Which of the following statements is not true? a. lonic compounds typically have higher melting points than molecular compounds b. Covalent bonds form between non-metal and metal elements
c. Molecular compounds share electrons to form bonds between atoms d. Ionic bonds in the melted state can conduct electricity

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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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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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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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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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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Fractional bond orders are frequently produced by partial bonding, such as when it's a component of a resonance hybrid.

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.

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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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.

From the bleach, we can calculate the mass of sodium hypochlorite.

Then we can calculate the number of moles of sodium hypochlorite.

The molarity for NaOCl

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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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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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Answer: 9 gallons

Explanation:

3/8 = 0.375

0.375x 24 =

9 so answer is 9 gallons

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

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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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.

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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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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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.

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.

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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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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a.they are unstable and highly reactive molecules. sometimes a particle of radiation penetrates a substance and continues on its way, and sometimes it doesn’t. for the particles that don’t make it through a substance.

The definition of radiation is energy that emanates from a source and moves at the speed of light through space. This energy has wave-like characteristics and is surrounded by an electric and magnetic field. Electromagnetic waves are another name for radiation. Our cells' DNA can be harmed by radiation. High radiation doses can result in cutaneous radiation injuries (CRI) or acute radiation syndrome (ARS). Cancer later in life may also result from high radiation doses. Radiation is the emission or transmission of energy as waves or particles through a material medium or through space.

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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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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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Answer:

Neutralization

Acid and metal

acid and metal oxide

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...

The height of column of ethylene glycol supported by atmospheric pressure is 63.33m.

Given -

P= 760 mm Hg

p=1.2g/ml

Principle-

Calculations-

h=760/1.2 x 10

h=760/12

=63.33 m

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It would increase the rate by four times.

The charge of a chemical response is described because the exchange within the concentration of a reactant or a product over the alternate in time, and attention is in moles per liter, or molar, and time is in seconds. So we express the fee of a chemical reaction in molar according to second.

Reactant concentration, the bodily nation of the reactants, and surface area, temperature, and the presence of a catalyst are the 4 principal elements that affect response charge.

There are four factors that affect the price (pace) of a chemical response: temperature, concentration, particle length, use of a catalyst.

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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 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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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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The empirical equation is C4H11O2.

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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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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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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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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