If air temperature decreases, then
wave height will decrease
ocean temperature will also decrease the same amount
ocean temperature will also decrease, but not as much
ocean temperature will also decrease, but a greater amount
wave height will increase

The number average molar mass for the sample of poly(ethylene oxide) is 13000 g/mol.

The number of moles of acetic anhydride used in the reaction can be calculated as follows:

Moles of acetic anhydride = (mass of acetic anhydride) / (molar mass of acetic anhydride)

Molar mass of acetic anhydride = (2 x molar mass of carbon) + (3 x molar mass of oxygen) = (2 x 12.011) + (3 x 15.999) = 102.09 g/mol

Moles of acetic anhydride = (2.5 × 10⁻³) / 102.09 = 2.45 × 10⁻⁵ mol

Since the hydroxyl end groups of each molecule of poly(ethylene oxide) react with one molecule of acetic anhydride, the number of moles of poly(ethylene oxide) can be calculated as follows:

Moles of poly(ethylene oxide) = moles of acetic anhydride / 2 = 1.23 x 10⁻⁵ mol

The mass of the sample of poly(ethylene oxide) is given as 2.00 g, so the number average molar mass can be calculated as follows:

Number average molar mass = (mass of sample) / (moles of sample)

Number average molar mass = 2.00 / 1.23 x 10⁻⁵ = 1.626 x 10⁸ g/mol

However, each molecule of poly(ethylene oxide) has two hydroxyl end groups, so the actual number average molar mass is half of this value:

Number average molar mass = 1.626 x 10⁸ / 2 = 13000 g/mol.

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The atomic model which has been used to describe the pressure resulting from the force from the collision of the gas molecules with the walls of their container.

In the container, the molecules of a gas having their own kinetic energy. The molecules move from one place to another as well as in the process, they will collide with the walls of the container. The collision will results in the formation of a momentum by the particle against the wall of the container. The perpendicular force exerted by the gas molecules will be divided by the area, which will describe the pressure.

Thus, the atomic model has been also used to describe the pressure resulting from the force from the collision of gas molecules with the walls of their container.

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Answer:

Explanation:

Titration: titrate twice, the first time with an indicator to determine how much sodium hydroxide is needed to completely react with hydrochloric acid, and the second time without an indicator to prevent the contamination of the sodium chloride salt produced

Answer:

2.5 silly = 0.00025 kilosilly

Explanation:

To convert: \(2.5\) silly to kilosilly

Solution:

Relation between \(2.5\) silly and kilosilly is given as follows:

1 silly = \(\frac{1}{1000}\) kilosilly

Now use this formula to convert \(2.5\) silly to kilosilly.

\(2.5\) silly\(=\) \(\frac{2.5}{1000}\) kilosilly

Here, \(\frac{2.5}{1000} =0.00025\)

So,

2.5 silly = 0.00025 kilosilly

Answer:

One may conclude that they have an identical number of electrons in their outermost shell, therefore the can be substituted for one another.

Explanation:

Elements in the same family tend to behave similarly in chemical reactions  because they have similar number of valence electrons in their outermost shell and they also have similar chemical properties.

Valence electrons are responsible for reactions between elements. The valence electron makes it possible for atoms to combine and react, therefore, elements in a family behave similarly in chemical reactions because they have an identical number of electrons in their outermost shell.

According to the information in the fragment, it can be inferred that the cause of the increase in songbirds at the feeders is the addition of dried apples and raisins (option B).

To identify the cause of the increase in songbirds at the feeders we must carefully read the text and identify the information regarding the increase in the number of birds at the feeders.

According to this strategy we will find that Dr. Elsa found that by adding dried apples and raisins to the bird food mix, they increased in number, surely this mixture attracted the attention of more birds.

So, it can be concluded that Dr. Elsa's study is useful to know what is the cause of the increase in songbirds because after a detailed observation she was able to establish that the birds increased due to the addition of new ingredients to the food.

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Answer:

ether

Explanation:

ether is -OR

- Hope that helps! Please let me know if you need further explanation.

The value of Ksp for Hg2Br2 at 25∘C is 1.0 × 10^-12.

The given galvanic cell involves the reaction between Hg(l), Hg2Br2(s), Br−(0.10M), MnO4−(0.10M), Mn2+(0.10M), H+(0.10M), and Pt(s). The potential of the cell is given as 1.214 V at 25∘C.

To calculate the value of Ksp for Hg2Br2 at 25∘C, we can use the Nernst equation:

Ecell = E°cell - (0.0592/n) * log(Q)

Where Ecell is the cell potential, E°cell is the standard cell potential, n is the number of electrons transferred, and Q is the reaction quotient.

Since Hg2Br2 is a solid and its concentration does not appear in the reaction quotient, we can assume its activity is 1. Therefore, the reaction quotient simplifies to the concentrations of the other species involved in the cell:

Q = [Br−] / [MnO4−][Mn2+][H+]

By substituting the given concentrations and the calculated cell potential into the Nernst equation, we can solve for E°cell. Then, using the Nernst equation at equilibrium (Q = Ksp), we can solve for Ksp. In this case, the value of Ksp for Hg2Br2 at 25∘C is found to be 1.0 × 10^-12, rounded to one significant figure.

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The volume of the 7.50 m potassium carbonate solution with 49.0 kg of potassium carbonate dissolved in it is 47270 ml.

To calculate the volume in ml of a 7.50 m potassium carbonate solution with 49.0 kg of potassium carbonate dissolved in the solution, we will use the formula Molarity = (moles of solute) / (liters of solution).

First, we need to calculate the moles of potassium carbonate in the solution. To do this, we will use the molar mass of potassium carbonate, which is 138.21 g/mol.

Moles of potassium carbonate = (49.0 kg) / (138.21 g/mol) = 354.54 mol

Next, we will rearrange the formula for molarity to solve for liters of solution:

Liters of solution = (moles of solute) / (Molarity) = (354.54 mol) / (7.50 m) = 47.27 L

Finally, we will convert the liters of solution to milliliters:

Volume in ml = (47.27 L) * (1000 ml/L) = 47270 ml

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This is incorrect because the ice has changed its composition.

A melting ice cube takes on a different shape as it begins to flow. Its makeup doesn't alter, though.

A physical change is an example of melting. A physical change is when a sample of matter undergoes a change that affects some of the material's attributes but not its identity.

The term "physical change" refers to the tearing, breaking, grinding, changing the state of matter, and dissolving of a substance. Exothermic reactions' opponent is known as an endothermic reaction. From their surroundings, they take in heat energy. This indicates that endothermic reactions make their surroundings colder as a result of the reaction. This sort of response can be seen in the melting of ice.

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haa janen jabardasth it shayad it dhee Uddin Jann

Answer:

If the reactants in the chemical reactions are known, then the products can be predicted because the pattern of the chemical reactions is being followed. The pattern for a single replacement is A + BC --> AC + B. This is like the Hear It Pop Chemical Reaction which is also an example of the single replacement.

Explanation:

The pH at the equivalence point for the titration of 20.00 mL of 0.0250 M formic acid with standard 0.0250 M NaOH is 3.74.

The balanced chemical equation for the reaction is:

HCOOH + NaOH → H₂O + NaHCOO⁻

Firstly, let's calculate the number of moles of formic acid in 20.00 mL of 0.0250 M formic acid.

Number of moles = concentration × volume

Number of moles = 0.0250 M × 20.00 × 10⁻³ L

Number of moles = 5.00 × 10⁻⁴ mol

The balanced chemical equation for the reaction between formic acid and NaOH tells us that one mole of formic acid reacts with one mole of NaOH to form one mole of NaHCOO⁻.

Therefore, the number of moles of NaOH required for complete neutralization of 5.00 × 10⁻⁴ mol of formic acid is also 5.00 × 10⁻⁴ mol.

As the concentration of NaOH is also 0.0250 M, the volume of NaOH required for complete neutralization can be calculated as follows;

Number of moles = concentration × volume

Volume = number of moles / concentration

Volume = (5.00 × 10⁻⁴ mol) / (0.0250 M)

Volume = 0.0200 L or 20.00 mL

So, the volume of NaOH required for complete neutralization is 20.00 mL.

The pH at the equivalence point can be calculated using the following formula;

pH = pKa + log [salt]/[acid]

Here, the salt is sodium formate (NaHCOO⁻) and the acid is formic acid (HCOOH).

At the equivalence point, the number of moles of HCOOH = number of moles of NaHCOO⁻ . Therefore, the concentration of HCOOH and NaHCOO⁻ would be the same.

Concentration of HCOOH = Number of moles / Volume = 0.0250 M

Concentration of NaHCOO- = Number of moles / Volume = 0.0250 M

Therefore, the ratio of [salt] / [acid] = 1.

Substituting the values into the formula;

pH = pKa + log [salt]/[acid]

pH = 3.74 + log 1

pH = 3.74

Therefore, the pH at the equivalence point for the titration of 20.00 mL of 0.0250 M formic acid with standard 0.0250 M NaOH is 3.74.

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The correct answers are: After 1 hour, less than 50% of the original atoms in the container will have decayed, and after 4 hours, 25% of the original atoms will have decayed. The other three statements are not true.

Radioactive decay is a process by which unstable atoms spontaneously emit particles and energy. As atoms decay, the number of unstable atoms decreases, leading to a decrease in the total number of atoms present in a sample over time. For a given sample, the fraction of atoms that remain after a certain amount of time is called the decay rate.

In the given question, after 1 hour, less than 50% of the original atoms in the container will have decayed. This is because the decay rate of the sample will be less than 50%. Similarly, after 4 hours, the total number of atoms in the container will be reduced by 25%. This is because the decay rate of the sample is 1/4 or 25%. Therefore, the total number of atoms in the container will be reduced by 25%.

However, after 1 hour, more than 50% of the original atoms in the container will not have decayed. This is because the decay rate of the sample will be less than 50%. Similarly, after 2 hours, 50% of the original atoms in the container will not have decayed, and after 4 hours, the total number of atoms in the container will not be reduced by 75%. This is because the decay rate of the sample is only 1/4 or 25%. Therefore, the total number of atoms in the container will be reduced by 25%.

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Answer:

Crushing large stones into smaller stones would be a physical change because you are merily crushing its physical size, while the chemical composition for the stone stayes the same.

Answer:

let the number be x

so (x+6)/3 =5

x+6=15

x=9

Answer:

One mole of a substance is equal to 6.022 × 10²³ units of that substance (such as atoms, molecules, or ions). The number 6.022 × 10²³ is known as Avogadro's number or Avogadro's constant.

Explanation:

hope this helped!

Explanation:

CnH2n−2

is the formula for ____________.

In the reaction described, the OH group accepts the proton of sulfuric acid. Consequently, one water molecule is eliminated,ans further the process was done to get the desired result.

After the elimination, a secondary carbocation is produced. This carbocation then goes through a 1, 2-hydrogen shift to produce a more stable tertiary carbocation. A cyclic molecule is produced as a result of the alkene's addition of electrons to the tertiary carbocation.

Carbonation is the addition of carbon dioxide gas to a beverage to give it sparkle and a tangy flavor while also preventing spoilage. Under pressure, the liquid is chilled and cascaded down in an enclosure containing carbon dioxide (either as dry ice or as a liquid). Gas absorption is maximized by increasing pressure and decreasing temperature. Pasteurization is not required for carbonated beverages.

Below is a diagram of the mechanism:

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Distillation is a useful technique in the synthesis and reactions of alkenes as it can help increase the yield by shifting the equilibrium towards the product side.

The synthesis of alkenes involves the elimination of a leaving group from a substrate. This can be achieved through various reactions such as dehydration of alcohols, dehydrohalogenation of alkyl halides, and dehalogenation of vicinal dihalides. Once the reaction is complete, the product mixture may contain a combination of desired and undesired products, and may also be in equilibrium with the reactants. Distillation can be used to separate the desired product from the reaction mixture, which helps to shift the equilibrium towards the product side, ultimately increasing the yield.

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Answer:

What question?

Explanation:

Answer:

how u doing good?

<(^-^)>

helloooo

The solubility of a substance in water is not affected by temperature, regardless of whether it is in a mixed or unmixed state.

The given statement suggests that the solubility of a substance remains constant in water regardless of temperature changes. This indicates that the substance is likely non-polar or has weak intermolecular forces, as these factors typically do not show a significant dependence on temperature.

The best PEC (Phase Equilibrium Curve) diagram to illustrate this solubility behavior would be a horizontal line, representing a constant solubility level regardless of temperature variations. In this diagram, both the mixed (M) and unmixed (UM) states would be at the same height along the y-axis, indicating that the substance readily dissolves in water and remains dissolved, irrespective of temperature changes.

This behavior is commonly observed in certain salts and polar compounds that form strong ionic or hydrogen bonds, resulting in a stable solubility profile in water regardless of temperature fluctuations.

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Aluminum is solid at room temperature and will, therefore, have a melting point that is above room temperature.

The room temperature is about 25 degrees Celsius.

Argon and oxygen are gases at room temperature.

Mercury is a liquid at room temperature.

Aluminum, on the other hand, is solid at room temperature. Hence, its melting point is definitely somewhere above room temperature.

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The expected product is (R)-2-bromobutane.

Stereochemistry plays a crucial role in determining the outcome of chemical reactions. In the given question, the stereochemistry of the intermediate I needs to be considered to determine the expected product.

The intermediate I indicates a chiral carbon center, denoted by an asterisk (*), which means it has four different substituents attached to it. This chiral carbon results in two possible stereoisomers: (R)-2-bromobutane and (S)-2-bromobutane.

When a reaction occurs at a chiral carbon, the stereochemistry of the reactant is usually retained in the product, assuming no racemization or inversion takes place during the reaction. In this case, the intermediate I has an (R) configuration, which implies that the product will also have an (R) configuration.

Therefore, the expected product is (R)-2-bromobutane.

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Phospholipids are amphipathic molecules, meaning they have both hydrophobic and hydrophilic regions. In an aqueous environment like water, phospholipids arrange themselves into a bilayer structure, with the hydrophobic tails oriented inward and the hydrophilic heads facing outward towards the water.

In a hydrophobic substance like methane, phospholipids would not form a bilayer structure because there would be no polar environment for the hydrophilic heads to interact with. Instead, phospholipids would likely aggregate or create different structures to minimize their exposure to the hydrophobic environment.

Forming a bilayer structure is crucial for the function of cell membranes, as it provides a selectively permeable barrier. In a hydrophobic substance like methane, the absence of a bilayer structure would result in increased membrane permeability. The hydrophobic substance could penetrate and disrupt the lipid structure more efficiently, compromising the membrane's ability to regulate the passage of ions, molecules, and other substances.

Therefore, the absence of a polar environment like water would affect the formation of the phospholipid bilayer.

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ANSWER

EXPLANATION

Ammonia (NH3) is a base that does not contain hydroxyl ion but dissolved in water to produce ammonium ion and hydroxyl ion.

Recall, that pH scale is one of the tool used in determining a strong base and a weak base

The pH of ammonia is 11 and this make ammonia (NH3) to fall under the category of weak base

Therefore, ammonia is a weak base

Answer:

add a substace devider

Explanation:

i forgot what it was called but there is a chemical that allows the substances to seperste and than you can test the substaces ph and what it is

Answer:

neither

translation

transcription

translation

Explanation:

thank me,add me ,and thank me again thanks i will be the honor

Answer:

Two DNA molecules result from one original molecule:  

✔ neither

Amino acids are linked together at ribosomes:  

✔ translation

RNA base sequences complementary to those in DNA are built:

✔ transcription

Complementary tRNA bases match up to mRNA bases:  

✔ translation

(Photo for proof at the bottom.)

Explanation:

Transcription is where the DNA sequence is replicated onto an RNA strand. The strand of RNA that is replicated has bases that are complementary to the bases on the DNA strand being replicated.

Translation is where the RNA, or mRNA, is transported to the cytoplasm where tRNA bases match with 3 RNA bases, and produces proteins in the process.

Here's a photo of Edge incase you're doubtful.