what mass of sodium phosphate would have to be added to 2.0 l of this solution to completely eliminate the hard water ions? assume complete reaction.

The decay of Pb by emitting a β− particle results in the production of Bi. β− decay is a process in which an atomic nucleus emits an electron (β− particle) and transforms into a different nucleus.

In the case of Pb, it undergoes β− decay to become Bi. The equation representing this decay process is:

\(\[^{210}\textrm{Pb} \rightarrow \,^{210}\textrm{Bi} + e^{-}\]\)

In this equation, the superscripts represent the mass numbers of the nuclides, while the subscripts represent their atomic numbers. Pb has a mass number of 210, and during the decay process, it emits a β− particle and transforms into Bi, which also has a mass number of 210. The emitted β− particle carries away excess energy and atomic charge to maintain the balance in the decay process.

Overall, when Pb undergoes β− decay, it transforms into Bi by emitting an electron (β− particle). This process helps stabilize the nucleus and leads to the formation of a new nuclide.

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Answer: Around 97% of water on Earth is salt water

Explanation:

around 97% is salt water and 3% is fresh water

In the asthenosphere, density and temperature are the primary contributors to convection currents.

What exactly is the Earth's asthenosphere?

The weaker, denser layer below the lithospheric mantle is known as the asthenosphere. It is between 62 miles and 410 kilometers (100 miles) below the surface of the Earth. Because of the asthenosphere's extreme heat and pressure, rocks begin to weaken and partially melt, turning semi-molten.

What is the short definition of the asthenosphere?

Located under the lithosphere, the asthenosphere is a region of the Earth's mantle that is thought to be significantly hotter and more fluid than the lithosphere. Between 100 km (60 miles) and 700 km (450 miles) below the surface of the Earth is the asthenosphere.

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Air and water pollution are serious environmental issues that have a negative impact on human health and the environment. Practical solutions can be implemented to reduce pollution levels and improve the overall quality of life.

To reduce air pollution, steps such as increasing public transportation usage, promoting renewable energy sources, enforcing stricter emission standards on vehicles and factories, and reducing waste production can be taken.

Planting trees and creating green spaces can also help reduce air pollution by absorbing carbon dioxide and other pollutants from the air.

To reduce water pollution, implementing proper waste disposal and treatment methods, reducing the usage of chemicals in households and industries, and enforcing stricter regulations on agricultural practices can be effective.

Regularly maintaining septic tanks and limiting the usage of pesticides and fertilizers can also help reduce water pollution.

Education and awareness campaigns can be launched to educate individuals on the importance of environmental conservation and pollution reduction.

These campaigns can promote environmentally friendly practices and encourage individuals to take action to reduce pollution levels. By implementing these practical solutions, we can take steps towards a cleaner and healthier environment.

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Answer:

i think it would 40

Explanation:

The hybridization on the S atom in SF6 is sp3d2.

In order to determine the hybridization on the S atom in SF6, we first need to draw the Lewis structure for SF6. The Lewis structure shows that the S atom is surrounded by 6 fluorine atoms, each of which is bonded to the S atom. There are no lone pairs on the S atom.

To determine the hybridization on the S atom, we need to count the number of electron groups (bonded atoms and lone pairs) around the S atom. In this case, there are 6 electron groups around the S atom. We then use the formula for hybridization, which is:

hybridization = number of electron groups

For SF6, the hybridization on the S atom is:

hybridization = 6

Therefore, the hybridization on the S atom in SF6 is sp3d2.

The hybridization on the S atom in SF6 is sp3d2, which means that the S atom is surrounded by six electron groups, including five hybrid orbitals and one unhybridized p orbital.

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The substance with the highest melting point among the given choices should be CO.

The melting point of a substance depends on its intermolecular forces, which are the forces that hold its molecules together. Generally, the stronger the intermolecular forces, the higher the melting point of the substance.

Among the given choices, CO has both London dispersion forces and dipole-dipole interactions, while Ne, N2, and Xe only have London dispersion forces. Dipole-dipole interactions are generally stronger than London dispersion forces.

Therefore, CO should have the highest melting point among the given substances because it has stronger intermolecular forces than the other covalent molecules.

In summary, the substance with the highest melting point among the given choices should be CO.

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Answer:

All of the energy from the Sun that reaches the Earth arrives as solar radiation, part of a large collection of energy called the electromagnetic radiation spectrum. Solar radiation includes visible light, ultraviolet light, infrared, radio waves, X-rays, and gamma rays.

Explanation:

The pressure that the gas exerts at the higher temperature would be 20.83 atm.

According to Gay-Lussac's law, the pressure that a gas will exert on its container is directly proportional to the temperature of the gas, provided that the volume remains constant throughout.

This law can be mathematically expressed as:

\(p_1/t_1 = p_2/t_2\)

Where:

In this case, the initial temperature is given as 18 \(^oC\), the initial pressure is given as 2.5 atm, and the final temperature is given as 150 \(^oC\), We are to find the final pressure.

\(p_2\) = \(p_1t_2/t_1\)

   = 2.5x150/18

   = 20.83 atm

In other words, the new pressure that the gas will exert at a temperature of 150 \(^oC\) would be 20.83 atm.

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The following ionization energies apply to beryllium:

e1=899.5 kj/mol

1757.1 kj/mol for ei2

14,848 kj/mol for ei3.

21,006 kj/mol for ei4.

We must examine the pattern and properties of the ionization energies in order to identify the element using the provided ionization energy data. On the periodic chart, ionization energies typically rise as we move between periods and fall as we move down groups.

The loss of a valence electron is indicated by the considerable rise in ionization energy from the first to the second ionization energy (578 kj/mol to 1.817 kj/mol), as can be seen from the supplied numbers. The sudden increase in ionization energy indicates that the element belongs to Group 2 (Group IIA) of the periodic table, where valence electrons are frequently found in pairs.

With the use of this knowledge, we may limit our search to elements in Group 2 of the periodic table. Beryllium (Be) is the sole element in Group 2 that corresponds to the given ionization energy values. The following ionization energies apply to beryllium:

e1=899.5 kj/mol

1757.1 kj/mol for ei2

14,848 kj/mol for ei3.

21,006 kj/mol for ei4.

It is likely that the element indicated in the question is an approximation or that there are additional factors affecting the ionization energies as the given ionization energy values do not exactly match those of Beryllium.

As a result, it is impossible to establish the element with certainty using the available data.

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Answer:

the wave model of light is useful for explaining brightness, color, and the frequency-dependent bending of light at a surface between media. For example, students could observe some of the wave behaviors or light by observing that when light passes through a small opening the waves spread out. They could observe that if the wavelength is short, the waves spread out very little, whereas longer wavelengths spread out more

Explanation:

In this reaction the oxidation number of hydrogen increases that is oxidation of hydrogen and the reduction of Copper occurs.

Any chemical process in which a participating chemical species' oxidation number changes is an oxidation-reduction reaction, often known as a redox reaction.

It is also clear that this is a reduction reaction because the oxidation number for copper decreases from +2 in Cu2+ to 0 in copper. Since oxidation involves the loss of electrons, 2H2O is oxidized when it loses 4 electrons to create O2.

The given reaction is :

CuO + H₂ = Cu + H₂O

in this reaction the oxidation number of hydrogen increases that is oxidation of hydrogen and the reduction of Cu occurs.

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At atmospheric pressure and 120 K, Xe is a liquid, whereas Ar is a gas at the same circumstances.

The right response is B.

Intermolecular forces can be divided into three categories: hydrogen bonds, dipole-dipole interactions, and London dispersion forces (LDF). Despite the fact that molecules can have any combination of these three types of intermolecular forces, all substances at least contain LDF.

These are the four principal intermolecular forces: Van der Waals dipole-dipole interactions > Ionic bonds > Hydrogen bonds > forces of Van der Waals dispersion.

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Answer:

pH = 12.6

Explanation:

The HF reacts with LiOH as follows:

HF + LiOH → LiF + H₂O

To solve this question we need to find the moles of each reactant:

Moles HF:

0.1500L * (0.20mol / L) = 0.030 moles HF

Moles LiOH:

0.600L * (0.10mol / L) = 0.060 moles LiOH

That means there is an amount of LiOH in excess, that is:

0.060 mol - 0.030 mol = 0.030 moles LiOH

In 600.0mL + 150.0mL = 750.0mL = 0.750L

The molarity of LiOH is:

0.030 moles LiOH / 0.750L =

0.040M LiOH = [OH⁻]

As:

Kw = 1x10⁻¹⁴ = [H⁺] [OH⁻]

1x10⁻¹⁴ = [H⁺] [0.040M]

2.5x10⁻¹³M = [H⁺]

As pH = -log [H⁺]

Answer:

salt i know the answer and even sugar is

Answer:

what is this question??

Answer:3,888,000seconds

Explanation:

60secx60minsx24 hoursx45days=3,888,000

For the first question, the rate will increase by 27 times if you triple the concentration of both A and B.

For the second question, the units of the rate constant, k, are M-3/2 s -1.

In reaction (1);

Rate law: A + B → C

Rate =k[A][B] 2

Here the rate law is proportional to the concentration of A and B raised to the power of 2, so if you triple both concentrations, the overall rate will be proportional to:

Rate  = k (3A) (3B)2 = 27k[A][B].

Therefore, the rate will increase by 27 times.

For reaction (2):

Rate law: A + B → C

Rate = k[A] 1/2 [B] 2

Here the rate law is proportional to [A]^(1/2)[B]^2.

So the units of k must be (M^(-1/2))(s^(-1)) to cancel out the units of [A]^(1/2) and (M^(-5/2))(s^(-1)) to cancel out the units of [B]^2.

Multiplying these units together gives M^(-3/2)s^(-1).

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Explanation:

Mass and volume are two units used to measure objects. Mass is the amount of matter an object contains, while volume is how much space it takes up.

Example: A bowling ball and a basketball are about the same volume as each other, but the bowling ball has much more mass.

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Answer:

187 moles NH₃

Explanation:

To find the amount of ammonia formed, you need to multiply the given value by the mole-to-mole ratio consisting of both relevant molecules. The mole-to-mole ratio is made up of the molecules' coefficients in the balanced equation. The desired unit should be placed in the numerator of the ratio. The final answer should have 3 sig figs to reflect the lowest amount of sig figs among the given values.

1 N₂ + 3 H₂ ----> 2 NH₃
^                         ^

93.5 moles N₂          2 moles NH₃
----------------------  x  -------------------------  =  187 moles NH₃
                                    1 mole N₂

Based on the data and Florence's observations, Florence has observed a chemical change. 2Na2S2O3 + I2 ----> Na2S4O6 + 2NaI.

A chemical reactions is the transformation of one substance into another, the emergence of new compounds with distinct properties, or any combination of these.It happens when two substances mix to create a new material.

A carrot being chopped up or ice dissolving into water are two examples of physical changes.Chemical transformations occur when two or more components are mixed to create a brand-new compound.You have such a new material after a chemical transformation.A chemical change might occur when burning paper or when baking a cake.

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Answer:

monkey

Explanation:

cause that's what u r

1. The gas whose concentration decreases when pCO2 levels increase in order to maintain oxygen levels is nitrogen.

2. Minute ventilation is the total volume of air that is breathed in and out in one minute.

3. CO2 and pH have a direct relationship that affects minute ventilation.

4. Inhaling increased amounts of CO2 can affect pulmonary ventilation in a number of ways. The increased levels of CO2 can cause the respiratory rate to increase, leading to hyperventilation.

1. The gas whose concentration decreases when pCO2 levels increase in order to maintain oxygen levels is nitrogen. As the amount of CO2 in blood increases, the body compensates by decreasing the concentration of nitrogen gas in the inhaled air.

2. Minute ventilation is the total volume of air that is breathed in and out in one minute. When inhaled air contains 5% carbon dioxide, minute ventilation will increase to help remove the excess carbon dioxide from the body.

3. CO2 and pH have a direct relationship that affects minute ventilation. When CO2 levels increase, the pH decreases and causes the respiratory rate to increase. This increased ventilation helps to remove excess CO2 and restore the pH balance.

4. Inhaling increased amounts of CO2 can affect pulmonary ventilation in a number of ways. The increased levels of CO2 can cause the respiratory rate to increase, leading to hyperventilation. This can cause dizziness, shortness of breath, and other symptoms. Additionally, it can lead to respiratory acidosis if the body is unable to compensate for the increased CO2 levels.

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The mystery element that remains solid at room temperature and also breaks very easily is a :  Non-metal  ( B )

A non metal is non conducting element at room temperature, which can be in gas, sold and liquid forms at room temperature, when in solid form they can break easily and do not bend as well. Non-metals are poor conductors of heat and electricity therefore will not conduct electricity when placed in a circuit. An example of a solid non-metal is Carbon.

Hence we can conclude that the mystery element is a Non-metal

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Density (ρ) = 835 kilogram/cubic meter

Steps:

ρ =  

m

V

=  

83.5 gram

100 milliliter

=  0.835 gram/milliliter

=  835 kilogram/cubic meter

Explanation:

Matter is the basic unit of all things in the world, whether living or nonliving. It is not only useful in chemistry, but also to other fields of science like physics. Physics deals with motion, so it has something to do with matte especially the movement of molecules for solids and fluids.

Answer: (d) 59.25%

Explanation: :D

Answer:

When you are going to measure small lengths or objects or when you are going to measure things with great accuracy.

Explanation:

A decomposition reaction is a chemical reaction in which one reactant breaks down into two or more products.

A metathesis reaction is a chemical reaction in which the positive ions and negative ions present in the reactants appear to exchange partners.