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Niobium has an atomic mass of 92.90638 u. An atomic mass unit serves as the unit of measurement for mass (amu). A mass unit of an atom is 1.66 x 10-24 grammes.

What does the term "atomic" refer to?

Atomic is derived from the Greek word atomos, which means "uncut" or "indivisible," and means "indivisible particle" in Latin. atomic is defined as an adjective that refers to, contains, or is related to atoms.

What does atomic energy entail?

Nuclear energy, also known as atomic energy, is the considerable quantity of energy released in operations that have an impact on atomic nuclei, or dense centres of atoms. It differs from other atomic phenomena' energy, which solely involves an atom's orbital electrons in regular chemical reactions, for example.

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Answer:

1 mole of Nb = 92.906 grams

The expected result as the concentration of HCl(aq) increases from 0.050 M to 0.50 M is: (B) The reaction time decreases, and the rate of the reaction increases.

An aqueous solution of hydrogen chloride is what is known as hydrochloric acid, also referred to as muriatic acid. It has an unmistakably strong odor and is colorless. It is categorized as a powerful acid. It is a part of the gastric acid in most animal species' digestive systems, including humans.

The expected result as the concentration of HCl(aq) increases from 0.050 M to 0.50 M is that the reaction time decreases, and the rate of the reaction increases. This is because as the concentration of the acid increases, the number of acid molecules in the solution increases and therefore the number of collisions between acid molecules and magnesium increases. This leads to more frequent and successful collisions and a faster rate of reaction.

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Answer: 0.31

Explanation:

molarity = 0.32 mol of solute / 1 L solution

find kg of solute: 0.32 mol of solute x 146.8 g/mol = 46.976 g = 0.046976 kg

find kg of solution: 1 L solution x (1000 mL / 1 L) x (1.08 g/mL) (1 kg / 1000 g) = 1.08 kg solution

find kg of solvent: 1.08 kg solution - 0.046976 kg solute =  1.033 kg water

molality = 0.32 mol solute / 1.033 kg water = 0.31 mol/kg

According to molar concentration , the molality of the solution upto second decimal place  is 0.31  m.

Molar concentration is defined as a measure by which concentration of chemical substances present in a solution are determined. It is defined in particular reference to solute concentration in a solution . Most commonly used unit for molar concentration is moles/liter.

The molar concentration depends on change in volume of the solution which is mainly due to thermal expansion.

molarity = 0.32 mol of solute / 1 L solution.To find kg of solute-0.32 mol of solute x 146.8 g/mol = 46.976 g = 0.046976 kg. To find kg of solution: 1 L solution x (1000 mL / 1 L) x (1.08 g/mL) (1 kg / 1000 g) = 1.08 kg solution. To find kg of solvent: 1.08 kg solution - 0.046976 kg solute =  1.033 kg water.

Thus, molality = 0.32 mol solute / 1.033 kg water = 0.31 mol/kg.

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Answer:

500K

Explanation:

We use Charle's law that states that at a constant pressure the volume of a given mass of a gas varies linearly with absolute temperature of the gas.

V ∝ T

V = kT

∴ k is the proportionality constant

v/T = as it a ratio between volume and temperature the value of k would be a constant quantity.

Therefore it can be written as:

v1 / T1 = V2 / T2

Now solving the question:

V1 = 600 torr

T1 = 300 K

V2 = 1000 torr

T2 = ?

600/300 = 1000/T2

T2= (1000 x 300)/600

T2= 500 K

18.25 mL of a 2.63 M solution you need to dilute to 100 mL with a final solution concentration of 0.48.

The amount of a substance is often measured by how much it weighs – i.e. in g or mg or kg etc. The concentration is the amount divided by the volume it is dissolved in. concentration = amount divided by volume

Another way of representing the amount of a substance is to use the concept of mole. A mole is simply 6.0223 x 1023 molecules (this is “Avogadro’s number”)

Eggs come in dozens (12), molecules come in moles (6 x 1023) The mass of a mole of molecules is the formula weight in grams. This is sometimes called “molar mass” with symbol M. Sometimes it is referred to as molecular weight. Sometimes it is called “relative molecular mass” since the mass of a carbon element is designated to be 12 and other molecules or elements are given masses relative to that.

The molar mass of a small molecule such as an amino acid (eg glycine is NH2CH2COOH and has molecular mass = 75.07 g.mol-1) is much less than the molar mass of a protein (eg haemoglobin has molecular mass ~ 64500 g.mol-1).

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The Lewis structure for acetamide is drawn by connecting the atoms with single bonds and assigning lone pairs of electrons to the non-bonding atoms.

The central carbon atom has four bonds and no lone pairs, while the oxygen atom has two bonds and two lone pairs. The two nitrogen atoms each have three bonds and one lone pair. The hydrogen atoms only have one bond each, as they only have one electron in their outer shell.

For the resonance forms of acetamide, the Lewis structure is drawn by connecting the atoms using double bonds instead of single bonds, while keeping the same number of lone pairs.

This forms a resonance hybrid between the two forms, where the electrons are delocalized. The central carbon atom has two double bonds and no lone pairs, while the oxygen atom has one double bond and two lone pairs. The two nitrogen atoms each have two double bonds and one lone pair. The hydrogen atoms also only have one bond each.

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The balanced chemical reaction of sodium and sulfur can best be described as: B. 2Na(s) + S(s) → Na₂S(s)

To represent the reaction between sodium and sulfur, we would express the elements and their states as shown above. So, 2 atoms of sodium would react with 1 atom of sulphur to yield a compund known as sodium sulphide.

This compound contains two atoms of sodium and 1 atom of sulphur. The physical state is solid. So, the correct option number that expresses this is B.

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The Equilibrium Constant Concentration of Fe(NO3)3 is Keq 2.79*10^2 and molar extinction coefficient is 4438 L/mol.

Slope of the above calibration curve represents molar extinction coefficient  in L/mol for Fe(SCN)2+.

Hence

= 4438 L/mol

B. Determination of K:

Test tube-2: A = 0.193

=> [Fe(SCN)2+]eq = A /

b = 0.193 / 4438 L/mol x 1 = 4.35x10-5 M 

[Fe3+]eq = 0.001 - 4.35x10-5 M = 9.565x10-4 M 

[SCN-]eq = 2.0x10-4 M - 4.35x10-5 M = 1.565x10-4 M

Keq = [Fe(SCN)2+]eq / ([Fe3+]eq x [SCN-]eq) 

=> Keq = 4.35x10-5 M / ( 9.565x10-4 Mx1.565x10-4 M) = 2.91x102 

Test tube-3: A = 0.331

=> [Fe(SCN)2+]eq = A /

b = 0.331 / 4438 L/mol x 1 = 7.46x10-5 M

[Fe3+]eq = 0.001 - 7.46x10-5 M = 9.254x10-4 M 

[SCN-]eq = 4.0x10-4 M - 7.46x10-5 M = 3.254x10-4 M

Keq = [Fe(SCN)2+]eq / ([Fe3+]eq x [SCN-]eq) 

=> Keq = 7.46x10-5 M / (9.254x10-4 Mx3.254x10-4 M) = 2.48x102 

Test tube-4: A = 0.512

=> [Fe(SCN)2+]eq = A /

b = 0.512 / 4438 L/mol x 1 = 1.15x10-4 M

[Fe3+]eq = 0.001 - 1.15x10-4 M = 8.85x10-4 M 

[SCN-]eq = 6.0x10-4 M - 1.15x10-4 M = 4.5x10-4 M

Keq = [Fe(SCN)2+]eq / ([Fe3+]eq x [SCN-]eq) 

=> Keq = 1.15x10-4 M / (8.85x10-4 Mx4.5x10-4 M) = 2.89x102 

Test tube-5: A = 0.634

=> [Fe(SCN)2+]eq = A

b = 0.634 / 4438 L/mol x 1 = 1.43x10-4 M

[Fe3+]eq = 0.001 - 1.43x10-4 M = 8.57x10-4 M 

[SCN-]eq = 8.0x10-4 M - 1.43x10-4 M = 6.57x10-4 M

Keq = [Fe(SCN)2+]eq / ([Fe3+]eq x [SCN-]eq) 

=> Keq = 1.43x10-4 M / (8.57x10-4 Mx6.57x10-4 M) = 2.54x102 

Test tube-6: A = 0.890

=> [Fe(SCN)2+]eq = A /



b = 0.890 / 4438 L/mol x 1 = 2.01x10-4 M  

[Fe3+]eq = 0.001 - 2.01x10-4 M = 7.99x10-4 M 

[SCN-]eq = 0.001 M - 2.01x10-4 M = 7.995x10-4 M

Keq = [Fe(SCN)2+]eq / ([Fe3+]eq x [SCN-]eq) 

=> Keq = 2.01x10-4 M / (7.99x10-4 Mx7.99x10-4 M) = 3.15x102 

Average Keq

= (2.91x102 +2.48x102 +2.89x102 +2.54x102 +3.15x102 ) / 5

=  2.79x102 

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The molecular formula of the chemical substance is C2H3 * 2.068 = C4H6 which is option (c)

The empirical formula of a chemical substance gives the lowest whole-number ratio of atoms in a molecule. The molar mass of a substance is the mass of one mole of the substance. To find the molecular formula of a substance, we need to determine the ratio of atoms in the molecule and compare it to the ratio given by the empirical formula.

The molar mass of the substance is 54.091 g/mol, and the empirical formula is C2H3. To find the molecular formula, we can divide the molar mass by the molar mass of the empirical formula.

54.091 g/mol / (2 x 12.011 g/mol + 3 x 1.008 g/mol) = 54.091 g/mol / 26.042 g/mol = 2.068

Since the ratio of atoms in the molecule is 2.068 times that of the empirical formula, the molecular formula is C2H3 * 2.068 = C4H6 which is option (c)

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Answer:

C4H6 (c)

Explanation:

I took the test

Pea plants uses the light energy from sun for photosynthesis and they synthesis chemical energy in leaves.

Photosynthesis is a biochemical process taking place in green plants to synthesis energy with the aid of light energy. The green pigments chlorophyll absorbs enough light energy for this biochemical reactions.

The photosynthetic reaction is the reaction between water and carbon dioxide producing glucose and oxygen. Thus, this process intakes carbon dioxide that we exhale and release oxygen that aids our respiration.

Pea plants are green plants undergoing photosynthesis. They uses light energy to produce chemical energy. With the presence of sunlight, they can easily carry photosynthetic reaction in leaves.

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Sister chromatids is the term for the chromosomes that are identical after DNA replication.

Sister chromatids are identical chromosomes that are created during the process of DNA replication. DNA replication is the process where a DNA strand is copied, creating a new strand. During this process, each chromosome is split in half, forming two identical halves.

These halves are known as sister chromatids and are held together by a centromere. Sister chromatids are attached to one another during the interphase stage of the cell cycle and are separated during the metaphase stage of the cell cycle.

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Cyanides inhibit lactose permease by abolishing the proton gradient between the inside and outside of the cell

By interfering with the proton gradient across the cell membrane, cyanides prevent the lactose permease protein from transporting lactose across the membrane. Protons (H+) are pumped out of the cell by the proton-motive force, which results in a difference in proton concentration between the inside and outside of the cell and creates the proton gradient.

This proton gradient is used by lactose permease to propel lactose transport into the cell. The enzyme cytochrome oxidase, which is found in the mitochondria and is in charge of the last stage of the electron transport chain, binds to the iron atom in the active site. This binding prevents the enzyme from working, which inhibits proton pumping and causes the proton gradient to fall, both of which hinder lactose permease from working.

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The correct condensed structure of hexene is CH₃CH₂CH=CHCH₂CH₃.

A condensed structural formula also termed as semi-structural formula and it is used to describe the organic compounds in a line of text. They will be illustrated in a single line of text and specifies the atoms in the order which are located in a molecule.

Hexene is a hydrocarbon having chemical formula C₆H₁₂. It s used as a comonomer in the production of the polyethylene. There are several number of isomers in hexene, depending on the geometry and position of the double bond in the chain. One of the most common useful of isomers is 1-hexene as well as an alpha-olefin.

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In chemistry, the empirical formula of a chemical compound is the simplest whole number ratio of atoms present in a compound.

The empirical formula is BH₃. Its B:H ratio is 1:3.

Assume that you have 100 g of the compound.

Then you have 78.14 g B and 21.86 g H.

Now, we must convert these masses to moles and find their ratios.

From here on, I like to summarize the calculations in a table.

Element  Mass/g    Moles     Ratio     Integers

B          78.14      7.2285    1                    1

H          21.86    21.686      3.0001          3

The empirical formula is BH₃.

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The empirical formula will have a boron to hydrogen ratio of 1:3.

In chemistry, the empirical formula of a chemical compound is the simplest whole number ratio of atoms present in a compound. A simple example of this concept is that the empirical formula of sulfur monoxide, or SO, would simply be SO, as is the empirical formula of disulfur dioxide, S2O2.

Thus, sulfur monoxide and disulfur dioxide, both compounds of sulfur and oxygen, have the same empirical formula. However, their molecular formulas, which express the number of atoms in each molecule of a chemical compound, are not the same.

The molecular formula, on the other hand, shows the number of each type of atom in a molecule. The structural formula shows the arrangement of the molecule. It is also possible for different types of compounds to have equal empirical formulas.

The empirical formula is BH₃. Its B:H ratio is 1:3.

Assume that you have 100 g of the compound.

Then you have 78.14 g B and 21.86 g H.

Now, we must convert these masses to moles and find their ratios.

From here on, I like to summarize the calculations in a table.

Element   Mass/g    Moles     Ratio     Integers

B              78.14      7.2285    1                    1

H              21.86    21.686      3.0001          3

The empirical formula is [tex]BH_{3}[/tex].

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Answer:

H is 2.74%

Cl is 97.24%

Explanation:

HCl molar mass is 36.458

H is 1 so 1/36.458 is .0274 or 2.74 percent

Cl is 35.453 so 35.453/36.458 is .9724 or 97.24 percent

A liquid at 50 degrees Celsius would have a melting point of 50 degrees Celsius and a boiling point of approximately 173.15 degrees Celsius.

What is the liquid?

iquid is a state of matter that has a definite volume, but does not have a fixed shape. It is one of the four fundamental states of matter, along with solid, gas, and plasma. Liquids tend to have a greater volume than solids, but geneLrally take the shape of their container. Examples of liquids include water, milk, blood, gasoline, and oil. Liquids are composed of molecules that tend to have greater mobility and can easily flow past each other. Depending on the temperature, pressure, and composition of the liquid, it can undergo changes in the state of matter.

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Give a handwritten explanation and response. Estimate the expected melting temperature of cadmium (Cd), vanadium, and other elements based on the patterns you have found.

What does melting point mean?

The temperature at which a pure substance's solid and liquid states can coexist in equilibrium is known as the melting point. A solid's temperature will rise when heat is added to it until its melting point is reached.

How do melting and boiling points differ?

The melting point

The temperature that a quality of output into a liquid under normal air pressure is known as the melting point. The temperature at which a liquid's vapor pressure equals the pressure around it, turning the liquid into vapor (and vice versa).

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The result of the Coriolis effect is the rotation of the earth on its axis. So the correct option is B.

The Coriolis effect is a type of force to which the fluids of the earth are exposed. It is the acceleration they receive due to the rotation of the earth, what is generated is a deviation in their trajectory which now causes their trajectory to be curved. This force it is exposed to is called the coriolis force, but it is not a real force since there is nothing pushing on it.

The acceleration to which the fluids are exposed will be perpendicular to the axis of rotation of the earth and to the components of its velocity.

Therefore, we can confirm that the correct option is B. the rotation of the earth on its axis.

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The Coriolis effect is the result of which of the following?

A. winds spinning off the equator

B. the rotation of the earth on its axis

C. the different air movements north and south of the equator

D. the friction that slows down winds near the earth’s surface

The molecular formula gives the actual number of atoms of each element present in a molecule, while the empirical formula gives the simplest whole number ratio of atoms of each element present in a molecule.

The molecular formula and the empirical formula of a compound are related but they are not the same. The molecular formula is the actual number of atoms of each element present in a molecule of the compound, while the empirical formula gives the simplest whole number ratio of atoms of each element present in a molecule of the compound.

In other words, the molecular formula expresses the exact number of atoms of each element present in a molecule and the empirical formula expresses the relative number of atoms of each element. For example, glucose has a molecular formula of C6H12O6, but its empirical formula is CH2O, which gives the simplest ratio of atoms in the molecule. In general, the molecular formula can be a multiple of the empirical formula.

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Answer:

liquid carbon disulfide and oxygen gas produce carbon dioxide gas and sulfur dioxide gas

Explanation:

So the new concentration of the solution is 0.0001M.

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The four types of verbal irony are verbal irony, sarcasm, innuendo, and hyperbole.

Verbal irony is the intentional use of words to express something different from what is said. It is a figure of speech often used for comedic effect, to emphasize a point or to add emphasis.

Sarcasm is a type of verbal irony that is used to mock, ridicule, or criticize someone. Innuendo is a type of verbal irony that implies a hidden meaning or suggests something without directly saying it.

Finally, hyperbole is an exaggerated statement used in an attempt to make a point or to emphasize something. All four types of verbal irony can be used to make a point more effectively or to add humor to a conversation.

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A tank containing 35 gallons of water is leaking at a rate of 1/4 gallon per minute. The expression to determine the number of gallons left in the tank after m minutes is  35- m/4.

Considering that a 35-gallon water tank leaks at a rate of a quarter per minute.

Let "m" stand for the duration in minutes.

Gallons remaining in the tank equal the sum of the water that was originally inside and the water that has leaked.

35 gallons of water are still available after subtracting the amount of minutes spent at the rate of leakage.

Water remaining in gallons = 35 gallons - m minutes x 1/4

Water remaining in gallons = 35 - m/4

Your question is incomplete but most probably your full question was

A tank containing 35 gallons of water is leaking at a rate of 1/4 gallon per minute. Write an expression to determine the number of gallons left in the tank after m minutes.

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To solve this problem is not necessary to have the chemical reaction. Just use the formula of Molarity and solve it for moles.

moles = 0.2 x 0.025=0.005.

The complete question is:

NaOH (aq) + HCl(aq) H2O + NaCl (aq)

If 25.0 mL of a 0.2 M NaOH solution is used for the reaction

shown above, how many moles of NaOH were involved in the

reaction? _moles.

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The number of moles for the chemical reaction will be equal to 0.005, if 25.0 ml of a 2.0 m NaOH solution are used.

The amount of a material is expressed in moles, which are represented by the symbol mol in the International System of Units. A substance's amount is a measurement of how many of its fundamental components are present in an object or sample. To define a mole, precisely 6.022140761023, elementary components are needed.

The term "mole" (symbol: mol) refers to the amount of matter in a system that contains the same number of atoms as there are in 0.012 kilograms of carbon 12. Previously, a mole was determined through experimentation to be the number of atoms present in 12 grammes of carbon-12.

moles = 0.2 x 0.025=0.005.

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The complete question is:

NaOH (aq) + HCl(aq) H2O + NaCl (aq)

If 25.0 mL of a 0.2 M NaOH solution is used for the reaction

shown above, how many moles of NaOH were involved in the

reaction? _moles.

A person uses 720 kcal on a long bike. A. The energy in joules is equal to 3221680 Joules. B. The energy in kilojoules is 3221.689 KJ.

The term energy is defined as the capacity for doing work. It is exist in different types like potential, kinetic, thermal, electrical, chemical, nuclear, or other forms.

Given the energy used for the bike is 770 kcal.

We know that

1 cal = 4.184 J

The energy in Joules = 770 × 1000 × 4.184

= 3221680 J

The energy in kilojoules =  3221689 / 1000

= 3221.689 KJ

Thus, A. The energy in joules is equal to 3221680 Joules. B. The energy in kilojoules is 3221.689 KJ.

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The number of ammonia molecules made when 6 grams of hydrogen gas reacts with excess nitrogen is 12  × 10²³ molecules.

The reaction is given as :

3H₂   +   N₂  ⇄    2NH₃

Mass of the hydrogen = 6 g

moles of the hydrogen = mass / molar mass

                                      = 6 / 2

                                      = 3 mol

3 moles of the H₂   produces 2 moles of the NH₃

moles of the NH₃ = (2 / 3)  × 3

                             = 2 mol

1 mol = 6.022 × 10²³ molecules

molecules of the ammonia, NH₃ = 2 × 6.022 × 10²³ molecules

                                                      = 12  × 10²³ molecules

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Answer:

Vfinal = 22.7 L

Explanation:

PV = nRT

(2.0 atm)(20 L) = n(0.0821 L-atm/K-mol)(273 K)

n = 0.195 moles of CO2

P (final)V (final) = nRT

(380 mmHg)(Vfinal) = (0.195 moles)(0.0821 L-atm/K-mol)(273 K)

Vfinal = 22.7 L

Option (c) is correct. The number of neutrons will not be find in the periodic table.

Periodic table is the arrangement of chemical elements. Chemical elements are arranged in rows that is called periods and columns that is called groups according to increasing atomic number. Scientists use the periodic table to refer to information about an element like atomic mass and chemical symbol. The periodic table’s arrangement also allows to discern trends in element properties including electronegativity, ionization energy, and atomic radius. We can find the name of the element, symbol, atomic weight of the element, atomic number. We can not find the number of neutrons in the periodic table. the properties of the chemical elements exhibit an approximate periodic dependence on their atomic numbers.

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One single amino acid weighs 110 D a. Now, this problem is fairly simple. The way we find out, the weight of 701 amino acids is just multiplying. Ah, that number by 110. So all we have to dio is multiply 682 by 110. So our final answer will be 77,110.

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