Answer:
bent
Explanation:
The chlorite ion has been pictured in the image attached with its two main resonance contributors.
The ion has four regions of electron density as shown. On the basis of the VSEPR theory, we expect a tetrahedral geometry.
However, the ion is bent due to the effect of the lone pairs on chlorine which is the central atom in the ion. This distorts the bond angle of the ion hence the ion has a bent molecular geometry.
the uneven heating of the atmosphere by the sun's energy creates pressure
REG: ED 101/6/12062
Course Code:
.
1. Using appropriate chemical equations, explain stellav nucleosynthe
sis of elements; o Ne, Na and Mg ( 6 Marks).
Answer:
See explanation
Explanation:
Nucleosynthesis is the process that creates new atomic nuclei from pre-existing ones via nuclear reactions.
A nuclear reaction involves the nucleus of atoms. It means the transformation of one element to another.
In the image attached i have shown the equations representing the nucleosynthesis of O, Ne, Na and Mg.
The nucleosynthesis of O involves the bombardment of C-12 with alpha particles, gamma rays are produced.
The nucleosynthesis of Ne involves the bombardment of O-16 with alpha particles, gamma rays are produced.
The nucleosynthesis of Na involves the bombardment of Ne-20 with alpha particles, protons are produced.
The nucleosynthesis of Mg involves the bombardment of Ne-20 with alpha particles, gamma rays are produced.
Methanol has a normal boiling point of 64.6C and a heat of vaporization of 35.2 kJ/mol. What is the vapor pressure (in Torr) of methanol at 12.0C
Answer:
vapor pressure of methanol at 12.0C = 75.09 torr
Explanation:
Using Clausius Clapeyron equation
, we have that
ln (P2/P1)= (ΔHvap /R) (1/T1 - 1/T2)
Given
At Normal boiling point,
Temperature T1= 64.6°C = 64.6 + 273 = 337.6 K, Pressure,P1 = 1 atm
Heat of vaporization = 35.2 kJ/mol
Changing to J/mol
=35.2 x 1000= 35200 J/mol
Temperature , T2 = 12.0oC = 12 + 273 = 285 K
Using gas constant, R = 8.314 J/mol.K
ln (P2/P1)= -(ΔHvap /R) (1/T1 - 1/T2)
ln (P2/ 1 atm) = (35200 J/mol/ (8.314 J/mol.K) X( 1/337.6 - 1/285)
ln (P2/ 1 atm) =4,233.822 X (0.00296-0.003508)
ln (P2/ 1 atm) = 4,233.822468 x-0.0005466866
ln (P2/ 1 atm)= -2.31457
P2 = e^⁻2.31457 x 1 atm
P2=0.098808atm
= 0.098808atm x760 = 75.09 torr
Given that 2Al(s) + 3 2 O2(g) → Al2O3(s)
ΔH o rxn = −1601 kJ/mol and
2Fe(s) + 3 2 O2(g) → Fe2O3(s)
ΔH o rxn = −821 kJ/mol
calculate the standard enthalpy change for the following reaction:
2Al(s) + Fe2O3(s) → 2Fe(s) + Al2O3(s)
Answer:
ΔH°rxn = -780kJ
Explanation:
It is possible to find enthalpy change of a reaction by the sum of analogue reactions (Hess's law).
Using the reactions:
1. 2Al(s) + 3/2O2(g) → Al2O3(s) ΔH°rxn = −1601 kJ/mol
2. 2Fe(s) + 3/2O2(g) → Fe2O3(s) ΔH°rxn = −821 kJ/mol
1 - 2:
2Al(s) + Fe2O3(s) → Al2O3(s) + 2Fe(s)
ΔH°rxn = ΔH°rxn(1) - ΔH°rxn(2)
ΔH°rxn = −1601 kJ/mol - (-821 kJ/mol)
ΔH°rxn = -780kJ
Considering the Hess's Law, the enthalpy change for the reaction is -780 kJ.
Hess's Law indicates that the enthalpy change in a chemical reaction will be the same whether it occurs in a single stage or in several stages. That is, the sum of the ∆H of each stage of the reaction will give us a value equal to the ∆H of the reaction when it occurs in a single stage.
In this case you want to calculate the enthalpy change of:
2 Al(s) + Fe₂O₃(s) → 2 Fe(s) + Al₂O₃(s)
which occurs in two stages.
You know the following reactions, with their corresponding enthalpies:
Equation 1: 2 Al(s) + [tex]\frac{3}{2}[/tex] O₂(g) → Al₂O₃(s) ΔH = −1601 kJ/mol
Equation 2: 2 Fe(s) + [tex]\frac{3}{2}[/tex] O₂(g) → Fe₂O₃(s) ΔH = −821 kJ/mol
Because of the way formation reactions are defined, any chemical reaction can be written as a combination of formation reactions, some going forward and some going back.
Firs stepTo obtain the enthalpy of the desired chemical reaction you need 2 moles of Al(s) on reactant side and it is present in first equation so let's write this as such.
Secod stepNow, 1 mole of Fe₂O₃(s) must be a reactant and is present in the second equation. Since this equation has 1 mole of Fe₂O₃(s) on the product side, it is necessary to locate the Fe₂O₃(s) on the reactant side (invert it). When an equation is inverted, the sign of ΔH also changes.
In summaryYou know that two equations with their corresponding enthalpies are:
Equation 1: 2 Al(s) + [tex]\frac{3}{2}[/tex] O₂(g) → Al₂O₃(s) ΔH = −1601 kJ/mol
Equation 2: Fe₂O₃(s) → 2 Fe(s) + [tex]\frac{3}{2}[/tex] O₂(g) ΔH = 821 kJ/mol
Adding or canceling the reactants and products as appropriate, and adding the enthalpies algebraically, you obtain:
2 Al(s) + Fe₂O₃(s) → 2 Fe(s) + Al₂O₃(s) ΔH= -780 kJ
Finally, the enthalpy change for the reaction is -780 kJ.
Learn more:
brainly.com/question/5976752?referrer=searchResults brainly.com/question/13707449?referrer=searchResults brainly.com/question/13707449?referrer=searchResults brainly.com/question/6263007?referrer=searchResults brainly.com/question/14641878?referrer=searchResults brainly.com/question/2912965?referrer=searchResultsWhich of the following is NOT a level of organization in an ecosystem? a. community c. population b. ecosystem d. all of the above are levels of organization
Answer:
d. all of the above are levels of organization
Explanation:
The followings are the levels of the organization in an ecosystem
1. Individual
2. Population
3. Community
4. Ecosystem
5. Biome
6. Biosphere
So as per the given situation, it involved all three levels that are mentioned in the question
hence, the correct option is d.
Therefore the same is to be considered
The given option are all consisting in the level of organization of ecosystem. Thus, option D is correct.
The ecosystem has been the geographical representation comprising plants, animals, and other biotic and abiotic components.
The ecosystem has been organized in the levels for the understanding of the working and the activity of the ecosystem. The levels of the ecosystem has been:
IndividualPopulationCommunityEcosystemBiomeBiosphereThe organizational levels of the ecosystem have been comprised of community, population, and ecosystem. Thus all the given are level or organizations in the question. Thus, option D is correct.
For more information about the ecosystem, refer to the link:
https://brainly.com/question/1673533
3) What will be the molecular mass of gas,11.2l of which at NTP weight 14 gm?
Answer:
30 g/mol
Explanation:
Step 1: Given data
Volume of the gas at NTP: 11.2 LMass of the gas: 14 gStep 2: Calculate the moles corresponding to 11.2 L of gas
At normal temperature and pressure (1 atm, 293.15 K), 1 mol of a gas has a volume of 24.05 L.
11.2 L × 1 mol/24.05 L = 0.466 mol
Step 3: Calculate the molecular mass of the gas
0.466 moles of the gas weigh 14 g. The molecular mass is:
M = 14 g/0.466 mol = 30 g/mol
Calculate the wavelength of a radio wave with a frequency of 102.7 x 10^6 s^-1
Determine the frequency of light whose wavelength is 5.267 nm.
Answer:
λ = 0.029×10² m
f = 0.57×10¹⁷ s⁻¹
Explanation:
Given data:
Wavelength of wave = ?
Frequency of wave = 102.7×10⁶ s⁻¹
Solution:
Formula:
Speed of wave = Wavelength × Frequency
speed of wave = 3×10⁸ m/s
by putting values,
3×10⁸ m/s = λ × 102.7×10⁶ s⁻¹
λ = 3×10⁸ m/s / 102.7×10⁶ s⁻¹
λ = 0.029×10² m
2nd)
Given data:
Wavelength of wave = 5.267 nm (5.267×10⁻⁹ m)
Frequency of wave = ?
Solution:
Formula:
Speed of wave = Wavelength × Frequency
speed of wave = 3×10⁸ m/s
by putting values,
3×10⁸ m/s = 5.267×10⁻⁹ m × f
f = 3×10⁸ m/s / 5.267×10⁻⁹ m
f = 0.57×10¹⁷ s⁻¹
Why did the author refer to bone marrow cells as “drugstore cells”?
Answer:
because the cells make drugs at the start of injury!
In the free radical chlorination of methylcyclopentane, what is the total number of distinct monochlorinated compounds, including stereoisomers, that would be formed?
A) 4
B) 6
C) 8
D) 10
Answer:
B) 6
Explanation:
Methylcyclopentane consist of 3 types of hydrogen which are 1° (primary), 2° (secondary) and 3° (tertiary) hydrogen atoms. In the chlorination of methylcyclopentane, there are four monochlorinated products possible and two stereoisomers.
I need help plz before 12:18 because my teacher did she was going to Fall me
Answer:
You are right, it is the Engineer
Explanation:
What is the condensed structural formula of C7H8N4O2
Answer:
C7H8N4O. The molecular formula C7H8N4O2 (molar mass: 180.16 g/mol) may refer to: Paraxanthine. Theobromine.
A minority of elements on the right side of the periodic table that tend to form the negative charges
Answer:
Wrong
Explanation:
Because they are non metals and tends to form negative charged ions
Which form of asexual reproduction describes the process of a cell dividing to
produce a copy?
A. Binary fission
B. Budding
C. Fragmentation. PLS I NEED HELP
D. Amputation
PLS I NEED HELP
Answer:A
Explanation:Binary Fission, meaning ‘getting divided into half’ is a type of asexual reproduction where a single living cell grows twice its size and then splits to form two identical daughter cells, each carrying a copy of the parent cell’s genetic material. Examples of cells that use binary fission for division
Answer:
i think its a
Explanation:
Which of the following are products of the reaction listed? Zn + 2HCI
ZnCl2 + H2
H2
HCI
ZnCl2
Zn
Answer:
uh A.)? [ZnCI2+H2]? /////////
Two identical sister chromatids are held together at what
region on a duplicated chromosome?
a Chromatin
b Centromere
C Centriole
Check it
454 grams of isomaltitol, C12H24O11, was combusted in a furnace completely in an excess oxygen. The products of this reaction are water and carbon dioxide. What is the theoretical yield (in kilograms) of water produced from this reaction?
The theoretical yield (in kilograms) of water produced from this reaction : 0.285 kg
Further explanationReaction
2C₁₂H₂₄O₁₁ + 25O₂ → 24CO₂ + 24H₂O
mass of C₁₂H₂₄O₁₁ - isomaltitol = 454 g
mol C₁₂H₂₄O₁₁(MW=344.31 g/mol) :
[tex]\tt mol=\dfrac{mass}{MW}\\\\mol=\dfrac{454}{344.31 g/mol}\\\\mol=1.319[/tex]
mol H₂O based on C₁₂H₂₄O₁₁ as limiting reactant(O₂-oxygen as an excess)
From the equation above, mol ratio of C₁₂H₂₄O₁₁ : H₂O = 2 : 24, so mol H₂O:
[tex]\tt mol~H_2O=\dfrac{24}{2}\times 1.319=15.828[/tex]
then mass H₂O (MW=18 g/mol) :
[tex]\tt mass=mol\times MW\\\\mass=15.828\times 18=284.904~g=0.285~kg[/tex]
20. Rank the following elements from the smallest to largest ionization energy:
a. Sulfur, Oxygen, Polonium, Selenium
Answer:
Polonium
Selenium
Sulfur
Oxygen
Explanation:
If you see in the Table S of the periodic Table there is a column that says First Ionization Energy (kJ/mol) and you can see the numbersof these elements so then you just put it in order
Polonium 812
Selenium 941
Sulfur 1000
Oxygen 1314
Which of the following statements is true?
a. Atechnological society has no impact on the environment.
b. Atechnological society has a completely positive impact on the environment.
C. Atechnological society has both a positive and negative impact on the environment
d. Atechnological society has a completely negative impact on the environment.
Please select the best answer
Answer:
C. A technological society has both a positive and negative impact on the environment
Explanation:
It is correct to suggest and to acclaim that a technological society has both a positive and negative impact on the environment.
The environment is the region of space where living organisms and non-living components can be found.
Technology no doubt has opened up our knowledge about the environment. We are now aware of very topical issues that affects the environment and how to combat them. On the other side, technological advance has also bode poorly for the environment. New chemical wastes generated by industrial processes have proven very costly to the environment.We see that technology has both negative and positive effects on the environment.
Which two factors often determine the type of rock that is formed by a process?
A.The type of material that is present at the beginning of the process
B.The amount of time the process of rock formation takes
C.The season in which the rock formation process ends
D.Whether the process takes place north or south of the equator
Answer:
A and B
Explanation:
Trust me I just did it on a p e x
Answer: he’s correct it’s d and b for me but it’s the same answers
Explanation:
How many atoms are there in 4500 grams of sulfur(s)?plaease help
Answer: The Avagadro constant = 6.022 x 10²³ denotes the no of molecules in one mole of the substance
Explanation:
rap music to hype up on bus to game
Answer:
Ram Ranch
Explanation:
Answer: FLEXUP by lil yacthy and future and playboi carti one of the best songs right now
Explanation:
5. What is the distance of something from side to side?
Answer:
Distance of something it can be any type of distance
bruh i need help and someone just used the last one for points plz help
Answer: 5000
Explanation:
What is the molality of a D-glucose solution prepared by dissolving 36.0 g of D-glucose, C6H12O6, in 125.9 g of water
Answer:
1.59 molal
Explanation:
The definition of molality is:
molality = moles solute / kg of solventSo first we calculate the moles of solute (D-glucose, C₆H₁₂O₆), using its molar mass:
36.0 g C₆H₁₂O₆ ÷ 180.156 g/mol = 0.200 mol C₆H₁₂O₆Then we convert grams of water into kg:
125.9 g H₂O * [tex]\frac{1kg}{1000g}[/tex] = 0.1259 kg H₂OFinally we calculate the molality:
m = 0.200 mol / 0.1259 kgm = 1.59 mNeed help please....
What is the mass of a single bromine molecule, Br2?
The mass of a single bromine molecule, Br₂ is 2.654 x 10⁻²² g.
Bromine is a diatomic element. It has a symbol Br and the atomic number is 35. Bromine is a naturally occurring element which is liquid at room temperature.
Molar mass of Br₂ is 159.808 g/mol. The molar mass of bromine is 79.904 g/mol. In Br₂, there are two bromine atoms.
To calculate the mass of a single bromine molecule -
In 1 mole of Br₂, there is Avogadro's number of molecules.
Avogadro's number = 6.022 x 10²³
Therefore, 1 mole = 6.022 x 10²³
1 mole of bromine has mass of 79.9 g/mol
So, it gives us -
1/6.022 x 10²³ = 1.66 x 10²³/79.9 = 2.654 x 10⁻²²g
For the mass of a single bromine molecule, Br₂ = 2.654 x 10⁻²² g
To learn more about bromine,
brainly.com/question/9080164
#SPJ1
How many grams are there in 4.4 moles of calcium, Ca?
Answer:
180 g Ca
General Formulas and Concepts:
Chemistry - Atomic Structure
Reading a Periodic TableUsing Dimensional AnalysisExplanation:
Step 1: Define
4.4 mol Ca
Step 2: Identify Conversions
Molar Mass of Ca - 40.08 g/mol
Step 3: Convert
[tex]4.4 \ mol \ Ca(\frac{40.08 \ g \ Ca}{1 \ mol \ Ca} )[/tex] = 176.352 g Ca
Step 4: Check
We are given 2 sig figs. Follow sig fig rules and round.
176.352 g Ca ≈ 180 g Ca
What is the Systematic name for the compound SECI2
Answer: selenium dichloride
Explanation:
The bond angles increase steadily in the series PF3, PCl3, PBr3, and PI3. Using the concepts that you have learned in chapters 7-10, explain this observation.
Answer:
See explanation
Explanation:
Electronegativity is the ability of an atom in a molecule to attract the shared electrons of a covalent bond towards itself. Electronegativity is a trend that increases across the period and decreases down the group in the periodic table.
All the compounds listed are halides of phosphorus. The electronegativity of halogens decrease in the order; F> Cl> Br > I. Hence F has the greatest electronegativity in the group. It decreases as atomic and ionic radius increases.
As the electronegativity of the halogen atom decreases, the electron pair on the halogen atom lie closer to the central phosphorus atom hence the repulsion between electrons increases and so does the bond angle increase likewise.
An alkane with 15 carbons must contain how many hydrogens?
34
32
30
Answer:
It should contain 32 hydrogen.