do atoms get bigger or smaller when they ionize to form anions?

Answer:

Amount of NH3 in g = 0.0867 g

Explanation:

Molecular mass of

0.0051 mol has same no. of molecules in both NH3 and SF6.

Amount of NH3 in g = Mole × Molar mass

Molar mass of NH3 = 17.00 g/mol

Amount of NH3 in g = 0.0051 × 17.00

                                 = 0.0867 g

Answer:

Given:

Mass of Ca(OH)2 = 65.0 g

Molar mass of Ca(OH)2 = 74.09 g/mol

2 moles of HCl reacts with 1 mole of Ca(OH)2

Solution:

Number of moles of Ca(OH)2 = mass / molar mass = 65.0 g / 74.09 g/mol = 0.877 mol

From the balanced chemical equation, we see that 1 mole of Ca(OH)2 reacts with 2 moles of HCl to form 1 mole of CaCl2 and 2 moles of H2O. Therefore, 0.877 mol of Ca(OH)2 reacts with 2 × 0.877 = 1.754 moles of HCl.

1 mole of Ca(OH)2 produces 1 mole of CaCl2, so 0.877 mol of Ca(OH)2 will produce 0.877 mol of CaCl2.

Therefore, 0.877 moles of CaCl2 will be formed if you start our reaction with 65.0 grams of Ca(OH)2.

Even one gram of a pure element is known to have an enormous number of atoms when working with particles at the atomic (or molecular) level. The mole idea is frequently applied in this situation. Here the number of moles is 0.877.

The mole idea is a useful way to indicate how much of a substance there is. A mole is the amount of a substance that includes precisely 6.022 × 10²³ of the substance's "elementary entities," according to the science of chemistry.

Popularly known as the Avogadro constant, the quantity 6.022 × 10²³ is frequently represented by the letter "NA". Atoms, molecules, monoatomic/polyatomic ions, and other particles (such electrons) are examples of the elementary entities that can be represented in moles.

Number of moles = Given mass / Molar mass

Molar mass of Ca(OH)₂ = 74.093 g / mol

n = 65.0 /  74.093 = 0.877 moles

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Answer:

Ethanol does not conduct electricity because its molecules exhibit covalent bonds. This bond exists strongly in the (OH-) group and will keep the alcohol’s structure in place in an electric field. In other words, dissociation will not occur, and free or mobile electrons will be absent in ethanol.

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The density of CO gas at 1140 torr and 75.0 °C is 14.8 g/L.

To solve for density (d), we can use the ideal gas law equation, which states that PV = nRT, where P is the pressure, V is the volume, n is the number of moles, R is the gas constant, and T is the temperature.

First, we need to convert the pressure from torr to atm, which is 1140/760 = 1.50 atm.

Next, we need to convert the temperature from Celsius to Kelvin, which is 75.0 + 273.15 = 348.15 K.

We can assume that we have one mole of CO gas, since the ideal gas law equation uses moles. Therefore, n = 1.

The gas constant R is 0.0821 L·atm/(mol·K).

Now we can rearrange the ideal gas law equation to solve for V:

V = nRT/P

V = (1 mol)(0.0821 L·atm/(mol·K))(348.15 K)/(1.50 atm)

V = 1.89 L

Finally, we can calculate density using the formula:

d = mass/volume

Since we have one mole of CO gas, we can use its molar mass of 28.01 g/mol.

mass = n × molar mass

mass = (1 mol)(28.01 g/mol)

mass = 28.01 g

d = mass/volume

d = 28.01 g/1.89 L

d = 14.8 g/L

Therefore, the density of CO gas at 1140 torr and 75.0 °C is 14.8 g/L.

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To calculate the Ksp value in the presence of ion activity, it is necessary to measure the ion product at the point of saturation for multiple compounds. The ion product nears the Ksp value at lower concentrations due to lower ionic strength and temperatures. A spectrophotometer is finally used to determine the Ksp Value.

The Ksp value is a measure of the solubility of a compound, and it can be calculated using the ion product constant equation. However, in the presence of ion activity, the measured ion product may deviate from the theoretical value, and so multiple measurements are necessary to determine the correct Ksp value.

At higher concentrations, the ionic strength of the solution increases, which can lead to changes in the ion activity and deviations from the theoretical Ksp value. However, at lower concentrations, the ionic strength is lower, and so the ion activity more closely approximates the theoretical value. Additionally, at lower temperatures, the solubility of the compound decreases, which further helps to reduce the deviation from the theoretical Ksp value.

A spectrophotometer can be used to measure the concentration of ions in solution, and so it can be used to determine the ion product at the point of saturation for multiple compounds. This information can then be used to calculate the Ksp value for each compound.

Step by step explanation:
1. Measure the ion product at the point of saturation for multiple compounds using a spectrophotometer.
2. Determine the concentration of each ion in solution.
3. Use the ion product constant equation to calculate the Ksp value for each compound.
4. Compare the calculated Ksp values to the theoretical values to assess the accuracy of the measurements.

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(a) A calcium atom has a larger radius than a calcium ion.
(b) A chlorine atom has a larger radius than a chloride ion.
(c) A magnesium ion has a smaller radius than an aluminum ion.


(a) An atom has a larger radius than an ion because an ion has lost or gained electrons, which changes its electronic configuration and affects the attraction between the nucleus and the remaining electrons. In the case of calcium, the calcium ion has lost two electrons, which reduces the size of the ion and makes it smaller than the neutral calcium atom.
(b) Similar to calcium, a chlorine atom has a larger radius than a chloride ion due to the change in electronic configuration. A chloride ion has gained one electron, which increases the effective nuclear charge and pulls the remaining electrons closer to the nucleus, resulting in a smaller ion.
(c) Magnesium and aluminum are both cations, but aluminum has a smaller radius than magnesium due to the increased nuclear charge in aluminum. This attracts the valence electrons more strongly, resulting in a smaller ion.

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To rank the following compounds for increasing acidity: hexanol, phenol, and cyclohexanol, we need to consider their structures and the stability of the conjugate base formed after donating a proton.

1. Hexanol (C6H13OH): Hexanol is an aliphatic alcohol with a linear chain. When it loses a proton (H+), it forms an alkoxide ion (C6H13O-) with a negative charge on the oxygen atom. This conjugate base is relatively unstable due to the electron-donating nature of the carbon chain.

2. Cyclohexanol (C6H11OH): Cyclohexanol is also an aliphatic alcohol, but with a cyclical structure. Similar to hexanol, when it donates a proton, it forms an alkoxide ion (C6H11O-) with a negative charge on the oxygen atom. The conjugate base's stability is slightly higher than that of hexanol due to the electron delocalization within the ring structure.

3. Phenol (C6H5OH): Phenol is an aromatic alcohol with a hydroxyl group attached to a benzene ring. When it loses a proton, it forms a phenoxide ion (C6H5O-) with a negative charge on the oxygen atom. This conjugate base is highly stable due to the resonance stabilization offered by the benzene ring.

In conclusion, the increasing order of acidity is: hexanol < cyclohexanol < phenol.

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Your lab write-up confirmed that the third mechanism, which involves an iodide ion and a persulfate ion coming together, is the rate determining step for your experiment.

If the first mechanism is correct (two iodide ions coming together), then doubling the concentration of iodide ions would increase the rate of the reaction. This is because the rate-determining step involves two iodide ions coming together, so increasing the concentration of iodide ions would increase the likelihood of this step occurring.

If the first mechanism is correct, then doubling the concentration of persulfate ions would not have any effect on the rate of the reaction. This is because the rate-determining step does not involve persulfate ions, so increasing their concentration would not affect the rate.

If the second mechanism is correct (persulfate ion decomposing), then doubling the concentration of iodide ions would not have any effect on the rate of the reaction. This is because the rate-determining step does not involve iodide ions, so increasing their concentration would not affect the rate.

If the second mechanism is correct, then doubling the concentration of persulfate ions would increase the rate of the reaction. This is because the rate-determining step involves persulfate ions decomposing, so increasing their concentration would increase the likelihood of this step occurring.

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Today, the voltaic pile is better known as a battery.

Alessandro Volta's 1800 invention, the voltaic pile, is today better known as an electric battery. The voltaic pile was the first electrical battery that could continuously provide an electric current to a circuit. The invention of the voltaic pile opened up new avenues of research and exploration in the field of electrochemistry, which studies the relationship between electricity and chemical reactions.

It consisted of alternating layers of zinc and copper discs separated by pieces of cardboard or cloth soaked in an electrolyte solution such as brine or dilute acid. The Voltaic pile produced a continuous and stable electric current, which was a groundbreaking discovery in the field of electricity. Although the Voltaic pile was eventually replaced by more efficient battery designs, its invention laid the foundation for the development of modern batteries and the field of electrochemistry.

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The mole fraction of NH₃ in the solution is 0.0174. We use the given information about the mass of NH₃ and water, as well as the density of the resulting solution, to find the volume of the solution. From there, we use the molarity of NH₃ to calculate its moles, and then used the mole fraction equation to find the mole fraction of NH₃ in the solution.

To find the mole fraction of NH₃ in the solution, we need to first calculate the total mass of the solution.

Total mass of solution = mass of NH₃ + mass of water
= 15.0 g + 250.0 g
= 265.0 g

Next, we can calculate the volume of the solution using the density given:
Volume of solution = mass of solution / density
= 265.0 g / 0.974 g/ml
= 272.09 ml

Now, we can use the volume and concentration of NH₃ to calculate its mole fraction.
Molarity of NH₃ = mass of NH₃ / molar mass of NH₃ / volume of solution
= 15.0 g / 17.03 g/mol / 0.27209 L
= 0.988 M
Mole fraction of NH₃ = moles of NH₃ / moles of NH₃ + moles of H₂O
= 0.988 / (0.988 + 55.51)
= 0.0174

Therefore, the mole fraction of NH₃ in the solution is 0.0174.

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If functional groups are not protected, reagents will tend to act on them based on their chemical properties and reactivity. For example, nucleophiles such as Grignard reagents and organolithium compounds will react with carbonyl groups (aldehydes, ketones, and esters) to form alcohol derivatives.

Acids will react with basic functional groups such as amines and hydroxyl groups to form salts or esters, while bases will react with acidic functional groups such as carboxylic acids and phenols to form salts or ethers.

Additionally, unprotected double bonds and triple bonds are susceptible to electrophilic additions or reductions. Therefore, the specific functional group that a reagent will act on depends on the type of reagent and the reactivity of the functional group in question.

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In most terrestrial vertebrates, ammonium is ultimately converted to urea for the purpose of secretion.

This process occurs in the liver and allows for the excretion of nitrogenous waste products in a less toxic form than ammonium. Urea is then transported to the kidneys for elimination from the body.
. This conversion occurs in the liver, where the urea cycle takes place. Urea is a less toxic waste product and can be efficiently excreted in the urine, which is beneficial for terrestrial animals as they typically have limited access to water.

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The second ionization energy for Na+ will be disproportionately larger than the first ionization energy due to the following reasons:

1. Energy levels: The first ionization energy refers to the energy required to remove one electron from a neutral sodium atom (Na), while the second ionization energy refers to removing an electron from the Na+ ion. In the first case, the electron is removed from the outermost energy level, which is further away from the nucleus. In the second case, the electron is removed from an inner energy level, which is closer to the nucleus and more strongly attracted by the positive charge.

2. Effective nuclear charge: After the first ionization, the sodium ion (Na+) has one less electron, leading to an increased effective nuclear charge for the remaining electrons. This means that the positive charge in the nucleus has a stronger hold on the remaining electrons, making it harder to remove the next electron.

3. Electron shielding: The first electron to be removed from a sodium atom is from the outermost energy level (3s1). After this electron is removed, the electron shielding effect of the inner energy levels becomes more significant for the remaining electrons, further increasing the ionization energy.

In conclusion, the second ionization energy for Na+ is disproportionately larger than the first ionization energy due to the electron being removed from a closer energy level to the nucleus, the increased effective nuclear charge, and the stronger electron shielding effect.

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I understand that you need help with a question involving amoxicillin, milliliters, and dosage calculation. To prepare 165mg/5ml dose of amoxicillin from 250mg/5ml you need to follow the given steps ;

Step 1: Determine the concentration of amoxicillin needed.
The doctor orders a concentration of 165 mg/5 ml.

Step 2: Determine the concentration of amoxicillin available.
You have amoxicillin 250 mg/5 ml.

Step 3: Calculate the amount of amoxicillin in the available solution.
(100 ml) * (250 mg/5 ml) = 5000 mg

Step 4: Calculate the amount of amoxicillin needed in the desired concentration.
(5000 mg) * (165 mg/250 mg) = 3300 mg

Step 5: Calculate the volume needed for the desired concentration.
(3300 mg) / (165 mg/5 ml) = 100 ml

Since the volume needed for the desired concentration is the same as the total volume of the available solution, no additional milliliters need to be added.

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The reaction between aldehydes/ketones and HCN forms cyanohydrins, which have both a hydroxyl and a nitrile group attached to the same carbon atom.

When aldehydes and ketones react with hydrogen cyanide (HCN), the reaction leads to the formation of a new molecule called a cyanohydrin. The reaction proceeds through the nucleophilic addition of the cyanide ion (CN-) to the carbonyl group (C=O) present in the aldehyde or ketone, resulting in the formation of a new C-C bond. The intermediate formed is then attacked by water (H2O) to form the final product, the cyanohydrin. The resulting cyanohydrin molecule contains both a hydroxyl group (OH) and a nitrile group (CN) attached to the same carbon atom. The formation of cyanohydrins is an important chemical transformation, as they are useful intermediates in the synthesis of a variety of chemicals, including pharmaceuticals, flavors, and polymers. However, the reaction must be carried out with caution, as hydrogen cyanide (HCN) is a highly toxic gas.

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The use of CFCs (chlorofluorocarbons) in refrigerators has a harmful effect on our atmosphere, particularly on the ozone layer.

CFCs are synthetic chemicals that were commonly used in refrigerators, air conditioners, and aerosol sprays until the 1980s when their harmful effects on the environment were discovered. When CFCs are released into the atmosphere, they rise up to the stratosphere, where they interact with ozone molecules and break them apart. This process depletes the ozone layer, which is important for protecting the earth from harmful UV radiation.

The depletion of the ozone layer can result in a range of negative effects, including increased skin cancer rates, damage to crops and ecosystems, and disruptions to the marine food chain. In addition to their effects on the ozone layer, CFCs are also potent greenhouse gases that contribute to climate change.

To address these issues, the production and use of CFCs have been largely phased out through international agreements such as the Montreal Protocol. Today, alternative refrigerants that are less harmful to the environment, such as HFCs (hydrofluorocarbons), are widely used in refrigeration and air conditioning systems.

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The enzyme released from the kidney in response to hypotension is renin.

Renin is an enzyme released by the juxtaglomerular cells in the kidney in response to a decrease in blood pressure or blood volume. It is an important component of the renin-angiotensin-aldosterone system, which helps regulate blood pressure and fluid balance in the body.

                                     The enzyme released from the kidney in response to hypotension is renin. When there is a decrease in blood pressure, the kidneys release renin to help restore normal blood pressure levels. Renin initiates a series of reactions in the renin-angiotensin-aldosterone system, ultimately leading to increased blood volume and blood pressure.

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The ratio of C2H3O2⁻/HC2H3O2 that we need to use is 0.25. The answer is C) 0.25.

To determine the correct ratio of C2H3O2⁻/HC2H3O2 for your buffer with a pH of 4.14 and a pKa of 4.74, you can use the Henderson-Hasselbalch equation:

[tex]pH = pKa + log ([C2H3O2⁻]/[HC2H3O2])[/tex]
Plugging in the given values and rearrange the equation to solve for the ratio:

[tex]log ([C2H3O2\textsuperscript{-}]/[HC2H3O2]) = 4.14 - 4.74\\log ([C2H3O2\textsuperscript{-}]/[HC2H3O2]) = -0.60[/tex]
Then, find the antilog:

[tex][C2H3O2\textsuperscript{-}]/[HC2H3O2] = 10^(-0.60)[C2H3O2\textsuperscript{-}]/[HC2H3O2] ≈ 0.25[/tex]

Therefore, the correct answer is C) 0.25.

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Answer:

2

Explanation:

this would dissociate into OH- ions, so it would definitely be more than H+ ions. it is also an electrolyte because it is an ion.

When considering the interconversion between one chair conformation to another, the kind of groups that will slow this process down is large, bulky substituents attached to the molecule. These bulky groups will generally favor an equatorial position rather than an axial position on the cyclohexane ring.

These groups will hinder the interconversion due to steric hindrance, which refers to the increased energy needed to accommodate the large groups during the conformational change. The equatorial position is favored because it minimizes steric hindrance and results in lower energy conformations. In the equatorial position, the large groups are further apart from the other substituents, reducing the chances of unfavorable interactions and allowing the molecule to achieve a more stable conformation.

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You can expect brown fat to increase heat production because it contains a protein that acts like DNP.

Brown fat would increase heat production because the protein it contains acts like dnp, which uncouples oxidative phosphorylation in mitochondria, leading to an increase in the rate of energy expenditure and heat generation. This mechanism is especially important for small hibernating animals and infants, who need to maintain their body temperature in cold environments.

Brown fat, found in small, hibernating animals and infants, has a protein that acts like DNP (2,4-Dinitrophenol). This protein allows brown fat to generate heat by uncoupling oxidative phosphorylation in the mitochondria. This process leads to an increase in heat production as energy from the food is released as heat instead of being used to produce ATP. Consequently, brown fat helps maintain body temperature in these animals and infants.

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Increase in oxidation state is usually accompanied by the increase of bonds to oxygen or other electronegative elements. Reduction refers to a decrease in oxidation state .

Oxidation is a process whereby a molecule loses electrons (e-) or energy to become positively charged.

Oxidation changes the oxidation number of the molecule involved depending on the number of electrons lost.

Reduction is the opposite of oxidation, and it entails gain of electrons and energy by a molecule. Together, they are called oxidation-reduction or redox reaction.

Reduction refers to a decrease in oxidation state or a gain in electrons. A decrease in oxidation state (reduction) is accompanied by an increase of bonds to hydrogen or other electropositive elements.

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The oven was preheated to a constant temperature and heated for a total of 34.3 minutes to reach a temperature of 140°F. To determine the temperature of the oven, we need to use the readings from the thermometer and the time it took for the temperature to change.

Here is a step by step explanation:

Therefore, the oven was preheated to a constant temperature and heated for a total of 34.3 minutes to reach a temperature of 140°F.

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The limiting reagent in the reaction is  salicylic acid as shown in the below section.

When 1 mole of acetic anhydride reacts with 1 moles of salicylic acid, it produces 1 mole  of aspirin.

The mass of acetic anhydride can be calculated as-

Density = Mass/ volume

1.082 g/ mL = Mass / 0.350 mL

Mass = 1.082 g/mL x 0.350 mL

         = 0.3787 g

Since, the mass of salicylic acid is 0.150 g which is less than that of acetic anhydride. Thus the former behaves as a limiting reagent.

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True, MO theory explains the bonding in molecules by considering the overlapping of atomic orbitals to form molecular orbitals, which can account for the delocalization of electrons in polyatomic molecules without the need for resonance structures.

The statement "MO theory eliminates the need for resonance forms to depict polyatomic molecules" .
Molecular Orbital (MO) theory provides a more accurate representation of polyatomic molecules by considering the electron distribution in molecular orbitals, which are formed from the combination of atomic orbitals.

                                   This approach helps visualize the electron distribution throughout the entire molecule rather than focusing on individual bonds, thus eliminating the need for resonance forms.

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The concentration of Pb2+ in the solution is approximately 0.19 mol/L.

To answer this question, we need to use the solubility product constant (Ksp) for lead chloride. The equation for the reaction is:

PbCl2(s) ⇌ Pb2+(aq) + 2Cl-(aq)

The Ksp expression is:

Ksp = [Pb2+][Cl-]^2

When a precipitate starts to form, the solution has reached the saturation point, which means that the product of the ion concentrations is equal to the Ksp. Therefore, we can set up the following equation:

Ksp = [Pb2+][Cl-]^2 = (x)(0.25)^2

Where x is the concentration of Pb2+ in mol/L. Solving for x, we get:

x = Ksp / [Cl-]^2 = (1.17 x 10^-5) / (0.25)^2

x ≈ 0.19 mol/L

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Answer: To determine the number of moles of AgNO3 needed to prepare a 2.3 M solution in 452 mL, we can use the formula:

moles = concentration (M) x volume (L)

First, we need to convert the volume from milliliters to liters by dividing by 1000:

452 mL ÷ 1000 mL/L = 0.452 L

Next, we can plug in the values we know:

moles = 2.3 M x 0.452 L

moles = 1.0416

Therefore, we need 1.0416 moles of AgNO3 to prepare a 2.3 M solution in 452 mL.

The role of n-bromosuccinimide (NBS) in this experiment is to selectively brominate the double bonds in the molecule being tested.

NBS is a selective brominating agent that can be used to brominate the double bonds in organic molecules. In this experiment, NBS is added to the reaction mixture along with the molecule being tested. The NBS selectively adds a bromine atom to each double bond in the molecule, forming a dibromo product. This reaction is useful in synthesizing specific compounds and studying the reactivity of double bonds in organic molecules.

N-bromosuccinimide serves as a convenient source of bromine atoms, which allows it to brominate various substrates, such as alkenes or allylic positions in organic compounds.

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There are 3 weak acids out of the 4 listed: [tex]HNO_{2}[/tex], HClO, [tex]H_{2}PO_{4} ^{-}[/tex]. Therefore, the answer is C) 3.

A weak acid is an acid that does not completely dissociate into ions when it is dissolved in water. It partially dissociates and produces a reversible reaction.

Out of the given compounds, the weak acids are:

1. [tex]HNO_{2}[/tex] (nitrous acid) is a weak acid because it only partially dissociates in water.
2. HClO (hypochlorous acid) is also a weak acid as it doesn't dissociate completely in water.
3. [tex]HNO_{3}[/tex] (nitric acid) is a strong acid, meaning it fully dissociates in water.
4.  [tex]H_{2}PO_{4} ^{-}[/tex] (dihydrogen phosphate ion) is a weak acid as it doesn't fully dissociate in water.

Out of the four given acids, three are weak acids.

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