Find the Protons, Electrons and Neutrons for an atom with the atomic number of 56 and mass number 137

Answer and Explanation:

The buffer solution is composed by sodium acetate (CH₃COONa) and acetic acid (CH₃COOH). Thus, CH₃COOH is the weak acid and CH₃COO⁻ is the conjugate base, derived from the salt CH₃COONa.

If we add a strong base, such as barium hydroxide, Ba(OH)₂, the base will dissociate completely to give OH⁻ ions, as follows:

Ba(OH)₂ ⇒ Ba²⁺ + 2 OH⁻

The OH⁻ ions will react with the acid (CH₃COOH) to form the conjugate base CH₃COO⁻.

Initial number of moles of CH₃COOH = 0.40 mol/L x 1 L = 0.40 mol

Initial number of moles of CHCOO⁻= 0.31 mol/L x 1 L = 0.31 mol

moles of OH- added: 2 OH-/mol x 0.100 mol/L x 1 L = 0.200 OH-

According to this, the following are the answers to the sentences:

a. The number of moles of CH₃COOH will remain the same ⇒ FALSE

The number of moles of CH₃COOH will decrease, because they will react with OH⁻ ions

b. The number of moles of CH₃COO⁻ will increase ⇒ TRUE

Moles of CH₃COO⁻ will be formed from the reaction of the acid (CH₃COOH) with the base (OH⁻ ions)

c. The equilibrium concentration of H₃O⁺ will decrease ⇒ FALSE

The equilibrium concentration of OH⁻ is increased

d. The pH will decrease⇒ FALSE

pKa for acetic acid is 4.75. We add the moles of base to the acid concentration and we remove the same number of moles from the conjugate base in the Henderson-Hasselbach equation to calculate pH:

\(pH= pKa + log \frac{[conjugate base + base]}{[acid - base]}\)

pH = 4.75 + log (0.31 mol + 0.20 mol)/(0.40 mol - 0.20 mol) = 5.15

Thus, the pH will increase.

After the water is delivered, stop the flask to stop the water from evaporating before the mass of the water can be calculated. To the nearest 0.1 mg, weigh the 25 mL of water in the stoppered flask. A minimum of three repetitions should be used to calibrate. Calibration should be done independently by each lab partner.

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Answer:

2 because it has two outer shell electrons out of 8 (relevant rule only for the first 20 elements)

The mass, in grams of 1.16 mole of water, H₂O is 20.88 g

The mole of a substance is related to it's mass and molar mass according to the following equation

Mole = mass / molar mass

With the above formula, we can obtain the mass of H₂O

From the question given above, the following data were obtained:

The mass of 1.16 mole of water can be obtained as illustrated below:

Mole = mass / molar mass

Cross multiply

Mass = mole × molar mass

Mass of H₂O = 1.16 × 18

Mass of H₂O = 20.88 g

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Answer:

Mitosis meiosis

Explain:

Mitosis is where the cell splits into 2 more cells (diploid)

Meiosis is where the cell splits into 2, and then split again, making 4 (haploid)

- Petroleum fraction consisting mostly of \(C_{7}\) and \(C_{8}\) hydrocarbons

- The fraction is also called heavy naphtha

- Boiling in the range 90‒140 °C

- Ligroin is used as a laboratory solvent

- Ligroin it also esed as a motor fuel or as a solvent for fats and oils in dry cleaning

         [] All of these are different characteristics of ligroin​

         [] If you need more let me know  

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Answer:

b.homogeneous

Can I have a Brainliest please?

Explanation:

An average brightness was calculated for each length of graphite tested to get a better understanding of the relationship between the length of the graphite and the brightness of the line it produced.

Graphite has many uses in various industries. Some of its uses include: Pencils, Lubricants, Refractories, Batteries, Electrodes, Nuclear reactors, Aerospace industry.

By calculating the average, it is possible to see if there is a trend in the data and if longer or shorter lengths of graphite produce brighter or duller lines. This information can be useful in determining the best length of graphite to use for a particular task or project.

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Answer:

do you have a picture of the choices?

An aqueous magnesium chloride solution is made by dissolving 7.40 moles of MgCl₂ in sufficient water so that the final volume of the solution is 4.80 L. the molarity of the MgCl₂ solution is equal to 1.54 M.

Molarity is a unit of concentration, which measures the number of moles of a solute per liter of a solution. To calculate molarity, one divides the amount of solute (in moles) by the total volume of the solution (in liters). In chemistry, molarity is often used to measure concentrations of acids, bases, and other solutes in solutions. This unit of concentration is important in lab work, as it allows scientists and researchers to accurately measure and predict the behavior of solutions.

Molarity (M) = /\(\frac{moles of solute}{liters of solution }\)

Molarity (M) =  \(\frac{7.4mol}{4.8L}\)

Molarity (M) = 1.54 M

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Answer:

In 5 US liquid gallons, there are 80 cups.

Explanation:

To get from gallons to cups, just multiply the amount of gallons you have by 16.

In this question we can use the ideal gas law equation, which is:

PV = nRT

Where:

P = pressure

V = volume in Liters, 150.2 L

n = number of moles, 3 moles

R = the constant for gases, 0.082 L atm/mol K

T = temperature in kelvin, 318 K

Now we only need to use these values in the equation

P * 150.2 = 3 * 0.082 * 318

150.2P = 78.23

P = 0.52, but this answer is in atm, so 0.52 atm

Now we need to transform atm to mmHg, which is 1 atm = 760 mmHg

1 = 760

0.52 = x mmHg

x = 395.2 mmHg of pressure

The velocity of the water with an earlier velocity of 8 m/s will be 24 m/s in the small tube with an area of 4 cm², option C.

This is a problem involving the conservation of mass and the principle of continuity in fluid mechanics. According to the principle of continuity, the mass of a fluid flowing through any given section of a pipe must remain constant.

Using the given equation A₁v₁ = A₂v₂

A₁v₁ = A₂v₂

(12 cm²) (8 m/s) = (4 cm²) (v₂)

v₂ = (12 cm²) (8 m/s) / (4 cm²)

v₂ = 24 m/s.

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Clofibrate is a lipid-lowering pharmaceutical that has been utilized to treat hyperlipidemia. Its metabolism system includes different pathways such as hydrolysis, oxidation, conjugation, and others.

Metabolites are little molecules that are produced during the process of  metabolism in living living beings.

Clofibrate hydrolysis metabolite:

Clofibrate oxidation metabolites:

Clofibrate alkylation metabolites:

Clofibrate conjugation metabolites:

Conclusively, the relative abundance and significance of each metabolite can vary among individuals.

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Answer:

Below

Explanation:

a)  From the equation every 2 moles of (CuNo3)2 results in ONE mole of O2

   starting with 5 moles you would get  2 1/2 moles of O2

       each mole of O2 weighs ( 2 * 15.99) = 31.98 g ( from periodic table)

              2 1/2 of these would weigh   79.95 g

b)   each mole of Cu(NO3)2 produces the same number of moles of Cu O

       how many moles of Cu (NO3)2  are in 87.49 g

     again from periodic table   Cu = 63.546 gm N = 14.007  O=15.999

         total mole weight of Cu(No3)2 would then be 187.554 g

                  87.49 g / 187.554 g / mole = .466 moles  the same amount of Cu O

c)    Want to try this one yourself?

The result in binary would be 10000011110101100000.

By constantly dividing the supplied number by 2 until we receive 0 as the quotient, we can convert a decimal number to a binary number in the simplest way possible. The binary value of the specified decimal number is then obtained by writing the remainders in reverse order. A binary number is made up of two 0s and 1s. Two is used as the base representation for binary numerals. As an illustration, (101)2 (101) 2. Switches can be used to encode and store numbers in binary form. This system is compatible with a variety of digital devices, including computers, calculators, digital TV decoder boxes, cell phones, burglar alarms, watches, and more. Binary values are kept in memory, which is essentially a collection of electronic on/off switches.

The complete question is- Convert 540000 to Binary form.

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Answer:

Possible reasons why EA, or electronegativity, is a positive quantity for oxygen atom include:

Explanation:

Answer:

ok, here is your answer

Explanation:

i am going to solve this problem by using the ICE table method which is an easy method to determine the pH of a weak base with the given data of the problem.Given:Initial volume of NH3 solution (Vi) = 75.0 mLInitial concentration of NH3 solution (Ci) = 0.200 MInitial moles of NH3 solution (Ni) = Ci x Vi = 0.200 M x 75.0 mL = 0.0150 molesKb = 1.8 x 10^-5Moles of HNO3 added (n) = 0.500 M x 17.0 mL = 0.00850 molesVolume of NH3 solution after the addition of HNO3 (Vf) = 75.0 mL + 17.0 mL = 92.0 mLConcentration of NH3 solution after the addition of HNO3 (Cf) = Ni / Vf = 0.0150 moles / 92.0 mL = 0.163 MTo find the pH after the addition of 17.0 mL of HNO3, we need to use the ICE table method.ICE table method:Initial: NH3 + H2O ⇌ NH4+ + OH-Change: -x 0 +x +xEquilibrium: 0.0150 - x 0 x xKb = [NH4+][OH-] / [NH3]1.8 x 10^-5 = x^2 / 0.163Solving for x, x = 0.00171 M[OH-] = 0.00171 M[OH-] = Kw / [H3O+] = 1.0 x 10^-14 / [H3O+][H3O+] = 5.85 x 10^-12pH = -log[H3O+]pH = -log(5.85 x 10^-12)pH = 11.23Therefore, the pH after the addition of 17.0 mL of HNO3 is approximately 11.23.

The average atomic mass of magnesium is 24.305 amu.

The mass of a single atom is too small to be measured directly, but chemists and physicists use the atomic mass unit (amu) to describe the mass of an atom.

The atomic mass unit is defined as 1/12th of the mass of a carbon-12 atom. Magnesium (Mg) has three isotopes: Mg-24, Mg-25, and Mg-26, with masses of 23.985 amu, 24.986 amu, and 25.983 amu, respectively.

These isotopes make up 78.99%, 10.00%, and 11.01%, respectively, of all naturally occurring Mg atoms.

The atomic mass of Mg can be calculated using the weighted average of the three isotopes as follows:Average atomic mass = (78.99/100 x 23.985 amu) + (10.00/100 x 24.986 amu) + (11.01/100 x 25.983 amu)Average atomic mass = 23.940 amu + 2.499 amu + 2.864 amuAverage atomic mass = 29.303 amu.

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Answer:

he balanced chemical equation for the reaction between NaN3 and Na2O is:

2 NaN3(s) → 2 Na(s) + 3 N2(g)

According to the stoichiometry of this equation, 2 moles of NaN3 will produce 2 moles of Na, which in turn will react with 3 moles of N2. Therefore, the volume of N2 gas produced is proportional to the volume of NaN3 used.

To find the volume of NaN3 required to produce 14.7 liters of N2, we need to use the ideal gas law:

PV = nRT

where P is the pressure of the gas, V is the volume of the gas, n is the number of moles of the gas, R is the gas constant, and T is the temperature of the gas.

Assuming standard temperature and pressure (STP), which is 0°C and 1 atmosphere, we can simplify the equation to:

V = n/22.4

where V is the volume of the gas in liters and n is the number of moles of the gas.

We can use this equation to convert the volume of N2 to moles:

n = PV/RT = (1 atm)(14.7 L)/(0.08206 L·atm/mol·K)(273 K) = 0.608 mol

According to the stoichiometry of the balanced equation, 2 moles of NaN3 will produce 0.608 mol of N2. Therefore, the number of moles of NaN3 required is:

n(NaN3) = 2 × n(N2) = 2 × 0.608 mol = 1.216 mol

Finally, we can use the molar volume of a gas at STP to convert the number of moles to volume:

V(NaN3) = n(NaN3)/22.4 = 1.216 mol/22.4 L/mol = 0.054 L

Therefore, 0.054 liters of NaN3 are required to produce 14.7 liters of Na2O.

Answer:

Normal Fault -> Tension

Reverse Fault -> Compression

Strike-Slip Fault -> Shearing

Explanation:

Normal Fault -> Tension

[] A normal fault is when the walls are being pulled apart and is caused by tension

[] Example:

         <-       ->

Reverse Fault -> Compression

[] A reverse fault is when the walls are being pushed together and is caused by compression

[] Example:

         ->        <-

Strike-Slip Fault -> Shearing

[] A strike-slip fault is when the walls are being pushed apart in parallel directions and is caused by shearing

[] Example:

         /\         \/

Note: The page you provided also gives the answers for this specific question.

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Answer:

(a) \(m_{HNO_3}=2412gHNO_3\)

(b) \(Y=80.3\%\)

Explanation:

Hello.

(a) In this case, by starting with 1216 grams of ammonia, we can firstly compute the yielded moles of NO in the first reaction considering the given yield as a fraction (0.962):

\(n_{NO}=1216 g NH_3*\frac{1molNH_3}{17gNH_3}*\frac{4molNO}{4molNH_3}*0.962=68.81molNO\)

Next, in the second chemical reaction we compute the yielded moles of NO₂ with the 91.3-percent:

\(n_{NO_2}=68.81molNO*\frac{2molNO_2}{2molNO}*0.913=62.82molNO_2\)

Finally, for the percent yield of the last chemical reaction and the molar mass of nitric acid (63 g/mol) we compute the yielded grams of nitric acid:

\(m_{HNO_3}=62.82molNO_2*\frac{2molHNO_3}{3molNO_2} *\frac{63gHNO_3}{1molHNO_3}*0.914\\ \\m_{HNO_3}=2412gHNO_3\)

(b) In this case, we compute the moles of NO, NO₂ and the grams of nitric acid as well as the previous literal yet removing the percent yields since we are going to compute theoretical yields:

\(n_{NO}=1216 g NH_3*\frac{1molNH_3}{17gNH_3}*\frac{4molNO}{4molNH_3}=71.53molNO\)

\(n_{NO_2}=71.53molNO*\frac{2molNO_2}{2molNO}=71.53molNO_2\)

\(m_{HNO_3}=71.53molNO_2*\frac{2molHNO_3}{3molNO_2} *\frac{63gHNO_3}{1molHNO_3}*0.914=3004gHNO_3\)

Thus, the overall percent yield is:

\(Y=\frac{2412g}{3004g} *100\%\\\\Y=80.3\%\)

Best regards.

The volume will increase

If the pressure of a gas is reduced while keeping the temperature constant, the volume of the gas will increase. This is known as Boyle's law, which states that the pressure of a gas is inversely proportional to its volume at a constant temperature.

In other words, if the pressure of a gas is decreased by a certain factor, the volume of the gas will increase by the same factor. For example, if the pressure of a gas is reduced to half of its initial value, the volume of the gas will double, assuming the temperature is held constant.

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Answer:

3,4,5,6,7,8

Explanation:

Groups 13  - 18 are the main group on the periodic table

The group number corresponds the number of valence electrons they contains.

Valence electrons are the number of electrons in the outermost shell of an atom.

So group 13 - 18 corresponds to a valency of 3,4,5,6,7,8.

Groups with a valency of 8 are the noble gases.

What happens to the energy produced by blocks of Earth's crust slipping past each other is it radiates outward in all directions. (Option C).

When blocks of the Earth's crust slip past each other during an earthquake, the energy that is released does not disappear, spread out randomly, or increase as it reaches the surface.

Instead, the energy radiates outward in the form of seismic waves. These seismic waves travel through the Earth in all directions from the point of the earthquake's origin causing the ground to shake.

The energy carried by these waves is what is felt as the shaking during an earthquake and can be detected and measured by seismometers.

Thus, what happens to the energy produced by blocks of Earth's crust slipping past each other is it radiates outward in all directions.

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The molecular formula is obtained from the empirical formula by multiplying with an integer which is get by dividing the molecular mass by the formula mass. Thus if the integer is 2, then the molecular formula of the compound is C₁₄H₁₀O₄.

The molecular formula of a compound is used to represent the atom present in the compound with their correct number of moles. The empirical formula is derived from the mass percents of the elements in the whole compound.

The integer we get from dividing the molar mass by the formula mass is multiplied with the numbers in the empirical formula to get the molecular formula. Here, the empirical formula is C₇H₅O₂. Thus by multiplying it by 2 we get C₁₄H₁₀O₄.

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It is the simplest whole number ratio of elements in a compound. Molecular formula is n times the empirical formula, where n is integers 1,2,... The molecular formula is C\(_{14}\)H\(_{10}\)O\(_{4}\).

Empirical formula gives the proportion of the element that is present in a compound. It does not give information about the actual number or the arrangements of the atoms.

n= molecular formula÷ empirical formula

Empirical formula =C\(_7\)H\(_5\)0\(_2\)

n=2

Substituting the given values

2= molecular formula÷ C\(_7\)H\(_5\)0\(_2\)

molecular formula=  C\(_7\)H\(_5\)0\(_2\)×2

molecular formula=C\(_{14}\)H\(_{10}\)O\(_{4}\)

Therefore, the molecular formula of the compound C\(_7\)H\(_5\)0\(_2\) is C\(_{14}\)H\(_{10}\)O\(_{4}\).

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Answer:

igneous rocks

Explanation:

One type of rock that forms very quickly would be igneous rocks. These are rocks that form after a volcanic eruption, where the molten magma melts everything into lava which then hardens shortly after. This creates a new rock that is a mixture of many other materials called Igneous rocks. Once hardened they usually remain stable and unchanged for a very long time until the next volcanic eruption. An example if the eruption of Tambora which after finishing has created lots of igneous rocks and has not erupted again since 1815.

A rock form easily through volcanic eruption, and remain stable, or unchanged, for a very long period of time because of strong bonding in constitute minerals.

Rock is a solid substance which is naturally occur in the environment, it is made up from minerals. Mainly three types of rocks are present, which are igneous rock, metamorphic rock and sedimentary rock.

We obtain rocks generally by the volcanic eruption and as it is made up of minerals and different minerals have different crystal structure and bonding in these minerals are very strong which not break easily. That's why rocks remain stable or unchanged for a very long time. Only volcanic eruption will break rocks because only they have that much of energy to break. Examples of hard rocks are granite, syenite, unikite, andesite, etc.

Hence, due to strong bonds rocks will stay stable for long time.

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Answer:

  0.690 g/mL

Explanation:

Density is the ratio of mass to volume:

  gasoline mass = (flask+gas mass) - (flask mass) = 145.028 g -110.525 g

  gasoline mass = 34.503 g

Density = (gas mass)/(gas volume) = (34.503 g)/(50.0 mL)

Density = 0.690 g/mL

_____

The least-precise number in this calculation is the sample volume, which has 3 significant figures. Thus, the answer is good only to 3 significant figures.

The molarity of the acid is the 64.3dm³

Molarity is the amount of a substance in a certain volume of solution

Here given data is

25 cm³ of a solution of 0.1 mol dm-³ NaOH reacts with 51.5 cm³ of a solution of hydrochloric acid

We have to calculate molarity = ?

So the molarity = number of moles of solute/volume of solution in L or dm³

1. 25 cm³ = 1.25ml = volume

Molarity =  51.5 cm³ × 1.25ml

Molarity = 64.3dm³

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