Which of the following changes requires an oxidizing agent?
O2 yields 2O2-
SO3 yields SO42-
2F- yields F2
MnO2 yields Mn2+

The atomic number and mass number for the carbon isotope with seven neutrons are 6 and 13, respectively.

The atomic number and mass number for the carbon isotope with seven neutrons can be determined using the information given. The atomic number of an element is equal to the number of protons in its nucleus, which for carbon is always 6. The mass number is the sum of the protons and neutrons in the nucleus, so for carbon with seven neutrons, the mass number is 13. Therefore, the atomic number and mass number for the carbon isotope with seven neutrons are 6 and 13, respectively.

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Answer:

0.0109 mol

Explanation:

Took the exam.

Final answer:

A polar covalent bond is a type of covalent bond with unequal sharing of electrons due to a difference in electronegativity between the bonded atoms, leading to a partial negative and positive charge on the atoms.

Explanation:

The best definition of a polar covalent bond is a type of covalent bond in which the electrons are shared unequally between the bonded atoms. This disparity in sharing occurs because the atoms involved have different electronegativities - a measure of how strongly an atom attracts electrons in a bond.

When the difference in electronegativities between the two atoms falls between 0.4 and 1.7, the electrons are not shared equally, leading to a polar bond. One atom attracts the shared electrons more strongly, giving it a partial negative charge, while the other atom acquires a partial positive charge, creating a dipole.

In contrast, a nonpolar covalent bond occurs when the electronegativity difference is less than 0.4, resulting in equal sharing of electrons and no dipole. On the opposite end of the spectrum, if the difference in electronegativity is greater than 1.7, it may lead to an ionic bond, where electrons are transferred rather than shared.

A polar covalent bond is a type of covalent bond where the electrons are shared unequally between the bonded atoms.

This happens because the atoms involved have different electronegativities, meaning one atom attracts the shared electrons more strongly than the other. Typically, if the difference in electronegativity between the atoms is between 0.4 and 1.7, the bond is considered polar covalent.

Due to this unequal sharing, the molecule has regions with partial positive and partial negative charges, leading to an imbalance in electron distribution. These partial charges create a dipole moment within the molecule, making it polar.

The mass number of an isotope is expressed in the name of an atom by placing it after the element's name, separated by a hyphen. For example, Carbon-12.

The mass number of an isotope is represented in the name of an atom by placing it after the element's name, separated by a hyphen. For example, carbon with a mass number of 12 is represented as Carbon-12.

This mass number represents the total number of protons and neutrons in the nucleus of an atom. As isotopes of an element have the same number of protons, but different numbers of neutrons, the mass number differentiates one isotope from another. So, Carbon-12 and Carbon-14 are two isotopes of the Carbon element.

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The balanced chemical equation for the decomposition of TNT into nitrogen gas, water vapor, carbon dioxide, and solid carbon is: 2 C7H5N3O6(s) → 3 N2(g) + 5 H2O(g) + 7 CO(g) + 7C(s). This reaction is exothermic, meaning it releases energy.

The decomposition of TNT (trinitrotoluene) can be represented by a balanced chemical equation that includes solid carbon (C) as one of the products, along with gaseous nitrogen (N2), carbon dioxide (CO2), and water vapor (H2O). The balanced equation is derived by ensuring that the number of atoms for each element is equal on both sides of the reaction. The balanced equation for TNT decomposition is:

2 C7H5N3O6(s) → 3 N2(g) + 5 H2O(g) + 7 CO(g) + 7C(s)

This reaction is exothermic, releasing energy upon explosion. However, it is important to note that the real decomposition of TNT can be more complex, and the products can vary depending on the conditions. For simplicity, this equation assumes that all the carbon is converted to solid carbon, not carbon monoxide or carbon dioxide which could also be formed.

Final answer:

To find the molecular formula of a compound with a given percent composition and molar mass, we first determine the empirical formula based on the moles ratio of elements. Then, by comparing the molar mass of the empirical formula to the given molar mass, we identify the molecular formula as C6H12O6 (glucose).

Explanation:

The question asks for the molecular formula of a compound with a known percent composition and molar mass. First, we calculate the empirical formula using the percent composition by assuming a 100g sample, thus directly converting percentages to grams. Then, we divide the masses by the molar mass of each element to get the mole ratio. Finally, we find the molecular formula by relating the empirical formula mass to the given molar mass of the compound.

Step 1: Calculate moles based on percent composition

Carbon (C): 40.0g, determining moles as 40.0g / 12.01g/mol = 3.33 moles

Hydrogen (H): 6.72g, determining moles as 6.72g / 1.01g/mol = 6.65 moles

Oxygen (O): 53.28g, determining moles as 53.28g / 16.00g/mol = 3.33 moles

Step 2: Determine the empirical formula

The moles ratio for C:H:O roughly simplifies to Int(1):2:1, indicating the empirical formula CH2O.

Step 3: Determine the molecular formula

The molar mass of the empirical formula (CH2O) is 30 g/mol. Since the compound's molar mass is given as 180 g/mol, this suggests the molecular formula contains six times the number of atoms in the empirical formula, making it C6H12O6, which is the molecular formula for glucose.

Answer:508

Explanation:

I saw from another post or actually 507.8

Answer: It binds protons and neutrons

Explanation:  Nuclear forces are that kind of forces of attraction which binds the nucleons around the nucleus.

Nucleons are the particles present in the nucleus . Thus protons and neutrons are known as Nucleons.

Protons are positively charged particle and neutrons are neutral in nature and they both experience almost identical forces of attraction.

Answer:

[tex]6.19*10}^{6}[/tex] g of Oxygen

Explanation:

In order to answer the question the Avogadro´s number is needed:

Avogadro´s number = [tex]6.022*10^{23}[/tex][tex]mol^{-1}[/tex]

Calculate the mass using the Avogadro´s number:

[tex]2.33*10^{20}atomsO*\frac{1molO}{6.022*10^{23}atomsO}*\frac{16gO}{1molO}*\frac{1*10^{9}g}{1g}=6.19*10}^{6}[/tex] g of Oxygen

Jon and Katarina use the same method for completing a lab report because they are both using scientific inquiry to conduct their experiments.

Jon and Katarina use the same method for completing a lab report because they are both using scientific inquiry to conduct their experiments. The scientific method is a process that scientists follow to gather information, form hypotheses, test their hypotheses through experiments, and draw conclusions based on their results. It is a systematic and organized approach that can be applied to various scientific disciplines, including chemistry and geology.

The correct answer among the choices would be:

D. Fluorine (F)

Among all the elements, fluorine is the most electronegative element. Electronegativity refers to the measure of tendency of an electron to be attracted to that element. Since Fluorine is very electronegative, it can easily absorb the electrons of other elements. Since it sucks up electron, this gives Fluorine an excess electron thus making it a negative ion F-.

Answer: Bromine (Br)

Explanation:

Answer:

protons in the atom

Explanation:

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To solve this problem, first we assume the volume is purely additive. The density of the mixture can then be calculated by the summation of mass fraction of each component divided by its individual density:

1 / ρ mixture = (x NH3 / ρ NH3) + (x H2O / ρ H2O)                        ---> 1

Calculating for mass fraction of NH3:

x NH3 = 15 g / (15 g + 250 g)

x NH3 = 0.0566

Therefore the mass fraction of water is:

x H2O = 1 – x NH3 = 1 – 0.0566

x H2O = 0.9434

Assuming that the density of water is 1 g / mL and substituting the known values back to equation 1:

1 / 0.974 g / mL = [0.0566 / (ρ NH3)] + [0.9434 / (1 g / mL)]

ρ NH3 = 0.680 g / mL

Given the density of NH3, now we can calculate for the volume of NH3:

V NH3 = 15 g / 0.680 g / mL

V NH3 = 22.07 mL

The number of moles NH3 is: (molar mass NH3 is 17.03 g / mol)

n NH3 = 15 g / 17.03 g / mol

n NH3 = 0.881 mol

Therefore the molarity of NH3 in the solution is:

Molarity = 0.881 mol / [(22.07 mL  + 250 mL) * (1L / 1000 mL)

M = 3.238 mol/L = 3.24 M

To find the molarity of the NH3 solution, divide the moles of NH3 by the volume of the solution in liters.

To find the molarity of the NH3 solution, we need to first calculate the moles of NH3. We can do this by dividing the mass of NH3 (15.0 g) by its molar mass (17.03 g/mol) to get 0.881 mol. Next, we need to calculate the volume of the solution. Because density is mass divided by volume, we can rearrange the equation to solve for volume, which is mass divided by density. Substituting in the given values, we get 250.0 g / 0.974 g/ml = 256.62 ml. Since 1 ml is equal to 0.001 L, the volume of the solution is 0.25662 L. Finally, we can calculate the molarity by dividing the number of moles of solute (NH3) by the volume of the solution in liters. Substituting the values, we get 0.881 mol / 0.25662 L = 3.43 M.

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Answer:

B) Nitrogen monoxide gas plus hydrogen gas yields ammonia gas plus water vapor

Explanation:

The given reaction is:

[tex]2NO(g) + 5H_{2}(g)\rightarrow 2NH_{3}(g)+ 2H_{2}O(g)[/tex]

Here the chemical names of the reactants are:

NO = nitric oxide or nitrogen monoxide in gas phase

H2 = hydrogen gas

NH3 = ammonia in gas phase

H2O = water in gas phase i.e. vapor

Therefore the reaction can be expressed in words as:

Nitrogen monoxide gas plus hydrogen gas yields ammonia gas plus water vapor

Answer: The correct answer is atomic number, mass number.

Explanation:

Isotopes are defined as the chemical species which have same number of protons but differ in the number of neutrons.

It can also be said that they are the chemical species of the same element which have same atomic number but have different mass number.

For Example:  [tex]_6^{12}\textrm{C}\text{ and }_6^{14}\textrm{C}[/tex] are the isotopes of carbon element, which have same atomic number but different mass number.

Hence, the correct answer is atomic number, mass number.

The true statement about color in a fiber is that the color depends upon the lighting source, because fibers absorb some wavelengths of light and reflect others. Different illumination can change the perceived color of the fiber.

The statement 'the color depends upon the lighting source' is true when considering color in a fiber. The true color of an object, including fibers, is defined by its absorptive or reflective characteristics, which is how the object interacts with various wavelengths of light. When an object is illuminated by white light (a mixture of all visible wavelengths), it reflects some wavelengths while absorbing others; the reflected wavelengths determine the color we perceive. If illuminated by colored light, the object can appear a different color. For example, under pure red light, a blue object will appear black because it absorbs the red light. Furthermore, the color of fibers is not always a result of pigments as structural coloration also exists, and there is a wide variety of dyes that can be used for fibers, not just a few.

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Answer:

26 protons, 26 electrons, 30 neutrons

Explanation:

Let P = protons, N = neutrons, E = electrons

The mass number of an atom is the sum of protons and neutrons in the nucleus of the atom.

The number of neutrons is the difference between the mass and atomic numbers of the atom

Therefore, 56 = P + N

where N = 56 - 26

N = 30

That means the number of neutrons is 30

To find P, 56 = P + N, N being 30

56 is now P + 30

56 = P + 30

56 - 30 = P

P = 26

Now, for an atom in its neutral state, the number of electrons is equal to the number of protons

Therefore, E is also 26

Answer:

The diagonal rule states that electrons fill orbitals in order of increasing "quantum number sum" (n + ℓ). When two orbitals share the same "quantum number sum", they will be filled in order of increasing n.

Explanation:The electrons in an atom fill up its atomic orbitals according to the Aufbau Principle; "Aufbau," in German, means "building up." The Aufbau Principle, which incorporates the Pauli Exclusion Principle and Hund's Rule prescribes a few simple rules to determine the order in which electrons fill atomic orbitals:

Electrons always fill orbitals of lower energy first. 1s is filled before 2s, and 2s before 2p.

The Pauli Exclusion Principle states no two electrons within a particular atom can have identical quantum numbers. In function, this principle means that if two electrons occupy the same orbital, they must have opposite spin.

Hund's Rule states that when an electron joins an atom and has to choose between two or more orbitals of the same energy, the electron will prefer to enter an empty orbital rather than one already occupied. As more electrons are added to the atom, these electrons tend to half-fill orbitals of the same energy before pairing with existing electrons to fill orbitals.

Valence Electrons:

The outermost orbital shell of an atom is called its valence shell, and the electrons in the valence shell are valence electrons. Valence electrons are the highest energy electrons in an atom and are therefore the most reactive. While inner electrons (those not in the valence shell) typically don't participate in chemical bonding and reactions, valence electrons can be gained, lost, or shared to form chemical bonds. For this reason, elements with the same number of valence electrons tend to have similar chemical properties, since they tend to gain, lose, or share valence electrons in the same way. The Periodic Table was designed with this feature in mind. Each element has a number of valence electrons equal to its group number on the Periodic Table.

The volume of solid ice is greater than the volume of water. In winter in the absence of heat water in the pipe freezes, as ice takes greater space to fit in than water, the pipe burst in winter in the absence of heating.

Freezing of water is an exothermic process (heat is released by the system into the surrounding) where as melting of ice is an endothermic process (heat is absorbed by the system from the surrounding). If the heat was on it would prevent ice formation in the pipes.

The water pipes burst due to the expansion of water in them.

Water behaves in an anomalous manner. While most substances expand when heated and contract when cooled, water begins to expand at 4°C.

As a result of this, solid water is less dense than liquid water because it has more volume than liquid water.

Since solid water has more volume compared to liquid water, the pipes may no longer be able to contain the expanding water which has turned to ice leading to the bursting of the water pipes.

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2.72 moles of HF are needed to react with 0.340 mol of Na₂SiO₃ based on the balanced chemical equation.

To determine how many moles of HF are needed to react with 0.340 mol of Na₂SiO₃, we need to look at the balanced chemical equation:

Na₂SiO₃(s) + 8 HF(aq) -> H₂SiF₆(aq) + 2 NaF(aq) + 3 H₂O(l)

The balanced equation shows that 1 mole of Na₂SiO₃ reacts with 8 moles of HF. Therefore, to find the moles of HF needed for 0.340 mol of Na₂SiO₃, we use the ratio:

(0.340 mol Na₂SiO₃) * (8 mol HF / 1 mol Na₂SiO₃) = 2.72 mol HF

Therefore, 2.72 moles of HF are needed to react with 0.340 mol of Na₂SiO₃.

We balance the given redox reaction using the half-reaction method. First, we write the half-reactions, balance atoms other than H and O, balance O by adding H2O, balance H by adding H+ ions, and ensure electrical neutrality by adding electrons. The result is the balanced reaction: 2Ag + clo2- + 2H2O → 2Ag + clo4- + 4H+.

The task is to balance a redox reaction wherein clo2– is oxidized to clo4– and Ag is reduced to Ag in an acidic solution. We do this by employing a method known as the half-reaction method which involves the following steps:

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A periodic trend on the periodic table is represented by a repeating pattern