50 points Use the drop-down menus to select the names of the labeled structures.
A:
B:
C:
D:

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the change in Gibbs energy is 5.2 J/mol, and the reaction is non-spontaneous under these conditions.

To calculate the change in Gibbs energy, we can use the equation:

ΔG = ΔH - TΔS

ΔH - change in enthalpy,

ΔS - change in entropy,

T - temperature in Kelvin.

at 188 K, ΔH = 2380 J/mol and ΔS = 12.6 J/mol K

ΔG = (2380 J/mol) - (188 K)(12.6 J/mol K)

ΔG = 2380 J/mol - 2374.8 J/mol

ΔG = 5.2 J/mol

The positive value of ΔG indicates that the reactants are more stable than the products and that energy must be added to the system to drive the reaction forward.

Therefore, the change in Gibbs energy is 5.2 J/mol, and the reaction is non-spontaneous under these conditions.

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Answer:

A.

Explanation:

Matter is neither created nor destroyed unless it is acted upon by a chemical force/change.

CuSO4 is soluble in water but ferric oxide is not soluble in water.

Ferric oxide is an insoluble oxide hence it does not dissolve in water. Since the substance is insoluble in water, it exists as solid particles when added to water. When this mixture is filtered,  ferric oxide is separated from water.

On the other hand, copper (II) sulfate is quite soluble in water hence it can not be separated from water by filtration since it dissolves completely in water. Hence, copper (II) sulfate can not be separated from water by filtration but ferric oxide can be separated from water by filtration.

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The molecular shape of a molecule is determined by the number of bonding and non-bonding electron pairs around the central atom. Without knowing the specific molecule, we cannot provide a direct answer to its molecular shape.

In order to determine the molecular shape of a molecule, we need to know the number of bonding and non-bonding electron pairs around the central atom. This can be done using the VSEPR theory.

The molecule in question is not specified, so we cannot provide a specific answer. However, I can explain the general process of determining molecular shape.

First, we need to draw the Lewis structure of the molecule, which shows the arrangement of atoms and the bonding and non-bonding electron pairs. Then, we count the number of bonding and non-bonding electron pairs around the central atom.

Based on the number of electron pairs, we can determine the molecular shape using the VSEPR theory. For example, if there are two bonding electron pairs and no non-bonding electron pairs, the molecular shape would be linear. If there are three bonding electron pairs and one non-bonding electron pair, the molecular shape would be trigonal pyramidal.

Without knowing the specific molecule, we cannot provide a direct answer to the molecular shape. It would be helpful to provide the specific molecule in order to determine its molecular shape.

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The molecule SF6 has a central sulfur atom (S) bonded to six fluorine atoms (F). To determine its molecular shape, we can use the valence shell electron pair repulsion (VSEPR) theory.

In SF6, the sulfur atom has six valence electrons, and each fluorine atom contributes one valence electron, giving a total of 48 valence electrons (6 electrons from sulfur and 6 electrons from each of the 6 fluorine atoms).

Based on VSEPR theory, the six electron pairs (lone pairs and bonding pairs) around the sulfur atom will arrange themselves to minimize repulsion and achieve maximum stability. Since there are no lone pairs on the sulfur atom in SF6, all six positions around sulfur are occupied by fluorine atoms.

As a result, the molecule SF6 adopts an octahedral molecular geometry. The six fluorine atoms are arranged symmetrically around the central sulfur atom, with the sulfur-fluorine bonds extending along the six edges of an octahedron. This means that the angle between any two adjacent fluorine atoms is 90 degrees, and all fluorine atoms are equidistant from the sulfur atom.

So, to summarize, the molecular shape of SF6 is octahedral, with the sulfur atom at the center and six fluorine atoms surrounding it in a symmetrical arrangement.

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Answer:

increase

Explanation:

1m = 100cm

3m = 300m

300> 3

During the experiment determining the activation energy, the decomposition of an iron (III) phenanthroline complex ion will be monitored at different temperatures.

Activation energy refers to the energy required for a chemical reaction to take place. The decomposition of the iron (III) phenanthroline complex ion involves breaking apart the complex into its individual components. By monitoring the rate of decomposition at different temperatures, the activation energy of the reaction can be determined. This information can be useful in understanding how the reaction proceeds and in optimising reaction conditions for a desired outcome.

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An amide that has a molecular ion with an m/z value of 129.

The molecular formula is C₉H₁₃NO.

To determine the molecular formula of the amide with an m/z value of 129, we need to consider the possible combinations of carbon (C), hydrogen (H), nitrogen (N), and oxygen (O) that would yield that molecular mass.

The m/z value of 129 indicates the mass-to-charge ratio of the molecular ion. Since we're dealing with a neutral molecule, we can assume a charge of +1 for the molecular ion. Therefore, the molecular mass would be equal to 129.

To find the molecular formula, we can consider different combinations of elements that sum up to a molecular mass of 129. Here are a few possibilities:

1. C₈H₁₁NO: In this case, the sum of the atomic masses is (8 × 12.01) + (11 × 1.01) + 14.01 + 16.00 = 128.09, which is close to the desired molecular mass but not exactly 129.

2. C₈H₁₀N₂O: In this case, the sum of the atomic masses is (8 × 12.01) + (10 × 1.01) + (2 × 14.01) + 16.00 = 128.14, which is also close to 129 but not exact.

3. C₉H₁₃NO: In this case, the sum of the atomic masses is (9 × 12.01) + (13 × 1.01) + 14.01 + 16.00 = 129.12, which is very close to 129.

Therefore, the molecular formula that best fits the given m/z value of 129 is C₉H₁₃NO.

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The true statement about mixtures is that they do not have specific compositions (option B).

Mixture is a substance made up of two or more chemical components that are not chemically linked.

This further means that the constituents of a mixture maintain or keep their individual chemical identities because there is no breaking of bonds.

As opposed to mixtures, compounds are made up of constituents that are chemically bonded to one another, hence, possess a definite composition.

Examples of mixtures are as follows:

Therefore, the true statement about mixtures is that they do not have specific compositions.

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Answer:

false, The nucleus of atoms still move around like crazy, it's just the electrons move more.

We are able to determine a molecule's shape using the VSEPR theory.

The VSEPR theory assumes that the molecular shape minimizes these repulsions and that all electron pairs, including bonding pairs and lone pairs, repel one another, particularly when they are close to one another.

The molecule's geometry can be determined with the help of VSEPR theory. As indicated by the VSEPR hypothesis, the electrons repulse each other and will, consequently, take on a game plan that limits this repugnance. When the electron pairs or groups of electron pairs are as far apart as possible, repulsions are at their lowest.

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The average atomic mass of this element with three isotopes is 36.33 amu.

Isotopes are defined as substances having same number of protons but different number of neutrons.Number of protons is characteristic for determining position of elements in the periodic table.

Since,all isotopes have the same number of protons and hence have same position.They have similar chemical properties as they have same number of electrons.

They find applications in the field of nuclear medicine and oil and gas research . There are 2 types of isotopes : stable and unstable.

Average atomic mass of 3 isotopes is 35+36+38/3=36.33 amu.

Thus,the  average atomic mass of this element with three isotopes is 36.33 amu.

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The common mode of action based on the principle of like-dissolves-like and the concept of solvent-solute interactions is called solvation.

Solute-solvent interactions are described as the intermolecular attractions between a solute particle and a solvent particle.

So in the case that If the intermolecular attractions between solute particles are different compared to the intermolecular attractions between solvent particles it is unlikely dissolution will occur.

An example of  Solute-solvent interactions is when you add salt to water the salt dissolves and distributes uniformly within the water. There is more water than salt. So then we know that water is the solvent.

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The oxidation number of the designated element in each compound is:

C in COCl₂: +2 for carbon

Br in HBrO: +1 for bromine

C in C₂O₄²⁻: +3 for carbon

H in CaH₂: -1 for hydrogen

N in N₂H₄: -2 for nitrogen

Cr in Cr₂O₇²⁻: +6 for chromium

O in Na₂O₂: -1 for oxygen

N in NaN₃: -3 for nitrogen

Oxidation numbers are assigned to each element in a compound to indicate the general distribution of electrons among the atoms in the compound. The oxidation number of an element is the charge that it would have if all of its bonds were ionic.

The oxidation number of an element can be calculated by assigning the electrons in the bond to the more electronegative atom and then calculating the charge that the atom would have if it had gained or lost electrons to achieve a noble gas configuration.

The complete question is

What is the oxidation number of the designated element?.

C in COCl₂? Br in HBrO? C in C₂O₄²⁻? H in CaH₂? N in N₂H₄? Cr in Cr₂O₇²⁻? O in Na₂O₂? N in NaN₃?

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Answer:

iron(lll)oxide

Explanation:

has three oxygen atoms

The correct formula for the compound is iron(III) oxide with two iron atoms and three oxygen atoms. Therefore, option (3) is correct.

Fe₂O₃ is an inorganic compound that has the chemical name Iron(III) oxide. Iron(III) oxide is also known as Hematite or Red iron oxide. This compound is naturally found in rocks of all ages. It is odorless, appears as a Red-brown solid, and has a pH value of 7.

Iron (III) oxide also called ferric oxide, is formed by the oxidation of iron. This can be prepared by electrolyzing a sodium bicarbonate solution in the laboratory, with an iron anode. The hydrated iron(III) oxide obtained which is dehydrated at around 200 °C.

The oxidation state of iron can be calculated as oxygen has an oxidation number of -2.

2x + 3(-2) = 0

2x = 6

x = +3

Therefore, the chemical formula Fe₂O₃ has the name Iron(III) oxide.

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Its Iron and Potassium because if you look at the periodic table,and you go down the list of metals, you can see what metals are there.

The change in entropy is approximately 17 J/K. Therefore, option a) 17 J/K is the correct answer.

To determine the change in entropy, we need to use the equation:

ΔS = Q/T

where ΔS is the change in entropy, Q is the heat energy added, and T is the temperature in Kelvin.

In this case, we have the following information:

Heat energy (Q) = 6.78 x 10³ J

Temperature (T) = 100°C = 100 + 273.15 K (converting to Kelvin)

Plugging these values into the equation, we can calculate the change in entropy (ΔS):

ΔS = (6.78 x 10³ J) / (100 + 273.15 K)

Calculating this value:

ΔS ≈ 17 J/K

Therefore, the change in entropy is approximately 17 J/K. Therefore, option a) 17 J/K is the correct answer.

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The loss of mass in a nuclear reaction is due to the conversion of some of the mass into energy, as described by Einstein's famous equation, E=mc^2. This equation states that energy (E) and mass (m) are interchangeable, and the conversion of mass into energy releases a tremendous amount of energy.

In a nuclear reaction, the nuclei of atoms are transformed into different nuclei, releasing or absorbing energy. This energy is in the form of gamma radiation, which carries away some of the mass of the system in the form of energy. The loss of mass, also known as mass defect, is the difference between the actual mass of an atomic nucleus and its expected mass based on the individual masses of its constituent protons and neutrons.

This mass defect is the result of the strong nuclear force that holds the nucleus together, and it is this energy that is released during a nuclear reaction. The energy released during a nuclear reaction can be harnessed to generate electricity in nuclear power plants, or to propel a rocket in a nuclear weapon.

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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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Catalysts, such as the minerals deposited on hydrothermal vent walls, bring reactants together and increase the speed of the reactions without providing energy.

We can define catalysts as substances that increase the speed of a reaction. The catalysts themselves remain unchanged in a chemical reaction and work by lowering the temperature, pressure and energy levels.

Without a catalyst, a chemical reaction will take a long time to occur.

The rate of a reaction increases using a catalyst for the reaction. Some of the minerals that act as catalyst in hydrothermal vents are iron, nickel and sulfide minerals.

The oxides of most metals acts as catalysts. Inside the body of organisms, enzymes act as biological catalysts.

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The average molecular velocity can be defined as follows:

Where,

R is a constant

T is the temperature

M is the molar mass

If we assume that the temperature is the same for all gases, the velocity will vary according to its molar mass. We see that the molar mass is inversely proportional to the speed, the greater the mass of the gas, the slower it will move. Therefore we are going to determine the molar mass of the gases:

Therefore, the order according to the average velocity will go. We must organize from the largest molar mass to the smallest molar mass.

BrF

The answer will be 6. Option

This law states that matter can neither be created nor destroyed in an ordinary chemical reaction, but can change from one form to another.

What this implies is that when two elements or compound combine as a reactant to form a product, there's no loss of matter and the mass of the reactants must be equal to the mass of the product.

Given that

AlBr₃ + K₂SO₄ → KBr + Al₂(SO₄)₃

If we look closely at the above reaction, we would see that aluminuim is not balanced, potassium is also not balanced, bromine is not balance as well as sulphur and oxygen.

Let's put two moles attached to the AlBr₂ and three moles of K₂SO₄

2AlBr₃ + 3K₂SO₄ →

This would give us

6KBr + Al₂(SO₄)₃

If we add the two equations together,

2AlBr₃ + 3K₂SO₄ → 6KBr + Al₂(SO₄)₃

From the above, we have

2 atoms of Al on the reactant side and 2 atoms of Al on the product side

6 atoms of Br on the reactant side and 6 atoms of Br on the product side

6 atoms of K on the reactant side and 6 atoms of K on the product side

3 atoms of S on the reactant side and 3 atoms of S on the product side

12 atoms of O on the reactant side and 12 atoms of O on the product side

Answer:

I could be wrong but I believe it's 99.9

Answer:

umm well when a reaction happens it's chemical and when you put like salt and pepper or cookies and crackers its physical

Explanation:

A pharmacy technician performs all the following duties except answering phones and data entry. Option (d) is the correct answer

Pharmacy technicians work with a pharmacist in order to ensure the safety and health of the patients. Their duties involve locating, dispensing , packing , and labelling a prescribed medication for the patient which is further reviewed by a pharmacist to check accuracy before dispensing it  to the patient. They also help the pharmacists with taks related to administration. Some of their major roles and responsibilities include: Packaging and labeling of the prescribed medications, Preparation of compounded medications by using sterile as well as non-sterile processes, Processing of insurance claims, Tracking inventory, Operating automated machines for  dispensing, Repackaging bulk medications , Dispensing of medication to the patients acccording to the prescription.

Therefore, option (d) is correct.

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ANSWER

The arrow will be shifted to the right (OPTION B)

EXPLANATION:

Firstly, we need to write out the chemical reaction equation

From the reaction above, you will see that heat is one of the products, this means that the reaction is n exothermic reaction.

An exothermic reaction is a type of reaction in which heat is released to its surroundings.

In an exothermic reaction, a decrease in temperature will shift the equilibrium to the right

Answer:

Its 2 and 3

Explanation:

The mass of nitric oxide produced by the reaction of 2.81 grams of ammonia is 1.59 grams.

The equation for the reaction of ammonia and oxygen to produce Nitric oxide and water is,

4NH₃ + 5O₂ → 4NO + 6H₂O

From the reaction we can see,

4 moles of ammonia = 4 moles of nitrix oxide.

Mole of ammonia = moles of nitric oxide.

Moles = reacted/formed mass/ molar mass

Molar mass of ammonia = 17 g/mol.

Molar mass of nitric oxide = 30 g/mol.

Mass of ammonia reacted = 2.81 grams.

Putting values,

2.81 x 17 = Formed mass of nitric oxide x 30

Formed mass of nitric oxide  = 1.59grams.

The mass of nitric oxide formed is 1.59 grams.

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Answer:

chemical, is the answer your looking for

Answer:

Radium Nitride

A radioactive element is radium. See what "radioactive" actually means.

Atoms make up the elements. Since most atoms are stable, they do not change over time. However, some of the heaviest atoms disintegrate and transform into different types. "Radioactivity" is the term for this breakdown or disintegration.

Each radioactive element releases rays that decay or disintegrate at a specific pace. There is no known way to speed up or slow this rate. Some changes happen quickly, some take longer, but no matter what, man cannot control the action.

In the case of radium, this decay would continue indefinitely until the radioactive material was ultimately converted to lead. For instance, in 1,590 years, half a gram of radium would transform into atoms with a lower atomic weight. Half of the remaining radium would transform after an additional 1,590 years, and so on until all of it turned into lead.

Attachment #1:

This is a revigator. It is a pot that was created specifically with radium, uranium, and other radioactive materials to contain water. When radioactivity was first discovered in 1912, people thought it was beneficial and "magical," similar to how homeopathic treatments are now. They would store water in it to allow it to absorb radiation, then they would drink the water. In the 1930s, several gadgets were subsequently recalled.

The enigmatic new radioactive elements captivated people's curiosity during the early 1900s. Although this starch didn't actually contain radium, it was given that name because of the rarity and beauty of radium. It was once thought of similarly to how titanium is now.

Madame Curie and her husband, Pierre Curie, made the discovery of radium. They were processing a ton of pitchblende, an ore that contains uranium. Although they were aware that the uranium was emitting invisible rays, they had the impression that there was another another, far more potent chemical present. They initially discovered polonium, another radioactive element, before successfully isolating a minute particle of radium.

The three types of rays that radium emits are alpha, beta, and gamma rays. Helium gas contains swiftly moving particles called alpha rays. In beta rays, the electrons move quickly. Gamma rays are similar to X-rays but typically more invasive. Every time one of these rays is emitted, its parent atom transforms into a different element. "Atomic transmutation" is the term for this transformation.

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>> ROR

There are two types of substances, they are combustible and non-combustible substances. Those substances which undergo combustion are defined as the combustible substances. Here the mass of ethanol is 3832.26 g.

The process in which a substance burns in the presence of oxygen to produce heat and light can be defined as the combustion. The products of the combustion reaction are carbon-dioxide and water.

The combustion of ethanol is:

C₂H₅OH  +  3O₂  →  2CO₂  +  3H₂O

1 mol of ethanol, you can make 3 mole of water.

Moles of water = mass / Molar mass = 500.0 / 18 = 27.77

27.77 mole came from 27.77 × 3 / 1 = 83.31 mole of ethanol

Molar mass ethanol = 46 g/mol

Mass =  83.31 ×  46 = 3832.26 g

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