Answer:
A.) 1.845
Explanation:
You can find the pOH using the following equation:
pOH = -log[OH⁻]
Since NaOH dissociates into 1 Na⁺ and 1 OH⁻, the concentration of both ions is 0.0143 M.
pOH = -log[OH⁻]
pOH = -log[0.0143]
pOH = 1.845
For the reaction: 3 H2(g) + N2(g) <--> 2 NH3(g), the concentrations at equilbrium were [H2] = 0.10 M, [N2] = 0.10 M, and [NH3] = 5.6 M. What is the equilibrium constant (K)?
Group of answer choices
A. K = 3.1 x 105
B. K = 560
C. K = 5.6 x 10-4
D. K = 1.8 x 10-3
The equilibrium constant, k of the reaction in which case, the concentrations of the given reactants and products are as indicated is; Choice A; K = 3.1 x 10⁵
What is the equilibrium constant , k of the reaction as described in the task content?It follows from above that the concentrations of the reactants and products are as follows; [H2] = 0.10 M, [N2] = 0.10 M, and [NH3] = 5.6 M at equilibrium.
Hence, the equilibrium constant of the reaction in discuss is;
K = [5.6]²/[0.10]³[0.10]
k = 5.6² × 10⁴
k = 3.136 × 10⁵
K = 3.1 × 10⁵.
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How many isomers does propane have?
01
02
03
05
Answer:
A.) 1
Explanation:
Propane only exists in one conformation. It does not have enough carbons to form branches, and there are only hydrogens attached to each carbon. Furthermore, there is no way to twist the carbon or change its orientation (ex. cis- and trans-) to result in a different structure of propane. There is no other way to represent the molecule without drawing a different molecule.
Based on periodic trends and the data in the table above, which of the following is the most probable value for the ionic radius of K+?
Based on periodic trends, the most probable value for the ionic radius of K⁺ is 133 pm.
What are periodic trends?
Periodic trends are the observation which are seen in the chemical and physical elements found in the periodic table.
Periodic trends is based on the periodicity of elements.
Periodicity is the variation seen in the chemical and physical properties of the elements in the period table in a regular pattern, both down the groups and across the periods.
The periodic trends observed in metallic ions is that ionic radius of metallic ions increase down a group but decreases across a period.
Based on this periodic trend, the most likely size of the potassium ion, K⁺ is 133 pm.
In conclusion, the ionic radius of metallic ions increase down a group and decrease across a period.
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OMG PLEASE HELP!! THIS IS IMPORTANT!!
which statements describe the cell membrane? Check all that apply
A.) The cell membrane is very selective.
B.) The cell membrane lets anything enter the cell.
C.) The cell membrane lets anything leave the cell.
D.) The cell membrane is protective layer surrounding a cell.
E.) The cell membrane allows waste to leave the cell.
Answer:
The cell membrane is protective layer surrounding a cell.
Answer:
options D is correct
....hope it helps you
Given the reaction: A + B <--> C + D
The concentrations at equilibrium are [A] = 1 M, [B] = 1 M, [C] = 2 M, and [D] = 2 M. What is the value of the equilibrium constant (K)?
Group of answer choices
A. 4.0
B. 2.0
C. 1.0
D. 0.25
Answer:
A.) 4.0
Explanation:
The general equilibrium expression looks like this:
[tex]K = \frac{[C]^{c} [D]^{d} }{[A]^{a} [B]^{b} }[/tex]
In this expression,
-----> K = equilibrium constant
-----> uppercase letters = molarity
-----> lowercase letters = balanced equation coefficients
In this case, the molarity's do not need to be raised to any numbers because the coefficients in the balanced equation are all 1. You can find the constant by plugging the given molarities into the equation and simplifying.
[tex]K = \frac{[C]^{c} [D]^{d} }{[A]^{a} [B]^{b} }[/tex] <----- Equilibrium expression
[tex]K = \frac{[2 M] [2 M]}{[1 M] [1 M] }[/tex] <----- Insert molarities
[tex]K = \frac{4}{1 }[/tex] <----- Multiply
[tex]K = 4[/tex] <----- Divide
how do scientists believe that chloroplasts got into photosynthetic cells?
The development of chloroplast is thought to occur through endosymbiosis.
According to the endosymbiosis, some of the organelles found in modern eukaryotic cells, such as mitochondria and chloroplasts, were previously prokaryotic microorganisms. A non-photosynthetic creature acquired one photosynthetic cell, and the chloroplast was subsequently created.
An organelle known as a chloroplast is crucial to the process of photosynthesis in plants. It contains pigments like chlorophyll and other pigments that are in charge of capturing sunlight. Since each chloroplast has two membranes, other organelles such as mitochondria are referred to as double-membrane organelles. It is believed that cyanobacterial endosymbiosis played a role in the genesis of the chloroplast. Prokaryotic organisms like cyanobacteria have the capacity to prepare their food through the process of photosynthesis.
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Answer:what’s the answerr
Explanation:
Explain the scientific meaning and use of the word "transformation".
Transformation in chemistry is scientifically used to explain the process of changing one compound to another in a chemical reaction.
What is transformation?The word "transformation" has a very special significance in chemistry. We know that in English, to transform would simply imply to change from one form to another. This is not quite far from its meaning in the parlance of chemistry.
The word transformation is normally applied in the area of chemical reactions especially as it has to do with reaction with in organic chemistry. It has to do with the change from one molecule to another and this is of great importance in the discussion of synthetic chemistry.
As such, the word transformation in chemistry is scientifically used to explain the process of changing one compound to another in a chemical reaction.
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10 Points
The International Commission of Radiological Protection has set the limit for yearly radiation exposure at 1000 uSv. What is the risk
associated with this dose?
A. No risk at this limit or below.
OB. 1/2400 chance of cancer over a 40 year period.
OC. 1/1000 chance of cancer over a 40 year period.
OD. 1/100,000 chance of cancer over a 40 year period.
The maximum allowable annual dose of radiation has been set at 1000 uSv by the worldwide commission on radiological protection. At this threshold or lower, there is no risk.
What is S(sievert)?
The sievert, a measurement used to measure radiation, is used to calculate how much radiation is taken in by human tissues.1000 millisieverts are equal to one sievert (mSv) [ 1 Sv= 1000 mSv]. There are 1,000 microsieverts in a millisievert[ 1 mSv = 1000 uSv]Here are some details concerning the risks increasing radiation levels cause to our health:
Yukio Edano, Japan's Chief Cabinet Secretary, had said that radiation levels near the damaged facility on the northeast coast may rise to 400 millisieverts (mSv) per hour.The lowest dose of exposure that causes any rise in cancer probability is readily visible is 100 mSv per year. Five out of every 100 people exposed to a cumulative 1,000 mSv (1 sievert) may likely get a deadly malignancy several years later.The central nervous system, as well as the red and white blood cells, are destroyed by high radiation doses or acute radiation exposure. This impairs the immune system, making it difficult for the sufferer to fight off diseases.One sievert (1,000 mSv), for instance, only results in radiation sickness, which includes nausea, vomiting, and bleeding, but not death. About half of individuals exposed to a single dose of 5 sieverts would perish within a month.Therefore the correct choice is an option (A).
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Answer:
Answer D
Explanation:from founders Edtell :
A dose of 1000 uSv is believed to carry a 1/100,000 risk of getting cancer over 40 years due to your exposure to radiation. The average dose is around 2400 uSv.
The compound iron oxide can exist with either iron(II) ions or iron(III) ions. Conduct Internet research to learn about the differences between iron(II) oxide and iron(III) oxide. Give the chemical formula for each compound. Describe their appearance and uses. Based on your findings, are these two forms of the same compound, or are they two completely different compounds?
(What goes in the 6 empty spaces?)
Based on our finding these two compounds are not same they are completely different from each other as Formula of both compounds are different, their appearance is also different from each other.
What is Iron (II) Oxide ?The formula of the Iron II oxide is FeO. Common name of Iron (II) Oxide is Ferrous Oxide. Iron (II) Oxide is a black colored powder. The mineral form of Iron (II) oxide is known as Wustite. Iron (II) Oxide is used as a pigment. It is also used to make dyes.
What is Iron (III) Oxide ?The formula of the Iron (III) Oxide is Fe₂O₃. Common name of Iron (III) Oxide is Ferric oxide. Iron (III) Oxide appears as Red-Brown solid. It is also known as Hematite. Iron (III) oxide is used as pigments. It is used in dental composites , cosmetics. It is also used to apply the final polish on metallic jewellery.
Thus from the above conclusion we can say that Based on our finding these two compounds are not same they are completely different from each other as Formula of both compounds are different, their appearance is also different from each other.
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What is the [OH-] if the [H3O+] is 1 x 10 -6?
The answer is [OH⁻] = 1 x 10⁻⁸.
To find OH⁻, divide the ionic product of water by [H₃O⁺] as :
OH⁻ + H₃O⁺ = H₂O
[OH⁻] = 1 x 10⁻¹⁴ / 1 x 10⁻⁶[OH⁻] = 1 x 10⁻⁸The equilibrium expression for the the reaction:
H2(g) + I2(g) <--> 2HI(g) would be:
Group of answer choices
A. K = 2[HI] / [H2][I2]
B. K = [H2][I2] / [HI]2
C. K = [H2][I2] / 2[HI]
D. K = [HI]2 / [H2][I2]
Answer:
D.) [tex]K = \frac{[HI]^{2} }{[H_{2} ] [I_{2} ] }[/tex]
Explanation:
The general equilibrium expression looks like this:
[tex]K = \frac{[C]^{c} [D]^{d} }{[A]^{a} [B]^{b} }[/tex]
In this expression,
-----> K = equilibrium constant
-----> uppercase letters = formulas
-----> lowercase letters = balanced equation coefficients
In this case, all of the reactants and products are gases, so they should all be included in the expression. The products are in the numerator and the reactants are in the denominator. This makes the correct expression:
[tex]K = \frac{[HI]^{c}}{[H_{2} ]^{a} [I_{2} ]^{b} }[/tex] <----- Insert formulas
[tex]K = \frac{[HI]^{2}}{[H_{2} ] [I_{2} ] }[/tex] <----- Insert coefficients
1. A cell must continuously sort useful materials from its waste products and then remove or recycle the waste. One way a cell does this is to first put tiny tags on proteins that are no longer needed. These tags, which are small polypeptide chains 76 amino acids long, are called ubiquitin.
2. Ubiquitin tags direct proteins to compartments of the cell called proteasomes. Within each proteasome, ubiquitin-tagged proteins are deconstructed into their component amino acids. These pieces can be repurposed to build new proteins.
3. Sometimes organs stop processing waste effectively, allowing the waste to pile up and contributing to many diseases. Alzheimer's disease, for example, includes piles of waste proteins in the brain called tangles, while Parkinson's disease involves the accumulation of recyclable material into Lewy bodies. Mallory bodies are piles of waste proteins common in liver disease. These piles, known generically as inclusions, can be identified under the microscope because they are covered in tiny ubiquitin tags.
4. A problem in the breakdown of ubiquitin-tagged proteins may be one cause of spinocerebellar ataxia type 1. In this disease, a protein called ataxin-1 has an abnormal genetic mutation, and ubiquitin is able to attach to the mutant protein. Scientists believe that the mutated protein cannot be chopped up by the proteasome because of its shape, so ubiquitin-tagged ataxin-1 starts to accumulate, which leads to cell death. The cells most affected by this genetic mutation are neurons in a part of the brain associated with motor control and the spinal cord. So, a person with mutant ataxin-1 progressively loses muscle control as these cells die.
Which phrase describes the purpose of ubiguitin
A. to tag waste proteins for recycling in the proteasomes
B. to create small polypeptide chains that are 76 amino acids long
C. to create inclusions that can be identified under the microscope
D. to attach to mutant proteins so that they can accumulate In the cell
If proteins contain mutations, the proteins often do not maintain the proper shape and are unable to perform their functions. Properly functioning proteins are essential to maintaining healthy organisms.
Which statement describes the overall consequence of proteins containing mutations like those described in the passage?
A. Wastes will build up and will be reassembled to build new proteins.
B. Wastes will build up, and Mallory bodies will accumulate in the liver.
C. Wastes will build up in cells and will eventually be excreted from each cell.
D. Wastes will build up in vital organs, and the organism will experience disease.
Why do individuals with spinocerebellar ataxia experience loss of muscle control, even though the ataxin-1 protein builds up only In the brain and spinal cord?
A. Inclusions can build up in all body systems and can cause debilitating effects.
B. Genetic mutations in the ataxin-1 protein cause muscular proteins to change shape.
C. When the ubiquitin tagging system does not work effectively, cellular waste can build up in the muscles.
D. The neurons affected by the ataxin-1 protein buildup are in a region of the brain that manages muscle control.
Based on the role of ubiquitin in protein deconstruction as stated in the passage, the correct options are as follows:
to tag waste proteins for recycling in the proteasomes; option A.Wastes will build up in vital organs, and the organism will experience disease; option Dthe neurons affected by the ataxin-1 protein buildup are in a region of the brain that manages muscle control; option D.What are phrases?
Phrases refers to a group of words which contains a verb but which on their own do not make complete sense.
In the description of the role of Ubiquitin, it is described as a small polypeptide chain containing 76 amino acids. The main tole of ubiquitin is to tag proteins for deconstruction in the proteasomes.
Therefore, the phrase describes the purpose of ubiquitin is to tag waste proteins for recycling in the proteasomes; option A.
Based on the passage, the statement that describes the overall consequence of proteins containing mutations is: Wastes will build up in vital organs, and the organism will experience disease; option D
Individuals with spinocerebellar ataxia experience loss of muscle control, even though the ataxin-1 protein builds up only in the brain and spinal cord because the neurons affected by the ataxin-1 protein buildup are in a region of the brain that manages muscle control; option D.
In conclusion, mutations in ubiquitin-tagged proteins will result in accumulation in the body since they cannot be deconstructed in the proteasomes.
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What volume of hydrogen (in L) is produced
from the complete reaction of 56.49 g of
magnesium metal at STP?
(Mg = 24.30 g/mol)
Mg(s) + 2HCl(aq) → MgCl₂(aq) + H₂(g)
Hint: 1 mole of gas at STP occupies 22.4 L
Answer:
52.07 L H₂
Explanation:
Before you can find the volume of H₂, you need to find the moles of H₂. To do this, you need to (1) convert grams Mg to moles (via the atomic mass) and then (2) convert moles Mg to moles H₂ (via the mole-to-mole ratio from equation coefficients).
Atomic Mass (Mg): 24.30 g/mol
1 Mg(s) + 2 HCl(aq) ---> MgCl₂(aq) + 1 H₂(g)
^ ^
56.49 g Mg 1 mole 1 mole H₂
------------------- x ----------------- x -------------------- = 2.32 moles H₂
24.30 g 1 mole Mg
Now that you know the moles of H₂, you need to determine the volume at STP. To do this, you need to set up a proportion comparing the mole value versus the volume. Then, you can cross-multiply to solve for the unknown volume. The final answer should have 4 sig figs to match the given values.
1 mole 2.32 moles
-------------- = -------------------- <----- Set up proportion
22.4 L ? L
(1 mole) x ? L = 52.07 <----- Cross-multiply
? L = 52.07 <----- Divide both sides by 1 mole
Can someone please help me identify these functional groups? Please it’s extremely urgent
Answer:
See the image below for he circled and labeled functional groups.
*Keep in mind that all of the molecules technically contain alkanes.
Which Inorganic Substance has a melting point of -101°C and a boiling point of -35°C?
Group of answer choices
A. Chlorine
B. Hydrogen
C. Hydrogen Sulfide
D. Hydrogen Chloride
The inorganic substance that has a melting point of -101°C and a boiling point of -35°C is chlorine (option A).
What is melting and boiling point?Melting point is the temperature at which the solid and liquid phases of a substance are in equilibrium.
On the other hand, the boiling point is the temperature at which a liquid boils, with the vapor pressure equal to the given external pressure.
Chemical elements and compounds have specific boiling and melting points that distinguishes them chemically.
The following are the melting and boiling point of the given compound and elements respectively;
Chlorine - -101°C and -35°CHydrogen: -259.2°C and -252.9 °CHydrogen sulfide: -85.5 °C and -60°CHydrogen chloride: -114.2 °C and - 85°CTherefore, the inorganic substance that has a melting point of -101°C and a boiling point of -35°C is chlorine.
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A mixture of 0.600 mol of bromine and 1.600 mol of iodine is placed into a rigid 1.000-L container at 350°C.
Br2(g) + I2(g) ↔ 2IBr(g)
When the mixture has come to equilibrium, the concentration of iodine monobromide is 1.190 M. What is the equilibrium constant for this reaction at 350°C?
Show step-by step explanation.
A) 3.55 × 10^3
B) 1.24
C) 1.47
D) 282
E) 325
The equilibrium constant of the reaction is 282. Option D
What is equilibrium constant?The term equilibrium constant refers to the number that often depict how much the process is able to turn the reactants in to products. In other words, if the reactants are readily turned into products, then it follows that the equilibrium constant will be large and positive.
Concentration of bromine = 0.600 mol /1.000-L = 0.600 M
Concentration of iodine = 1.600 mol/1.000-L = 1.600M
In this case, we must set up the ICE table as shown;
Br2(g) + I2(g) ↔ 2IBr(g)
I 0.6 1.6 0
C -x -x +2x
E 0.6 - x 1.6 - x 1.190
If 2x = 1.190
x = 1.190/2
x = 0.595
The concentrations at equilibrium are;
[Br2] = 0.6 - 0.595 = 0.005
[I2] = 1.6 - 0.595 = 1.005
Hence;
Kc = [IBr]^2/[Br2] [I2]
Kc = ( 1.190)^2/(0.005) (1.005)
Kc = 282
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Which of the following properties allows water molecules to stick to othe types of molecules?
A) Viscosity
B) Adhesion
C) Surface Tension
D) Density
Answer:
B.) Adhesion
Explanation:
A.) is incorrect. Viscosity is a measure of internal friction that affects the fluidity of a liquid.
B.) is correct. Adhesion is the ability of water to stick to other substances (which are not water).
C.) is incorrect. Surface tension is the tension created by the bonds of the surface particles.
D.) is incorrect. Density is a ratio that compares mass to volume.
An oven-cleaning solution is 40.0% (by mass) NaOH.
If one jar of this product contains 458 g of solution, how much NaOH (by mass) does it contain?
The amount of NaOH by mass the jar contains will be 183.2 g
Percent compositionThe percent by mass of NaOH in the oven-cleaning solution is 40.0%.
This means that for every 100 g of the cleaning solution, there would be 40 g of NaOH.
Now, the jar in question contains 458 g of this solution which is 40.0% NaOH by mass.
The amount of NaOH in the jar can be calculated as:
40/100 x 458 = 183.2 g
This means that 458 g of the oven-cleaning solution that is present in the jar contains 183.2 g of NaOH.
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What volume, in liters, of 0.023 M NH4NO3 solution can be made using 25 g NH4NO3
The molar mass of NH4NO3 is 80.043 g/mol
Answer:
14 L
Explanation:
To find the volume, you need to (1) convert grams to moles (via molar mass) and then (2) calculate the volume (via molarity equation). The final answer should have 2 sig figs to match the sig figs of the given values.
(Step 1)
Molar Mass (NH₄NO₃): 80.043 g/mol
25 grams NH₄NO₃ 1 mole
------------------------------- x ------------------------- = 0.312 moles NH₄NO₃
80.043 grams
(Step 2)
Molarity = moles / volume
0.023 M = 0.312 moles / volume <----- Insert values
(0.023 M) x volume = 0.312 moles <----- Multiply both sides by volume
volume = 14 L <----- Divide both sides by 0.023
Volume, in liters, of 0.023 M NH₄NO₃ solution can be made using 25 g NH₄NO₃ are 13.47L.
What is Molarity?Molarity of a given solution is known as the total number of moles of solute per litre of the solution. A solution that is 1.00 molar (written 1.00 M) contains 1.00 mole of solute for every liter of solution.
Molarity = (No. of moles of solute ÷ Volume of solution in liters)
The unit of molarity is mol L⁻¹.
Molarity is temperature dependent because as temperature changes, volume of the solution also changes.
No. of moles of solute = Mass / Molar mass
No. of moles of solute = 0.31
Hence,
Volume of solution in liters = No. of moles of solute ÷ molarity
= 13.47 litres
Therefore, Volume, in liters, of 0.023 M NH₄NO₃ solution can be made using 25 g NH₄NO₃ are 13.47L.
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Can someone please convert this for brainiest answer
2.4 x 10^24 atoms c to grams
Answer:
48 g C
Explanation:
To find the grams, you need to (1) convert atoms to moles (using Avogadro's Number) and then (2) convert moles to grams (using atomic mass). It is important to arrange the conversions in a way that allows for the cancellation of units. The final answer should have 2 sig figs to match the sig figs of the given value.
Avogadro's Number:
6.022 x 10²³ atoms = 1 mole
Atomic Mass (C): 12.011 g/mol
2.4 x 10²⁴ atoms C 1 mole 12.011 g
----------------------------- x -------------------------------- x --------------- = 48 g C
6.022 x 10²³ atoms 1 mole
How many molecules of H₂S are required to form 79.0 g of sulfur according to the following reaction? Assume excess SO2.
2 H₂S(g) + SO2(g) → 3 S(s) + 2H₂O(1)
Answer:
9.89 x 10²³ molecules H₂S
Explanation:
To find the molecules of H₂S, you need to (1) convert grams S to moles S (via the atomic mass of sulfur), then (2) convert moles S to moles H₂S (via the mole-to-mole ratio from equation coefficients), and then (3) convert moles H₂S to molecules H₂S (via Avogadro's Number). It is important to arrange the ratios/conversions in a way that allows for the cancellation of units. The final answer should have 3 sig figs to match the sig figs of the given value.
Atomic Mass (S): 32.065 g/mol
2 H₂S(s) + SO₂(g) -----> 3 S(s) + 2 H₂O(l)
Avogadro's Number:
6.022 x 10²³ molecules = 1 mole
79.0 g S 1 mole 2 moles H₂S 6.022 x 10²³ molecules
--------------- x --------------- x ---------------------- x ------------------------------------- =
32.065 g 3 moles S 1 mole
= 9.89 x 10²³ molecules H₂S
=> The approximate mss of an electron is 1/10²⁷ g , Calculate the uncertainty in its velocity if the uncertainty in its position were of the order of 1/10¹¹ m ( h = 6.6 × 1/10³⁴ kg m² per sec ) ..
Answer:
Δx(m.Δv)=h/4π
here ,
Δv = uncertainty in velocity
10−11×10−27×Δv=6.626×10−34/4×22/7
=5.25×103ms−1
[tex]{ \qquad\qquad\huge\underline{{\sf Answer}}} [/tex]
Here we go ~
According to Heisenberg's uncertainty principle :
[tex]\qquad \sf \dashrightarrow \: \Delta x \Delta p \geqslant \cfrac{h}{4 \pi} [/tex]
[tex]\qquad \sf \dashrightarrow \: \Delta x \cdot m \Delta v \geqslant \cfrac{h}{4 \pi}[/tex]
[tex]\qquad \sf \dashrightarrow \: \Delta v \geqslant \cfrac{h}{4 \pi \cdot m \Delta x}[/tex]
[tex]\qquad \sf \dashrightarrow \: \Delta v \geqslant \cfrac{6.6 \times 10 {}^{ - 34} }{4 \pi \cdot 10 {}^{ - 27} \times 10 {}^{ - 3} \times 10 {}^{ - 11} }[/tex]
[tex] \textsf{ [ we took } [/tex][tex]{ {10}^{-3} } [/tex][tex] \textsf{because mass of electron is} [/tex][tex] \textsf{ given in grams that need to be converted into kg ]} [/tex]
[tex]\qquad \sf \dashrightarrow \: \Delta v \geqslant \cfrac{6.6 }{4 \pi } \times \cfrac{10 {}^{ - 34} } {10 {}^{ (- 27 - 3 - 11)} } [/tex]
[tex]\qquad \sf \dashrightarrow \: \Delta v \geqslant \cfrac{6.6 }{4 \times 3.14 } \times \cfrac{10 {}^{ - 34} } {10 {}^{ - 41} } [/tex]
[tex]\qquad \sf \dashrightarrow \: \Delta v \geqslant \cfrac{6.6 }{4 \times 3.14 } \times {10 {}^{ 7}}[/tex]
[tex]\qquad \sf \dashrightarrow \: \Delta v \geqslant \cfrac{6.6 }{12.56 } \times {10 {}^{ 7}}[/tex]
[tex]\qquad \sf \dashrightarrow \: \Delta v \geqslant0.525\times {10 {}^{ 7}}[/tex]
[tex]\qquad \sf \dashrightarrow \: \Delta v \geqslant5.25\times {10 {}^{ 6}} \:\:m/s[/tex]
Based upon the ion charge of the following polyatomic ions, predict the formula for the following compounds.
sulfate = SO42
phosphate = PO43
hydroxide OH-
sodium hydroxide
O Na(OH)2
O Na(OH)3
O Na₂OH
O NaOH
Answer:
D.) NaOH
Explanation:
Sodium always forms the cation, Na⁺.
Hydroxide is always written as OH⁻.
The compound should have an overall charge of 0 (be neutral). As you can see, the charges perfectly balance out (+1 + (-1) = 0). Therefore, there only needs to be one atom of each ion. The ionic compound is thus NaOH.
For the following questions state the oxidation number of the element in the given compound.
1. sul fur in Li2SO#3
2. chlorine in MgCl2
3.Silicon in SiO2
4.sul fur in H2SO4
5.Sulfur in SO4^2-
6. manganese in MnO4^-
7. Cr in Cr2O7^2-
in the periodic tables
elements in the same column have the same charge
in a compound oxidation numbers have to equal 0
1.
sulfur in Li2SO3
charges :
Li = +1 S = +4 O = -2
multiply the charge with the subscripted number next to the element
Li = +1
Li2 = +2
O = -2
O3 = -8
in a compound oxidation numbers have to equal 0
+2 S -6 = 0
S -4 = 0
S = +4
Sulfur = +4
2.
MgCl2
Mg = +2
+2 Cl2 = 0
Cl2 = -2
Cl by itself = -2 divided by 2 = -1
Chlorine = -1
3.
SiO2
Silicon = +4
4.
Sulfur in H2SO4
H: +1 S: +6 O: -2
H2SO4
H2 : +2 O4: -8
+2 +S -8 = 0
S - 6 = 0
S = +6
Sulfur = +6
5.
Sulfur in SO4^2-
Sulfur in SO4
Sulfur = +4
6.
Manganese in MnO4^-
Manganese in MnO4
Manganese = +4
7.
Cr2O7^2-
Dichromate
Cr in Cr2O7^2- or Cr2O7-2-
Cr: +6 O: -2
QUESTION 16
What is the product of the following reaction?
+ H₂(g) → ?
Answer:
n2(g)+3h2(g)→2nh3(g) balanced
Explanation:
Wayne Breslyn
How much heat is added if .1915g of water increases in temperature by .592 degrees C
Which element has an electron configuration of 1s22s22p63s23p3 ?
Group of answer choices
A. Silicon
B. Nitrogen
C. Arsenic
D. Phosphorus
Answer:
D. phosphorusExplanation:
Greetings !
The electronic configuration 1s²,2s²,2p⁶,3s²,3p³ represents phosphorus with atomic number 15.
The electron configuration 1s², 2s², 2p⁶, 3s², 3p³ corresponds to the element phosphorus. The first two shells are full, with 2 electrons in each shell. The third shell has 2 electrons in the 3s subshell and 3 electrons in the 3p subshell. Hence option D is correct.
Phosphorus is a chemical element with the symbol P and atomic number 15. It belongs to Group 15 (or Group V) of the periodic table, which is also known as the nitrogen group. Here are some key features and characteristics of phosphorus:
Phosphorus is a non-metal, and at room temperature, it exists in several allotropes. The most common forms are white phosphorus, red phosphorus, and black phosphorus.
White phosphorus is a highly reactive and toxic waxy solid, while red phosphorus is less reactive and is often used in safety matches. Black phosphorus is a semiconductor material with interesting electronic properties.
Therefore option D) phosphorous is correct.
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How could you prepare 4-methyl-3-hexanone from ketone containing no more than six carbon atom?
First base abstract a proton from acidic hydrogen gives carbanion.
What is a carbon atom?
A carbon chain's fundamental carbon atoms are those at each end. For instance, butane contains two basic carbon atoms. A secondary carbon atom, represented by the symbol 2°, is a carbon atom joined to two more carbon atoms.The first electron shell of carbon has two electrons, whereas the second one contains four of the available eight spaces. Carbon has two electron shells. Atoms share their outermost shell's electrons when they combine to form bonds. Since the outer shell of carbon has four vacant spaces, it can form bonds with four additional atoms.The first two electrons fill the inner shell, which is the conduction (inner) shell, and the remaining four are left in the second shell, which is the valence (outer) shell because carbon has an atomic number of six (six protons and six electrons in a neutral atom).Here First base abstract, a proton from acidic hydrogen gives carbanion
Which undergoes enolate form, then it reacts with CH3I, gives4-methyl-3-hexanone as below:
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2C2H2(g)+5O2(g)=4CO2(g)+2H2O(g)
How many liters of C2H2 are required to product 12.0 moles CO2, assuming the reaction is at STP?
The volume of ethyne, C₂H₂ required to produce 12 moles of CO₂ assuming the reaction is at STP is 134.4 L
Balanced equation2C₂H₂(g) + 5O₂(g) --> 4CO₂(g) + 2H₂O(g)
From the balanced equation above,
4 moles of CO₂ were produced by 2 moles of C₂H₂
How to determine the mole of C₂H₂ needed to produce 12 moles of CO₂From the balanced equation above,
4 moles of CO₂ were produced by 2 moles of C₂H₂
Therefore,
12 moles of CO₂ will be produce by = (12 × 2) / 4 = 6 moles of C₂H₂
How to determine the volume (in L) of C₂H₂ needed at STPAt standard temperature and pressure (STP),
1 mole of C₂H₂ = 22.4 L
Therefore,
6 moles of C₂H₂ = 6 × 22.4
6 moles of C₂H₂ = 134.4 L
Thus, we can conclude that the volume of C₂H₂ needed for the reaction at STP is 134.4 L
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The Haber process is a method to produce ammonia from hydrogen and nitrogen gases. The reaction is:
N2(g) + 3 H2(g) <--> 2 NH3(g)
If hydrogen gas is added after the reaction has reached equilibrium, the reaction will:
Group of answer choices
A. Need more information
B. Stop. All of the nitrogen gas has been used up.
C. Shift to the left to produce more reactants
D. Shift to the right to produce more product
Answer:
D.) Shift to the right to produce more product
Explanation:
When more reactants are added to a reaction, the equilibrium will shift to the product side to restore the balance.
As such, when H₂ (a reactant) is added, the reaction will shift to the product side, resulting in an increase of NH₃.
