The electronic configuration of oxygen is k =2, L=6 the subshell configuration is 1s², 2s²,2p⁴. Similarly the configuration of sodium is 1s², 2s²,2p⁶,3s¹ and that for chlorine is 1s², 2s²,2p⁶,3s²,3p⁵.
What is electronic configuration?The electronic configuration of an element is the distribution of electrons in different orbitals from the lowest energy level to the highest energy level.
Oxygen is 8th element thus having 8 electrons. The main shell configuration is K= 2, L= 6 and the subshell electronic configuration is 1s², 2s²,2p⁴.
Sodium is 11th element. The main shell electronic configuration is K=2, L=8, M=1. Subshell electronic configuration is 1s², 2s²,2p⁶,3s¹ and the noble gas configuration is [Ne]3s¹. Where Ne have 10 electrons.
Chlorine is 17th element with main shell configuration K =2, L=8, M=7.Subshell configuration 1s², 2s²,2p⁶,3s²,3p⁵ and noble gas configuration is [Ne] 3s² 3p⁵.
Nitrogen is 7th element with K= 2, L=5 and subshells, 1s², 2s²,2p³.
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Liquid octane (CH 3 (CH 2 ) 6 CH 3 ) will react with gaseous oxygen (O2) to produce gaseous carbon dioxide (CO2) and gaseous water (H2O) Suppose 8.0 g of is with 39.5 of oxygenCalculate the minimum mass of octane that could be left over by the chemical reaction. Be sure your answer has the correct number of significant digits
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:
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Which of the following is a true statement about cellular respiration? (4 points) a Cellular respiration occurs only in plant cells. b Cellular respiration occurs only in animal cells. c Cellular respiration occurs in both plant and animal cells. d Cellular respiration occurs in some plant cells and some animal cells.
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.
what is the purpose behind decantation
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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Question: Early one October, you go to a pumpkin patch to select your Halloween pumpkin. You lift the 3.2 kg pumpkin to a height of 1.4 m , then carry it 50.0 m (on level ground) to the check-out stand.
Part A: Calculate the work you do on the pumpkin as you lift it from the ground.
Express your answer using two significant figures. W = ? J
Part B: How much work do you do on the pumpkin as you carry it from the field?
Express your answer using two significant figures. W = ? J
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.
What is work?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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Mn2+
ions is prepared by dissolving 1.584 g of pure manganese metal in nitric acid and diluting to a final volume of 1.000 L. The following solutions are prepared by dilution. For solution A, 50.00 mL of stock solution is diluted to 1000.0 mL. For solution B, 10.00 mL of A is diluted to 250.0 mL. For solution C, 10.00 mL of B is diluted to 500.0 mL. Calculate the molar concentrations of the stock solution and solutions A, B, and C.
The molarity of the stock Mn²⁺ ions is 0.0288 M
Based on the dilution formula;
The molarity of A is 0.00144 MThe molarity of B is 0.0000576 MThe molarity of C is 0.000001152 MWhat is the molarity of a solution?The molarity of a solution is the number of moles of a solute dissolved in a given volume of solution in liters.
Molarity = number of moles/volumeThe 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;
C₁ = initial molarityV₁ = initial volumeC₂ = final molarityV₂ = final volumeMolarity 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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3 Mg + 1 Fe2O3 --> 2 Fe + 3 MgO
How many grams of magnesium oxide are made from 5.6 grams of magnesium and 10.0 grams of iron (III) oxide ?
The mass of the magnesium oxide will produce is equal to 9.32 grams
What is a limiting reagent?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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a sample of an unknown gas has a volume of 8.00L at 1.00 atm and 25.0°C. How many moles of gas are present
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
gravity sample work connection’s academy
PLEASE HELP AS SOON AS POSSIBLE WILL MARK BRAINIEST
Answer:
search on YT Khan academy work done by gravity
Explanation:
you will get it for sure with best explanation
mark me please on brainlest
A student claims that if the downward movement of an electron in a hydrogen atom from n = 6 to n = 2 emits a photon with a wavelength of 410 nm then the electron must absorb a photon with a wavelength of 410 nm to move from n = 2 to n = 6. Is the student correct? Justify your answer.
Since energy can neither be created nor destroyed, it follows that the wavelength that was absorbed by the electron is also emitted.
What is the Bohr model?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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how many signals will be expected in the 1H NMR spectrum of the following compound?
In this compound, there would be five proton NMR signals,
What is the proton NMR spectrum?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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4. A solid is 5 cm tall, 3 cm wide and 2 cm thick. It has a mass of 129 g. What is its density?
The Mackenzie River in northern Canada contains, on average,
0.820 mM Ca2+
0.430 mM Mg2+
0.300 mM Na+
0.0200 mM K+
0.250 mM Cl–
0.380 mM SO42–
and
1.82 mM HCO3–.
What, on average, is the total mass of these ions in 4.75 L of Mackenzie River water?
On average, the total mass of ions in 4.75 liters of Mackenzie River water is 0.466 g grams.
What is the total mass of ions?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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How many atoms are there in 65.0 grams of methane, CH4?
Methane (CH4) is a hydrocarbon that is mostly found in natural gas and has a molecular weight of 4.051747moles per 65.0 grams.
What effects has methane on people?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.
Why is methane bad? What is it?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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What volume of does 1.24grams of flourine gas occupy under conditions of 5.20 celcius and 2.04atm?
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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What organisms consume other living things for food 
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.
What is unique about the orbitals around the nucleus of an atom?
Responses
Each orbital has its own set of neutrons.
Each orbital has its own set of neutrons.
Each orbital has electrons of a specific energy level.
Each orbital has electrons of a specific energy level.
Each orbital contain protons.
Each orbital contain protons.
Each orbital has only one electron.
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.
What are orbitals in an atom?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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PLEASE HELP
Can someone explain this?
Commercial concentrated nitric acid, HOg, is 15.8 M. What volume of concentrated HNO; would be required
to prepare 842 mL of 7.77 M HNO}?
Be sure to enter a unit with your answer.
The volume of the solution is obtained as 414 mL.
What is the required volume?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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You time travel 100 years into the future and learn that several new elements have been discovered, as pictured. These elements are frequently found as oxides, and need to be separated in order to extract the pure element. Before going through this effort, it is useful to know what amount of the element can be extracted. What is the mass percent composition of element T in the compound T6O5?
We obtain the mass percent of the element T as 96.5%.
What is the mass percentage?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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Which substance (Na, Mg, or Ca) do you identify with and why?
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.
How many metals made of alkaline earth exist?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).
What other names do alkaline earth metals go by?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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Can someone explain the step?
Calculate the mass (in grams) needed to prepare 0.505 liters of a 0.314 M CH,;O, solution.
You do not need to enter a unit with your answer.
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.
What is molarity?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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Aqueous copper (II) nitrate, Cu(NO3)2 reacts with aqueous potassium carbonate, K2CO3 forming solid copper (II) carbonate, Cu(CO3).
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
How do scientists predict how much of a product can be formed?
The way that scientists predict how much of a product can be formed is through the use of Stoichiometry.
What is 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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If 5 g of Al (26.98g/mol) reacts with 9 g of O2 (32 g/mol), how many grams of Al2O3 (101.56 g/mol) can be formed/
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.
What mass of aluminum oxide can be formed from the reaction between aluminum and oxygen?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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How much heat is released when an acetylene (C2H2) torch burns 250 grams of fuel? (ΔH of combustion for acetylene = -1300 kJ/mol)
Select one:
135 kJ
32500 kJ
12500kJ
5.2 kJ
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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What is the name of the compound with the chemical formula PbBr4
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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1. The symbol of an element represents one atom of that element.
e.g. Ca
= 1 calcium atom
A pitcher throws a baseball with a speed of 90 mi/s. Then the batter hits the ball at 110 mi/s in 2 seconds. What is the acceleration of the ball?
Answer:20 mi/s
Explanation:
2. Balance these chemical equations.
(a) SO₂ + O₂SO3
(b) NH3 + O₂N₂ + H₂O
(c) C4H10+ O₂ CO₂ + H₂O
(d) Pb(NO3)2 →PbO + NO₂ + O₂
(e) Al + Fe3O4 →→→ Al₂O3 + Fe
(f) Sr + H₂O-Sr(OH)₂ + H₂
The balanced chemical equation is [tex]\rm 2SO_2 + O_2 \rightarrow 2SO_3[/tex].
What is balanced chemical equation?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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Choose the list that shows the temperatures in order from warmest to coldest.
A) 11°F, 12°F, -11°F, -12°F
B) 12°F, 11°F, -12°F, -11°F
C) 12°F, 11°F, -11°F, -12°F
D) 12°F, -12°F, 11°F, -11°F
Answer: The answer would be C i think
Explanation:
What mass of each reactant would be needed to produce 100.0 kg of methanol in CO + H2 = CH3OH
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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