(a) Make a model of 2,3,4-trimethylpentane. Consider the bond along C2-C3. Draw Newman projections for the six conformations corresponding to energy maxima and minima. (b) State and explain which conformation is the most stable and which is the least stable. (c) Label each conformation with the appropriate term(s): staggered, eclipsed, anti, gauche. (d) Starting with the least stable conformer, sketch the energy profile to illustrate the relative stability of the different conformers of 2,3,4- trimethylpentane when rotated along C2-C3.

Answer:

Explanation: The S^2+ ion would contain a smaller atomic radius when compared to the atomic radius of S. With the removal of electrons, the outermost electrons experience less shielding, and thus experience a greater columbic force, and effective nuclear charge. Pulling in the outside electrons closer to the nucleus, consequently shrinking the atomic radius.

Answer:

C

Explanation:

Answer: they don't have values there because they aren't on the pauling scale of electronegativity, as they don't form any compounds with other elements. However, argon and neon can technically form compounds with other elements; it is just extremely unlikely.

Explanation:

The condensed general formula for alcohols is R-OH. Alcohols are organic compounds that contain a hydroxyl (-OH) group attached to a carbon atom. The general formula for alcohols is R-OH, where R represents the alkyl group. Alkyl groups are groups of atoms that are derived from alkanes by removing one hydrogen atom. Therefore, alcohols can be described as organic compounds that have an alkyl group attached to a hydroxyl group.

To differentiate between alcohols and other organic compounds, it is important to know their unique properties. Alcohols have a characteristic odor, are soluble in water, and have a higher boiling point compared to hydrocarbons. They can also undergo various chemical reactions, such as oxidation and dehydration, to form different organic compounds.

In summary, the condensed general formula for alcohols is R-OH, which represents an organic compound with an alkyl group attached to a hydroxyl group.

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Answer:

Because it was not based on evidence and experiment.

Alchemy isn’t rigorous enough.

People began to realize that it was possible to transform one material into another in antiquity. The study of how to achieve this was known as alchemy. Alchemists would experiment on various substances, trying to turn lead into gold or to create the elixir of life.

They were unaware of what was taking place in the background, though. They weren't as rigorous as contemporary science. seldom ever exchanged their discoveries. And technically speaking, they carried out their experiments before the formalization of the scientific process.

In a way that made perfect sense to the alchemists but makes no sense at all to us, alchemy blurs the lines between empirical observation and experimentation, irrational conjecture, and mysticism. The last two render it unscientific.

Alchemy became known as chemistry once the scientific approach was established and mysticism was eliminated. Because alchemy particularly refers to the earlier, less scientific kind of chemistry, we no longer view it as a science.

The density of strontium in kilograms per cubic meter if a 4.00 kg sample has a volume of 0.00152.m³ is calculated as 2631.57 kg/ m³.

Density is generally defined as the mass of material per unit volume. Density is an important concept as it allows us to determine what substances will float and what will sink when placed in a liquid. Generally, substances float as long as their density is less than density of the liquid they are placed in.

Given, mass = 4kg and volume = 0.00152.m³

So, Density of strontium = 4kg/0.00152m³

Density of strontium = 2631.57 kg/ m³

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Answer:  1.8x10^-4 M H+

Explanation:  The number of moles of NaOH added to the 100 ml soultion will be equal to the number of moles of H+ present in that solution.  

Moles NaOH in 7.2 ml of 2.5x10^-3 M NaOH

(2.5x10^-3 M NaOH) is the same as 2.5x10^-3 moles NaOH/liter

(2.5x10^-3 moles NaOH/liter)*(7.2 ml)*(1 liter/1000ml) = 1.8x10^-4 moles NaOH used to titrate 100 ml of the acid.  That means there was 1.8x10^-4 moles of H^+ in 100 ml.  

Concentration of H^+ = (1.8x10^-4 moles H)/0.100 l) = 1.8x10^-4 M H+

(pH of 3.74)

The pH of the 0.203 M HNO₃(aq) solution is approximately 0.693, indicating a highly acidic solution.

So, the correct answer is A.

To calculate the pH of a 0.203 M HNO₃(aq) solution, you need to understand that HNO₃ is a strong acid that completely dissociates in water.

The dissociation equation for HNO₃ is: HNO₃(aq) → H⁺(aq) + NO₃⁻(aq)

Since HNO₃ completely dissociates, the concentration of H⁺ ions will be equal to the concentration of HNO₃, which is 0.203 M.

The pH is calculated using the formula:

pH = -log₁₀[H⁺]

Plugging in the H⁺ concentration:

pH = -log₁₀(0.203) ≈ 0.693

Therefore, the correct answer is A) 0.693.

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All the magnesium do not  reacted and  some of the product was magnesium nitrite, Mg₃N₂ are the factors . Option B is correct.

The empirical formula, which is defined as the ratio of subscripts of the smallest possible whole number of the elements in the formula, is the simplest formula for a compound.

                                 Mg + O₂( air) ⇒ MgO.

assume  mass of magnesium [Mg]= w₁ g

mass of the product [MgO] = w₂ g

Thus, mass of oxygen in MgO = w₂-w₁

                                               = x g

Now, to explain the experimental result, which indicates a higher Mg to oxygen ratio rather than a 1:1 ratio, this x g is less than w₁ g.

i) x< w₁ If all of the w₁  is not reacted, less w₂ is formed, and the ratio will be greater than 1:1.

ii) If a side effect occurs and some magnesium nitride is heated in the air, [Mg₃N₂] also formed.

                                 Mg + N₂( air)  ⇒ Mg₃N₂ ,

Because it contains both the product MgO and Mg₃N₂, x g will yield a higher Mg ratio.

iii) Option II is incorrect because both MgO and Mg₃N₂ are white amorphous solids that are stale and inert. So it can't be evaded during assortment.

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Complete question as follows:

A student determined the empirical formula of magnesium oxide by heating a known mass of magnesium in air and weighing the product after the magnesium had burned. Which factors would result in her calculated formula having a higher ratio of magnesium to oxygen than 1:1? I 1. Not all the magnesium reacted II. Some of the product escaped before it was weighed III. Some of the product was magnesium nitrite, Mg, N,

A. I and II only

B. I and Ill only

C. Il and Ill only

D. I, II and III

The four elements that comprise approximately 96% of our body weight are carbon, oxygen, hydrogen, and nitrogen.

The mass of our bodies is composed almost entirely of carbon, hydrogen, oxygen, and nitrogen. The remaining four percent of a person's body weight is almost entirely made up of the elements sodium, potassium, magnesium, calcium, iron, phosphorus, sulfur, chlorine, and iodine.

To all intents and purposes, the human body is a phenomenally complicated piece of machinery. This demands a wide variety of components, all of which must cooperate with one another in intricately intertwined connections, on scales ranging from the micromolecular to the macromolecular.

The amount of chemical elements and how they interact with one another is what determines the structure of the building blocks that make up the sum of these parts, such as proteins and nucleic acids.

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Yes, Over the past 15 years, high entropy alloys (HEAs) have become increasingly popular as a new paradigm in materials science. First 3-D-revealed excessive-overall performance Nanostructured Alloy.

A crew modern day scientists have 3-D published a dual-phase, nanostructured excessive-entropy alloy that exceeds the power and ductility modern other additively synthetic materials. This breakthrough should result in better-performance additives for applications in aerospace, medicinal drug, power, and transportation.

Excessive entropy alloys (HEAs) have become cutting-edge famous as a brand new paradigm in substances technology over the past 15 years. they're constituted of five or extra factors in close to-identical proportions and provide the ability to create a near-infinite number modern-day unique mixtures for alloy design. conventional alloys, along with brass, chrome steel, carbon steel, and bronze, incorporate a number one element mixed with one or extra hint elements.

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Answer:

+5

Explanation:

hope this helps! :)

Answer:

C: the repulsion of electrons and electrons.

Explanation:

According to the VSEPR theory, molecular shapes adjust so that the electrons can be as far apart as possible due to electrons repelling each other, which would mean the only possible answer is C.

Answer:

Yes ionic bonds do dissolve in water

Explanation:

Water is a polar solvent and has two poles one negative and another positive. The two poles of water have strong forces of attraction towards other charged ions, due to this water breaks the ionic bond by hydrogen bond formation. Therefore, ionic bonds dissolve in water.

hope this helps

Answer:

The reaction absorbs energy ( + or exothermic)

Explanation:

When the temperature of a thermometer increases during a chemical reaction, then the reaction absorbs energy (+ or endothermic). Therefore, the correct option is B.

A rise in the temperature of a thermometer during a chemical reaction is a sign that the system is absorbing energy. This implies that the reaction is endothermic, meaning that energy must be supplied for it to proceed. Generally, endothermic reactions take heat from the environment and raise the temperature. Chemical bonds are broken and the process is accelerated by the absorbed energy.

Therefore, the correct option is B.

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The Roman numeral in the manganese (IV) sulfide indicates : the positive charge on the manganese ion. The correct option is B.

The Manganese (IV) sulfide, chemical formula = Mn₂S₄ In the compound Manganese (IV) sulfide, the manganese (IV) contains the positively charged cation and the sulfide contains the negatively charged anion. The name of the manganese (IV) sulfide is that each of the manganese atom has the charge of +4.

Manganese = Mn⁴⁺

Sulfide = S²⁻

The chemical formula for the Manganese (IV) sulfide = Mn₂S₄. The  Roman numeral in manganese (IV) sulfide shows the positive charge on the manganese ion.

Therefore, the correct option is B.

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The option that is not a known advantage of natural gas over other fossil fuels is: C. It is far more abundant than any other fossil fuel.

Natural gas has several advantages over other fossil fuels. Firstly, it burns more completely than other fossil fuels, which means it produces fewer pollutants and greenhouse gases.

This leads to the second advantage, as natural gas burns more cleanly than other fossil fuels, resulting in reduced emissions of pollutants such as sulfur dioxide, nitrogen oxides, and particulate matter.

However, when it comes to abundance, natural gas is not necessarily more abundant than other fossil fuels.

While natural gas reserves can be substantial, the availability and reserves of other fossil fuels like coal and oil are also significant. Therefore, option C is not a known advantage of natural gas over other fossil fuels.

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Only options A. I and II are correct.

A molecule or an atom that has an unpaired electron in the outer shell is referred to as a free radical. Due to its need to couple up its unpaired electron with another electron from a nearby molecule, this makes it extremely reactive and unstable. A covalent bond can split evenly into two free radicals through a process known as homolytic fission, in which each atom receives one of the shared electrons. Two free radicals are produced by this procedure. However, contrary to what statement I implied, free radicals do not possess a single pair of electrons. Additionally, as indicated in paragraph III, they are not charged.

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Answer:

They both go backward because of force.

Explanation:

The logic behind this answer is that child right and pushes away causing her to go backward meaning her partner is being pushed backwards to.

(Hope this was helpful!)

In summary, the order of expected Imax in the U.V.-visible spectrum for these molecules is 1,5-diphenyl-1,4-pentadien-3-one > 1-phenyl-1-buten-3-one > Benzaldehyde.

The expected Imax in the U.V.-visible spectrum for a molecule is directly related to the number of conjugated pi bonds present in the molecule. The more conjugated pi bonds, the higher the Imax. Based on this, we can rank the molecules in order of expected Imax as follows:

1) 1,5-diphenyl-1,4-pentadien-3-one - This molecule has a total of 6 conjugated pi bonds, which is the maximum possible for the given structure. Therefore, it is expected to have the highest Imax.

2) 1-phenyl-1-buten-3-one - This molecule has 3 conjugated pi bonds, which is less than the previous molecule but still a significant number. It is expected to have a moderate Imax.

3) Benzaldehyde - This molecule has only 1 conjugated pi bond, which is significantly less than the other two molecules. Therefore, it is expected to have the lowest Imax.

In summary, the order of expected Imax in the U.V.-visible spectrum for these molecules is 1,5-diphenyl-1,4-pentadien-3-one > 1-phenyl-1-buten-3-one > Benzaldehyde.

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Answer:

A substance whose molecules do not take up space or interact with one another

A substance whose molecules do not take up space or interact with one another, hence option A is correct.

Molecules are defined as the lowest fundamental unit of a chemical molecule that can participate in a chemical reaction is a group of bound atoms. The smallest identifiable unit into which a pure substance may be divided while retaining its composition and chemical properties is a molecule, which is a collection of two or more atoms.

A theoretical gas known as an ideal gas is made up of several randomly moving point particles with no interparticle interactions. Because it abides by the ideal gas law, a condensed equation of state, and is amenable to statistical mechanics analysis, the ideal gas concept is helpful. The relationship between pressure and volume in an ideal gas is described by the Ideal Gas Law.

Thus, a substance whose molecules do not take up space or interact with one another, hence option A is correct.

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Answer:

Mendeleev’s periodic table is, based on the relation of elements’ properties as dependent on the atomic weight of the element. But the Modern periodic table considers atomic number as the fundamental property that decides the properties of elements.

The modern periodic table does correct the defects of Mendeleev’s periodic table. For example, in Mendeleev’s periodic table, in the element pairs, Argon-potassium, cobalt-nickel, tellurium-iodine and thorium and protactinium, elements with higher atomic mass precede the element with lower atomic weight. However, it is the right places for them but is against Mendeleev’s periodic law.

These elements atomic number shows the reverse order compared to atomic mass. The supposed to be wrong positions in Mendeleev’s table has the right explanation justifying their positions.

Therefore, the volume of the gas at 4.00oc and 108.7kpa is 583 ml.

To solve this problem, we need to use the combined gas law, which relates the volume, pressure, and temperature of a gas. The formula for the combined gas law is:
(P1 x V1) / (T1) = (P2 x V2) / (T2)
Where P1, V1, and T1 are the initial pressure, volume, and temperature, respectively, and P2, V2, and T2 are the final pressure, volume, and temperature, respectively.
We can plug in the given values into the formula and solve for V2:
(P1 x V1) / (T1) = (P2 x V2) / (T2)
(65.3 kpa x 654 ml) / (6.00oc + 273.15) = (108.7 kpa x V2) / (4.00oc + 273.15)
Simplifying the equation, we get:
V2 = (65.3 kpa x 654 ml x (4.00oc + 273.15)) / (6.00oc + 273.15) / (108.7 kpa)
V2 = 583 ml

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The concentration of acetic acid in the original vinegar solution is 0.0435M.

Balanced chemical equation for the reaction between acetic acid (CH₃COOH) and sodium hydroxide (NaOH) is:

CH₃COOH + NaOH → CH₃COONa + H₂O

The number of moles of NaOH used in the titration will be calculated as;

moles NaOH = Molarity × Volume (in L)

moles NaOH = 0.1073 M × 0.02024 L

moles NaOH = 0.002174872

Therefore, the concentration of CH₃COOH in the diluted vinegar solution is;

C₁V₁ = C₂V₂

C₁ × 10.00 mL = C₂ × 50.00 mL

C₁ = (C₂ × 50.00 mL) ÷ 10.00 mL

C₁ = 5 × C₂

where C₁ is the concentration of CH₃COOH in the diluted vinegar solution, and C₂ is the concentration of CH₃COOH in the original vinegar solution.

The number of moles of CH₃COOH in the diluted vinegar solution is;

moles CH₃COOH = C₁ × V₁ (in L)

moles CH₃COOH = (5 × C₂) × 0.01000 L

moles CH₃COOH = 0.05000 × C₂

The concentration of CH₃COOH in the original vinegar solution can be calculated;

moles CH₃COOH in original vinegar = moles CH₃COOH in diluted vinegar

0.05000 × C₂ = 0.002174872

C₂ = 0.002174872 ÷ 0.05000

C₂ = 0.043

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Answer:

Metallic bonding may be described as the sharing of free electrons among a lattice of positively charged metal ions. The structure of metallic bonds is very different from that of covalent and ionic bonds. ... In metallic bonds, the valence electrons from the s and p orbitals of the interacting metal atoms delocalize.

Answer:

b. They do not move through the rock cycle at the same rate

Explanation:

The rock cycle is the phenomenon used to describe the interrelation of the three forms in which rocks exists, and a rock is changed between forms due to the Earth's geologic process, such as erosion, weathering and plate tectonics

The rock cycle involves both chemical and physical transformation of rocks and therefore, the atoms and compounds make and cut connections, such that the rate at which each atom move through the rock cycle at different rate

Answer:

37.7%

Explanation:

58% of 65 is 37.7%

Answer:

One word for this is, raconteur - it means a person skilled in telling anecdotes. anecdotist. narrator,  or storyteller

Explanation: