What is the usable free energy (per mol) for transduction when NADH oxidizes and 1/2 O2 reduces? Note the following standard reduction potentials NAD+ + H+ + 2 e- → NADH E' =-0.32 V ½o2 + 2H+ + 2 e- → H2O E'= +0.82 V Choose one: A. -55.0 kJ/mol of NADH oxidized B. -110 kJ/mol of NADH oxidized C. -440 kJ/mol of NADH oxidized D. -220 kJ/mol of NADH oxidized

Answer:

C. Burning oil

Explanation:

Water cannot be used as a fire extinguisher to extinguish the flames of burning oils such as gasoline, petrol, or diesel. Because oil is lighter than water, it floats on top of it and cremates. Furthermore, as the water spreads and carries the oil with it, the fire spreads over a larger area.

I am joyous to assist you at any time.

Answer:

Burning oil

Explanation:

a) To calculate the pH of distilled water, we can use the formula: pH = -log[H+].

Given that the [H+] concentration of distilled water is 10^-10 H mol/L, we can substitute this value into the equation:

pH = -log(10^-10) = 10

Therefore, the pH of distilled water is 10.

b) Tap water with a pH between 6.3 and 6.6 is less acidic than distilled water. The pH scale is logarithmic, meaning that each unit change represents a tenfold difference in acidity or alkalinity. Distilled water with a pH of 10 has a higher concentration of hydroxide ions (OH-) compared to hydrogen ions (H+), indicating it is basic or alkaline.

Tap water with a pH range of 6.3 to 6.6 indicates a higher concentration of hydrogen ions (H+), making it slightly acidic. Although both distilled water and tap water have a pH below 7, tap water is closer to neutral (pH 7) and thus less acidic than distilled water.

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Answer:

Option C is true to be honest

Answer:

i put c and got it wrong its b

Explanation:

According to the stoichiometry of the given chemical equation, the mass of solid product formed that is CuO  is 28.97 g.

It is the determination of proportions of elements or compounds in a chemical reaction. The related relations are based on law of conservation of mass and law of combining weights and volumes.

Stoichiometry is used in quantitative analysis for measuring concentrations of substances present in the sample.

123.55 g copper carbonate gives 79.54 g copper oxide thus, 45 g copper carbonate will give 45×79.54/123.55=28.97 g.

Thus,  the mass of solid product formed that is CuO  is 28.97 g.

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Lithium reacts with one atom of fluorine, and the atomic mass of fluorine is 38 amu.

The atomic mass of an element is the average mass of the atoms of an element measured in atomic mass unit.

One lithium (Li) atom can combine with one fluorine (F) atom. Together, they make the formula LiF.

Fluorine has seven electrons of it's own. Lithium gives up its one electron to make both atoms happy.

Hence, lithium reacts with one atom of fluorine, and the atomic mass of fluorine is 38 amu.

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Mass of H₂O produced = 7.488 g

Given

40.8 g of C₆H₆O₃

42.8% yield

Required

mass of H₂O

Solution

Reaction

C₆H₆O₃+6O₂=>6CO₂+3H₂O

mol of C₆H₆O₃(MW = 126 g/mol) :

= mass : MW

= 40.8 g : 126 g/mol

= 0.324

Mol H₂O :

= 3/1 x mol C₆H₆O₃

= 3/1 x 0.324

= 0.972

Mass H₂O(theoretical) :

= 0.972 x 18 g/mol

= 17.496 g

%yield = (actual/theoretical) x 100%

0.428 = actual / 17.496

actual = 7.488 g

Answer:

the aNSWRER TOP UR QUESTION IS THAT I NMEED TO ANSWER THIS SO I DONT HAVE TO WQATCH ADS  LOL

Explanation:

DSADSDASDASDASDSDSDSDSDS and i knowq chem is bio chwem is

Answer:

Explanation:

The volume of a substance when given the density and mass can be found by using the formula

\(volume = \frac{mass}{density} \\ \)

From the question

mass of aluminum = 8.1 g

density = 2.7 g/mL

It's volume is

\(volume = \frac{8.1}{2.7} \\ \)

We have the final answer as

Hope this helps you

A base, according to the Arrhenius definition, is any species that increases the concentration of OH- in the solution. Some examples of bases are, NaOH, KOH, LiOH, all these substances will increase the concentration of OH when dissolved. Letter C

When a nonmetal bonds with a nonmetal, electrons are shared between the two atoms, which creates a covalent bond. This type of bond involves the sharing of electrons between atoms to create a stable molecule. Therefore, the correct answer to the question is that a covalent bond is involved and a molecular compound forms.

Covalent bond is formed by sharing of electrons between two non metals to complete their octet. The covalent bond is formed between two non metals which have similar electronegativity.

While ionic bond is formed by gain or lose of electrons between metal and non metal and complete their octet.It is formed between two ions in which one is positive due to lose of electrons and other non metal is negative ion  due to gain of electron.

Ionic bond is formed by lose or gain of electrons therefore, it is stronger than covalent bond.

Example of ionic bond is NaCl

Example of covalent bond is

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It is given that its a combustion reaction, we know that the ending compounds are CO2 and H2O alone.  To get this, we add O2 in a combustion reaction to our initial compound.

C8H18 + O2  --->  CO2 + H2O  ( + trace amounts of C8H18 left)  We are asked about the C8H18 left meaning we have a limiting reactant and it is not completely water and CO2 left due to the limiting reagent.  So we are trying to find the excess reactant.  

To balance the equation we must balance all molecules ;

2 C8H18 + 25 O2  --->  16 CO2  +  18 H2O   (not taking into account the combustion of air)

It is given that it is incomplete combustion so we must use the grams of product to calculate the amount of reactant used due to the limiting reagent

1.15 g H2O * ( 1 mol H2O / 18.01532 g H2O)  *( 2 mol C8H18 / 18 mol H2O) * ( 1 mol C8H18 / 114.24 g C8H18) = 0.00111755 = 0.00118 g C8H18  reacted

11.8 g C8H18 in the initial reaction,  0.0118 g reacted to get 1.15 g H2O

11.8-0.00118 = 11.79882 = 11.8 g C8H18 left in the balanced equation (meaning almost none of it was reacted)

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Answer:

3

Explanation:

Answer:

I actually have no idea

Explanation:

Sorry my man

Answer:

Explanation:

generator

Answer:

The three compounds are different compounds

Explanation:

The mass of Nitrogen that combines with 1 gram of Oxygen in  Compound A = 1.750 g

The mass of Nitrogen that combines with 1 gram of Oxygen in  Compound B  = 0.8750 g

The mass of Nitrogen that combines with 1 gram of Oxygen in  Compound C  = 0.4375 g

According to the law of multiple proportions, when atoms of two different elements react to form compounds, the masses of one of the elements that combines with a fixed mass of the other element are in small whole number ratios.

The ratio of the masses are;

Mass of Nitrogen in Compound B/(Mass of Nitrogen in Compound C =  0.8750/0.4375 = 2

Mass of Nitrogen in Compound A/(Mass of Nitrogen in Compound C =  1.750/0.4375= 4

Mass of Nitrogen in Compound A/(Mass of Nitrogen in Compound B =  1.750/0.8750= 2

Given that the masses of Nitrogen in the three compounds are in small whole number ratios, the three compounds, Compound A, Compound B, and Compound C are different compounds.

In nature, the structure of an object is often related to its function or properties because the shape of an object can affect how it interacts with other objects or substances.

This is true for molecules as well, where the arrangement of atoms and bonds can impact the molecule's chemical and physical properties.

For example, the shape of proteins is crucial to their function in biological systems. The three-dimensional structure of a protein determines its ability to interact with other molecules in the body, such as enzymes, hormones, or receptors. Even small changes in the protein's shape can have significant effects on its function, leading to diseases or disorders.

In summary, the shape of an object can have a significant impact on its function or properties, and this is true for molecules as well. Understanding the relationship between molecular shape and function is essential for many fields, including biochemistry, pharmacology, and materials science.

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The number of moles of hydrochloric acid that we need is 0.135 moles.

Now, we know that stoichiometry is the way that we are able to obtain the products of a reaction from the reactants. This helps us also to perform all the calculations that involve the reaction. In this case, we can see that the balanced reaction equation have been shown in the question and we are expected to use this question to show how we can be able to obtain 45mL of hydrogen gas from a reaction of solid magnesium and and 3.0M HCl.

We have that;

Volume of the system = 45mL

We now need to get the number of the moles of the HCl that we need for the reaction.

Thus, we have

Concentration =  3.0M

Volume =  45mL  or 0.045 L

Number of moles = Concentration * Volume = 3.0M * 0.045 L

= 0.135 moles

The number of moles of hydrochloric acid that we need is 0.135 moles.

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Answer:

2.11x10²⁴ atoms

Answer:

6.022 x 10²³

Explanation:

602,200,000,000,000,000,000,000

start counting spots from right to left till you get 6.022

you counted 23 spots and that's the power of 10

finally 6.022 x10²³

Avogadro's number is the number of units in one mole of any given substance.

Answer:

the sand dune would become flattened and eventually turn into sedementary rock

Answer:

Yeah chemical change occurs when you fry an egg since the whites harden and change shape in a way. Mass is conserved since it doesn't change.

Answer:

i beleive iron

Explanation:

Explanation:

They have a directly proportional relationship.

i.e.

when one of them varies in magnitude, the others will also vary directly.

Quantities expressed as products of each other are always inversely proportional & those expressed as quotients are directly proportional with each other.

KE = 1/2mv^2

Thus, we know that m & v in KE are inversely related.

Inverse proportionality - when m increases, v decreases. & vice versa.

Direct proportionality - when v increases KE also increases

If Temperature increases then the probability of atoms to randomly collide with each other increases rapidly.

the rapidity of these atoms result from the increase in speed(v). since v & KE have a direct r/n ship, KE also increases. as a result the atoms get a relatively high freedom of movement compared to that of those in solids.

London dispersion forces and dipole-dipole interaction are present in the first three compounds, as they are polar. Since tetrafluoromethane is nonpolar, only the London dispersion force exists in it.

Acting between molecules are intermolecular forces. Intramolecular forces, on the other hand, operate within molecules. The forces between molecules are less than those inside them. Van der Waals forces, ion-dipole interactions, the London dispersion force, and dipole-dipole interactions are a few examples of intermolecular forces.

Intermolecular force is the attraction between two atoms or molecules that causes them to join together to form molecules or other substance. In essence, it has a beautiful nature. It also affects atoms and ions.

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The chemical formula for aluminum oxide based on ionic bonding from valence electrons is Al₂O₃.

The chemical formula of a compound is a symbolic representation of its chemical composition.

Chemical formulae gives information about the elements that constitute the molecules of a compound and also about the ratio in which the atoms of these elements combine to form such molecules.

In this compound, aluminum (Al) donates three electrons to oxygen (O), resulting in the formation of Al³⁺ cations and O²⁻ anions. The ionic bond is formed between these oppositely charged ions, resulting in the formula Al₂O₃.

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Answer: A.En Hedu'Anna

Answer:

En Hedu’Anna!

Explanation:

The pH of the base solution after adding the \(HNO_3\) solution is approximately 2.14.

To calculate the pH of the base solution after adding the \(HNO_3\) solution, we need to consider the acid-base reaction between methylamine (\(CH_3NH_2\)) and nitric acid (\(HNO_3\)). Methylamine acts as a base, while nitric acid is an acid. The reaction can be represented as follows:

\(CH_3NH_2 + HNO_3 \rightarrow CH_3NH_3^+ + NO_3^-\)

Since methylamine is a weak base, we need to consider its reaction with water as well:

\(CH_3NH_2 + HNO_3 \rightarrow CH_3NH_3^+ + NO_3^-\)

To solve this problem, we'll use the Henderson-Hasselbalch equation, which relates the pH of a solution to the pKa and the ratio of the conjugate acid and base forms. The pKa of methylamine is given as 3.36.

1. Calculate the initial moles of methylamine in the base solution:

Initial moles of methylamine = volume of solution (L) * molarity of methylamine (mol/L)

Initial moles of methylamine = 0.1323 L * 0.7100 mol/L

Initial moles of methylamine = 0.093963 mol

2. Calculate the moles of nitric acid added to the solution:

Moles of nitric acid = volume of solution (L) * molarity of nitric acid (mol/L)

Moles of nitric acid = 0.1114 L * 0.7500 mol/L

Moles of nitric acid = 0.08355 mol

3. Calculate the moles of methylamine remaining after the reaction:

Moles of methylamine remaining = Initial moles of methylamine - Moles of nitric acid added

Moles of methylamine remaining = 0.093963 mol - 0.08355 mol

Moles of methylamine remaining = 0.010413 mol

4. Calculate the concentration of the conjugate acid (\(CH_3NH_3^+\)) formed:

The concentration of \(CH_3NH_3^+\) = moles of methylamine remaining / volume of solution (L)

Concentration of \(CH_3NH_3^+\) = 0.010413 mol / (0.1323 L + 0.1114 L)

The concentration of \(CH_3NH_3^+\) = 0.010413 mol / 0.2437 L

Concentration of \(CH_3NH_3^+\) = 0.0427 M

5. Use the Henderson-Hasselbalch equation to calculate the pH of the base solution:

pH = pKa + log10 ([concentration of \(CH_3NH_3^+\)] / [concentration of \(CH_3NH_2\)])

Since the pKa of methylamine is given as 3.36:

pH = 3.36 + log10 (0.0427 M / 0.7100 M)

pH = 3.36 + log10 (0.0601)

pH = 3.36 + (-1.22)

pH = 2.14

Therefore, the pH of the base solution after adding the \(HNO_3\) solution is approximately 2.14.

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Answer:

+6

+6

+6

+6

+6

+6answer given

thanks