explaining how is it day time in the UAE and night time in the USA

Answer: Booting up the computer: When you turn on the computer, it requires a burst of energy to start up the various components and initialize the operating system.

Explanation:

Answer: The osmotic pressure of 5.0g of sucrose solution in 1 L is 271.32 torr.

Explanation:

Given: Mass = 5.0 g

Volume = 1 L

Molar mass of sucrose = 342.3 g/mol

Moles are the mass of a substance divided by its molar mass. So, moles of sucrose are calculated as follows.

\(Moles = \frac{mass}{molarmass}\\= \frac{5.0 g}{342.3 g/mol}\\= 0.0146 mol\)

Hence, concentration of sucrose is calculated as follows.

\(Concentration = \frac{moles}{Volume (in L)}\\= \frac{0.0146 mol}{1 L}\\= 0.0146 M\)

Formula used to calculate osmotic pressure is as follows.

\(\pi = CRT\)

where,

\(\pi\) = osmotic pressure

C = concentration

R = gas constant = 0.0821 L atm/mol K

T = temperature

Substitute the values into above formula as follows.

\(\pi = CRT\\= 0.0146 \times 0.0821 L atm/mol K \times 298 K\\= 0.357 atm (1 atm = 760 torr)\\= 271.32 torr\)

Thus, we can conclude that the osmotic pressure of 5.0g of sucrose solution in 1 L is 271.32 torr.

The symbol of the element in which it's ion has 38 protons, 36 electrons, and 40 neutrons is ⁷⁸₃₈Sr

To obtain the symbol of the element, we shall obtain the mass number of the element. This is shown below:

Mass number = Proton + Neutron

Mass number = 38 + 40

Mass number = 78

Finally, we shall determine the symbol of the element. Details below:

From the periodic table, the element with atomic number of 38 is Strontium.

Thus, the symbol of the element will be ⁷⁸₃₈Sr

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Answer:

\(\boxed {\boxed {\sf \frac {1}{3} \ mol \ Al_2O_3 \approx 0.34 \ mol \ Al_2O_3}}\)

Explanation:

We will use stoichiometry to solve this problem. The reaction given has a formula of

\(4Al+3O_2 \rightarrow 2Al_2O_3\)

The coefficients tell us the number of moles necessary for the reaction.

The reaction requires 3 moles of oxygen to produce 2 moles of aluminum oxide. We can make a ratio.

\(\frac {3 \ mol \ O_2}{ 2\ mol \ Al_2O_3}}\)

Since we are doing the reaction with 0.5 moles of oxygen, we multiply the ratio by that number.

\(0.5 \ mol \ O_2 *\frac {3 \ mol \ O_2}{ 2 \ mol \ Al_2O_3}}\)

Flip the ratio so the moles of oxygen cancel each other out.

\(0.5 \ mol \ O_2 *\frac {2 \ mol \ Al_2O_3}{ 3 \ mol \ O_2}}\)

\(0.5 *\frac {2 \ mol \ Al_2O_3}{ 3 }\)

\(\frac {1 \ mol \ Al_2O_3}{ 3 }\)

\(\frac {1}{3} \ mol \ Al_2O_3 = 0.33333 \ mol \ Al_2O_3 \approx 0.34 \ mol \ Al_2O_3\)

0.5 moles of oxygen produces 1/3 or approximately 0.34 moles of aluminum oxide.

Answer:

letter: B

Explanation:

thats is the true answer.

pleas heart my heart my answer

Answer:

bro please rotate it and send again please

Answer:

yes

Explanation: took quiz

The assumption that accounts for the great compressibility of gases compared to liquids and solids is assumption 1: Gases are made up of molecules which are relatively far apart. Option A)

The assumption that accounts for the great compressibility of gases compared to liquids and solids is assumption 1: Gases are made up of molecules which are relatively far apart.

In gases, the molecules are widely spaced and have significant gaps between them. This allows gases to be easily compressed under pressure. When external pressure is applied to a gas, the molecules can be brought closer together, reducing the volume occupied by the gas. The gaps between the molecules provide room for compression, allowing gases to occupy a smaller volume.

In contrast, liquids and solids have molecules or particles that are closely packed together. The intermolecular forces in liquids and solids are stronger, limiting their compressibility. The molecules or particles are already in close proximity, leaving little room for further compression.

Therefore, the assumption that gases consist of molecules that are relatively far apart accounts for their greater compressibility compared to liquids and solids. Hence Option A) is correct.

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Answer:

  1000 grams

Explanation:

Kilo- is the SI prefix meaning 1000. So, 1 kilogram is the same as 1000 grams.

7.0329 x10 mm] -4.43x104m√ = 2. * 6029 * Ten ^ - 4 * m I Water has a surface tension of 72.0 mJ/m2 at normal temperature.

What kind of energy is needed to transform a water drop with a 2.20 mm diameter into four smaller drops with the same size?

At room temperature, water has a surface tension of 72.0 mJ/m2.

I'll try it out even if it seems like a physics challenge rather than a chemical one.

Surface area of the sphere equals 4 r2.

Radius, diameter, and volume of sphere are equal to (4/3)r3 2.20 mils = 1.10 mils

The four new droplets' surface tension differences with the original droplet are?

The energy needed to complete the specified task would be 0.00173 mary jane - 0.00114 w / mk = 0.00059 mary jane = 5.9x10-4 mJ.

(NOTE: I just saw Brian L's "comment," and this solution is in fact rather similar to his response of 6.4x10-4 mJ.)

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7.0329 x10 mm] -4.43x104m√ = 2. * 6029 * Ten ^ - 4 * m I Water has a surface tension of 72.0 mJ/m2 at normal temperature.

At room temperature, water has a surface tension of 72.0 mJ/m2.

I'll try it out even if it seems like a physics challenge rather than a chemical one.

Surface area of the sphere equals 4 r2.

Radius, diameter, and volume of sphere are equal to (4/3)r3 2.20 mils = 1.10 mils

The four new droplets' surface tension differences with the original droplet are?

The energy needed to complete the specified task would be 0.00173 mary jane - 0.00114 w / mk = 0.00059 mary jane = 5.9x10-4 mJ.

(NOTE: I just saw Brian L's "comment," and this solution is in fact rather similar to his response of 6.4x10-4 mJ.)

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The statement that is true if the ΔEsys = -100 J is that the system looses 100J  of energy which is gained by the surroundings.

Note that the study of energy is what we call thermodynamics. We should note that according to the laws of thermodynamics, energy can not be created nor destroyed but can be converted from one form to another.

This implies that the energy that is lost by the system must be gained by the surroundings since there can never be energy that goes to waste in the system.

Recall that the universe is composed of the system and the surroundings and the energy that is lost by the system must be gained by the surroundings and vice versa. This would now be our guide in deciding which statement is right above from what we have in the question here.

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Answer:

the coefficient of y is -7

Answer:

0.43 M

Explanation:

The equation that should be used in this case would be:
pOH = pKb + log([A+]/[Base])
pKb = -log (4.6*10^-4) = 3.34
pOH = 14-10.2 = 3.8
[Base] = 0.15
3.8 = 3.34 + log x/0.15
0.46=log x/0.15
10^(0.46) = x/.15
x = 10^(0.46)  * 0.15 = 0.43 M

statement correctly describes the electronic charge distribution in a molecule-Option 2 The electronic charge is distributed equally around each atom in the molecule.

When charged matter is positioned in an electromagnetic field, it encounters a force due to its physical property of electrical charges. A positive or negative electric charge can exist (commonly carried by protons and electrons respectively). Like charges repel each other and, while unlike goods become more expensive one another. Coulomb, unit of electrical charges in the m long system, which serves as the foundation for the SI physical unit. C is the abbreviation. The coulomb is defined as the amount of electricity transferred in one second by a one-ampere current. Charge (exhibited by protons) and negative charge are indeed the two types of charge (exhibited by electrons.

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101 mmHg is the total pressure in the tank.

Thus, Dalton's Law of Partial Pressures states that while the volume and temperature of a gaseous mixture are held constant, the total pressure of the mixture is equal to the sum of the partial pressures of its gaseous components.

Nitrogen, oxygen, argon, carbon dioxide, water vapor, and a trace amount of other gases are all present in atmospheric air and pressure.

The increased oxygen content in the chamber can displace the CO bound to hemoglobin faster than air oxygen, hence the hyperbaric chambers are also used to treat carbon monoxide (CO) poisoning. The treatment of scuba divers with the bends is another application for hyperbaric chambers.

Thus, 101 mmHg is the total pressure in the tank.

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The most appropriate condition to turn a carboxylic acid into an alcohol is: LiAlH₄ (lithium aluminum hydride), and NaBH₄ (sodium borohydride). Option A, and D are correct.

LiAlH₄ (lithium aluminum hydride) is a powerful reducing agent commonly used in organic chemistry for the reduction of a variety of functional groups, including aldehydes, ketones, esters, carboxylic acids, and others. LiAlH₄ is a strong reducing agent that can reduce carboxylic acids to alcohols.

The reaction proceeds via a four-electron reduction pathway and results in the formation of the corresponding alcohol. The mechanism involves the initial formation of an alkoxyalane intermediate, which undergoes a second reduction step to yield the alcohol product.

NaBH₄ (sodium borohydride) is a mild reducing agent commonly used in organic chemistry to reduce a variety of functional groups, including aldehydes, ketones, esters, and carboxylic acids. In the case of carboxylic acids, NaBH₄ reduces the carbonyl group (-COOH) to an alcohol group (-OH) by a two-electron reduction pathway, similar to LiAlH₄.

The reaction is usually carried out in aqueous or alcoholic solvents and requires the addition of a proton source (such as HCl or H₂SO₄) to activate the carboxylic acid before reduction.

Hence, A. D. is the correct option.

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--The given question is incorrect, the correct question is

"Select the most appropriate condition(s) to turn a carboxylic acid into an alcohol. note: assume all reagents are in excess. one or more answers may be correct. group of answer choices A) LiAlH₄ , B) K₂Cr₂O₇, C) DIBAL-H, D) NaBH₄, E) MeOH F) CH₃MgBr."--

Answer: True

Explanation:

An error during DNA replication would create a gene mutation.

During DNA replication, the genetic information in a cell is copied to make new DNA molecules. However, mistakes can occur during this process, leading to changes in the DNA sequence, which can result in a mutation. Mutations can also be caused by exposure to environmental factors, such as radiation or chemicals, which can damage the DNA molecule directly or affect the cellular processes involved in DNA replication.

Mutations can have a variety of effects on the organism, ranging from no effect to causing serious health problems or even death. Gene mutations can also be inherited from a parent, which can result in genetic disorders or predisposition to certain diseases. Therefore, it is important to understand the mechanisms of gene mutations and their potential impacts on organisms.

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Answer: C. investigations are usually wrong

Explanation: Because investigation are usually wrong and then that leads to more  and more questions

Answer:

How do amoeba respire.

How do plants respire.

Answer:

solubility

Explanation:

Answer:

See figure 1

Explanation:

In this case, we have to start with the ionization reaction of HBr to produce the hydronium ion (\(H^+\)) and the bromide ion (\(Br^-\)). Then the double bond in the alkene can attack the hydronium ion to produce a carbocation. The most stable carbocation would be the tertiary one, therefore we have to put the positive charge in the tertiary carbon. Then, the bromide attacks the carbocation to produce the final halide.

See figure 1

I hope it helps!

Answer:

By satisfying the duet rule or the octet rule, ions are more stable.

Explanation:

Ionic bonds are formed through the exchange of valence electrons between atoms, typically a metal and a nonmetal. The loss or gain of valence electrons allows ions to obey the octet rule and become more stable.

The octet rule states that an atom is most stable when there are eight electrons in its valence shell. Atoms with less than eight electrons tend to satisfy the duet rule, having two electrons in their valence shell. By satisfying the duet rule or the octet rule, ions are more stable.

I HOPE THIS HELPS!!!!

Answer:

CaCl2

Explanation:

Cacl2 would have greatest freezing point depression because in this case the vant Hoff factor is 2

More will be the value of vant Hoff factor more will be the depression in freezing point when concentration of all electrolyte is same

The value of enthalpy(ΔHº) for the final reaction (2C(s) + H₂(g) → C₂H₂(g) ) is  -1932.8KJ.

A system's enthalpy is its heat capacity. A reaction's enthalpy change is roughly equivalent to how much energy is lost or gained throughout the reaction. If the enthalpy of the system decreases over the reaction, the reaction is preferred.

C(s) + O₂(g) → CO₂(g) ΔHº = -94.6 kJ --- (1)

H₂(g) + O₂(g) → H₂O(l) ΔHº = -286.0 kJ ---(2)

2C₂H₂(g) + 5O₂(g) → 4CO₂(g) + 2H₂O (l)  ΔHº = -2598.8 kJ ---(3)

The value of ΔHº for the final reaction,

2C(s) + H₂(g) → C₂H₂(g)

ΔH₄° = 2× ΔH₂º +  ΔH₃º - ΔH₁º
ΔH₄° = 2× -286.0 + ( -2598.8) - (- 94.6)

ΔH₄° = 2× -286.0 -2598.8 + 94.6

ΔH₄° = 666 - 2598.8

ΔH₄° = -1932.8KJ.

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The heat needed to convert 40.0 grams of CH₃OH (s) at -97.53˚C to CH₃OH (l) at -43˚C is equal to 5278.5 J.

The specific heat capacity can be defined as the heat required to raise the temperature of one unit of mass by one degree Celsius. The specific heat capacity depends upon the type of material.

The mathematical form is used to calculate the specific heat is equal to:

Q = mCΔT

Given, the mass of the methanol, m = 40 g

The final temperature of the methanol, T₂ = -43°C

The change in temperature of methanol, ΔT = -43 + 97.53 = 54.53°C

The specific heat capacity of methanol, C =  2.5 J/g·°C

The heat required to change methanol temperature:

Q = 40 × 2.42 × 54.53

Q = 5278.5 J

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Answer:

They are plants also known as plankton and they produce about 80-85% of the world's oxygen.

Explanation:

Answer:

3.17 V

Explanation:

The cell is operating under standard conditions. These standard conditions include; that the reaction takes place at 298 Kelvin (room temperature), the pressure of the system is 1 atmosphere (standard pressure), and the solutions have a Molarity of 1.0 M for both the anode and cathode solutions. All these conditions are satisfied in the cell under review in the question.

Hence;

E°anode (magnesium)= -2.37 V

E°cathode (silver) = 0.80 V

E°cell= E°cathode -E°anode

E°cell= 0.80-(-2.37)

E°cell= 0.80 + 2.37

E°cell= 3.17 V

Hence the standard cell potential of this cell at 25°C is 3.17 V

Answer:

The standard potential at 25ºC is 3.17 V.

Explanation:

The anode in  a galvanic cell is the electrode at which oxidation occurs and the cathode is the electrode  at which reduction occurs.

The overall cell reaction  will be the sum of two half-cell reactions. The standard reduction potentials are:

Mg²⁺ (1.0 M) + 2e⁻  →  Mg (s)          Eº = -2.37

Ag⁺ (1.0 M) + e⁻ → Ag (s)                 Eº= +0.80

Since the reactants are in their standard states (1.0 M) and at 25ºC we can write the half-cell reactions as follows:

Anode (oxidation):                        Mg (s) → Mg²⁺ (1.0 M) + 2e⁻

Cathode (reduction):     2Ag⁺ (1.0 M) + 2e⁻ → 2Ag (s)

Overall:            Mg (s) +2 Ag⁺ (1.0 M) + 2e⁻ → 2Ag (s) + Mg²⁺ (1.0 M) + 2e⁻

In order to balance the overall equation we multiply the reduction of  Ag⁺ by 2. We can do so because, as an intensive property, E° is not affected by  this procedure.

The standard emf of the cell, E°cell , which is composed of a contribution  from the anode and a contribution from the cathode, is given by:

\( Eº cell = Eº cathode - Eº anode \)

\( Eº cell = EºAg⁺/Ag - Eº Mg²⁺/Mg \)

\( Eº cell =0.80 V - (-2.37 V) \)

Eº cell = 3.17 V

1.These seasonal plankton generally blooms  which helps the world's great fisheries that takes massive amounts of oxygen in the ocean.

Phytoplankton are considered as microscopic plant organisms that thrives in the ocean they live in bottom of the marine food chain. They are considered for the production of oxygen and also helps in about half of the photosynthesis on Earth. Phytoplankton also blooms, with the rapid increase of the population of these organisms, they also have significant impacts on the environment.

North Atlantic Aerosols and Marine Ecosystems Study (NAAMES) is a research project which targets in the investigation  of the complex and interactions between phytoplankton, aerosols, and the atmosphere .

The above question is incomplete

phytoplankton are well known for being the bottom of the food chain in the ocean, but they have a widespread impact on earth during blooms. nasa researchers and scientists who are part of north Atlantis aerosols and marine ecosystems study, or naames are investigating all of the following except:

1.These seasonal plankton generally blooms  which helps the world's great fisheries that takes massive amounts of oxygen in the ocean.

2. Phytoplankton also release toxins which can cause harm to fish and other marine animals, and the decomposition of the dead phytoplankton can lead to oxygen .

3.The impacts of phytoplankton also blooms on the ocean's carbon cycle and the environmental composition.

Hence, 1 is the correct option

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