what is the volume of oxygen gas at stp from the decomposition of 10.8 g of mercuric oxide (216.59 g/mol)?

Heat required = = 126.42 kJ

Given

1.96 mol NaHCO₃(s)

Required

Heat needed

Solution

Reaction( decomposition of Baking soda (NaHCO₃) :

2NaHCO₃ (s) + 129 kJ ⇒ Na₂CO₃ (s) + H₂O (g) + CO₂ (g)

For 2 mol NaHCO₃ , heat needed = 129 kJ

conversion factor :

\(\tt \dfrac{129~kJ}{2~mol}\)

So for 1.96 mol :

= 1.96 mol x (129 kJ/2 mol)

= 126.42 kJ

The balanced reaction of this chemical reaction is as follows :

• As we can see, this is a double-displament reaction

Answer:

127,236 kj of heat

Explanation:

This is the final answer

Since hydrogen peroxide is both acidic and basic, it serves as both an oxidizing and a reducing agent.

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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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Potassium-40 is a radioactive material. It contains 19 protons and 21 neutrons. During the process of Potassium-40 decay, one of its 21 neutrons becomes a proton and an electron is formed in the process. The correct options that apply:

A) The mass number is changed by the decay of Potassium-40.

B) After decay, the atom is not Potassium.

A) The mass number is changed by the decay of Potassium-40.

During the decay of Potassium-40, one of its 21 neutrons is converted into a proton. Since the mass number is the sum of protons and neutrons in an atom, this conversion changes the composition of the nucleus and, consequently, the mass number of the atom.

B) After decay, the atom is not Potassium.

The conversion of a neutron into a proton during decay changes the atomic number of the atom. Potassium has an atomic number of 19, but the resulting atom, after the decay, will have an atomic number of 20. Therefore, the atom is no longer potassium but a different element.

C) The mass number is unchanged by the decay of Potassium-40.

As explained in statement A, the decay of Potassium-40 involves the conversion of a neutron into a proton. This changes the composition of the nucleus and, consequently, the mass number of the atom.

D) After decay, the atom is still Potassium.

As discussed in statement B, the conversion of a neutron into a proton during decay changes the atomic number of the atom. Since the atomic number defines the identity of the element, the resulting atom after the decay is no longer potassium.

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The complete question is:

Potassium-40 is a radioactive material. It contains 19 protons and 21 neutrons. During the process of Potassium-40 decay, one of its 21 neutrons becomes a proton and an electron is formed in the process. Select all that apply.

A) The mass number is changed by the decay of Potassium-40.

B) After decay the atom is not Potassium.

C) The mass number is unchanged by the decay of Potassium-40.

D) After decay the atom is still Potassium.

The Ka : 1.671 x 10⁻⁷

Given

Reaction

HA (aq) + H2O (l) ←→ A- (aq) + H3O+ (aq).

0.3 M HA

pH = 3.65

Required

Ka

Solution

pH = - log [H3O+]

\(\tt [H_3O^+]=10^{-3.65}=2.239\times 10^{-4}\)

ICE method :

HA (aq)        ←→   A- (aq)    +    H3O+ (aq).

0.3                           0                 0

2.239.10⁻⁴           2.239.10⁻⁴   2.239.10⁻⁴

0.3-2.239.10⁻⁴    2.239.10⁻⁴    2.239.10⁻⁴

\(\tt Ka=\dfrac{[H_3O^+][A^-]}{[HA]}\\\\Ka=\dfrac{(2.239.10^{-4}){^2}}{0.3-2.239.10^{-4}}\\\\Ka=1.671\times 10^{-7}\)

Answer:

It heats up.

Explanation:

Because thermal energy is based off the temperature of an object and the average kinetic energy of its particles increases. When the average kinetic energy of its particles increases, the object's thermal energy increases. Therefore, the thermal energy of an object increases as its temperature increase.

Yes, all of the above characteristics apply to an atomic orbital.

Atomic orbitals are defined by the wave function, which describes the probability of the electron being in a certain region of space. They are identified by a unique combination of three quantum numbers, which are the principal quantum number (n), the angular momentum number (l), and the magnetic quantum number (m).

These three quantum numbers give information about the size and shape of the orbital. Atomic orbitals are also a region around the nucleus of an atom where the probability of finding an electron is high.

In addition, they are shells in an atom containing valence electrons and can be identified by a unique combination of four quantum numbers, which are the same three quantum numbers mentioned above plus the spin quantum number (s).

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Pollution levels in cities are generally highest in urban areas or city centers.

This can be attributed to several factors;

High population density; Cities tend to have a dense population, with a concentration of residential, commercial, and industrial activities. The presence of a large number of people, vehicles, and industries increases the overall emissions of pollutants into the environment.

Industrial and vehicular emissions; Urban areas often host numerous industrial facilities and a high volume of traffic. Industrial activities release pollutants such as particulate matter, volatile organic compounds (VOCs), and various gases. Vehicles contribute to air pollution through the emission of exhaust gases, including nitrogen oxides (NOx) and carbon monoxide (CO).

Energy consumption; Cities have high energy demands for electricity, heating, and cooling, which often rely on the burning of fossil fuels. Fossil fuel combustion releases pollutants such as sulfur dioxide (SO₂), nitrogen oxides (NOx), and greenhouse gases like carbon dioxide (CO₂).

Lack of green spaces; Urban environments typically have limited green spaces, such as parks and trees, which play a crucial role in absorbing pollutants and improving air quality. The absence of such natural elements can contribute to higher pollutant levels in cities.

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pollutant levels in cities are generally highest in areas with significant industrial activities, high population density, unfavorable geographical locations, and certain weather conditions.

pollutant levels in cities can be influenced by various factors. industrial activities, such as factories and power plants, release pollutants into the air, contributing to higher pollutant levels. vehicular emissions from cars, trucks, and buses also play a significant role in increasing pollutant levels.

Cities with high population density tend to have more sources of pollution, leading to higher pollutant levels. The concentration of people and their activities can result in increased emissions from various sources.

geographical location is another factor that can impact pollutant levels. Cities located near industrial areas may experience higher pollution due to the proximity of factories and other industrial facilities. Additionally, cities with unfavorable wind patterns may have difficulty dispersing pollutants, leading to higher pollutant levels.

weather conditions also play a role in pollutant levels. Temperature inversions, where a layer of warm air traps pollutants close to the ground, can result in higher pollutant concentrations. Stagnant air can also prevent the dispersion of pollutants, further contributing to higher levels in cities.

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There are multiple ways to prevent these situations from occurring. The three most common protective devices are fuses, circuit breakers, and surge protectors

Explanation:

Answer:

4.43 g

Explanation:

The reaction between sodium chloride and flourine gas is given as;

NaCl + F2 --> NaF + Cl2

From the stochiometry of the equation;

1 mol of NaCl reacts eith 1 mol of F2 to form 1 mol of NaF and Cl2

Mass of 1 mol of F2 = 38g

Mass of 1 mol of sodium flouride, NaF = 42g

This means 38g of flourine reacted with NaCl to form 42g of NaF

xg of F2 would form 4.9g of NaF

38 = 42

x = 4.9

x = 4.9 * 38 / 42

x = 4.43 g

Answer:

there are 4

Explanation:

The electronic configuration of an element represent the filling of electrons in various orbitals or subshells. The configuration of the element neon is 1s² 2s² 2p⁶.

Neon is 10th element in periodic table. It is a noble gas also called an inert gas since the inert gas group that is group 18 gases are commonly unreactive. The group members are neon, argon, krypton, xenon and radon.

The elements in group 18 have the general electronic configuration for valence electrons ns² np⁶. Therefore, they have a completely filled orbital and attained octet which means they are all highly stable.

Neon have 10 electrons and these electrons are arranged in orbitals in the increasing order of energy levels. Thus its electronic configuration is 1s² 2s² 2p⁶.

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Answer:  The best answer is "The solute particles are carried into solution."  

Explanation:  I saw "best" because I don't know how to interpret "carried into solution."  Does this refer to some micro-critter putting them into wheelbarrows?  But it is better than the other options.  Water (the solvent particles) are all polar.  The solute (stuff being dissolved) DOES have an attraction for the solvebt (water), since water is also polar.  The solute particles are very different:  possible, but irrwelevant.  As long as they are polar, I don't care what they look like.

None of the statements are true about dissolving a polar substance in water.

When a polar substance is dissolved in water, the solute particles get surrounded by the water molecules to form hydration shells because of strong electrostatic interactions between the polar solute and polar water molecules. This process is called solvation or hydration.

The dissolution of a polar substance in water breaks the intermolecular forces within the solute particles that leads to the development of new  forces between the solute and solvent particles.

However, the solute particles have attraction for the solvent molecules. Water being a polar solvent dissolves only polar compounds, but not dissolve nonpolar compounds because of lack of strong interactions between nonpolar molecules and water to overcome the cohesive forces among nonpolar molecules.

Therefore, none of the statements are true about dissolving a polar substance in water.

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The Global warming potentials of nitrous oxide and chlorofluorocarbons is B. Nitrous oxide has a higher global warming potential than chlorofluorocarbons due to anthropogenic compounds from burning of fossil fuels.

Chlorofluorocarbon has a higher global warming potential than nitrous oxide due to anthropogenic compounds from air conditioning, aerosol, and refrigerants. Nitrous oxide and chlorofluorocarbons are both greenhouse gases that contribute to global warming. Their global warming potential is measured by comparing them to the same amount of carbon dioxide over a specific period of time. Nitrous oxide has a higher global warming potential than chlorofluorocarbons due to the anthropogenic compounds produced from burning fossil fuels.

The combustion of fossil fuels releases nitrogen compounds that are converted into nitrous oxide. Chlorofluorocarbon has a higher global warming potential than nitrous oxide due to the anthropogenic compounds produced from air conditioning, aerosol, and refrigerants. These compounds break down and release the chlorofluorocarbon into the atmosphere. So therefore the correct answer is B. Nitrous oxide has a higher global warming potential than chlorofluorocarbons due to anthropogenic compounds from burning of fossil fuels.

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221.71g of Na₂S is needed to get a sample of 2.84mol of Na₂S.

The correct answer is option d.222g

To determine the grams of a 2.84 mol sample of Na₂S, you need to convert moles to grams using the molecular weight of Na₂S. The molecular weight of Na₂S is (22.99 g/mol × 2) + (32.06 g/mol) = 78.04 g/mol.

To find the grams, multiply the moles (2.84) by the molecular weight (78.04 g/mol):

2.84 mol × 78.04 g/mol = 221.71 g

Therefore, if you need a 2.84 mol sample of Na₂S, you will need 221.71 g (rounded to 222 g). The correct answer is d. 222 g.

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Answer:

beesechurger

Explanation:

Answer:B

Explanation:

Answer:

it will float if the object is 1g/cm^3(water 's density ) because it is less dense

A liquid with stronger intermolecular forces will have a lower vapor pressure at a given temperature and thus a higher boiling point.

The concentration of SO₄⁻² that remains in the solution will be 0.174 M

Volume of KOH = 114 ml

Volume of NiSO₄ = 260 ml

Molarity of KOH = 0.190 M

Molarity of NiSO₄ = 0.250 M

Concentration of SO₄⁻² = ?

    NiSO₄ (aq)  ⇆  Ni⁺² (aq) + SO₄⁻² (aq)

Calculate the number of moles (n) of SO₄⁻² in 260 ml solution

    number of moles (n) of SO₄⁻² = 0.250 × 260 ml / 1000 ml

    number of moles (n) of SO₄⁻² = 0.065 mol

    total volume = 114 ml + 260 ml

    total volume = 374 ml

Now calculate the concentration of SO₄⁻²

    concentration of SO₄⁻² = number of moles × 1000 / volume (ml)

    concentration of SO₄⁻² = 0.065 × 1000 / 374

    concentration of SO₄⁻² = 0.174 M

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Answer:

Radiometric dating

Explanation:

Radiometric dating would be the most effective way since it is a technique that can establish the age of objects older than a few thousand years.

During cellular respiration, Kristine's cells undergo a series of metabolic processes to convert nutrients, such as glucose, into usable energy in the form of adenosine triphosphate (ATP). The cells extract energy from the nutrients and transfer it to ATP through a complex biochemical pathway.

First, glycolysis occurs in the cytoplasm, where glucose is broken down into two molecules of pyruvate. This process generates a small amount of ATP and high-energy electron carriers, such as NADH.

Next, if oxygen is present, the pyruvate molecules enter the mitochondria for further processing. The pyruvate is converted into acetyl-CoA, which enters the citric acid cycle (also known as the Krebs cycle). In the citric acid cycle, acetyl-CoA is further broken down, releasing more ATP, NADH, and FADH2, along with carbon dioxide as a byproduct.

The high-energy electron carriers (NADH and FADH2) produced in glycolysis and the citric acid cycle are then used in the electron transport chain, which occurs in the inner mitochondrial membrane. The electron transport chain transfers electrons from NADH and FADH2 to generate a large amount of ATP through oxidative phosphorylation.

Overall, cellular respiration allows Kristine's cells to efficiently extract energy from nutrients, enabling her to have the necessary energy for physical activities like running on the treadmill and lifting weights.

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Answer:

billion is larger \ part if billion

Answer:

For these problems, we need to compare the theoretical yield that we'd get from performing stoichiometry to the actual yield stated in the problem. % yield is the actual yield/theoretical yield x 100%  

Cu + 2 AgNO₠→ Cu(NOâ‚)â‚‚ + 2 Ag ==> each mole of copper yields two moles of silver  

12.7-g Cu x ( 1 mol Cu /63.5-g Cu) x ( 2 mol Ag / 1 mol Cu) x (108-g Ag / 1 mol Ag) = 43.2-g Ag. This is the theoretical yield. Now, since we got 38.1-g Ag our % yield is:  

38.1-g/43.2-g x 100% = 88.2%

Explanation:

Answer:

True

Explanation:

Answer:

Nickle

Explanation:

Nickel is one of only four metals that are ferromagnetic, meaning they are attracted to magnets and are magnetic themselves

Answer:

The first answer is wrong, it's actually Potassium.

Explanation:

Just saying