A construction firm in Fairbanks, Alaska and in Phoenix, Arizona is designing a series of apartment
complexes to be built this next year and they want to make the units as energy efficient as possible.
Describe what the firm would need to take into consideration to make this possible. Give as much detail
in your description as possible. Use academic language and supporting evidence from your notes and
from the lessons in this unit.

Molecular Orbital Theory addresses which of the following properties of molecules the correct answer in option A) polarity spectral, magnetic, and resonance.

Molecular Orbital Theory addresses the following properties of molecules: Polarity: Molecular Orbital Theory helps in determining the polarity of molecules by considering the distribution of electrons in the molecular orbitals. The overlapping of atomic orbitals and the formation of molecular orbitals can lead to either polar or nonpolar molecules, depending on the electron distribution. Spectral, magnetic, and resonance properties: Molecular Orbital Theory provides insights into the electronic structure of molecules, which are directly related to their spectral and magnetic properties. By analyzing the molecular orbitals, one can understand the energy levels and transitions that give rise to specific absorption or emission spectra. Additionally, the distribution of electrons in molecular orbitals affects the resonance behavior of molecules. Hybridization of valence-shell atomic orbitals: Molecular Orbital Theory explains the concept of hybridization, which occurs when atomic orbitals mix to form hybrid orbitals. Hybridization helps in understanding the geometry and bonding in molecules, particularly in cases where the observed geometry cannot be explained by considering only the individual atomic orbitals. Geometry and valence-shell repulsion: While Molecular Orbital Theory primarily focuses on the electronic structure of molecules, it indirectly addresses the molecular geometry and valence-shell repulsion. The distribution of electrons in molecular orbitals influences the arrangement of atoms and the resulting molecular geometry due to the repulsion between electron pairs.

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Answer:

180°

Explanation:

You are starting at 125° W and ending at 55° E.

It might be easier to find the distance travelled by using a number line.

Numbers west are negative and numbers east are positive.

Start at -125 and go in jumps of 10 until you reach +55.

You make 18 jumps of 10° each for a total of 180°.

You have travelled a distance of 180°.

What you have just done is equivalent to saying:

distance travelled = end - start = 55° - (-125°) = 55° + 125° = 180°  

Answer:

Fossil fuels, such as coal, oil, or natural gas, release carbon back into the atmosphere.

The processes would be decomposition, diffusion, erosion, respiration, and combustion.

Explanation:

Hope this helped?

Answer:

1.138158E24 atoms or 1.14 x 10^24 atoms

Explanation:

To find atoms/particles from moles you just want to convert using avogadro's number which is 6.022 x 10^23

1.89 mol x 6.022 • 10^23

———— = 1.138158E24 atoms

1 mol

so 1.138158E24 atoms or 1.14 x 10^24 for scientific notation

hope this helps :)

The isotope symbol that fits each description is as follows: 68 neutrons, 47 electrons is Ag b. mass number = 197, 79 electrons is Au c. atomic number = 86, 136 neutrons is Rn d. atomic number = 76, mass number = 192 is Os.

Isotopes are two or more atom types that share the same atomic number (number of protons in their nuclei), location in the periodic table, and chemical element but have distinct nucleon numbers (mass numbers) as a result of having a different number of neutrons in their nuclei. Although the chemical properties of each isotope of a given element are nearly identical, they differ in their atomic weights and physical characteristics.

The name "isotope" refers to the fact that different isotopes of the same element occupy the same location on the periodic table. The word "isotope" is derived from Greek origins that mean "the same place".

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The science that is primarily concerned with the study of matter and the changes it undergoes is chemistry (Option B).

Chemistry is the scientific study of matter, its properties, composition, structure, behavior, and the changes that matter undergoes during reactions with other substances. In a nutshell, chemistry deals with the characteristics and behavior of atoms and molecules, as well as their transformations, energy changes, and interactions.

The study of chemical reactions and the behavior of matter in different environments is the primary focus of chemistry. Therefore, chemistry is the science that is primarily concerned with the study of matter and the changes it undergoes.

Thus, the correct option is B.

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The Earth's surface is not covered with the same materials ; however, some areas share similar materials.Several drilling sites have been dug in various regions of the planet to analyze the Earth's surface.

Each drilling site is unique, with differing characteristics and results. Despite these differences, all of the drilling sites analyzed offer scientists a more in-depth knowledge of the Earth's surface.In essence, the scientific drilling sites each had different lithologies, stratigraphies, and geologies. Each site had different types of rocks, depths, and ages, which led to varying drilling conditions, depths, and equipment used. Different types of equipment were also used to reach the depths required, which was a significant difference in each drilling site.The scientific drilling sites also had different purposes. Scientists had specific goals they wanted to achieve at each location. For example, the scientific drilling site in the Iceland region was focused on analyzing a unique layer of igneous rocks. The primary objective was to investigate the formation of the rock layer.The same materials were not found at each scientific drilling site.

Still, they had some similarities. They all provided geologists with vital information about the Earth's surface. The data provided from each drilling site was used to piece together the Earth's geologic history and how it has changed over time.

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81.3 g H₃PO₃

Math

Pre-Algebra

Order of Operations: BPEMDAS

Chemistry

Atomic Structure

Stoichiometry

Step 1: Define

[RxN - Unbalanced] PCl₃ + H₂O → HCl + H₃PO₃

↓

[RxN - Balanced] PCl₃ + 3H₂O → 3HCl + H₃PO₃

[Given] 53.6 g H₂O

[Solve] x g H₃PO₃

Step 2: Identify Conversions

[RxN] 3 mol H₂O → 1 mol H₃PO₃

[PT] Molar Mass of H - 1.01 g/mol

[PT] Molar Mass of O - 16.00 g/mol

[PT] Molar Mass of P - 30.97 g/mol

Molar Mass of H₂O - 2(1.01) + 16.00 = 18.02 g/mol

Molar Mass of H₃PO₃ - 3(1.01) + 30.97 + 3(16.00) = 82.00 g/mol

Step 3: Stoich

Step 4: Check

Follow sig fig rules and round. We are given 3 sig figs.

81.3023 g H₃PO₃ ≈ 81.3 g H₃PO₃

Answer:

Explanation:

The mass of a substance when given the density and volume can be found by using the formula

From the question

volume = 34 mL

density = 3.24 g/mL

The mass of the liquid is

mass = 3.24 × 34

We have the final answer as

Hope this helps you

The new pressure will be approximately 1.027 atm when the temperature is raised by ten degrees at the same volume.

To calculate the new pressure, we can use the combined gas law, which relates the initial and final states of gas when changes occur in temperature, pressure, and volume.

The combined gas law equation is:

(P1 × V1) / (T1) = (P2 × V2) / (T2)

Where:

P1 = initial pressure

V1 = initial volume

T1 = initial temperature

P2 = final pressure (what we want to find)

V2 = final volume (which remains the same in this case)

T2 = final temperature

Given:

P1 = 0.988 atm

V1 = 4.0 L

T1 = 28°C (converted to Kelvin: 28 + 273 = 301 K)

ΔT = 10°C (temperature increase)

V2 = 4.0 L

We want to find P2, the final pressure.

Substituting the values into the combined gas law equation:

(0.988 atm × 4.0 L) / (301 K) = (P2 × 4.0 L) / (311 K)

Simplifying the equation:

(3.952 atm·L) / (301 K) = (4.0 L × P2) / (311 K)

Cross multiplying:

(3.952 atm·L × 311 K) = (4.0 L × P2 × 301 K)

Dividing both sides by (4.0 L × 301 K):

P2 = (3.952 atm·L × 311 K) / (4.0 L × 301 K)

P2 = 1.027 atm

Therefore, the new pressure will be approximately 1.027 atm when the temperature is raised by ten degrees at the same volume.

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To calculate ΔG°rxn, we need to use the formula:

ΔG°rxn = ΣΔG°f(products) - ΣΔG°f(reactants)

First, we need to find the ΔG°f values for each compound involved in the reaction. We are given these values:

ΔG°f(HNO3) = -73.5 kJ/mol
ΔG°f(N2H4) = 149.3 kJ/mol
ΔG°f(N2) = -237.1 kJ/mol
ΔG°f(H2O) = 0 kJ/mol (since it's in its standard state)

Now, we can substitute these values into the formula:

ΔG°rxn = [7(-237.1) + 12(0)] - [4(-73.5) + 5(149.3)]
ΔG°rxn = -1659.7 - 1232.0
ΔG°rxn = -2891.7 kJ/mol

However, the question asks for the answer in kJ, not kJ/mol. So we need to divide by the number of moles of reaction (which is 1, since the coefficients are all in terms of 1 mole):

ΔG°rxn = -2891.7 kJ/mol ÷ 1 mol
ΔG°rxn = -2891.7 kJ

Therefore, the answer is B: -312.9 kJ (rounded to the nearest tenth).

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The products : Zn₃(PO₄)₂ (s) + KClO₃ (aq)

Given

reaction: Zn(ClO₃)₂ (aq) + K₃PO₄ (aq)

Required

The products

Solution

Double-Replacement reactions :  an ion exchange between two ion compounds in the reactant to form two new ion compounds in the product

General formula :

AB + CD ⇒ AD + CB

One of the characteristics of the double replacement reaction is the presence of precipitated compounds

Zn(ClO₃)₂ (aq) + K₃PO₄ (aq) ⇒ Zn₃(PO₄)₂ (s) + KClO₃ (aq)

Zn₃(PO₄)₂ (s)⇒ precipitated compounds, so that this reaction can occur

Answer:

A is a physical change, no atoms are being lost its still in it original form

B is a chemical change, it is losing atoms and changing into a new substance

Explanation:

The best summary of the given passage is Sumerians invented writing by drawing on soft pieces of clay because they needed some way to keep track of what they owned.

In the Mesopotamian areas, Sumer, an ancient civilization, was created. The area between the Euphrates and Tigris rivers is a fertile crescent.

They are well known for a variety of accomplishments, including their breakthroughs in the fields of language, government, architecture, and many others. The Sumerians are responsible for the contemporary human understanding of civilization.

The given text shows their contributions to drawing on soft pieces of clay which was their invention of writing.

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Which of the following is the best summary of the passage? Use the notes provided to guide you. Main Idea: The greatest gift the Sumerians gave the world was the invention of writing. Notes: Sumerians invented writing needed to keep records called cuneiform drew on clay tablets used shapes Sumerians The greatest gift the Sumerians gave the world was the invention of writing. The Sumerians were a wealthy people. They needed some way to keep track of what they owned. They began drawing pictures. They used a reed as a pen. They drew on soft pieces of clay. The soft clay was then dried in the sun. The tablet became a permanent record. Later, the Sumerian drawings changed into wedge-shaped symbols. This kind of writing is called cuneiform. By putting symbols together, the Sumerians could write entire sentences.

Answer:

!dk if this answers your question.

Explanation:

Astronomers have spent a lot of time measuring the rotation rates of galaxies. The rates do not fall off with distance as they would if visible matter was all there was. So, unlike the solar system, where the rate falls with distance, in galaxies the rate at the edge is too high to hold together, unless there is more mass than can be seen. This was the first indication of what is now termed 'dark matter'. It exists as huge blobs of mass that envelope galaxies. What it is made of, no one knows yet.

Wind and Erosion lead to Washing away of top soil.

Erosion is the process that lead to the washing away of top soil leading to loss of nutrient, holes and many more.

The agents of erosion include wind, water and so on.

Strong wind will lead to the top soil to be remove when it is blowing. Water also when is is flowing turbulently maybe when rain fall can lead to loss of top soil.

Therefore, Wind and Erosion lead to Washing away of top soil.

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Answer:

Id want to know how the nucleus looks like upclose, is it really that neutrons and protons are bond together, or are they just sticking in together. I'd also wanna look at electrons, or even possible hold them so that i can see the mass it really has

Explanation:

The effect of a catalyst on a chemical reaction is to react with product, effectively removing it and shifting the equilibrium to the right. The statement is false.

Catalyst is a substance used in a chemical reaction, not to react with the product or change it's composition, but to speed up the reaction. A chemical reaction would have been very slow without a catalyst. But with the one, it gets speed up and yields product faster than normal. This tells us that the statement provided is false.

A catalyst does not itself get involved in the reaction completely to change the reactants into the product. It just changes the conditions required like temperature, pressure, activation energy, etc. for an effective chemical reaction.

It does not even remove the product from the go and has no role in shifting the reaction towards equilibrium. Rather, once the products are obtained, it itself gets removed from the stage and can be used in another reactions.

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Answer:

1. rain  2. sleet  3. hail

Explanation:

I just did it.

sry if im really late

hope this helps =)

This is defined as any product of the condensation of atmospheric water vapor that falls under gravitational pull from clouds.

Different types of precipitation can be seen above with their appropriate characteristics.

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Answer: 5.6L

Explanation:

Just did it on an assignment

A 3.5L flexible container holds a gas at 250K. The new volume will be 5.6 L, if the temperature is increased to 400K.

Charles law is an ideal gas law which states that at a constant pressure volume of a gas is directly proportional to the absolute temperature.

It is expressed as

\(\frac{V_1}{T_1} = \frac{V_2}{T_2}\)

where,

V₁ = initial volume

T₁ = initial temperature

V₂ = final temperature

T₂ = final temperature

Now put the values in above formula, we get

\(\frac{V_1}{T_1} = \frac{V_2}{T_2}\)

\(\frac{3.5\ L}{250\ K} = \frac{V_2}{400\ K}\)

\(V_{2} = \frac{3.5\ L \times 400\ K}{250\ K}\)

\(V_{2} = \frac{1400}{250}\)

V₂ = 5.6 L

Thus, from the above conclusion we can say that A 3.5L flexible container holds a gas at 250K. The new volume will be 5.6 L, if the temperature is increased to 400K.

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Answer:

V2O5 is the empirical formula of vanadium oxide

Explanation:

The molecular mass of Vanadium is  50.949 g/mol

Number of moles of vanadium = 0.3456 g/50.949 g/mol = 0.00696 moles

The molecular mass of Oxygen is 16.0 g/mol

Number of moles of Oxygen = (0.6330 – 0.354) g/16 g/mol = 0.0174 moles

Emperical formula  

V (0.00696 moles/0.00696 moles) O (0.0174 moles /0.00696 moles)

V 1 O2.5

Multiply by two get a whole number  

V2 O5

The hydrogenation process is a chemical reaction that involves adding hydrogen to vegetable oils, which are naturally liquid at room temperature. This process is typically carried out by food manufacturers to convert liquid oils into solid fats.

During hydrogenation, unsaturated fats present in vegetable oils are chemically modified. These unsaturated fats have double bonds in their molecular structure. The hydrogenation process aims to break some of these double bonds and add hydrogen atoms to the fatty acid molecules. The addition of hydrogen atoms to the unsaturated fatty acid chains changes their structure and causes them to straighten out. This straightening effect leads to the formation of a more solid or semi-solid fat. The degree of hydrogenation determines the final consistency of the fat. Fully hydrogenated fats are solid, while partially hydrogenated fats tend to be semi-solid or have a creamy texture.

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A. The theoretical yield of PbO is 232.08 grams.

B. The percent yield of PbO is 73.26%.

A. Determine the theoretical yield of PbO if 50g of O2 is used:

We first need to determine the molar mass of O2, which is 32 g/mol (16 g/mol per oxygen atom).

Next, we can set up a stoichiometric ratio using the balanced equation:

2 moles of PbS react with 3 moles of O2 to produce 2 moles of PbO.

Using the molar ratio, we can calculate the moles of O2 used:

moles of O2 = (mass of O2 used) / (molar mass of O2)

moles of O2 = 50 g / 32 g/mol = 1.5625 mol

From the stoichiometry, we know that 2 moles of PbO are produced for every 3 moles of O2.

Therefore, the moles of PbO produced can be calculated as follows:

moles of PbO = (moles of O2) × (2 moles of PbO / 3 moles of O2)

moles of PbO = 1.5625 mol × (2/3) = 1.0417 mol

Finally, we can calculate the theoretical yield of PbO using its molar mass:

theoretical yield of PbO = (moles of PbO) × (molar mass of PbO)

theoretical yield of PbO = 1.0417 mol × 223.2 g/mol = 232.08 g

Therefore, the theoretical yield of PbO is 232.08 grams.

B) Calculate the percent yield if 170.0 g of PbO is obtained:

The percent yield is calculated by dividing the actual yield by the theoretical yield, then multiplying by 100%:

percent yield = (actual yield / theoretical yield) × 100%

percent yield = (170.0 g / 232.08 g) × 100% = 73.26%

Therefore, the percent yield of PbO is 73.26%.

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P.E = 1200J

Explanation:

P.E = MGH

P.E = 15 × 10 × 8

P.E = 1200J

The volume of the gas changed by approximately 0.280 m³ during the process.

To find the change in volume of the gas during the process, we can use the equation:

ΔQ = nCvΔT

where: ΔQ is the heat absorbed (3870 J),

n is the number of moles of the gas (7.70 mol),

Cv is the molar heat capacity at constant volume,

ΔT is the change in temperature (24.2 °C = 24.2 K).

Since the change in internal energy is zero (ΔU = 0), we know that ΔU = ΔQ + ΔW, where ΔW is the work done by the gas. In this case, since the process is at constant pressure, we can write ΔW = PΔV, where P is the pressure (1.62E+5 Pa) and ΔV is the change in volume.

Now, using the ideal gas law, we can express ΔV in terms of ΔT:

ΔV = (nRΔT) / P

where R is the ideal gas constant (8.314 J/(mol·K)).

Substituting the given values into the equations:

ΔQ = nCvΔT

3870 J = 7.70 mol × Cv × 24.2 K

From the equation ΔV = (nRΔT) / P, we have:

ΔV = (7.70 mol × 8.314 J/(mol·K) × 24.2 K) / (1.62E+5 Pa)

Simplifying the equations and performing the calculations:

ΔQ = nCvΔT

3870 J = 7.70 mol × Cv × 24.2 K

Cv ≈ 2.00 J/(mol·K) (calculated from the above equation)

ΔV = (7.70 mol × 8.314 J/(mol·K) × 24.2 K) / (1.62E+5 Pa)

ΔV ≈ 0.280 m³

Therefore, the volume of the gas changed by approximately 0.280 m³ during this process.

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Answer:

i hope this helped

They have no true nucleus as the DNA is not contained within a membrane or separated from the rest of the cell, but is coiled up in a region of the cytoplasm called the nucleoid. Prokaryotic organisms have varying cell shapes.

Explanation:

Answer:

Explanation:

The DNA in prokaryotes is contained in a central area of the cell called the nucleoid, which is not surrounded by a nuclear membrane. Many prokaryotes also carry small, circular DNA molecules called plasmids, which are distinct from the chromosomal DNA and can provide genetic advantages in specific environments.

Yes, compounds that can hydrogen bond to the silica gel have a lower Rf value than compounds that cannot hydrogen bond to the silica gel.

The Rf value (retention factor) is the distance traveled by the compound from the starting line to the position of the compound's center divided by the distance traveled by the solvent from the starting line to the position of the solvent's center.

In paper chromatography, the Rf value aids in the identification of the components of a mixture. In paper chromatography, the Rf value ranges from 0 to 1.

The Rf value of a compound is affected by the solvent, temperature, pressure, and the nature of the stationary and mobile phases.

When a compound can hydrogen bond with the stationary phase, it will stay on the silica gel, and its Rf value will be lower than the Rf value of the compound that cannot hydrogen bond with the stationary phase, and hence the answer is compounds that can hydrogen bond to the silica gel have a lower Rf value than compounds that cannot.

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