other but we'll be separated from everything else.

Answer:

Explanation:

In which step of the four-stroke engine cycle does the car release CO₂, H₂O, and CO?

O C. Exhaust

Answer: In the same Group

Explanation: Elements in the same group (row going down) have the same number of valance electrons. These valance electrons dictate their chemical properties and how they react with other elements/compounds.

Explanation: the answer plant seeds

not skin

Answer:

a. H₂(g) + Cl₂(g) ⇒ 2HCl (g)

HCl (g) + H₂O (l) ⇒ H₃O⁺ (aq) + Cl⁻ (aq)

b. 0.999 mol

Explanation:

a. Write the balanced equation for the synthesis of hydrochloric acid.  

The balanced equation for the synthesis of hydrochloric acid is thus

H₂(g) + Cl₂(g) ⇒ 2HCl (g)

HCl (g) + H₂O (l) ⇒ H₃O⁺ (aq) + Cl⁻ (aq)

b.  How many moles of chlorine are  required for the production of 72.92 g hydrochloric acid?

We need to find the number of moles of HCl contained in 72.92 g. So, molar mass M of HCl = molar mass of hydrogen + molar mass of chlorine

molar mass of hydrogen = 1 g/mol

molar mass of chlorine = 35.5 g/mol

So, molar mass of HCl = 1 g/mol + 35.5 g/mol = 36.5 g/mol.

We now find the number of moles n of HCl in 72.92 g from n = m/M where m = mass of HCl = 72.92 g

n = 72.92 g/36.5 g/mol = 1.998 mol.

From the balanced chemical equation, 1 mol of chlorine atoms produces 2 moles of hydrogen chloride gas. Therefore, the number of moles of chlorine atoms produces 1.998 mol HCl or 72.92 g HCl is 1 mol × 1.998 mol/2 mol = 0.999 mol

Collisions multiply as temperature rises. A reactant's concentration affects how frequently it collides with other reactants.

The reactant molecules move more quickly on average as the temperature rises. The number of molecules that move quickly enough to react grows as more molecules move quickly, which causes products to form more quickly.

Particles move at a higher average velocity as the temperature rises. These particles' typical kinetic energies are likewise raised. As a result, the particles will clash more frequently as they move quicker and interact with one another encounter more reactant particle.

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Answer:

Explanation:

That is because the Milkyway is full of dust and gas, you cannot really see something if it has dust and gas

Answer:

Its too far away to see

Explanation:

You would probably have to be in space

Answer:

53.6g of water are needed

Explanation:

Solubility is the maximum amount that a solvent can dissolve of a particular solute.

100g of Water can dissolve 140g of KI.

That is also the definition of a satured solution: A solution that is dissolved in the maximum amount in a particular amount of solvent.

If there are dissolved 75.0g of KI, the amount of water needed are:

75g KI * (100g water / 140g KI) =

Answer:

A:temperature

Explanation:

The temperature cannot be determined by looking at the spectra of the star due to lack of the equipment for its measurement. On the other-hand, the remaining statements like the distance from earth, movement towards or away from earth can be determined.

According to molar concentration, the concentration of the acid is 0.064 M.

Molar concentration is defined as a measure by which concentration of chemical substances present in a solution are determined. It is defined in particular reference to solute concentration in a solution . Most commonly used unit for molar concentration is moles/liter.

The molar concentration depends on change in volume of the solution which is mainly due to thermal expansion. Molar concentration is calculated by the formula, molar concentration=mass/ molar mass ×1/volume of solution in liters.In case of 2 solutions it is calculated as, M₁V₁=M₂V₂ which on substitution gives M₂=0.04×60/37=0.064 M.

Thus, the concentration of the acid is 0.064 M.

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The brain chemicals known as endorphins produce effects similar to opioids.

Opioids are a class of drugs that act on opioid receptors in the brain and produce pain relief, euphoria, and a sense of well-being.

Endorphins are natural neurotransmitters that are produced by the body in response to various stimuli, such as exercise, laughter, and certain foods.

When endorphins are released, they bind to opioid receptors in the brain, leading to feelings of pleasure and pain reduction. This is why endorphins are often referred to as the body's natural painkillers. Similar to opioids, endorphins can produce a sense of euphoria and an overall improvement in mood.

The release of endorphins is commonly associated with exercise. During physical activity, endorphins are released, which can result in a phenomenon known as the "runner's high." This is a feeling of euphoria and increased well-being that is often reported by long-distance runners.

In addition to exercise, other activities that can stimulate endorphin release include laughter, socializing, and certain types of foods, such as dark chocolate and spicy foods. These activities can promote feelings of happiness, relaxation, and pain relief, similar to the effects of opioids.

In summary, endorphins produce effects similar to opioids, including pain relief, euphoria, and an overall sense of well-being. They are natural chemicals produced by the body in response to various stimuli, such as exercise, laughter, and certain foods.

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The reaction between H2SO4 in a mixture of KI and MnO2 yields iodine which reacts with hypo solution​ by titration and the iodine is decolorized.

Iodine is decolorized.

The first reaction stated in the question occurs as follows;

2 KI (aq) + 2 H2SO4 (aq) + MnO2 (s) → MnSO4 (aq) + K2SO4 (aq) + I2 (s) + 2 H2O (l)

The reaction here is the formation of iodine from MnO2 and KI in the presence of dropwise H2SO4.

Hypo is the common name of sodium thio-sulphate or sodium hypo-sulfite.

The equation of the titration reaction is;

2Na2S2O3 + I2→ Na2S4O6 + 2NaI

When this reaction takes place, iodine is decolorized due to its reduction to I^-.

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The false statemen about the Catabolic pathways is they generate ATP.

option D is the correct answer.

Catabolic pathways involve the breakdown of complex molecules into simpler ones, releasing energy in the process.

Catabolism is the breakdown of complex substances to their constituent parts (glucose, amino acids and fatty acids) which form substrates for metabolic pathways or processes.

The true statement about catabolic pathways are;

Thus, the false statement is they generate ATP.

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The new pressure exerted by helium on its container is 2533.33 torr.

Boyle's law: For a fixed amount of an ideal gas kept at a fixed temperature, pressure and volume are inversely proportional. so PV= constant.

At constant temperature and moles,

P1V1 = P2V2.

The original sample is at 2atm torr and volume 5.00 L and then helium gas was compressed to 3.00 L

∴ P₁V₁ = P₂V₂

 (2× 760 torr)(5.00 L ) = (3.00 L )(x torr),

 x = 2533.33 torr.

 P₂ = 2533.33 torr.

Therefore, the new pressure exerted by helium on its container is 2533.33 torr.

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If he begins with 8.5 g of aluminum,62.1 gram of zinc chloride will he measure out for a complete reaction.

The balanced equation of reaction is defined as the total mass of reactant is equal to the total mass of product.

The balanced equation of reaction is as follows:

2Al + 3ZnCl₂ → 2AlCl₃ +3Zn

Now we must use stoichiometry to convert grams of Al to grams of ZnCl₂

The molar mass of aluminum is 27.99 g/mol

The molar mass of zinc chloride is 136.29g/mol

Zn = 65.39

Cl₂ = (35.45) = 70.9065.

= 39+70.90

= 136.329

The mole ratio of ZnCl₂ to Al is 3:2

= 8.5 × 3 × 136.329 / 27.99 × 2

= 62.1 gram

Thus, 62.1 gram of zinc chloride will he measure out for a complete reaction.

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The correct option is (C). The approximate final volume of a solution prepared by diluting 25 mL of 8.25 M sodium hydroxide to a concentration of 2.40 M is 86 mL (option C).

To find the final volume of the solution, we can use the formula:

C1V1 = C2V2

Where C1 is the initial concentration, V1 is the initial volume, C2 is the final concentration, and V2 is the final volume.

Plugging in the values we know, we get:

(8.25 M) (25 mL) = (2.40 M) (V2)

Solving for V2, we get:

V2 = (8.25 M x 25 mL) / 2.40 M
V2 = 86.25 mL

Therefore, the approximate final volume of the solution prepared by diluting 25 mL of 8.25 M sodium hydroxide to a concentration of 2.40 M is 86 mL (option C).

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The conditions for a standard electrochemical cell. select one or more : pressure of 1 atm temperature of 298 k solution concentrations of 1 M.

The electrochemical cell is the cell that is capable of generating the electrical energy from the chemical reactions or by the use of the electrical energy to cause the chemical reaction. The conditions for a standard electrochemical cell. select one or more : pressure of 1 atm temperature of 298 k solution concentrations of 1 M.  

There are the two types of the electrochemical cells is as follows : the galvanic called the electrolytic cells. the galvanic cell is also called as the voltaic cell.

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Answer:

Channel 7's frequency is 117.5 MHz

Answer:

174 MHz - 180 MHz w/ center frequency of 177 MHz

Explanation:

216 - 174 = 42

42/7 = 6

6 + 174 = 180          -           7                   -               177 MHz

180 + 6 = 186          -           8                   -               183 MHz

186 + 6 = 192          -           9                   -               189 MHz

192 + 6 = 198          -          10                   -               195 MHz

198 + 6 = 204          -          11                   -               201 MHz

204 + 6 = 210          -          12                  -               207 MHz

210 + 6 = 216          -           13                  -               213 MHz

The bond order for a second-period diatomic particle containing five electrons in antibonding molecular orbitals and eight electrons in bonding molecular orbitals is 1.5

Bond order is defined as the number of electrons in bonding molecular orbitals minus the number of electrons in antibonding molecular orbitals divided by two. As a result, we may determine the bond order of this diatomic particle by the formula: Bond order = (number of bonding electrons - number of antibonding electrons) / 2

Bond order = (8 - 5) / 2

Bond order = 1.5.

This diatomic molecule, according to the bond order, is a stable molecule since the bond order is greater than 1, indicating that it is a double bond. The molecule has an overall bond strength that is greater than a single bond, but not as strong as a triple bond. So therefore he bond order for a second-period diatomic particle containing five electrons in antibonding molecular orbitals and eight electrons in bonding molecular orbitals is 1.5

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