What is the concentration of Pb2 at equilibrium if the Ksp of PbCl2 equals 1.8 x 10-5 in an aqueous solution of pure water

Explanation:

When chlorine bonds and becomes stable, (had a full outer electron shell), because we know that chlorine has 7 electrons in it’s outer shell, it requires 1 to gain noble gas structure. So, when if bonds with an element and then becomes stable, the gaining of an electron means it becomes a negatively charged ion. (an ion being a charged particle.)

We would need to know the concentration , volume and moles of hydrogen peroxide in order to determine the stoichometry .

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Answer:

Differentiated below

Explanation:

- Stream load is defined as the quantity of solid matter that's carried by the erosion of the stream.

- Stream discharge is defined as the quantity (which is volume) of water that passes a given point for a particular amount of time.

- Stream Gradient is defined as the slope of the stream. This is basically expressed as:

Stream gradient = Change in elevation between two points on a stream ÷ actual distance between the two points where water actually flows.

The sum of oxidation numbers of the three Si atoms in k-feldspars (KAlSi3O8) is +12

The amount of electrons any atom or ion however has gained or lost in comparison to a neutral atom is known as the oxidation number / state of the atom or ion.

k-feldspars, molecular formulae KAlSi3O8

We know that -

Oxidation state of oxygen = -2

Oxidation state of Potassium = +1

Oxidation state of aluminum = +3

8 oxygens, each of them -2, = -16

1 potassium, +1

1 aluminum, +3

1 + 3 - 16 = -12

So the three silicon atoms need to make up +12 for the compound to be neutral.

12 / 3 = +4, so each silicon is +4.

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Answer:

carbon dioxide produced, or carbon monoxide, soot produced and Soot can cause breathing problems and it blackens buildings.

Explanation:

During complete combustion carbon and hydrogen combine with oxygen (O2) to produce carbon dioxide (CO2) and water (H2O). During incomplete combustion part of the carbon is not completely oxidized producing soot or carbon monoxide (CO).

Answer:

that's a difficult question

Explanation:

Sorry!!!!!

Larger molecules experience larger dispersion forces due to more distance of valance of electrons from the nucleus.

Larger atoms and molecules have stronger dispersion forces than smaller atoms and molecules because in a larger atom or molecule, the valence electrons are present farther from the nuclei than in a smaller molecule.

They are less tightly held to the nuclear charge present in the nucleus and can easily form temporary dipoles so we can conclude that larger molecules experience larger dispersion forces due to more distance of valance of electrons from the nucleus.

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Atmospheric gases can be liquefied by applying pressure and lowering temperature.

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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Answer:

b. the development of new vaccine prevents disease from spreading

Answer:

Explanation:

a i think

Answer:

it would (a)

Explanation:

carcinogen is a substance that gives your tissues a higher chance of getting cancer

Explanation:

The factor of matter are solubility, boiling point, melting point, temperature, density and reactivity

Answer:

To calculate the volume of oxygen that will be required to burn 300 liters of ethane containing 5.8% non-combustible impurities, we need to determine the amount of pure ethane present.

Since the ethane contains 5.8% non-combustible impurities, 100 - 5.8 = 94.2% of the 300 liters of ethane is pure and can be burned.

The amount of pure ethane is 94.2% * 300 liters = 282.6 liters.

The stoichiometric equation for the complete combustion of ethane is:

C2H6 + 7O2 -> 4H2O + 6CO2

This equation tells us that for every molecule of ethane that is burned, 7 molecules of oxygen are required.

The volume of oxygen required for burning 282.6 liters of ethane is 282.6 liters * 7 = 1989.2 liters.

So, the volume of oxygen that will be required to burn 300 liters of ethane containing 5.8% non-combustible impurities is 1989.2 liters.

Assuming that the non-combustible impurities have no effect on the combustion of ethane, we can calculate the volume of oxygen required to burn 300 liters of ethane as follows:

Write the balanced chemical equation for the combustion of ethane:

C2H6 + 3.5 O2 -> 2 CO2 + 3 H2O

Determine the stoichiometry of the reaction, which tells us the molar ratio of ethane to oxygen required for complete combustion. From the balanced equation, we see that 1 mole of ethane reacts with 3.5 moles of oxygen.

PV = nRT

where P is the pressure of the gas, V is the volume of the gas, n is the number of moles of gas, R is the gas constant, and T is the temperature of the gas. Assuming standard temperature and pressure (STP), which is 1 atm and 0°C, we have:

n = PV/RT = (1 atm * 300 L)/(0.08206 Latm/molK * 273 K) = 12.5 moles of ethane

3.5 moles of O2 are required for 1 mole of ethane, so for 12.5 moles of ethane, we need:

12.5 moles of ethane * 3.5 moles of O2/mole of ethane = 43.75 moles of O2

V = nRT/P = (43.75 mol * 0.08206 Latm/molK * 273 K)/1 atm = 994.8 L of O2

Therefore, approximately 994.8 liters of oxygen will be spent on burning 300 liters of ethane containing 5.8% non-combustible impurities.

The mass (in grams) of C2H6O necessary to produce 12.0 g CO2 is 6.29 g.

Given the following reaction:

C2H6O (l) + 3O2 (g) → 2CO2 (g) + 3H2O (l)

In the given reaction, 2 moles of CO2 is produced per 1 mole of C2H6O consumed. And also, the molar mass of CO2 is 44 g/mol.

So, 2 moles of CO2 has a mass of 2 × 44 = 88 g/mol.

The number of moles of CO2 produced is 12.0 g ÷ 44 g/mol = 0.273 mol of CO2.

Since the mole ratio of CO2 to C2H6O is 2 : 1.

Then the number of moles of C2H6O required to produce 0.273 mol of CO2 will be:

=0.273 mol of CO2 × 1 mol of C2H6O ÷ 2 mol of CO2

= 0.1365 mol of C2H6O.

The molar mass of C2H6O = 2(12.01 g/mol) + 6(1.01 g/mol) + 1(16.00 g/mol)

                                             = 46.08 g/mol

The mass of C2H6O required is:

0.1365 mol of C2H6O × 46.08 g/mol = 6.29 g of C2H6O is necessary to produce 12.0 g CO2.

Therefore, the mass (in grams) of C2H6O necessary to produce 12.0 g CO2 is 6.29 g.

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Answer: chlorofluorocarbon

Explanation:

chlorofluorocarbon

Answer:

Carbon dioxide (CO2), methane (CH4), and nitrous oxide (N2O) are greenhouse gases. Chlorofluorocarbons (CFCs) are also considered greenhouse gases, but they are now largely banned due to their damaging effects on the ozone layer.

Explanation:

The steady-state temperatures and conversions, we need to solve the energy and material balance equations for the adiabatic CSTR. To determine stability, we can analyze the eigenvalues of the linearized system.

There may be multiple steady states depending on the reaction rate constant and operating conditions.

To find the steady-state temperatures and conversions in the adiabatic CSTR, we need to solve the energy and material balance equations. The energy balance equation for an adiabatic CSTR is given by:

Q - ΔHr*V = 0,

where Q is the heat transfer rate, ΔHr is the enthalpy change of the reaction, and V is the volume of the reactor. Since the reactor is adiabatic (no heat transfer), the equation simplifies to:

ΔHr*V = 0.

The material balance equation for a liquid phase reaction is given by:

v*(CAO - CA) = -r*V,

where v is the volumetric flow rate, CAO is the initial concentration of A, CA is the concentration of A at steady state, and r is the reaction rate.

Using the first-order reaction rate equation, r = k*CA, where k is the rate constant, we can rewrite the material balance equation as:

v*(CAO - CA) = -k*CA*V.

Simplifying the equation, we get:

v*CA + k*V*CA = v*CAO.

Rearranging the equation and substituting the given values, we can solve for CA, which represents the concentration of A at a steady state. With the known concentration of A, we can calculate the conversion, X, using the formula:

X = (CAO - CA)/CAO.

By solving the material balance equation and calculating the conversion, we can find the steady-state temperatures and conversions.

In terms of the number of steady states, there may be multiple solutions depending on the reaction rate constant, k, and the operating conditions. The system can exhibit multiple steady states if there are multiple roots to the material balance equation.

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To calculate Susie's required speed to make it to class on time, we need to determine the total time it takes her to traverse the three hallways.

Given:

First hallway distance = 35.0 m

Second hallway distance = 48.0 m

Third hallway distance = 60.0 m

We can calculate the total time as the sum of the time taken for each hallway:

Time is taken for the first hallway = Distance / Speed

Time is taken for the second hallway = Distance / Speed

Time is taken for the third hallway = Distance / Speed

The total time is then:

Total time = Time for first hallway + Time for second hallway + Time for third hallway

Since we know that Susie has 2 minutes (120 seconds) from the current time until the bell rings at 9:13 a.m., we can set up the equation:

Total time = 120 seconds

Now let's substitute the given distances into the time equations:

35.0 m / Speed + 48.0 m / Speed + 60.0 m / Speed = 120 s

Combining the terms:

143.0 m / Speed = 120 s

Solving for the speed (Speed = Distance / Time):

Speed = 143.0 m / 120 s

Speed ≈ 1.192 m/s

Therefore, Susie needs to run at approximately 1.192 meters per second to make it to class on time.

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Answer:

The electronegativity from order of least to highest is:

Ne, Ca, Fe, F

Explanation:

Elements in the periodic table have been arranged based on their level of electronegativity (which is the ability of an atom to attract electrons).

According to Paulings scale of rating elements based on their electronegativity, the electronegativity value of Fe, Ca, Ne, and F are 1.83, 1, 0 and 3.98 respectively.

Hence, based on Pauling scale, the order of electronegativity from least to highest is:

Ne > Ca > Fe > F

Answer:Since all ionic compounds are neutral, total positive charges and total negative charges have to equal. So combination ratio between ions depends on the charges of the two ions combine.

Explanation:

Answer:

Both objects are in physical contact with each other

Explanation:

Conduction refers to the flow of heat from one object to another when the both objects are in contact with each other.

Hence, before heat can flow from one object to another, the two objects must be in contact with each other. This is a key requirement before conduction can take place.

The presence of an alcohol group (-OH) in a molecule, compared to the presence of a methyl group (-CH3), increases the ΔT value of a molecule.

The presence of an alcohol group (-OH) leads to the formation of hydrogen bonds, which are stronger than the van der Waals forces present in molecules with a methyl group (-CH3). As a result, more energy is required to break these hydrogen bonds, leading to a higher ΔT value (a greater change in temperature during phase transitions).

Therefore the correct answer is A. increases.

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Answer:

If you were speaking of the term mole as a skin condition then a teacher might compare it to a beauty spot. In the position your were speaking of it as an animal they might compare it to mouse a rat or a hamster. In the case you were speaking of a mole as a secret agent then a teacher might compare them to a double agent.

In the box on a periodic table  we can find its atomic number, symbol, average atomic mass, and (sometimes) name of the element.

By the 20th century, it was clear that atomic numbers, not atomic masses, were involved in the periodic relationship. The periodic law, a more recent formulation of this relationship, states that an element's properties are a periodic function of its atomic number.

The elements are arranged in a modern periodic table in increasing order of their atomic numbers, and atoms with comparable properties are grouped in the same vertical column (Figure below). With its atomic number, symbol, average atomic mass, and (sometimes) name, each box represents an element. The elements are grouped in 18 vertical columns called groups and seven horizontal rows known as periods or series.

Each column's header lists the names of its groups. Roman numerals and capital letters have traditionally been used on labels in the United States. The IUPAC advises using the digits 1 through 18, and these labels are more widely used. Parts of two of the rows, totaling 14 columns, are typically written below the table's main body in order for it to fit on a single page.

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The correct depiction of the particles A and B as shown in the table is; particle A is present in 3d orbitals, and Particle B is packed in the nucleus.

The term subatomic particle refers to a particle that is found inside the atoms recall that the Dalton theory initially opined that the atom is indivisible. This was however overturned by the discovery of the existence of the subatomic particles.

Now we know that there are three fundamental subatomic particles and these are;

The electron is negative and it can be found in the shells and is arranged in orbitals in the nucleus. The proton and the neutron are both found in the nucleus.

The orbital refers to the region in space where there is a high probability of finding the electron. Now we know that the electrons are arranged in the orbitals of the atom in order of increasing energy.

It the follows that, the correct depiction of the particles A and B as shown in the table is; particle A is present in 3d orbitals, and Particle B is packed in the nucleus.

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Answer:

A. Florine has a stronger pull than Magnesium

Explanation:

Electronegativity refers to the tendency in which an tom would attract electrons to itself.

Below each element in the periodic table is their electronegativity value. Florine has the highest electronegativity value of 4.0.

Going through options;

A. Florine has a stronger pull than Magnesium

Florine = 4.0

Magnesium = 1.2

This correct

B. Hydrogen has a stronger pull than Phosphorus

Hydrogen = 2.1

Phosphorus = 2.1

This is wrong

C. Potassium has a stronger pull than Sodium

Potassium = 0.8

Sodium = 0.9

This is wrong

D. Iron has a stronger pull than Bromine

Iron = 1.8

Bromine = 2.8

This is wrong

Oxygen and calcium react to generate calcium oxide. The chemical made of calcium and oxygen has the formula CaO. This reaction's chemical formula is 2Ca + O2 2CaO.

the eight types of chemical reactions that are most frequently encountered are: decomposition reaction, combination reaction, combustion reaction, single displacement reaction, double displacement reaction, precipitation reaction, and redox reaction.

The evolution of a gas, precipitate formation, color change, temperature change, and state change are significant aspects.

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Counting electrons

When drawing molecules, an important first step is to first count the total valence electrons (electrons in the outer shell) in the molecule. Sulfur has 6 valence electrons, each oxygen has 6 valence electrons, and the 2- charge indicates there are 2 additional electrons. This comes out to be a total of 32 electrons.

Drawing the molecule

The next step is to draw the general shape of the molecule. In this case, sulfur is the central atom and 4 oxygens surround it, so draw a sulfur atom labelled as S with 4 oxygens equally spaced around it.

Next, you want to fill in the bonds between each oxygen to the sulfur atom. This will be a total of 4 bonds.

Now, count the number of electrons used. 4 bonds consisting of 2 shared electrons each is 8 electrons. We have 24 electrons left.

Add these remaining 24 electrons to the surrounding oxygens in pairs of 2, making sure that no atom has more than 8 electrons around it (1 bond and 3 pairs).

This is one possible structure of SO4 2-, but it is not the most common one.

Formal charge of each atom in a molecule is calculated by taking the normal amount of valence electrons, in sulfur for example, 6, and subtracting it by the total amount of non-bonding electrons and the amount of bonds. In this case in the structure we just drew above, the formal charge is 6-4=2, where 4 is the amount of bonds to sulfur.

FC=V−N−B/2

this is the equation for formal charge. V is the valence electrons of the atom in its ground state, or when it is not bonded to anything else. N is the number of non-bonding, or loose, electrons around the atom in the molecule. B is the number of electrons that are in bonds.

All atoms in a molecule want to have a formal charge as close to zero as possible, and this is a rare case where sulfur can be an exception to the octet rule and have more than 8 valence electron in order to satisfy this need.

Therefore, in this case, 2 of the single bonds around sulfur can be replaced by double bonds, so that the formal charge is 6-6=0. So, for two of the oxygens, remove one pair of electrons and turn them into bonds with sulfur.

There are several different places you can add these double bonds, which lead to structures called resonant structures. Resonant structures have the same number of non bonding electrons and bonds, but the single and double bonds are in different places.

The attached image is just one resonant structure, but keep in mind there are other possible very similar structures-- for example, the double bonds could be opposite of each other.

These structures are more common as they have the lowest formal charge on the central atom, sulfur.

The substance in the image above would be classified as a mixture of elements (option E).

A compound is a substance formed by chemical bonding of two or more elements in definite proportions by weight.

On the other hand, a mixture is made when two or more substances are combined, but they are not combined chemically.

According to this question, an image is shown with two different substances or elements as distinguished by coloration (white and purple). These elements are combined but not chemically bonded, hence, is a mixture.

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Answer:

Which problem ??

Explanation:

Can you write your problem ??