4. In the space below, write the electron configurations of the following elements: using main shell, Subshell and Noble gas a) oxygen b) sodium c) Chlorine d) Nitrogen​

In this compound, there would be five proton NMR signals,

We know that the acronym NMR means nuclear magnetic resonance. It has to do with the kind of spectrum in which the kind of chemical environment where the proton is found would impact the spectrum that is observed in the compound.

The first thing that we need to look at and find out in the image is to be able to find out the number of chemical environments that we have in the compound as we can see it in the image.

By studying the compound closely, we can see that there are four different proton chemical environments that we can be able to see and map out from the compound and it is these chemical environments that tell us the number of signals to expect.

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Answer:

0.3269

Explanation:

You would use the ideal gas law along with the equation Pv=nrt when P is pressure, v is volume, n is the moles of gas you are solving for, r is a constant that is , and t is temperature,

So you are given pressure, volume, and temperature, so you would begin by plugging in your known values:

P = 1atm

V = 8.00 L

T = 298 K ( but you usually want to use Kelvin so you would add 273.15; this is because 0 C is 273.15 K and 25+273=298)

(1)(8)=n(0.0821)(298)

then

8=n(24.4658)

next isolate n by dividing 24.4658 on each side

8/24.4658 = n (24.4658/24.4658)

0.3269=n(1) or n

12500 joule heat is released when an acetylene (C2H2) torch burns 250 grams of fuel

q=ΔnH

H  acetylene = -1300 kJ/mo

n=given mass/molar mass

given mass= 250 g

molar mass=26

n= 250/26

n=9.61

q=ΔnH

q=9.61× -1300 kJ/mo

q=-12500 joule

In thermodynamics, heat has a very specific definition that is different from how we generally use the word. When two systems with various surface temperatures come into touch with one another, heat is the thermal energy that is transferred. The letters q or Q stand for heat, which is measured in joules.

Heat is sometimes referred to as a process quantity since it is defined in the context of a process through which energy can be conveyed. We may talk about the heat that a hot cup of coffee imparts to your hand, but we don't talk about the heat that a cup of coffee itself holds. Heat is yet another noteworthy quality.

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87420 g  CO and 12580 g H2 mass would be needed to produce 100.0 kg of methanol in CO + H2 = CH3OH.

The atomic mass of an element refers to the mass of the constituents that make up its atom. A multiple of 1.992646547 1023 gram, or more specifically, 1.992646547 gram, is used to denote one-twelfth of the mass of the carbon-12 atom, which has an ascribed atomic mass of 12 units. On this scale, one atomic mass unit is equal to 1.660539040 1024 grammes (amu). In honour of English physicist John Dalton, the atomic mass unit is occasionally called the dalton (Da).

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Answer:

Heterotrophs

Explanation:

Heterotrophs are known as consumers because they consume producers or other consumers. Dogs, birds, fish, and humans are examples of heterotrophs. Heterotrophs occupy the second and third levels of the food chain, the chains of organisms that provide energy and nutrients to other organisms.

The concentration terms are molality, normality and mole fraction. Molarity can be used to find out the ionic strength of any solution. Therefore, the mass of CH[tex]_2[/tex]O is 4.80g.

Molarity can be calculated by dividing number of moles of solute by volume of solution in liter. Molarity is affected by temperature. Its unit is mole/liter. It measure the concentration of any solute in a solution.

Mathematically,

Molarity= number of moles of solute÷ Volume of solution in liter

number of moles of solute =given mass÷ Molar mass of solute

number of moles of solute =mass÷30.03 g/mol

Molarity=0.314 M

Volume of solution=0.505 liters

Substituting all the given values, we get

0.314 M= {mass÷30.03 g/mol}÷ 0.505 liters

mass÷30.03 g/mol=0.15

mass =4.80g

Therefore, the mass of CH[tex]_2[/tex]O is 4.80g.

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The compound with the chemical formula PbBr₄ is called lead(IV) bromide.

Lead(IV) bromide is an inorganic compound composed of the elements lead (Pb) and bromine (Br). The compound is named based on the oxidation state of lead, which is +4 in this case.

In naming compounds, the Roman numeral in parentheses after the element name indicates the oxidation state of the metal. In the case of lead(IV) bromide, the Roman numeral IV indicates that lead is in the +4 oxidation state. This means that lead has lost four electrons to achieve a stable configuration.

The name "lead(IV) bromide" accurately represents the composition and oxidation state of the compound. It is worth noting that lead(IV) bromide is a relatively unstable compound and is not commonly encountered in practical applications.

Hence, the name of the compound is lead(IV) bromide.

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Since energy can neither be created nor destroyed, it follows that the wavelength that was absorbed by the electron is also emitted.

We know that the Bohr model posses the idea that an electron could move from a lower to higher energy level by the absorption of a photon of light. Thus we know that, when we supply energy to the electron, it is that energy that leads to the electronic transition.

It is clear that the energy that the electron has taken in when it moves up is the same as the energy that it would give out when it comes down in accordance with the law of conservation of energy.

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The unique property of the orbitals around the nucleus of an atom is that each orbital has electrons of a specific energy level; option B.

Orbitals in an atom are regions of space around which electrons are found in an atom.

The orbitals in an atom are also described as energy levels.

Electrons are arranged in atomic orbitals from orbitals having the lowest energy to orbitals having the greatest energy.

The outermost orbital of an atom is known as the valence orbital and electrons found there are known as valence electrons.

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The balanced chemical equation is [tex]\rm 2SO_2 + O_2 \rightarrow 2SO_3[/tex].

Balanced chemical equation is defined as a formula where both the reactants and the products have the same amount of atoms of each kind. The law of conservation of mass stipulates that mass cannot be generated or destroyed, hence a chemical equation must always be in balance.

The balanced chemical equation are

[tex]\rm 4NH_3 + 3O_2 \rightarrow 2N_2 + 6H_2O[/tex]

[tex]\rm C_4H_1_0+ 5O_2 \rightarrow 4CO_2 + 5H_2O[/tex]

[tex]\rm 2Pb(NO_3)_2 \rightarrow 2PbO + 4NO_2 + O_2[/tex]

[tex]\rm 8Al + 3Fe_3O_4 \rightarrow 4Al_2O_3 + 9Fe[/tex]

[tex]\rm Sr + 2H_2O \rightarrow Sr(OH)_2 + H_2[/tex]

Thus,  balancing the chemical equation is very important as per the law.

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The way that scientists predict how much of a product can be formed is through the use of Stoichiometry.

The quantitative examination of the constituents of a chemical process is known as chemical stoichiometry. The Greek words "stoikhein" (which means element) and "metron" (which means measure) are the roots of the English word "stoichiometry."

Stoichiometry describes the correlation between the amounts of reactants and products before to, during, and after chemical processes.

Therefore, the quantity of the generated good is predicted by stoichiometry. To calculate how many S'more "reactants," for instance, we employed stoichiometry.

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Volume the fluorine gas occupies = 0.73L

What is volume of a gas ?

The gas's volume:

The area occupied by gaseous particles under normal temperature and pressure circumstances is referred to as the volume of gas.

It is identified as a "V."

The letter "L" stands for "liters," the SI unit of volume.

At normal temperature, a mole of gas has a volume of 24 m3, or 24 000 cm3.

The molar volume of a gas is the name given to this quantity.

The gas equation

PV = n R T

P = pressure = 2.04 atm

T = temperature = 5.20 Celsius = 278.20K

V = volume

n = no of moles = 1.24/19 = 0.065moles

R = gas constant = 0.0821lit atm /K

V = 0.065*0.082*278.20/ 2.04 =  0.73L

Volume the fluorine gas occupies = 0.73L

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Answer:20 mi/s

Explanation:

Answer:

search on YT Khan academy work done by gravity

Explanation:

you will get it for sure with best explanation

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We obtain the mass percent of the element T as 96.5%.

We know that the mass percent actually has to do with the mass of the object that we could have in a compound expressed as a percentage. Note that we are told that most of the new elements that were discovered do exist as oxides this implies that they are binary compounds of the element that is involved and oxygen.

Now we have to look at the section of the table that have been given in the question so as to be able to obtain the the mass percent of the element as we have it. We can see as it has been written in the table that the atomic mass of the element T is found to be 362.31.

We would now have;

Molar mass of the compound = 6(362.31) + 5(16)

= 2173.86 + 80

= 2253.86

Mass percent composition of element T =  6(362.31)/2253.86 * 100/1

= 96.5%

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The volume of the solution is obtained as 414 mL.

Often times, we want to  reduce the concentration of a solution and the way that we can be able to do that is by the process of dilution. When we say dilution what it means is that we are going to increase the volume of the solution.

In this case;

C1 = initial concentration

V1 = initial volume'

C2 = final concentration

V2 = final volume

Then;

C1V1 = C2V2

V1 = C2V2/C1

=  7.77 M * 842 mL/ 15.8 M

= 414 mL

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The mass of the magnesium oxide will produce is equal to 9.32 grams

A limiting reagent can be described as the reactant in the chemical reaction which is consumed first during the completion of a chemical reaction.

The limiting reagent decides the yield of the product when the amount of the reactants is not taken in stoichiometry.

Given, chemical reaction of magnesium and iron oxide is:

[tex]3 Mg + 1 Fe_2O_3 \longrightarrow2 Fe + 3 MgO[/tex]

The mass of the magnesium = 5.6 g

The number of moles of Mg = 5.6/24 = 0.233

The mass of the iron oxide = 10 g

The number of moles of  Mg = 10/103.8 = 0.096

The 3 moles of Mg react with iron oxide = 1

Then 0.233 moles of Mg react with iron oxide = 0.233/3 = 0.077

Therefore magnesium is a limiting reagent.

The 0.233 moles of Mg will produce magnesium oxide 0.233 moles.

The mass of the magnesium oxide = 0.233 × 40 = 9.32 g

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Answer: The answer would be C i think

Explanation:

The metals known as Alkaline Earth metals are Na, Mg, or Ca. They are known as "alkaline" earth metals because when they interact with water, they produce "alkaline" hydroxides solutions.

Any of the six chemical elements that make up Group 2 (II a) of the periodic table is an alkaline-earth metal. Beryllium (Be), magnesium (Mg), calcium (Ca), strontium (Sr), barium (Ba), and radium are the constituent elements (Ra).

The alkaline earth oxides, formerly known as beryllia, magnesia, lime, strontium, and baryta, are what give the alkaline earth metals their name. These oxides turn basic when combined with water (alkaline).

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Answer:

cellular respiration occurs both in plant and animal cells.

Explanation:

Cellular respiration definitely occurs in animals, it is how we break down glucose to get ATP. Plants first use photosynthesis to produce glucose and then need a way to produce ATP, being cellular respiration.

A) The work you do on the pumpkin is 31.36 J as you lift it from the ground.

B) The work is zero as you carry it from the field.

Work can be defined as the energy spent when applying a force to move an object through a certain displacement.

The work by a force to move an object through a displacement (d) can be written as:

W = Fdcosθ

Where θ is angle between force and displacement.

(a) The mass, the displacement of the pumpkin from the ground, and the angle are:

m = 3.2 kg

d = 1.4 m

θ = 0∘

Here, the force exerted during lifting the pumpkin is equal to the weight of the pumpkin:

F = mg = (3.2)(9.8) = 31.36 N

Thus, the work done when lifting the pumpkin is

W = F d cosθ = (31.36 N)(1.4m)cos(0∘) = 44 J

(b) When carrying the pumpkin, the force exerted will be upward while the displacement of the pumpkin will always be directed forward. Therefore, they are perpendicular (i.e. θ = 90∘) to each other which is the reason why the work is zero.

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Decantation is widely used to purify a liquid by separating it from an insoluble particle suspension (e.g. in red wine, where the wine is decanted from the potassium bitartrate crystals to avoid unsavory taste).

Decantation is a process of separating solid-liquid mixtures or two or more immiscible liquids. Allowing the mixture to settle into various layers, the lightest/heaviest liquid layers are drained out.

This approach is used in the following ways:

1. Mud-water mixture separation (solid-liquid mixture)

2. Oil and water separation (immiscible liquid mixture)

3. Kerosene and water separation

Decantation is the process of separating liquid from solid and other immiscible (non-mixing) liquids by eliminating the liquid layer on top from the solid or liquid layer underneath.

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On average, the total mass of ions in 4.75 liters of Mackenzie River water is 0.466 g grams.

The formula mass of an ionic compound is determined in the same manner as the formula mass of a covalent compound is determined: by adding the average atomic masses of all the atoms in the compound's formula.

Hence, the total mass is computed as follows:

(0.820 mM Ca 2⁺) X ( 2.25 L) = 1.845 mmoles at 40.0 g/mol = 73.8 mg

(0.430 mM Mg 2⁺) X ( 2.25 L) = 0.9675 mmoles at 24.3 g/mol = 23.51 mg

(0.300 mM Na⁺) X ( 2.25 L) = 0.675 mmol at 23.0 g/mol = 15.52 mg

(0.0200 mM K⁺) X ( 2.25 L) = 0.045 mmol at 39.1 = 1.75 mg

(0.250 mM Cl-) X ( 2.25 L) = 0.5625 mmol at 35.45 g/mol = 19.94 mg

(0.380 mM SO₄²-) X ( 2.25 L) = 0.855 mmol at 96.06 g/mol = 82.13 mg

(1.82 mM HCO₃ -) X ( 2.25 L) = 4.095 mmol at 61.02 g/mol = 249.87 mg

Thus, total mass = 73.8 + 23.51 + 15.52  + 1.75 + 19.94 + 82.13 + 249.87

= 466.52mg

Converted into grams  we have:
466.52/1000

= 0.46652

Hence, on average, the total mass of these ions 4.75 L [tex]\approx[/tex] 0.47 grams.

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Answer:

Octane can be written as C8H18.

The balanced equation for combustion of octane is:

2C8H18 + 25 O2 ==> 16CO2 + 18H2O

Finding the limiting reactant:

10.g C8H18 x 1 mol C8H18 / 118 g = 0.0847 moles (÷2->0.042)

61.2 g O2 x 1 mol O2 / 32 g = 1.91 moles (÷25->0.077)

C8H18 is the limiting reactant and will dictate the maximum amount of H2O that can form.

Maximum H2O formed:

0.0847 moles C8H18 x 18 moles H2O / 2 moles C8H18 x 18 g H2O/mol = 14 g H2O formed (2 sig.figs.)

Explanation:

hope it can help you !

Answer:

Cu(NO3)2 (aq) + K2CO3 (aq) => CuCO3 (s) + 2KNO3 (aq)

Explanation:

I interpret your question is how to balance the above reaction, right?

Cu(NO3)2 (aq) + K2CO3 (aq) => CuCO3 (s) + 2KNO3 (aq)

Cu: 2

NO3: 2

K: 2

CO3: 2

Methane (CH4) is a hydrocarbon that is mostly found in natural gas and has a molecular weight of 4.051747moles per 65.0 grams.

Methane concentrations above a certain threshold can affect how much oxygen is breathed in. This can include headaches, face flushing, memory loss, vision issues, slurred speech, mood swings, nausea, and vomiting. Serious cases could result in altered breathing and heart rate, balance issues, numbness, and coma.

The gas methane (CH4) is colorless, odorless, and very combustible. Carbon and hydrogen are its main ingredients. According to us Environmental Protection Agency, it is also a powerful greenhouse gas, meaning means it influences climate change by causing more warming.

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The molarity of the stock Mn²⁺ ions is 0.0288 M

Based on the dilution formula;

The molarity of a solution is the number of moles of a solute dissolved in a given volume of solution in liters.

The molarity of the stock solution is:

moles of Mn²⁺ ions = mass / molar mass

molar mass of  Mn²⁺ ions = 55.0 g/mol

moles of Mn²⁺ ions = 1.584 / 55

moles of Mn²⁺ ions = 0.0288 moles

molarity of Mn²⁺ ions = 0.0288 / 1

molarity of Mn²⁺ ions = 0.0288 M

The dilution formula is used to determine the molarities of A, B, and C.

C₁V₁ = C₂V₂

C₂ = C₁V₁ / V₂

Where;

Molarity of A = 50 * 0.0288 / 1000

Molarity of A = 0.00144 M

Molarity of B = 10 * 0.00144 / 250

Molarity of B = 0.0000576 M

Molarity of C = 10 * 0.0000576 / 500

Molarity of C = 0.000001152 M

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Based on the mole ratio of the reaction, the mass of aluminum oxide that is produced from the reaction between 5 g of aluminum and 9g of oxygen is 9.39 g.

The mass of aluminum oxide that can be formed from the reaction between aluminum and oxygen is determined from the limiting reactant and the mole ratio of the reaction.

The mole ratio of the reaction is as given in the equation of the reaction below:

2 Al (s) + 3 O₂ (g) ----> Al₂O₃ (s)

The mole ratio of Al to O = 2 : 3

Moles of Al present = 5/27

Moles of Al present = 0.185 moles

Moles of O present = 9/32

Moles of Al present = 0.281 moles

Al is the limiting reactant

Mole ratio of Al to Al₂O₃ = 2 : 1

Mass of Al₂O₃ produced = 0.185/2 * 101.56

Mass of Al₂O₃ produced = 9.39 g

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