Calculate the ph of 1.0 l of an aqueous solution containing 75 mmol of mes (pka = 6.09) and 25 mmol of its conjugate base.

1.07×10³Hz  frequency become if the person's breathing passage were filled with helium instead of air

Here, air temp is taken as 37.0°C if the person's breathing passage were filled with helium instead of air then we find out velocity of sound in the helium. here velocity of sound in the helium for 0°C is 965m/s

formula for velocity of sound in the helium :

Vw he=Vw at 0°C×√T/273

Whereas Vw he=965×√273+37/273  

Vw he=1028m/s

Here we find frequency so fundamental freq=fundamental harmonic no 1(velocity/4(length of tube)

=1(1028/4×0.24)

f=1.07×10³Hz

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The element involved in the process of petrification, replacement, and  permineralization is silica, were petrification is the combination of 2 types of fossilization, replacement, and permineralization

Permineralization is a way of fossilization in which minerals ( like silica have deposited the fill the empty  pores of shells  or the  hard animal parts). Petrification is a process where the organic material is converted to stone by replacing the original material and the pores with minerals, and Replacement occurs when the original bones or shells dissolve away and is replaced by a different mineral, which occurs along with permineralization, the whole process is called petrification.

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The energy of the carbide released is 7262.5MJ.

We know that the reaction between calcium  oxide and carbon occurs in accordance with the reaction; [tex]CaO(s)+3C(s)----- > CaC_{2} (s)+CO(g)[/tex]. The reaction is seen to produce 464.8kJ of energy per mole of carbide produced.

Number of moles of [tex]CaC_{2}[/tex] produced = 1000 * 10^3 g/64 g/mol

= 15625 moles of calcium carbide

If 1 mole of [tex]CaC_{2}[/tex] transfers  464.8 * 10^3 J

15625 moles of calcium carbide transfers 15625 moles  * 464.8 * 10^3 J/ 1 mol

= 7262.5MJ

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The absolute error that could be expected when measuring the half-life of radon-220 is 0.416 s

The following data were obtained from the question:

We can obtaine the absolute error as illustrated below:

Percentage error = (Absolute error / Actaul measurement) × 100

0.8% = Absolute error / 52

0.008 = Absolute error / 52

Cross multiply

Absolute error = 0.008 ×52

Absolute error = 0.416 s

Thus, the absolute error in measuring the half-life is 0.416 s

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Answer:

Thomson used creativity to interpret the results of the cathode ray tube experiment. Explain how the atomic theory was modified from Dalton's theory to Rutherford's.

There is more traffic between 8 and 9 in the morning because most people start work at 9. this would be a(n) hypothesis.

A hypothesis is a tested assertion about the relationship between two or more variables or a proposed justification for an observed phenomenon in a scientific context. It helps make a connection to the guiding idea and specific study topic.

It supports data processing and evaluates the study's validity and reliability. It provides a base or further proof to back up the study's validity.

A hypothesis can be categorised as being straightforward, complex, or direction-based.

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Answer:

-1.42, -0.375, 32.5% (.325), 3/8 (.375), √4 (2.0), 3 (3.0), 2³ (8.0)

A Polar covalent bond is formed by an unequal sharing of one or more electron pairs.

The bond formed by sharing of an electron pair between two atoms is known as covalent bond.

In a polar covalent bond  the atoms have an unequal attraction for electrons and so the sharing is unequal. Bond between Oxygen and Hydrogen in water molecule is one of the example of polar covalent bond.

In Non-Polar Covalent bond  the atoms have an equal attraction for electrons and so the sharing is equal. Bond between two Hydrogen atoms  in [tex]H_{2}[/tex] molecule is one of the example of non-polar covalent bond.

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The number of atoms in 259 g of C₁₂H₂₁O₉ is 45 x 10²³ oxygen.

The molar mass of many compounds can be calculated by dividing the mass of the compound by the number of moles of the compound.

Given the molar mass is 309.29 g/mol

Given weight= 259g

number of moles = mass / molar mass

259g / 309.29g/mol =0.837mol

1 mol contains 6.022 x 10²³ molecules

0.837 mol contain 6.022 x 1023 x 0.837 = 5.0 x 10²³ molecules

1 molecule of C₁₂H₂₁O₉ contains 9 oxygen atoms

5.0 x 10²³ molecules of C₁₂H₂₁O₉ contain 9x 5 x 10²³ oxygen atoms.

=45 x 10²³ oxygen atoms

Thus, the number of atoms in 259 g of C₁₂H₂₁O₉ is 45 x 10²³ oxygen atoms

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Answer:

Explanation: your the best

The answer to this question is

0.0037 ml is the measurement which has only non-significant figures.

The basic rules of significant figures are:

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To ensure that the 9-Fluorenone was totally dry, it had to be washed with methylene chloride. To make sure that methylene chloride is present in a pure solution, sodium sulfate binds to water and precipitates.

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The volume measurements won't be accurate and will be either less than or more than the anticipated figure if the graduated cylinder is accurately calibrated (depending on if the error in calibration is higher or lower). Depending on the calibration error, the calculated value may be higher or lower than the real value.

What is calibration?

Setting up an instrument so that it can generate findings for samples that fall within a tolerable range is part of the calibration process. A key component of instrumentation design is eliminating or reducing conditions that lead to faulty measurements.

Calibration attempts to reduce any measurement uncertainty by confirming the precision of test apparatus. In measuring procedures, calibration quantifies and reduces mistakes or uncertainties to a manageable level.

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Answer: 17.5 cm

Explanation:

10 mm=1 cm

175mm * 1 cm/10 mm=

175/10 cm=17.5 cm

Answer:

7.6410^-14 grams N2O4

Explanation:

I will assume that "contains a billion (1.00 × 10º)" is meant to read "(contains a billion (1.00 × 10^9)."

One mole of anything contain 6.02x10^23 particles of that thing (atoms, molecules, paper clips, suns, etc.).  If there are 1.00x10^9 particles of N2O4, we have:

(1.00x10^9 particles N)/(6.02x10^23 particles/mole) = 1.66x10^-15 mole of N atoms

Each mole of N2O4 contains 2 moles of N atoms:  

(1 mole N2O4)/(2 moles N atoms)

(1.66x10^-15 mole of N atoms)*(1 mole N2O4)/(2 moles N atoms) =

8.31x10^-16 moles N2O4

The molar mass of N2O4 is 92.01 g/mole.

(8.31x10^-16 moles N2O4)*(92.01 g/mole) = 7.6410^-14 grams N2O4

Taking into account the definition of density, the volume of cyclohexane should be 23.13 mL.

Density is defined as the property that matter, whether solid, liquid or gas, has to compress into a given space and allows us to measure the amount of mass in a certain volume of a substance.

The expression for the calculation of density is:

density= mass÷ volume

In this case, you know that:

Replacing in the definition of density:

0.7781 g/mL= 18 g÷ volume

Solving:

0.7781 g/mL ×volume= 18 g

volume= 18 g÷ 0.7781 g/mL

volume= 23.13 mL

In summary, the volume of cyclohexane should be 23.13 mL.

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Peptide bonds, hydrogen bonds, disulfide linkages, van der Waals, and electrostatic forces of attraction are the chemical bonds that stabilize the different structures in primary, secondary, tertiary, and quaternary structures.

The advanced structure of proteins gives rise to two kinds of major molecular shapes which are fibrous as well as globular structures. The main forces which are involved in stabilizing the secondary along with the tertiary structures of proteins include hydrogen bonds, disulfide type linkages, van der Waals attraction, and electrostatic forces of attraction.

The primary structure is generally determined by adjoining peptide bonds where the link is adjoining amino acids in sequential order. Tertiary structure is determined by the existence of disulfide bonds in between hydrophobic interactions as well as cysteine residues whereas the quaternary type structure is determined by multiple subunits of a protein that undergo various interactions.

Hydrogen bonds exist in a protein molecule as its large number can form between adjacent regions of the polypeptide chain in folded form and stabilize its three-dimensional kind of shape.

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Taking into account the reaction stoichiometry, the mass of ammonia formed is 34 grams.

In first place, the balanced reaction is:

N₂ + 3 H₂ → 2 NH₃

By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:

The molar mass of the compounds is:

Then, by reaction stoichiometry, the following mass quantities of each compound participate in the reaction:

In this case, by reaction stoichiometry, a 28.0 g sample of nitrogen gas combines completely with 6.0 g of hydrogen gas. So, the mass of ammonia formed is 34 grams.

In summary, by reaction stoichiometry, the mass of ammonia formed is 34 grams.

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During the breakdown of fatty acids, not all acetyl CoA enters the citric acid cycle, and your body converts some acetyl CoA to ketone bodies.

Acids are molecules or ions that can donate protons, known as Bronsted-Lowry acids, or form covalent bonds with electron pairs, known as Lewis acids. The first category of acids is proton donors or Brønsted-Lowry acids.

Blood is normally slightly alkaline, with a normal pH range of about 7.35 to 7.45. Normally, the body keeps blood pH near 7.40. Doctors measure a person's acid-base balance by measuring the pH of the blood and the levels of carbon dioxide (acid) and bicarbonate (base). No oil is either an acid or a base. Neutral. Oil is a neutral, nonpolar chemical. That is, it is a viscous liquid at room temperature. It is immiscible with water, but soluble in alcohol and ether.

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A 2. 50 x 10-3 kg sample of oxygen gas at 31. 0 °c has an average molecular velocity of 487 m/s then ke of the gas is 5,929.225 J

Here we have to find kinetic energy of gas and sample is given as 2. 50 x 10-3 kg and velocity of 487 m/s so, formula to find kinetic energy is:

KE=1/2mv²

KE=1/2×2. 50 x 10⁻³×(487)²

KE=5,929.225kgm²/s²

Here 1 joule = 1 kgm²/s² so

1×5,929.225=5,929.225 J

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A reasonable synthetic strategy for the synthesis of 4-methyl-1,4-pentanediol from methyl-4-hydroxybutanoate hoch2ch2ch2cooch3 and the reaction is Grignard reagent

Here in the Grignard reagent reaction chemical compound with the generic formula R-Mg-X where X is halogen  and R is organic group and grignard reaction is the organometallic chemical reaction in which alkyl, allyl, or magnesium halide in the synthesis of that compound 4-methyl-1,4-pentanediol from methyl-4-hydroxybutanoate hoch2ch2ch2cooch3

Synthetic strategy for the synthesis of 4-methyl-1,4-pentanediol from methyl-4-hydroxybutanoate reaction are followed:

Answer:

It will cost $35.5602

Explanation:

$2.459 /6.5 (mpg) = 0.3783 (cents per mile)

$0.3783 (cost per mile) * 94 (total miles) = $35.5602 total

There are 94,608,000 seconds using conversion factor in 3 years.

First, let's calculate the number of seconds in 1 year, and then multiply it by 3 to get the total number of seconds in 3 years.

Conversion factors:

1 year = 365 days

1 day = 24 hours

1 hour = 60 minutes

1 minute = 60 seconds

Step 1: Calculate the number of seconds in 1 year.

[tex]\[\text{1 year} = 365 \text{ days} \times \left(24 \text{ hours/1 day}\right) \times \left(60 \text{ minutes/1 hour}\right) \times \left(60 \text{ seconds/1 minute}\right)[/tex]

Step 2: Calculate the number of seconds in 3 years.

[tex]\[\text{3 years} = 3 \times \left(365 \text{ days} \times \left(24 \text{ hours/1 day}\right) \times \left(60 \text{ minutes/1 hour}\right) \times \left(60 \text{ seconds/1 minute}\right)\right)\][/tex]

Now, let's perform the calculations:

1 year = 365 * 24 * 60 * 60 seconds

          = 31,536,000 seconds

3 years = 3 *31,536,000

            = 94,608,000 seconds

So, there are 94,608,000 seconds in 3 years.

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According to Bohr's model, electron emit electromagnetic radiation when  an electron moves from the higher energy orbit to the lower energy orbit of an atom.

Niels Bohr (1885–1962) proposed a model for the hydrogen atom that explained its atomic emission spectrum.

According to the Bohr model of the atom:

1. Energy levels of electrons are discrete (certain discrete values of energy), that is why hydrogen shows discrete, bright, colored lines.

2. Electrons orbit the nucleus in orbits that have a set size and energy.

3. Electrons can jump from one energy level to another, absorbing or emitting electromagnetic radiation with a frequency ν (energy difference of the levels).

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Answer:

They are called inert gases because they are stable and non-reactive. They have a full outer shell of valence electrons which gives them little tendency to participate in chemical reactions.

Explanation:

They are also know as the "noble" gases.

Your general impression suggests that your immediate action should be to call for additional help. The correct option is a.

Immediate actions are the actions that are taken without taking any time. These actions are taken when there is no time to think, and you should immediately think about the actions. The emergency condition needs immediate help.

During the time of general impression, one should immediately call for additional help. Additional people will give you suggestions for the problem.

Thus, the correct option is a. call for additional help.

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A soluble impurity usually has two effects on the melting point of a compound: an increase in melting point range and a decrease in melting point.

In chemistry, there are two types of impurities: soluble and insoluble.

Soluble impurities are those that dissolve in water quickly and also have a significant impact on the chemical properties of a compound such as a significant increase or decrease in the melting point and boiling point.

For example, salt, milk, and sugar compounds are soluble impurities.

Similarly, insoluble impurities remain undissolved when mixed in water and are also known as suspended impurities.

Examples of insoluble impurities are sand, oil, chalk, rocks, pebbles, etc.

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The change in the internal energy of the gas is 1.5×10∧3 J.

The internal energy of an ideal gas is directly proportional to the temperature of the gas:

ΔE = 3/2 × n × R × ΔT

ΔT = 320 K - 260 K

ΔT = 60 K; change of the temperature

n = 2.0 mol: amount of a monatomic ideal gas

R = 8.1 J/mol×K;the ideal gas constant

ΔE = 3/2 × 2 mol × 8.1 J/mol×K × 60 K

ΔE = 1500 J

ΔE = 1.5×10∧3 J;  the internal energy of the gas

Isobaric process is a type of process in which the pressure of the system stays constant.

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A molecule has an empirical formula of ch, and its molar mass is known to be 26 g/mol and the  molecular formula is C₂H₂ ethyne

Molecular formula of compound is (CH)n and the given molar mass is 26g/mol

Molar mass of (CH)n, C=12=n(12+1)=13n

So 13n and n=2

=13×2=26 and given molar mass is also 26g/mol

So here two carbon and two hydrogen so molecular formula is C₂H₂ and name is ethyne

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The Tricyglycerol yields more energy on oxidation is the one containing three residues of stearic acid because it get fully reduced.

when atom or ion loses the electron in the process called as oxidation or the loss of hydrogen is called as oxidation. when the atom or ion gain electron  in the process called as reduction or gain of hydrogen is called as reduction

when the oxidation takes place  the oxidation state of atom increases and when reduction takes place the oxidation state of species decreases.

when molecule is oxidized, it loses energy and when molecule is reduced , it gains energy

Thus ,we can say that,The triacyglycerol cotaining the three stearic acid residues yield more energy because it is fully reduced.

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The reaction best illustrates the behavior of the weak base h₂po₄- in an solution is:H₂PO₄ (aq) + H₂O (l) ↔ H₃PO₄ (aq) + OH- (aq)

What is a weak base?

A weak base is a base that, upon dissolution in water, doesn't dissociate completely, therefore the resulting aqueous solution contains only a small proportion of hydroxide ions and the concerned basic radical and a large proportion of undissociated molecules of the base.

Contents 1 pH, Kb, and Kw 2 Percentage protonated 3 A typical pH problem.

Examples of Weak Bases.

Ammonia (NH₃) Ammonia could also be a chemical compound with the formula NH ₃. it is a weak base which exists as a colour less gas under standard conditions for ...

2 Trimethylamine (N (CH₃) ₃)₃ Pyridine

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The resulting temperature change is: 40 degrees c

Here given heat added to system 40kcl

Weight of water 1kg we know the specific heat of water is

S= 4.2 J/g \degree c=1 cal/g\degree c

Q=40kcal  m=1.0 kg=4000 g

We have the heat transfer equation given by

Q= ms\Delta t   where Q=heat energy   m=mass

\Delta t=change in temperature

Put the values and we'll have a change in temperature

\Delta t= [tex]\frac{Q}{ms}[/tex]

\Delta t= 40 degree C

Temperature is a numerical expression of how hot a substance or radiation is.

There are three different types of temperature scales: those that are defined by the average translational kinetic energy per freely moving microscopic particle, like an atom, molecule, or electron, in a body, like the SI scale; those that rely only on macroscopic properties and thermodynamic principles, like Kelvin's original definition; and those that are not defined by theoretical principles but rather by useful empirical properties of particulate matter.

A thermometer is used to determine temperature. It is calibrated using different temperature scales that historically defined themselves using different reference points and thermometric substances.

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