lewis structures cannot

Answer:

It should be -2; like hydrogen sulfide H2S

Explanation:

1) Aufbau principle is a scheme used to reproduce the electron configurations  of the ground states of atoms by successively filling subshells with electrons in a specific  order, filling subshells in the following order: 1s, 2s,  2p, 3s, 3p, 4s, 3d, 4p, 5s, 4d, 5p, 6s, 4f, 5d, 6p, 7s, 5f.

First exceptions to the Aufbau principle is for example chromium atom (Cr).

Chromium has atomic number 24, it means it has 24 protons and 24 electrons.

The Aufbau principle predicts the configuration  [Ar] 3d⁴ 4s².

But the correct electron configuration of chromim atom is:

₂₄Cr 1s² 2s² 2p⁶ 3s² 3p⁶ 3d⁵ 4s¹ or   [Ar] 3d⁵ 4s¹.

In chromium, half full d-sub level (3d) is more stable than a partially filled d sub-level (3d⁴), that is why an electron from the 4s orbital goes to a 3d orbital.

2) Second example is gallium atom (Ga).

Gallium has atomic number 31, it has 31 protons and 31 electrons.

The Aufbau principle predicts the configuration:

₃₁Ga 1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p¹.

The correct electron configuration for gallium atom is:

₃₁Ga 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p¹.

That is because 3d subshell has lower energy, when is filled with electrons, than 4s subshell.

Valence electrons are in 4s and 4p orbitals, because when gallium loses three electrons, it has electron configuration:

₃₁Ga³⁺ 1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰.

The nuclear charge of lithium-6 and lithium-7 is +3 for both isotopes. This is because both isotopes have 3 protons. The difference in isotopes lies only in the number of neutrons.

To understand the nuclear charge of lithium isotopes, it is essential to know that the nuclear charge (Z) is determined by the number of protons in an atom. Lithium, regardless of its isotope, always has 3 protons. Therefore, the nuclear charge of lithium-6 is +3 and the nuclear charge of lithium-7 is also +3.

Here's a brief description of both isotopes:

Regardless of the difference in their neutrons, the nuclear charge remains the same for both isotopes because the nuclear charge depends solely on the number of protons present.

This is im 90% sure false because if an object is bigger it doesnt mean that its temperature is higher :)

3+

So, compounds of boron contain boron in a positive oxidation state, generally +3. The sum of oxidation numbers of all constituent atoms of a given molecule or ion is equal to zero or the charge of the ion, respectively. ... In most of the stable compounds of boron, its oxidation number is +3

"The charge oxidation state for boron in its compounds is typically +3.

To understand why boron typically has an oxidation state of +3, one must consider the electron configuration of boron and its position in the periodic table. Boron is the first element in group 13 (IIIa) and has an electron configuration of [tex]1s^2 2s^2 2p^1[/tex]. This means it has three electrons in its outermost shell.

In chemical compounds, boron tends to form three covalent bonds with other atoms to fill its outer shell, achieving an octet configuration similar to that of noble gases. By sharing its three valence electrons with other atoms, boron effectively loses three electrons, which corresponds to an oxidation state of +3.

For example, in the compound boron trifluoride (BF3), boron forms three covalent bonds with fluorine atoms. Each fluorine atom has seven electrons in its outer shell and needs one more electron to complete its octet. By sharing one electron with boron, each fluorine atom completes its octet, and boron, by sharing three electrons, also achieves a stable configuration. In this compound, boron has an oxidation state of +3 because it has effectively lost three electrons to the more electronegative fluorine atoms.

Similarly, in other boron compounds like boron trioxide[tex](B_2O_3)[/tex]or boron nitride (BN), boron also exhibits an oxidation state of +3. This is a characteristic feature of boron's chemical behavior and is a direct consequence of its electron configuration and its position in the periodic table.

Answer: Option (A) is the correct answer.

Explanation:

Physical change is defined as a change that does not bring any changes in the chemical properties of a substance.

For example, solubility, density, volume etc are all physical changes.

When sugar dissolves in water then it is a physical change.

Whereas color change may not necessarily shows a physical change because a chemical change can also lead to color change of a solution or substance.

For example, rusting of iron is a chemical reaction in which color change also occurs.

Hence, we can conclude that a solid dissolves when added to a liquid is most clearly an example of a physical change.

The uranium within these items is radioactive and should be treated with care. Uranium's most stable isotope, uranium-238, has a half-life of about 4,468,000,000 years. It decays into thorium-234 through alpha decay or decays through spontaneous fission.

None Of the Above

Is the answer

Hope this helped plz mark

Hi There!

Question - What is a stationary front?

Answer - None of the above.

Why - The reason I say this because in a stationary front its made of low pressure systems so its not A or B. The wind blows the low pressure system which cause precipitation. If its not D then is C.

Hope This Helps :)

Answer: 18.42 grams of lead (II) sulfide will be produced in the given reaction:

Explanation: The reaction of lead (II) acetate and hydrogen sulfide follows:

[tex](CH_3COO)_2Pb+H_2S\rightarrow PbS+2CH_3COOH[/tex]

To calculate the moles, we use the formula:

[tex]Moles=\frac{\text{Given mass}}{\text{Molar mass}}[/tex]    ....(1)

Molar mass of lead (II) acetate = 325.29 g/mol

Given mass of lead (II) acetate = 25 g

Putting values in above equation, we get:

[tex]Moles=\frac{25g}{325.29g/mol}=0.0768moles[/tex]

We are given that hydrogen sulfide is present in excess, so limiting reagent is lead (II) acetate because it limits the formation of product.

By stoichiometry of the reaction,

1 moles of lead (II) acetate produces 1 mole of lead (II) sulfide

So, 0.0768 moles of lead (II) acetate will produce = [tex]\frac{1}{1}\times 0.0768[/tex] = 0.0768 moles of lead (II) sulfide.

Now, to calculate the mass of lead (II) sulfide, we use equation 1, we get:

Molar mass of lead (II) sulfide = 239.3 g/mol

[tex]0.0768mol=\frac{\text{Given mass}}{239.3g/mol}[/tex]

[tex]\text{Mass of lead (II) sulfide}=18.42g[/tex]

When 25.0 g of lead (II) acetate reacts with excess hydrogen sulfide, 18.37 grams of lead (II) sulfide are produced, based on stoichiometry and molar mass calculations.

To calculate the number of grams of lead (II) sulfide produced when 25.0 g of lead (II) acetate reacts with excess hydrogen sulfide, first, you need to write the balanced chemical equation for the reaction:

Pb(C₂H₃O₂)₂+ H2S ightarrow PbS + 2C₂H₄O₂

This indicates that one mole of lead (II) acetate produces one mole of lead (II) sulfide. Next, find the molar mass of lead (II) acetate and lead (II) sulfide:

Molar mass of Pb(C₂H₃O₂)₂ = 325.29 g/mol

Molar mass of PbS = 239.26 g/mol

Then, calculate the number of moles of lead (II) acetate:

25.0 g Pb(C₂H₃O₂)₂ times (1 mol / 325.29 g) = 0.0768 mol

Assuming complete reaction and that lead (II) acetate is the limiting reagent, the same number of moles of PbS will be formed. Finally, calculate the mass of PbS:

0.0768 mol PbS times (239.26 g/mol) = 18.37 g of PbS

Therefore, 18.37 grams of lead (II) sulfide are produced.

Correct answer is: A

Answer: The correct answer is Option A.

Explanation:

We are given some ions, which are:  [tex]Na^+,PO_4^{3-},V^{3+}\text{ and }Cl^-[/tex]

The compounds which may be formed from these ions will be [tex]Na_3PO_4,NaCl,VPO_4\text{ and }VCl_3[/tex]

Precipitates are defined as the substances which are not soluble in water at any temperatures. They remain undissolved in water.

Out of the formed salts, the soluble ones are [tex]Na_3PO_4,NaCl\text{ and }VCl_3[/tex]

[tex]VPO_4[/tex] remains insoluble in water and thus, the correct answer is Option A.

assume you have 1 mole (or any other number, it doesn't matter). Mass = 206.98 g/mole. This is straight from the molar mass so that's why I like to use 1 mole  

From the chemical formula, 1 mole of Ca(ClO3)2 contains 6 moles of oxygen atoms.  

Mass of 6 moles of O atoms = 6 moles * 16 g/mole = 96 g  

mass % oxygen = 96 g / 206.98 g * 100 = 46.4%.  

You could also do it on a mole percent. 1 mole of Ca(ClO3)2 contains 9 moles of atoms.  

6 moles of these are oxygen atoms so the mole % = 6 moles / 9 moles * 100 = 66.7 mole %

If you mean percent by weight or percent by composition? Ca(ClO3)2 is 67% O by composition (number of atoms) and, as calculated by Ricki, 46% by weight.

The percentage composition of oxygen in the compound Ca(ClO₃)₂is approximately is 46.38%.

Percent composition is defined as a convenient way to record concentration of solution.It is a expression which relates one element to compound as,mass of element/mass of compound ×100.Percent compositions helps in determination of amount of an element which is present in the compound.

Percent composition of a compound or an element is usually in terms of grams of an element or a compound.

In the given example, molar mass of calcium chlorate is 206.98 g/mole and that oxygen present in it is 96 g/mol,substituting these values in above formula we have, 206.98/96×100=46.38 %

Thus, the percentage composition of oxygen in the compound Ca(ClO₃)₂is approximately is 46.38%.

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Polar Covalent is the name used to describe bonds that have both ionic and covalent character because the electrons are shared unequally. The Pauling Scale is used to assign electronegativity to atoms. It ranges from to 4.00 (fluorine).

Final answer:

The electronegativity difference between two atoms in a bond determines the ionic or covalent character of the bond. A greater difference in electronegativity indicates a more polarized electron distribution and larger partial charges of the atoms. Small or zero electronegativity differences indicate nonpolar covalent bonds.

Explanation:

The electronegativity in the determination of the ionic or covalent character of a bond is calculated by finding the difference in electronegativity between the two atoms in the bond. Electronegativity is a measure of the tendency of an atom to attract electrons towards itself in a chemical bond. The greater the difference in electronegativity, the more polarized the electron distribution and the larger the partial charges of the atoms. If the electronegativity difference is very small or zero, the bond is covalent and nonpolar. When the difference is large, the bond is polar covalent or ionic.

[tex]W_{I}= F_{I}[/tex]×[tex]D_{I}[/tex]

where [tex]W_{I}[/tex] is the work input

[tex]F_{I}[/tex] is effort force or force input

[tex]D_{I}[/tex] is the input distance

C. Rapping, is your answer.

Answer:

D

Explanation:

electromagnet STUDY ISLAND :)

Electromagnetic waves best describes the signals sent and received by satellites. Therefore, the correct option is option D.

In classical physics, electromagnetic radiation refers to the movement of energy through a material medium or across empty space at the speed of light in the form of the magnetic and electrical fields that comprise up electromagnetic waves like electromagnetic radiation, visible light, including gamma rays.

Time-varying magnetic and electric fields are linked to one another at right angles or perpendicular towards the direction that of motion in such a wave. The strength and wavelength v of the time fluctuation of the magnetic and electricity fields define an electromagnetic wave. Electromagnetic waves best describes the signals sent and received by satellites.

Therefore, the correct option is option D.

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It's internal energy or heat energy.

An atom's atomic number equals the number of protons and in a neutral atom, also, the number of electrons. The mass number equals the total number of protons and neutrons. Subtracting the atomic number from the mass number gives the number of neutrons.

In order to determine the number of protons, neutrons, and electrons an atom has, you need to understand the key terms: atomic number and mass number. The atomic number of an element represents the number of protons in an atom and, in a neutral atom, this also equals the number of electrons. The mass number (or atomic mass) is the total amount of protons and neutrons in an atom. To find out the number of neutrons in an atom, you subtract the atomic number from the mass number. Hence, if the atomic number (Z) represents the number of protons and the mass number (A) represents the number of protons plus neutrons, the formula A - Z = number of neutrons can be used to find the number of neutrons in an atom.

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1 and 2 are a metal - nonmetal pair - that kinda means ionic bond. Na and F are going to lose electrons.

3 [Nonmetals bond to each other covalently! Ne and O are nonmetals. O would need 2e to become stable. Either getting 2e (ionic bond) or sharing 2e (with H, for example). However, Ne is a noble gas, which means it is already doing fine with its 8e on its valence shell and isn't gonna share 2e of its electrons with O. So, despite the fact that they are both nonmetals, they won't form a covalent bond.

Sum up: they are 2 gases haha, and one of them is a noble one. They will never bond to each other covalently

4 - C and S - right answer

As they are both nonmetals (nonmetals bond to each other covalently, none of them is a noble gas, and so on)

D. circuit breaker

Hope This Helped

The answer is "opposite charges."

When clothes are removed from the dryer and cling together, it is because static electricity is created from the clothes rubbing together in the dryer. This results in an imbalance of electrical charge on the clothes, with some having a net positive charge and others a net negative charge, which makes them attract and stick to each other.

When clothes are removed from the dryer and they cling together, this is due to the presence of static electricity. Static electricity occurs when materials are rubbed together, causing an exchange of electrons. This exchange results in the materials being electrically charged. In the case of your dryer, the process of tumbling and rubbing the clothes together can strip electrons from the clothes and deposit them on other pieces.

This creates an imbalance in charge, leading to some clothes having a net positive charge and others with a net negative charge. The positively charged clothes are attracted to the negatively charged ones, and this attraction causes the clothes to stick together. The force that brings these different charged clothes together is called electrostatic force. If the clothes are damp, the presence of water molecules can suppress the charge, reducing the static cling.

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S+O2 =SO2 SULFUR DENOTE S  

TWO ATOM OF OXYGEN DENOTE O2

Answer is: qcalorimeter is 8635.9273 J.

ΔT= 22.35°C - 18.94°C.

ΔT = 3.41°C = 3.41 K; temperature change.  

m(H₂O) = 600.0 g; mass of water.  

mr = 605.0; mass of solution.

cp= 4.186 J/g·K, specific heat capacity of the solution.  

qcal = mr · ΔT· cp.  

qcal = 605 g · 3.41 K · 4.186 J/g·K.  

qcal = 8635.9273 J; amount of heat absorbed.

Amount of heat absorbed of calorimeter when 5g of NaHCO₃ is added to 600g of water in a ‘coffee cup calorimeter' is 700,396.4968 J.

Amount of absorbed heat will be calculated as:
Q = mcΔT, where

ΔT = change in temperature = 22.35°C - 18.94°C = 3.41°C = 276.56 K

m = mass of solution = (5g + 600g) = 605g

c = specific heat of calorimeter = 4.186 J/g.K

On putting these values on the above equation, we get

Q = (605)(4.186)(276.56)

Q = 700,396.4968 J

Hence heat of calorimeter is 700,396.4968 J.

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B. Physical weathering will cause the ice to crack the rock.

Answer:

The correct answer is B.

Explanation:

The Earth's surface as water freezes and expands on a mountain slope will cause ice to break the rock. This occurs because the ice occupies a larger volume than the liquid, so it displaces the rock and causes it to break. When the water that accumulates in the rocks freezes, its volume increases in solid-state and exerts a greater pressure, enough to break the rock.

Have a nice day!

Mass is calculated by using an objects inertia. Since inertia is a quality of matter that resists motion, we can apply an increasing force to an object until it accelerates.

Then, by measuring its acceleration we can now determine its mass using the simple equation F=m×a, except rewritten as m=Fa.

So we divide the force that we applied by the acceleration rate and we get the objects mass.

Without inertia this cannot be done.

∴ Answer is C

The true statement among the options is C, stating that the mass of an object can be measured by its inertia. This highlights the direct relationship between an object's mass and its inertia, distinguishing mass from weight, which is gravity-dependent.

The question asks to choose the TRUE statement from the given options regarding mass, weight, and inertia. The correct answer is C. The mass of an object can be measured by its inertia. This statement is true because mass is a measure of the amount of matter in an object and determines its inertia - i.e., its resistance to changes in motion. Newton's first law, often called the law of inertia, illustrates that objects with more mass (more "stuff") have more inertia. Hence, an object's mass, an intrinsic property that does not change with location, can indeed be measured by its inertia. Weight, however, is the force of gravity acting on an object and can vary based on the object's location in a gravitational field.

Gamma Decay in the nucleus is similar to Photon Decay in atoms. When a electron charges energy levels in the atoms, it  desposes of photon (with energy of order electron volts).

The isotope is phosphorus-32.  

It possesses 15 protons that make it phosphorus, 15 electrons, thus, the charges get balanced, and it is electrically neutral. It has 17 neutrons, so in combination, it has 32 protons/neutrons in the nucleus. Therefore, the name is phosphorus-32.  

The phosphorus-32 is a beta-emitter with a half-life of 14.3 days that is, used regularly in life-science projects, mainly to generate radiolabeled RNA and DNA probes, like for application in Southern Blots and Northern Blots.  

Answer:

32P

Explanation:

We should definitely seek shade to sun exposure between 10 A.M. and 4 P.M.

Hope this helped!

Long, the ocean tides we experience on earth are caused by the sum of the moon's gravitational gradient and the sun's gravitational gradient. When the sun and the moon are aligned, or nearly aligned, their gravitational gradient fields add together constructively, leading to extra strong tides (high tide is extra high and low tide is extra low). This alignment happens when the moon is a new moon or a full moon, which occurs about every two weeks. The moon takes about a month to orbit the earth, hence strong tides occur about twice a month. In contrast, when the sun and the moon are unaligned, their gravitational gradients tend to cancel out, leading to weak tides (high tide is not very high and low tide is not very low). But even when the sun and moon are perfectly unaligned (they form a 90 degree angle relative to the earth), there are still tides because the moon's gravitational gradient is stronger than the sun's. The sun's gravitational gradient never completely cancels out the moon's. The biweekly strong tides are called "spring tides" even though they occur all year long. The name does not refer to the season "Spring", but to the verb "spring" which means to leap forth, because the strong high tides leap higher up the shore. The biweekly weak tides are called "neap tides".

The Sun and Moon's gravity causes Earth's tides, with the Moon having a greater effect due to its proximity. Spring tides happen when the Earth, Moon, and Sun are aligned, and neap tides occur when the Sun and Moon are at a 90° angle.

The gravity of the Sun and the Moon significantly affects the Earth's tides through a phenomenon known as the tidal effect. Although the gravitational pull of the Sun is nearly 200 times that of the Moon, the tidal effect of the Moon is stronger because of its closer proximity to Earth. The gravitational forces of these celestial bodies cause bulges in Earth's oceans, creating high tides on the sides of Earth closest and farthest from the Moon, and to a lesser extent, from the Sun. This variability in high tides is due to the different positions of the Sun and Moon relative to Earth. The largest tides, known as spring tides, occur when the Earth, Moon, and Sun are aligned, while the smallest tides, neap tides, happen when the Sun and Moon are at 90° angles relative to Earth.

When light with a continuous spectrum (emitted by a black body) passes through a cool transparent gas, dark lines are observed in the continuous spectrum.

Answer is dark lines

When light from a black body having a continuous spectrum passes through a cool transparent gas, observed in the continuous spectrum are absorption and emission.

The black body is an object or material of black color which absorbs the lights of every type of wavelength either it is blue of the lowest wavelength or red of the highest wavelength.

The radiation emitted by a black body is called the radiation of a black body. The stars almost act like a black body. The amount of radiation emitted by the length of each wavelength depends only on the temperature of the object.

Therefore, light from a blackbody having a continuous spectrum passes through a cool transparent gas, observed in the continuous spectrum are absorption and emission.

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