how many lone electron pairs does the cn (-1 charged) polyatomic anion have?

Answer:

42 L

Explanation:

de los parámetros en la pregunta;

V1 = 358L

T1 = 152 ° C + 273 = 425 K

P1 = 470 mmHg × 1 atm / 760 mmHg = 0.6atm

V2 =?

P2 = 6 atmósferas

T2 = 500 K

P1V1 / T1 = P2V2 / T2

P1V1T2 = P2V2T1

V2 = P1V1T2 / P2T1

V2 = 0,6 × 358 × 500/6 × 425

V2 = 107400/2550

V2 = 42 L

ICI(1) + CL(g) ICI,(s) is an endothermic reaction.

Any transition from a more ordered to a less ordered state (solid to liquid, liquid to gas, or solid to gas),in which r energy, is used referred to as an endothermic reaction. Likewise, any transition from a less ordered to a more ordered state (liquid to solid, gas to liquid, or gas to solid), which releases energy, is referred to as an exothermic reaction

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The buffer ph most effective at allowing amphoteric proteins to migrate toward the cathode in an electrophoretic system would be  4.5

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The buffer ph most effective at allowing amphoteric proteins to migrate toward the cathode in an electrophoretic system would be  4.5

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\(pH \: is \:  a \: measure \: of \: how \: acidic/ \: basic \: water\\ \: is \: The \: range \: goes \: from \: 0 - 14, \: with \: 7 \: being\\ \: neutral. \: pHs \: of \: less \: than \: 7 \: indicate \: acidity, \\ \: whereas \: a \: pH \: of \: greater \: than \: 7 \: indicates \: a\\ \: base. \: pH \: is \: really \: a \: measure \: of \: the \: relative\\ \: amount \: of \: free \: hydrogen \: and \: hydroxyl \:ions\\ \: in \: the \: water.\)

The overall heat transfer coefficient, U, is the sum of the individual heat transfer coefficients on the inner and outer surfaces of the pipe. To find U, we need to calculate the individual heat transfer coefficients and then sum them.

First, let's calculate the individual heat transfer coefficient on the inner surface of the pipe. We can use the convective heat transfer coefficient formula:

h_inner = 5680 W/m^2 K

Next, let's calculate the individual heat transfer coefficient on the outer surface of the pipe. Again, we can use the convective heat transfer coefficient formula:

h_outer = 22.7 W/m^2 K

Now, let's find the overall heat transfer coefficient, U:

U = (1 / h_inner + 1 / h_outer)^-1

Substituting the values we have:

U = (1 / 5680 + 1 / 22.7)^-1

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Explanation:

Solution — 1 molecule of O2 = 2 oxygen atoms So, 1 mole of O2 = 2 mole oxygen atoms = 2 × 6.022 × 1023 = 12.044 ×1023 oxygen atoms.

Mole measure the number of elementary entities of a given substance that are present in a given sample. Therefore, 1.2044 ×10²⁴ oxygen atoms are there in a 2 moles of oxygen atoms.

The SI unit of amount of substance in chemistry is mole. The mole is used to measure the quantity or amount of substance. We know one mole of any element contains 6.022×10²³ atoms which is also called Avogadro number.

Mathematically,

number of mole of O\(_2\)= 2 mole

number of atoms/molecules=number of moles × 6.022×10²³(Avogadro number)

substituting all the given values in the above equation, we get

number of  oxygen atoms = 2 × 6.022 × 10²³

number of  oxygen atoms= 1.2044 ×10²⁴ oxygen atoms.

Therefore,  1.2044 ×10²⁴ oxygen atoms are there in a 2 moles of oxygen atoms.

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Batteries convert chemical energy into electrical energy.

When a battery is charged, it stores chemical energy in its cells, which is then converted to electrical energy when needed. The chemical energy is stored in the battery's anode and cathode in the form of chemical compounds. When an electrical load is connected, a chemical reaction occurs in the battery, which results in the release of electrons from the anode. These electrons then flow through the circuit and return to the cathode, producing an electrical current.

As the battery discharges, the chemical compounds in the anode and cathode break down, resulting in a decrease in the battery's capacity to store energy. Once the battery is completely discharged, it can either be recharged or discarded.

Overall, batteries are essential sources of portable power as they can convert stored chemical energy into electrical energy, which is widely used in various electronic devices, automobiles, and many other applications.

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The calcium ion has 18 protons, 20 neutrons, and 20 electrons.
The relationship between the components a and b is Inverse proportion.


The calcium ion (Ca2+) has a 2+ charge, indicating that it has lost 2 electrons from its neutral state. To determine the number of protons, neutrons, and electrons in the calcium ion, we need to consider its atomic number and mass.

The atomic number of calcium is 20, which indicates that it has 20 protons. Since the calcium ion has a 2+ charge, it means it has lost 2 electrons. Therefore, the number of electrons in the calcium ion is 20 - 2 = 18.

The mass number of calcium is 40 amu, which represents the total number of protons and neutrons. Since the calcium ion has 20 protons, the number of neutrons can be calculated as 40 - 20 = 20.

So, the correct option is: d. 18 protons, 20 neutrons, and 20 electrons

In the expression a∼1/b, the relationship between the components a and b is an inverse proportion. This means that as the value of a increases, the value of b decreases, and vice versa. The symbol ∼ represents the proportional relationship between a and 1/b, indicating that they are inversely related. Therefore, the correct answer is: Inverse proportion

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Carbon dioxide (CO2) lewis structure has two oxygen atoms and one carbon atom. There are two double bonds around carbon atom in the CO2. No lone pairs on carbon atom and each oxygen atom has two lone pairs on their valence shells. Shape of CO2 is linear.

The correct answer is:  d. It should be stable during the course of the reaction.

A good protecting group should be stable under the reaction conditions and not react with the reagents used in the reaction. Its purpose is to temporarily protect a specific functional group from undesired reactions or transformations while allowing other reactions to take place. The protecting group should be easily removable under specific conditions (cleavable) after the desired reactions have occurred, without affecting the rest of the molecule. The stability of the protecting group ensures that it remains intact throughout the reaction, protecting the functional group it is intended to shield. Once the reaction is complete, the protecting group can be selectively cleaved without affecting the rest of the molecule, thus restoring the original functional group.

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Answer:

it would be b

Explanation:

because when the roller coaster is going downhill it is moving faster so that means there is potential energy becoming kinetic energy because kinetic energy is made from movement

Answer:  1

Explanation: Because it is not moving

​In a bag of peas that weighs 454 grams, there are between 1261 and 4540 peas.

The average pea weighs between 0.1 and 0.36 grams.

If we take the lower value (0.1 g/pea), the number of peas in 454 g is:

\(454 g \times \frac{1pea}{0.1 g} = 4540pea\)

If we take the higher value (0.36 g/pea), the number of peas in 454 g is:

\(454 g \times \frac{1pea}{0.36 g} \approx 1261pea\)

​In a bag of peas that weighs 454 grams, there are between 1261 and 4540 peas.

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The compound formed when magnesium oxide reacts with water is magnesium hydroxide (Mg(OH)₂).

Magnesium oxide (MgO) is an ionic compound consisting of magnesium cations (Mg²⁺) and oxide anions (O²⁻). When it reacts with water (H₂O), the oxygen atom in water attracts the magnesium cation, leading to the formation of magnesium hydroxide.

The reaction can be represented as follows:

MgO + H₂O → Mg(OH)₂

In the resulting compound, magnesium hydroxide, there are two hydroxide ions (OH-) for every magnesium ion (Mg²⁺). The chemical formula Mg(OH)₂ represents this ratio.

Magnesium hydroxide is an alkaline compound and is commonly used as an antacid to treat heartburn and indigestion. It is also used in various industrial applications.

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Answer:

Cells help the human body in many ways, Red or white blood cells are very important and are commonly spoken when bringing up cells. Plants have cells as well plant cells have special organelles called chloroplasts, which create sugars also known as photosynthesis.

Explanation:

idrk if that helped much-

A 569 mL NaCl solution that has been diluted to a volume of 1.37 L and a concentration of 3.00 M. The initial concentration of the NaCl solution was approximately 7.21 M.

It can be found using the formula:

initial concentration x initial volume = final concentration x final volume

We are given that the final concentration is 3.00 M and the final volume is 1.37 L.

The initial volume can be found by converting the initial volume from milliliters to liters:

569 mL ÷ 1000 mL/L = 0.569 L

Now we can plug in the values we know and solve for the initial concentration:

(initial concentration)(0.569 L) = (3.00 M)(1.37 L)

initial concentration = (3.00 M)(1.37 L) ÷ (0.569 L)

initial concentration ≈ 7.21 M

Therefore, the initial concentration of the NaCl solution was approximately 7.21 M.

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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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Answer:

Explanation:

When you use electricity to charge your car, you can integrate renewable resources like solar into the fueling process. Without solar, your electric vehicle is still effectively running off of fossil fuels – it's just the fossil fuels utilized at the power plant and not within your engine.

Fossil fuels include substances like natural gas, coal, and oil. It is possible for electric cars to run on these fossil fuels. Fossil fuels like coal are burnt up to generate electricity. So when cars run on electricity, they are indirectly tapping into fossil fuels.

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Answer:

3.08 grams

Explanation:

Answer:3.08 grams

Explanation:

faxxxsss

i cant understand your question define briefly

Answer:

The octet rule refers to the tendency of atoms to prefer to have eight electrons in the valence shell. When atoms have fewer than eight electrons, they tend to react and form more stable compounds. Atoms will react to get in the most stable state possible.

Explanation:

hope it helps

Hyperconjugative effects: the acidity of H-A increases as the percent s-character of the conjugate base increases.

Hyperconjugative effects refer to the stabilization of a molecule through the transfer of electron density from a sigma bond to an adjacent p orbital. This results in increased s-character in the bond, making it more polarized and more acidic. In other words, the greater the s-character in the bond, the more acidic the hydrogen-atom bond (H-A) becomes.

Hyperconjugation occurs in organic molecules that contain alkyl groups attached to a carbonyl or a nitrile group. The electron-donating effect of the alkyl group enhances the stability of the molecule, which leads to an increase in acidity.

Hyperconjugation is an important concept in organic chemistry and plays a role in the determination of acidity, reactivity, and stability of organic compounds. It is also used to explain the stability of carbocations, carbanions, and free radicals, among other species.

In summary, hyperconjugation refers to the stabilization of a molecule through the transfer of electron density from a sigma bond to an adjacent p orbital, resulting in increased s-character and acidity.

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Answer:

²³⁴₉₃Np.

Explanation:

We can obtain the daughter particle as follow.

Let ⁿₓM represent the daughter particle.

Thus, the equation for the reaction is given below :

²³⁴₉₂U —> ⁿₓM + ⁰₋₁e

Next, we shall determine n, x and M. This can be obtained as follow:

234 = n + 0

234 = n

n = 234

92 = x + (–1)

92 = x – 1

Volume like terms

92 + 1 = x

93 = x

x = 93

ⁿₓM => ²³⁴₉₃M => ²³⁴₉₃Np

Thus, the equation for the reaction becomes:

²³⁴₉₂U —> ²³⁴₉₃Np + ⁰₋₁e

The daughter particle => ²³⁴₉₃Np

P(C|G) = P(C and G) / P(G)

Given that the probability of a student taking Chemistry AND Geology is 0.08 (P(C and G) = 0.08) and the probability of a student taking Geology is 0.45 (P(G) = 0.45), we can substitute these values into the formula:

P(C|G) = 0.08 / 0.45 ≈ 0.1778

Therefore, the probability that a student will choose Chemistry given that the student is taking Geology is approximately 0.1778, or 17.78%.

P(Disease|Positive) = (P(Positive|Disease) * P(Disease)) / P(Positive)

Given that the disease is common in 3% of the population (P(Disease) = 0.03), the error rate for people who are disease-free getting a positive reaction is 7% (P(Positive|Disease-free) = 0.07), and the error rate for people who have the disease getting a negative reaction is 2% (P(Negative|Disease) = 0.02), we can calculate the probability of a positive result (P(Positive)) as follows:

P(Positive) = (P(Positive|Disease) * P(Disease)) + (P(Positive|Disease-free) * P(Disease-free))

= (0.98 * 0.03) + (0.07 * 0.97)

≈ 0.0294 + 0.0679

≈ 0.0973

Now, we can substitute these values into Bayes' theorem:

P(Disease|Positive) = (0.98 * 0.03) / 0.0973

≈ 0.0294 / 0.0973

≈ 0.3026

Therefore, the probability that a person tested at random indeed has the disease given that the test result shows positive is approximately 0.3026, or 30.26%.

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Both H₂ (Hydrogen gas) and Br₂ (Bromine gas) are non-polar molecules.

Because both bromine atoms in this molecule have the same electronegativity, their charge distributions are identical, and there is no net dipole moment, making Br₂ (Bromine) nonpolar.

A non-polar molecule is H₂. Nonpolar molecules do not respond to electrostatic charges like water does because their charges are distributed equally. Since hydrogen atoms distribute their electrons evenly, covalent molecules comprised of only one kind of atom, like hydrogen gas (H₂), are nonpolar.

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Answer:

C. Animals can get tangled up in the trash and be unable to swim or otherwise move

According to the question there are approximately 1.68 x 10^23 atoms of sulfur in 12.5g of sulfur.

Sulfur is a non-metallic chemical element that is found in nature in both pure form and as part of minerals and metals. Its symbol on the periodic table is S and its atomic number is 16. It is an abundant, yellow, odorless, brittle solid that is insoluble in water. Sulfur is one of the oldest known elements and is found in many compounds in its native form. It is used in a variety of applications, such as in the production of sulfuric acid, in the manufacturing of rubber, in the processing of petroleum and natural gas, and in the production of pharmaceuticals.

There are approximately 1.68 x 10^23 atoms of sulfur in 12.5g of sulfur. This is because sulfur has a molar mass of 32.06 g/mol, so 12.5g of sulfur is equivalent to 0.39 moles of sulfur (12.5g/32.06g/mol). Since 1 mole of sulfur atoms contains 6.022 x 10^23 atoms, 0.39 moles of sulfur atoms contains 0.39 x 6.022 x 10^23 atoms, which is approximately 1.68 x 10^23 atoms.

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Compound          Type of IMFs                   Sublime at STP?

Carbon dioxide       London dispersion         Yes

Hydrogen fluoride  Hydrogen bonding   No

Calcium chloride     Ionic bonding                  No

Naphthalene        London dispersion         Yes

Iodine                      London dispersion        Yes

Sodium chloride        Ionic bonding                 No

Water                    Hydrogen bonding         No

A chemical compound is described as  a chemical substance composed of many identical molecules containing atoms from more than one chemical element held together by chemical bonds.

London dispersion forces are also described as a type of intermolecular force acting between atoms and molecules that are normally electrically symmetric.

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