Of all the elements in the periodic table, nitrogen has one of the highest electronegative energies.
How do hydrogen bonds and electronegativity relate?
4 to 50 kJ per mole are the strengths of hydrogen bonds. As a result of the significant difference in electronegativity between the H atom and the N, O, or F atoms in molecules with N-H, O-H, or F-H bonds, the covalent connection between the H atom and these atoms is extremely polar (i.e., a bond dipole).
Electronegativity
Numerous techniques have been devised to quantitatively assess an element's tendency to gain or lose electrons since it is crucial to comprehend an element's chemistry to know whether it does so more frequently or less frequently. An element termed electronegativity is a component of the most crucial approach
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Based on relative bond strengths , classify these reactions as endothermic (energy absorbed) or exothermic (energy released ).
Endothermic ;
Exothermic;
Strongest Bond A-B A-A B-B C-C B-C A-C Weakest Bond A2+C2 -> 2AC B2 +C2 -> 2BC A+BC -> AB+C A2+B2 -> 2AB AB+C -> AC+B
1. Endothermic
2. Exothermic
3. Endothermic
4. Endothermic
5. Exothermic
A reaction that emits heat and has a net negative standard enthalpy change is said to be exothermic. Any combustion procedure, iron rusting, and water freezing are a few examples. Exothermic reactions are those in which heat-based energy is released into the surrounding environment. If heat is absorbed by the system from the environment, the reaction or physical change is endothermic. As a result of the system absorbing heat from its surroundings during an endothermic process, the environment cools.
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Partial bonding, for example, as part of a resonance hybrid, often results in structures with _____.
Fractional bond orders are frequently produced by partial bonding, such as when it's a component of a resonance hybrid.
Resonance: What does that mean?Excitation frequency in physics when an unseen force or a buzzing system causes another system close by to vibrate more intensely at a specific operating frequency.
In the actual world, what is resonance?Any system with a natural frequency has the potential to experience resonance. You've probably encountered a rattle or hum in your automobile that only happens when traveling at a specific pace. This is an illustration of resonant; when you alter your speed, the period of a cyclical driving force the tires provide changes.
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4. Explain why diisopropylamine is a stronger base than aniline nh2 diisopropylamine aniline.
Answer: Cyclohexylamine is a stronger base than aniline because in aniline electron pair is involved in conjugation, which makes the electron pair unavailable, where as in cyclohexyl amine, the −NH
2
group is out side the ring and there is no resonance in the ring also, thereby the lone pair present on the nitrogen is freely available, resulting in a stronger base.
Explanation: I dont have one...
how many grams of water will be produced when 2.9 moles of ethanol (ch3ch2oh) are burned completely? enter a number only (no units) and express your answer using three significant figures.
The 156 gram of water produced from combustion of 2.9 moles of ethanol.
C₂H₅OH + 3O₂ ⇒2CO₂ + 3 H₂O
Given
Moles of ethanol taken = 2.9
Since 1 mole of ethanol produce water = 54gram
2.9 moles of ethanol produce water = 2.9 x 54 g
= 156 gram water produced
It should be emphasized that oxygen is necessary for the burning of ethanol. Although it won't happen right away, see carbon dioxide atmospheric residence time for more information on how quickly CO2 will be absorbed by plant matter. An exothermic reaction is one in which the burning of alcohol produces heat energy.
Hence, ethanol undergoes combustion to form carbon dioxide and water.
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fatty acids are subdivided into two major classes, based on the relative numbers of hydrogen and carbon atoms they contain. what are these two classes
Most of the herbal fatty acids have a fair wide variety of carbon atoms, because their biosynthesis involves acetyl-CoA, a coenzyme wearing a -carbon-atom institution.
As the quantity of carbons in a fatty acid chain increases, so does the melting point as illustrated in the determine below. thus, shorter chain fatty acids are more likely to be liquid, whilst longer chain fatty acids are more likely to be solid at room temperature (20-25ᐤC, 68-seventy sevenᐤF).
Fatty acids are categorised according to the presence and wide variety of double bonds of their carbon chain. Saturated fatty acids (SFA) comprise no double bonds, monounsaturated fatty acids (MUFA) comprise one, and polyunsaturated fatty acids (PUFA) comprise more than one double bond.
Fatty acids may be divided into four fashionable classes: saturated, monounsaturated, polyunsaturated, and trans fats. Saturated fatty acids and trans fat are related to an improved hazard of coronary heart ailment.
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calculate the height of a column of ethylene glycol that would be supported by atmospheric pressure (760 mmhg). the density of ethylene glycol is 1.2 g/ml
The height of column of ethylene glycol supported by atmospheric pressure is 63.33m.
Given -
P= 760 mm Hg
p=1.2g/ml
Principle-
Any liquid can be used with this equation, not just mercury.The liquid's surface is being pressed against by atmospheric pressure. The liquid's weight is determined by the column's height and density; gravity then adds to this weight and pulls the liquid down. As a result, the downward forces on the opposing side balance the upward forces on the one side.The height of the water column supported by atmospheric pressure, which is approximately 10 meters, can be calculated by substituting the values for water.Calculations-
[tex]Pressure =hpg[/tex]Rearranging this equation [tex]h=\frac{Pressure}{pg}[/tex]h=760/1.2 x 10
h=760/12
=63.33 m
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household bleach is an aqueous solution that contains 5.0% sodium hypochlorite (naocl, 74.44 g/mol) by mass. calculate the molarity of the solution that results when you dilute 10.0 ml of bleach by the addition of 100.0 ml water. assume that the density of bleach is 1.00 g/ml.
The molarity of the solution that results when making dilution from 10.0 ml of bleach by the addition of 100.0 ml water is 0.061 M.
This problem is about stoichiometry. First, we have to calculate the mass of the bleach.
The volume of bleach = V = 10.0 mLThe density = ρ = 1.00 g/mLThe mass of the bleachFrom the bleach, we can calculate the mass of sodium hypochlorite.
Mass of the bleach = m = 10.0 gThe percentage = 5.0%The mass of sodium hypochlorite = m₁[tex]percentage \:=\: \frac{m_1}{m} \times 100\%[/tex]Then we can calculate the number of moles of sodium hypochlorite.
m₁ = 0.5 gramsMolar mass NaOCl = Mr = 74.44 g/molThe number of molesThe molarity for NaOCl
n = 0.0067 molVolume total for the solution
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: at low ph you may have seen high absorbance even in the control samples that never had the enzyme added to them. why? what is causing the production of glucose in these samples?
A Spectrophotometer measures enzyme activity by measuring the rate at which absorbance change. Absorbance means to measure the concentration of the product of an enzyme reaction.
How does low ph causes high absorbance?
Enzyme activity is at its maximum value at the optimum pH. As the pH value is increased above or decreased below the optimum pH the enzyme activity decreases.
So, when the medium of study is highly acidic the breaking of the bonds takes place easily. At lower pH values, the absorbance is high because the acid slows down the enzyme activity thereby changing its optimal pH and causes hydrolysis.
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When the temperature of a 3. 0-l sample of a gas is dropped from 200°c to 100°c, what will be the final volume of the gas sample?.
The new volume will be, 6.0 L
[tex]P \propto \frac{1}{V}[/tex]
or,
[tex]P_1 V_1=P_2 V_2[/tex]
where,
[tex]P_1[/tex] = initial pressure = P
[tex]P_2[/tex] = final pressure = 2P
[tex]V_1[/tex] = initial volume = 3.0 L
[tex]V_2[/tex] = final volume = ?
Now put all the given values in the above equation, we get:
[tex]200P \times 3.0 L=100 P \times V_2[/tex]
[tex]V_2=6.0 \mathrm{~L}[/tex]
Thus, the new volume will be, 6 L
What is volume?
Volume is a basic physical amount. Volume is a derived amount and it expresses the three dimensional extent of an item. Volume is usually quantified numerically denote the SI derived unit, the cubic meter.
The new volume will be, 6.0 L
[tex]P \propto \frac{1}{V}[/tex]
or,
[tex]P_1 V_1=P_2 V_2[/tex]
where,
[tex]P_1[/tex] = initial pressure = P
[tex]P_2[/tex] = final pressure = 2P
[tex]V_1[/tex] = initial volume = 3.0 L
[tex]V_2[/tex] = final volume = ?
Now put all the given values in the above equation, we get:
[tex]200P \times 3.0 L=100 P \times V_2[/tex]
[tex]V_2=6.0 \mathrm{~L}[/tex]
Thus, the new volume will be, 6 L
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If equal masses of the following compounds undergo complete combustion, which will yield the greatest mass of CO2?
A) Benzene C6H6
B) Cyclohexane C6H12
C) Glucose C6H12O6
D) Methane CH4
The correct option is D) Methane (CH₄), which will yield the greatest mass of CO₂.
The combustion chemical reaction and stoichiometry for carbon dioxide are presented below for this situations possibilities, assuming a mass of 100 g for each compounds :
Option A. Benzene C₆H₆ :
C₆H₆ + [tex]\frac{15}{2}[/tex]O₂ → 6CO₂ + 3H₂O
Since m(CO₂) = 100gC₆H₆ × [tex]\frac{1 mol C6H6}{78g C6H6}[/tex] ×[tex]\frac{6 mol CO2}{1mol C6H6}[/tex] × [tex]\frac{44g CO2}{1 mol CO2}[/tex]
m(CO₂) = 347.4 g of CO₂
Option B. Cyclohexane C₆H₁₂
C₆H₁₂ + 9O₂ → 6CO₂ + 6H₂O
m(CO₂) = 100gC₆H₁₂ × [tex]\frac{1 mol C6H12}{84 g C6H12}[/tex] × [tex]\frac{6 mol CO2} {1 mol C6H12}[/tex] × [tex]\frac{44g CO2}{1 mol CO2}[/tex]
m(CO₂) = 314.3 g CO₂
Option C. Glucose C₆H₁₂O₆
C₆H₁₂O₆ + 6O₂ → 6CO₂ + 6H₂O
m(CO₂) = 100gC₆H₁₂O₆ × [tex]\frac{1mol C6H12O6}{180g C6H12O6}[/tex] × [tex]\frac{6mol CO2}{1mol C6H12O6}[/tex] × [tex]\frac{44g CO2}{1mol CO2}[/tex]
m(CO₂) = 146.7 g CO₂
Option D. Methane CH₄
CH₄ + 2O₂ → CO₂ + 2H₂O
m(CO₂) = 100gCH₄ × [tex]\frac{1mol CH4}{16g CH4}[/tex] × [tex]\frac{6mol CO2}{1mol CH4}[/tex] × [tex]\frac{44g CO2}{1mol CO2}[/tex]
m(CO₂) = 1650 g CO₂
As a result, D) Methane CH4 produces the greatest mass of carbon dioxide for equal masses.
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If the bond angle between two adjacent hybrid orbitals is 120°, which is the hybridization?.
Three sp₂ hybrid spins that are aligned at a 120-degree angle to one another are produced when a s orbital is hybridized with p+ orbitals (p x and p y). Trigonal geometry is produced by Sp₂ hybridization.
How do you define hybridization?Atomic orbitals with the same energy are blended together in a procedure called hybridization is order to obtain the same quantity of a novel type of hybrid orbitals. This mix typically results in hybrid atomic nuclei with entirely different energies, topologies, etc.
What is sp2 hybridization?One s orbital and two p orbitals combine to generate three sp2 orbitals, each of which has 33% s character and 67% p character. This process is known as sp2 hybridization. Anytime an atom is surround by 3 groups of electrons, this kind of hybridization is necessary.
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how many times more energy comes from the nuclear reaction than the chemical reaction? if you did it right, this answer should be on the order of millions.
The times more energy comes from the nuclear reaction than the chemical reaction is more than 1,000,000 or greater than one million.
The nuclear reaction releases is greater than one million times than the chemical reaction. nuclear reactions are more energetic than the chemical reaction about a millions times. the mass difference in the nuclear reaction is large as compared to the chemical reaction. The nuclear reaction involves the energy level change to the neutrons and the protons. in the chemical reaction the energy level change to the electrons.
Thus, the nuclear reaction produce more energy than the chemical reaction of about greater than a million.
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atmospheric stability and wind conditions control group of answer choices the vertical and horizontal dispersion of pollutants the quantity of pollution emitted into the atmosphere from industrial and mobile sources. the rate of photochemical reactions taking place. the increased use of fuel for heating or cooling
The correct answer is
atmospheric stability and wind conditions control the vertical and horizontal dispersion of pollutants.
What is meant by atmospheric stability?
Atmospheric stability is a measure of atmospheric status which determines whether or not air will rise, sink, or be neutral. In general, stability refers to air tendency to rise or to resist vertical motion.
Three Types of Stability
1. An unstable atmosphere will enhance or encourage the vertical movement of air.
2. A stable atmosphere will suppress or resist vertical motion.
3. A neutral atmosphere will neither suppress nor enhance vertical motion.
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how should you react to questions you are unable to answer in the question-and-answer session of a presentation? group of answer choices simply tell them you don't know. close the question-and-answer session.
When asked a question during the question-and-answer portion of a presentation and you are unable to answer it, just say you don't know.
To recognize your distracting nonverbal habits, rely on your memories of your presentation activities. Accept the inquiry with a good response. Be clear and succinct in your explanation of why you don't know the answer. Affirm that you will look into it for them. Explain how you'll contact them again.
You can gain some breathing room for your ideas by asking the same question again and for clarity. You may occasionally require some time to gather your thoughts before answering to a question. You might be able to buy yourself some extra time to gather your thoughts before responding.
A possible response is, "That's a nice question; can I think about it for a moment and come back to you later?" or "wonderful question I can respond to some of it, but I'd like to give it some thought first." Make appropriate eye contact, take a deep breath, and smile.
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Mg2+Draw the Lewis dot structure for Mg2+. Show the charge. To change the symbol of an atom, double-click on the atom and enter the letter of the new atom.
The Lewis dot structure of Mg²⁺ is shown in the attached image.
Mg atoms have two electrons in their outermost orbitals. An atom has the ability to lose two electrons and he becomes Mg²⁺.
Lewis structure, also called Lewis symbols, are used to represent electrons as dots. Two electrons are donated from the Mg atom to produce a magnesium ion or Mg²⁺.
The electronic configuration of Mg can be written as 1s2 2s2 2p6 3s2, whereas the electronic configuration of Mg²⁺ was found to be 1s2 2s2 2p6. Element number magnesium is 12.
To create a Lewis electron dot diagram, visualize the symbol for magnesium inside a box containing all core electrons. We then place the valence electrons so that each side of the box corresponds to the highest energy level orbital. The Mg²⁺ ion fills the vacancy in the second orbital with eight electrons.
Note here that this ion has a valence shell of 2 and the number of electrons in it is 8. Therefore, the Lewis structure has eight points, and since it is a charged species, the net charge must also be mentioned. Therefore, the Lewis structure of Mg²⁺
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Classify the carbohydrate tagatose by both the carbonyl group and the number of carbon atoms.
ketohexose is the carbohydrate tagatose by both the carbonyl group and the number of carbon atoms.
An atom is a particle to be counted that uniquely defines a chemical detail. An atom consists of a central nucleus which is surrounded with the aid of one or extra negatively charged electrons. The nucleus is definitely charged and incorporates one or greater especially heavy particles known as protons and neutrons.
The time period "atom" comes from the Greek phrase for indivisible as it was as soon the idea that atoms were the smallest matters within the universe and couldn't be divided.
An atom includes a critical nucleus that is surrounded by means of one or more negatively charged electrons. The nucleus is undoubtedly charged and incorporates one or greater extraordinarily heavy particles called protons and neutrons. Atoms are the simple building blocks of the count.
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5.provide an example of each of the following types of reactions: a.neutralization b.acid and metal c.acid and metal oxide
Answer:
Neutralization
strong acid and strong basesstrong acid and weak basesAcid and metal
sulphuric acidnitric acidacid and metal oxide
basic oxidesneutral oxidesas a result of electron flow through complex iii, four protons (h ) are moved into the intermembrane space
The given statement is true.
One QH2 carrying two electrons, transfers one of the electrons to the 2Fe-2S clusters in the Riske proteins (I think? I'm not sure about this protein) which then transfers the one electron to the cytochrome c1 subunit of complex three which transfers a single electron to the mobile cytochrome c in the P side (intermembrane space)
The other electron carried by the QH2 is transferred to Heme bL and then Heme bH in the cytochrome b subunit which then transfers the electron to a Q making it a (dotQ-) a semiquinone radical. The original QH2 has been fully oxidized to Q at this point and released
Second QH2 docks and goes through the same process generating a second molecule of cytochrome c and fully reducing the semiquinone to the QH2.This means, in the overall process 2QH2 were oxidized to produce two cytochrome c but two of the electrons were used to generate 1QH2 so there was only a net of one QH2 to make those two cytochrome c
For each QH2 oxidized, the 2H+ carried by the coenzyme Q were transferred to the intermembrane space, so the Q cycle allows for four H+ to be transferred per net QH2 consumed rather than 2
How much H+ is pumped into the intermembrane space?
As the electrons pass from NADH to ubiquinone, energy is released and utilized by the complex to pump 4 H+ ions into the intermembrane space.
Therefore the given statement is true.
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in which area of the peirodic table are the elements with the strongest nonmetallic properties located
The elements with the strongest nonmetallic properties are located in the upper right side of the periodic table.
A non-metallic chemical element that may create anions, acid oxides, acids, and stable hydrogen compounds. Examples include boron, carbon, and nitrogen. It belongs to group 13 to 17.
Elements with 4, 5, or 7 electrons in their outermost shell are considered non-metals. Non-metals include things like carbon, oxygen, chlorine, etc.
Natural substances known as non-metals are brittle and thermally and electrically inert (can not be easily rolled, moulding, extruding or pressing). The non-metallic elements in the periodic table are hydrogen, carbon, nitrogen, oxygen, phosphorus, arsenic, and selenium.
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_________produces pyruvate. The multienzyme complex Glycolisis
Gluconeogenesis
Glycogenesis
______catalyzes the oxidative pyruvate kinase glyceraldehyde 3-phosphate dehydrogenase acetyl CoA carboxylase pyruvate dehydrogenase
______ of pyruvate to yield carbon dioxide and acetyl CoA. decarboxylation phosphorylation dehydrogenation
The overall equation for the reaction is
pyruvate + CoA + NADH + H+ acetyl CoA + NAD + + CO2 pyruvate + CoA + NAD+ + acetyl CoA + NADH + H+ +CO, pyruvate + COA + NAD+ - acetyl CoA + NADH + H+ pyruvate + COA+NAD acetyl COA+NADH+CO, +e pyruvate + CoA + NAD + CO, acetyl COA + NADH + H+
Acetyl CoA is the main form in which carbon compounds enter the_______
Cori cycle. citric acid cycle. electron-transport chain. Calvin cycle.
The answer is
1. Glycolysis produces pyruvate.
2. Pyruvate dehydrogenase catalyzes the oxidation of pyruvate kinase
3. Decarboxylation of pyruvate to yield carbon dioxide and acetyl CoA.
4. Acetyl CoA is the main form in which carbon compounds enter the
citric acid cycle.
What is Glycolysis?
Glycolysis is the process in which glucose is broken down to produce energy. It produces two molecules of pyruvate, ATP, NADH, and water. The process takes place in the cytoplasm of a cell and does not require oxygen. It occurs in both aerobic and anaerobic organisms.
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the combustion of octane, c8h18,c8h18, proceeds according to the reaction shown. 2c8h18(l) 25o2(g)⟶16co2(g) 18h2o(l) 2c8h18(l) 25o2(g)⟶16co2(g) 18h2o(l) if 442 mol442 mol of octane combusts, what volume of carbon dioxide is produced at 33.0 ∘c33.0 ∘c and 0.995 atm?
The volume of the carbon dioxide is 89323.67 L.
Given,
Moles of octane = 442 moles
The balanced chemical reaction is given as,
2C₈H₁₈ + 25O₂ → 16CO₂ + 18H₂O
2 moles of octane on reaction produces 16 moles of carbon dioxide
1 mole of octane on reaction produces 16/2 moles of carbon dioxide
442 moles of octane on reaction produces 8 × 442 moles of carbon dioxide
Moles of carbon dioxide = 3536 moles
Given:
Pressure = 0.995 atm
Temperature = 33.0 °C
The conversion of T( °C) to T(K) is shown as follows:
T(K) = T( °C) + 273.15
So,
T₁ = (33.0 + 273.15) K = 306.15 K
Using ideal gas equation as:
PV = nRT
where,
P is the pressure
V is the volume
n is the number of moles
T is the temperature
R is Gas constant having value = 0.0821 L.atm/K.mol
Applying the equation as:
0.995 atm × V = 3536 mol × 0.0821 L.atm/K.mol × 306.15 K
⇒V = 89323.67 L
Hence, the volume of the carbon dioxide is 89323.67 L.
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consider equimolar samples of different ideal gases at the same volume and temperature. gas a has a higher molar mass than gas b. compare the pressures. a>b a
The ideal gas equation is PV = nRT, The pressure A =B.
Equimolar quantities of salts are taken for double salts education due to the fact the houses of the character cation or anion does no longer alternate in double salts while dissociates and if salts are not in equimolar then they could get precipitate.
An equimolar buffer is one in which the concentration of the susceptible acid (or base) is the same as the concentration of the conjugate ion.
Quantities in chemistry are commonly expressed as moles; whereas concentrations use the time period molar. A mole of some thing is the molecular weight for the compound expressed as grams.
case I
n= same , T= same , V= same Thus
i) pressures A =B
ii) rmas speed is given by u = (3RT/M)1/2
Thus A with higher molar mass has less rms speed
A< B
iii) average kinetic energy depends only on temperature (Average Kinetic energy = 3/2 RT)
Thus A =B as they are at same temperature
Case II
C and D are at
n= same , M = same , V= same T(C) > T(D)
i) pressures C>D as P is proportional to T
ii) rms speed
C>D as rms velocity is proportional to T
iii) average kinetic energy C >D
Case III
n = same M = same , T = same , V of E >F
i) pressures E<F as P is inversely proprtional to V
ii) rms speed E =F at same temperature
iii) average kinetic energy E =F
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Disclaimer:- your question is incomplete, please see below for the complete question.
consider equimolar samples of different ideal gases at the same volume and temperature. gas a has a higher molar mass than gas b. compare the pressures. a>b a
methane, ch4(g), reacts with steam to give synthesis gas, a mixture of carbon monoxide and hydrogen, which is used as starting material for the synthesis of a number of organic and inorganic compounds. ch4(g) h2o(g) → co(g) h2(g) [unbalanced] what mass of hydrogen is formed if 275 l of methane (measured at stp) is converted to synthesis gas?
methane, ch4(g), reacts with steam to give synthesis gas, a mixture of carbon monoxide and hydrogen, which is used as starting material for the synthesis of a number of organic and inorganic compounds,1 mole of gas will take up 22.4 litres at STP.
Methane gas moles equal 275/22.4 = 12.27 moles.
Equation in balance: CH4 + H2O === CO + 3H2
Type of response: double replacement
Produced moles of H2 gas equal 12.27 x 3 = 36.81 moles. (Because three moles of H2 are produced from one equivalent of CH4)
Hydrogen mass is equal to 36.81 x 2.016, or 74.20 grammes.
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for each pair of compounds, pick the one with the higher boiling point. explain your reasoning. cs2 or cse2
Due to the cancellation of the two opposing dipoles within the molecule, CO2 is a nonpolar molecule. Consequently, the modest dispersion forces are its main intermolecular forces.
What are the forces between molecules?
Intermolecular forces are those that exist between molecules. It differs from an intramolecular force—that is, a force that exists within a molecule—because of this. A force within a molecule would therefore resemble a covalent bond. Intermolecular force is the name for the force that exists between molecules.
What are instances of intermolecular forces?
Intermolecular forces operate between molecules. In contrast, intramolecular pressures are produced by molecules themselves. Intermolecular forces are less powerful than intramolecular forces. Intermolecular forces include the London dispersion force, dipole-dipole interaction, ion-dipole interaction, and van der Waals.
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what is the concentration of the hydroxide ion given that the concentration of the hydronium ion is 1.5 x 10-5 m? group of answer choices 1.0 × 10-14 m 1.5 × 109 m 6.7 × 10-10 m 1.0 × 10-19 m none of the above
The concentration of hydroxide ion is 6.7 × 10⁻¹⁰ M.
Water dissociates and forms an equilibrium reaction to give its ionic products hydronium ion and hydroxide ion. The reaction is given as:
H₂O + H₂O ⇄ H₃O⁺ + OH⁻
The ionic product of water is referred to as Kw, whose value is
Kw = 1 × 10⁻¹⁴ M²
And Kw is equal to the product of the hydroxide ion and hydronium ion concentration.
Kw = [H₃O⁺ ] [OH⁻]
We are given, the hydronium ion concentration is 1.5 × 10⁻⁵ M
So, hydroxide ion concentration can be calculated as:
Kw = [H₃O⁺ ] [OH⁻]
[OH⁻] = Kw/ [H₃O⁺ ]
[OH⁻] = 1 × 10⁻¹⁴ M² / 1.5 × 10⁻⁵ M
[OH⁻] = 6.7 × 10⁻¹⁰ M
Thus, the concentration of hydroxide ion is 6.7 × 10⁻¹⁰ M
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Combustion of a 0.9827-g sample of a compound containing only carbon, hydrogen, and oxygen produced 1.878 g of co2 and 1.153 g of h2o. what is the empirical formula of the compound?
The empirical equation is C4H11O2.
How do you locate empirical formulas?Mass of C=1.900g CO2×12.01 g C/44.01g CO2=0.5185 g C
Mass of H=1.070g H2O×2.016 g H/18.02g H2O=0.1197 g H
Mass of C + Mass of H =0.5185 g + 0.1197 g =0.6382 g
This is less than the mass of the sample.
The missing mass must be caused by O.
Mass of O = 0.9827 g - 0.6382 g = 0.3445 g
Now, we must convert these masses to moles and find their ratios.
we get, The empirical formula is C4H11O2.
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to determine the total amount of gas it took to mow the lawn this past summer, erin multiplied the number of times she mowed the lawn, 24 , by the amount of gas it takes to mow the lawn each time, 3 8 of a gallon. what is the total amount of gas? responses 1 64 of a gallon 1 sixty-fourth of a gallon 1 9 of a gallon 1 ninth of a gallon 9 gallons 9 gallons 64 gallons 64 gallons
Answer: 9 gallons
Explanation:
3/8 = 0.375
0.375x 24 =
9 so answer is 9 gallons
a solution was prepared by mixing 12.49 mg of d plus 10.00 ml of unknown containing just c, and diluting to 25.00 ml. peak areas of 5.97 and 6.38 cm2 were observed for c and d, respectively. find the concentration (mg/ml) of c in the unknown.
The concentration of A is 0.417 mg/ml.
Response factor (F) for compound "A" with response to "B" is
(Area) A / [A] = F x (Area) B / [B]
10.86 / 1.03 = F x 4.37 / 1.16
F = 2.799
Now, unknown solution has 12.49 mg of B
Final conc. of B = 12.49 mg / 25 ml = 0.4996 mg/ml
Let conc. of A = x mg / ml
Final conc. of A = 10ml / 25ml . x mg / ml
=0.4 c mg /ml
Now (Area) A = 5.97, (Area) B = 6.38
5.97 / 0.4 x = 2.799 . 6.38 / 0.4996
x = 0.417 mg/ml
Solution, in chemistry, a homogenous mixture of or more materials in relative amounts that may be varied continuously up to what's referred to as the restrict of solubility. The term solution is typically implemented to the liquid nation of count number, but solutions of gases and solids are feasible.
Let us find out in this text. As a protracted as a liquid is made of a single substance, it remains pure and is known as a liquid. While something is added to it, it will become a solution.
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One periodic trend is Periods represent the number of energy levels in an atom model.
True or False
There are various kind of elements that are present in periodic table. Some elements are harmful, some are radioactive, some are noble gases. Therefore, the given statement is true.
What is periodic table?Periodic table is a table in which we find elements with properties like metals, non metals, metalloids and radioactive element arranges in increasing atomic number.
Periodic table help a scientist to know what are the different types of elements are present in periodic table so that they can discover the new elements that are not being discovered yet.
One periodic trend is Periods represent the number of energy levels in an atom model. The period number represents the valence shell of an element and hence valence shell is the energy level of the element.
Therefore, the given statement is true.
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consider the lewis structure for pcl3 . the lewis structure for pcl3. the central p has a single bond to each cl atom and a lone pair. each cl atom has 6 valence electrons. what are the approximate bond angles?
Considering the lewis structure for PCl₃, PCl₃'s bond angle is 103°.
PCl₃'s bond angle is less than 109°. The chemical formula for phosphorus trichloride is PCl₃, and it is a rare substance.
This indicates that the phosphorus atom is located in the middle of a triangle formed by the three chlorine atoms.
Because the angles of the bonds between each pair of atoms are all 120 degrees, this molecule is known as "triple-chlorine."
Since chlorine needs an electron and phosphorus has a metallic nature and is an easy electron donor, their bond in PCl₃ is covalent. Additionally, it has trigonal bi pyramidal structure, as per VSEPR.
So, the approximate bond angles between P and Cl is 103°.
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