What states of matter do halogens exist in at room temperature?

For a series of weak acids, the increase in pKa means that the conjugate bases become more stable.

The term pKa refers to the negative logarithm of the acid dissociation constant. This is a constant that shows the extent to which an acid is dissociated in solution.

As the pKa of a series of  weak acids increases, the conjugate bases become more stable.

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Answer:

the answer is d.

1. Write the symbols for each element.

2. Find the charge for each element using the Periodic Table. Write it above each element. (because there is a (III) after nickel, the charge of nickel is +3. oxygen is in group 16, which means it has a -2 charge.)

3. See if the charges are balanced (if they are you're done!)

- when you criss cross (getting Ni2O3, the charges are canceled out, so the equation is balanced.

if you still need help or if this is confusing, look up How to Write the Formula for Nickel (III) oxide  by Wayne Breslyn on YT.

Answer:

D.) Ni2O3

Explanation:

edge 2021 (just needed the daily answer)

The volume of O₂ : 21 L

Given

8.7 grams of C₂H₄

Required

Volume O₂

Solution

Reaction

C₂H₄ + 3 O₂ ⇒ 2 CO₂ + 2 H₂O

mol C₂H₄(MW= 28 g/mol) :

= mass : MW

= 8.7 g : 28 g/mol

= 0.311

From the equation, mol  O₂ :

= 3/1 x mol C₂H₄

= 3/1 x 0.311

= 0.933

At STP, 1 mol gas=22.4 L, so for 0.933 mol :

= 0.933 x 22.4 L

= 20.899 L ≈ 21 L

Answer:

what are the roles of minerals in maintaning homeostasis?

Answer:

reaction to cold pack: change in temperature

Evidence of a chemical reaction etc is change in composition

Explanation: composition is atoms changeing and etc, which is a chemical reacton i think. Change in temperture is alsoa  chemical reaction but cold packs

Answer:

Cold pack: absorbs heat (endothermic reaction)

Hot pack: releases heat ( exothermic reaction)

Explanation:

when a cold pack/hot pack is shaken, water mixes with the chemicals in the outer layer and reacts to release or absorb heat.

After 2 half-lives, 1/4th of the initial radioactive sample remains.

In radioactivity, the rate of decay is proportional to the number of nuclei present. The rate of decay is measured in terms of the half-life, which is the time taken for half the nuclei present to decay. At the end of each half-life, the number of nuclei remaining is halved. Let the initial radioactive sample have a mass of 967 grams.

After one half-life, half of the nuclei would have decayed, and half would be remaining. After two half-lives, half of the remaining nuclei would have decayed again. Therefore, 1/4th of the initial radioactive sample would remain after two half-lives.

We can also use the formula for exponential decay to calculate the amount remaining after two half-lives. The formula is N = N0(1/2)^n where N0 is the initial number of nuclei, N is the number of nuclei remaining after n half-lives. In this case, N0 = 967 and n = 2. Therefore, N = 967(1/2)^2= 967(1/4) = 241.75 grams. After two half-lives, 241.75 grams of the initial radioactive sample remains.

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Answer:

Oxygen

Explanation:

This element has 8 protons (it doesn't matter if x or y are the protons, they both still have 8 of them), which means that the element is 8, otherwise known as Oxygen.

I don't know

Explanation:

because it does not give an question

Answer:

We can use the formula for exponential decay to solve this problem:

N(t) = N₀ * (1/2)^(t/T)

where:

N(t) is the amount of radioactive substance remaining after time t

N₀ is the initial amount of radioactive substance

T is the half-life of the substance

We know that T = 5730 years, N(t) = 2 grams, and t = 1000 years. We want to find N₀.

2 = N₀ * (1/2)^(1000/5730)

2/N₀ = (1/2)^(1000/5730)

log(2/N₀) = (1000/5730) * log(1/2)

log(2/N₀) = -0.000120968 * log(2)

Now we can solve for N₀ by taking the antilogarithm of both sides:

2/N₀ = 1/2^0.000120968

N₀ = 2 / (1/2^0.000120968)

N₀ ≈ 3.99 grams

Answer:

36.2874 $

Explanation:

1 ton = 907.185 kilograms.

907.185 x 0.04 =

36.2874

-kiniwih426

According to unit conversion,cost of coal in dollars per ton if it costs $0.04 per kilogram is 80 dollars per ton.

Unit conversion is defined as a multi-step process which involves multiplication or a division operation by a numerical factor.The process of unit conversion requires selection of appropriate number of significant figures and the rounding off procedure.

It involves a conversion factor which is an expression for expressing the relationship between the two units.A conversion ratio always has value which equals to one which indicates that numerator and denominator have values which are expressed in different units.

First, we need to convert the cost per kilogram to dollars per ton. There are 2000 kilograms in a ton. So, the cost per ton is $0.04/kilogram × 2000 kilograms/ton = $80/ton.

So the answer is 80 dollars per ton.

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Answer:

2Mg+O=2MgO

Explanation:

32gram of reacting

A one-carbon alkyl substituent is called a methyl group, which is represented by the symbol CH3.

The name for a one-carbon alkyl substituent is a methyl group. A methyl group is the smallest alkyl group consisting of a carbon atom and three hydrogen atoms. It is represented by the symbol CH3 and is attached to a carbon chain by a single covalent bond.

The term alkyl refers to a type of organic molecule consisting of a hydrocarbon chain with one less hydrogen atom than its parent molecule. Therefore, the term "alkyl substituent" refers to a part of a molecule where one or more hydrogen atoms are replaced by an alkyl group.

Methyl groups are widely used in organic chemistry, biochemistry, and pharmacology. For example, they are found in many important molecules such as methane, methanol, and acetic acid. They can also be used to modify the properties of other molecules, such as in the synthesis of drugs and polymers.

In conclusion, a one-carbon alkyl substituent is called a methyl group, which is represented by the symbol CH3.

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Answer:

D. Is the correct option.

Explanation:

2p level contains the electrons furthest from the nucleus in the case of Nitrogen thus it's much easier to disperse/remove the electrons from the shell due to low pull of nucleus energy.

The best explanation of how the spectrum is consistent with the electron shell model of the atom is the electrons in the 2p sub level have the smallest binding energy. Thus, option D is correct.

What is photoelectron spectrum?

Photoemission spectroscopy also known as photoelectron spectroscopy which photoelectric effect is the process in which electron are get energy from external source of energy like sunlight deals with energy measurement of energy emission or electrons emitted from solids, gases or liquids by the process of photoelectric effect,

Photoelectric effect is the process in which electron are get energy from external source of energy like sunlight and get excited and comes in excited state from the ground state due to this process continuos  flow of electron is take place and after that flow of energy is takes place.

Therefore,The best explanation of how the spectrum is consistent with the electron shell model of the atom is the electrons in the 2p sub level have the smallest binding energy. Thus, option D is correct.

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HClO will not dissociate completely in water among the given option.

When acids dissolve in water, they can dissociate into ions. Strong acids dissociate completely, while weak acids only partially dissociate. To determine which acid will not dissociate completely, we need to identify the weak acid among the options.

HClO is a weak acid known as hypochlorous acid. It does not dissociate completely in water. Instead, it partially dissociates into H⁺ and ClO⁻ ions.

On the other hand, HCl, HClO₄, and HNO₃ are strong acids and dissociate completely in water, producing H⁺ ions. These strong acids are considered to be fully ionized in aqueous solutions.

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Answer:

C

Explanation:

This is a chemical property because a catalyst is added(fire). Without a catalyst a marshmallow would stay a marshmallow. The sugar caramelizes(this is not physical because sugar is burning)

To determine the number of nanomoles of acetylcholine in the original 23 ml sample, we need to calculate the concentration of acetic acid produced from the pH change and then convert it to nanomoles using the molar mass of acetylcholine.

To determine the number of nanomoles of acetylcholine in the original 23 ml sample, we can use the pH change as a measure of the hydrogen ion concentration change resulting from the conversion of acetylcholine to acetic acid.

From the pH change, we can calculate the change in hydrogen ion concentration and then determine the concentration of acetic acid produced. Since acetylcholine is completely converted to choline and acetic acid, the concentration of acetic acid will be equal to the initial concentration of acetylcholine.

First, let's calculate the change in hydrogen ion concentration (∆[H+]) using the pH values:

∆pH = pH final - pH initial = 6.13 - 8.34 = -2.21

[H+] final = 10^(-pH final) = 10^(-6.13)

[H+] initial = 10^(-pH initial) = 10^(-8.34)

∆[H+] = [H+] final - [H+] initial = 10^(-6.13) - 10^(-8.34)

Next, we can calculate the concentration of acetic acid produced. Since acetic acid is formed in a 1:1 molar ratio with acetylcholine, the concentration of acetic acid will be equal to the concentration of acetylcholine in the original sample.

Now, we need to convert the volume of the sample from milliliters to liters:

Volume (V) = 23 ml = 23/1000 = 0.023 L

Acetic acid concentration = ∆[H+] * V (using the change in hydrogen ion concentration)

Finally, we can convert the concentration of acetic acid (and thus acetylcholine) to nanomoles:

Concentration in nanomoles = Acetic acid concentration * 1000 * molar mass of acetylcholine

The molar mass of acetylcholine is needed to perform this conversion.

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Answer: It has to be stratosphere because This region of the atmosphere is called the stratosphere. It is present in stratosphere According to NASA earth have 6 atmospheric layers..the layer just above the earth is troposphere and above this layer is the stratosphere.

Explanation:

The mole fractions and mass fractions of each element in the alloy are: Mole fractions: Ni = 0.0896, Cr = 0.1366, O = 0.7738 Mass fractions: Ni = 21.25%, Cr = 28.75%, O = 50% Average molecular weight: 20.8 g/mol.

To calculate the mole fractions and mass fractions of each element in the alloy, we need to first determine the total number of moles of each element:

moles of Ni = 17 g / 58.69 g/mol = 0.290 mol

moles of Cr = 23 g / 51.99 g/mol = 0.442 mol

moles of O = 40 g / 15.99 g/mol = 2.501 mol

The total number of moles in the alloy is then:

total moles = 0.290 mol + 0.442 mol + 2.501 mol = 3.233 mol

The mole fractions of each element are then:

mole fraction of Ni = 0.290 mol / 3.233 mol = 0.0896

mole fraction of Cr = 0.442 mol / 3.233 mol = 0.1366

mole fraction of O = 2.501 mol / 3.233 mol = 0.7738

The mass fractions of each element can be calculated as follows:

mass fraction of Ni = (17 g / 80 g) x 100% = 21.25%

mass fraction of Cr = (23 g / 80 g) x 100% = 28.75%

mass fraction of O = (40 g / 80 g) x 100% = 50%

The average molecular weight of the alloy can be calculated using the formula:

average molecular weight = (mass of Ni + mass of Cr + mass of O) / total moles

The mass of each element can be calculated as follows:

mass of Ni = 0.290 mol x 58.69 g/mol = 17.0 g

mass of Cr = 0.442 mol x 51.99 g/mol = 23.0 g

mass of O = 2.501 mol x 15.99 g/mol = 40.0 g

Substituting these values into the formula, we get:

average molecular weight = (17.0 g + 23.0 g + 40.0 g) / 3.233 mol

average molecular weight = 20.8 g/mol.

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Phosphoric acid has three equivalence points, corresponding to its three dissociable protons. In this lab, you should be able to see all three equivalence points if you perform a complete titration of the acid.

Phosphoric acid, which has the chemical formula H3PO4, is a triprotic acid. This means it has three acidic hydrogen atoms that can be donated to a base in an acid-base reaction.
Therefore, phosphoric acid has three equivalence points. An equivalence point is reached when the number of moles of the base added to the acid is equal to the number of moles of acidic hydrogens in the acid.
In a lab setting, you should be able to observe all three equivalence points if you carefully titrate the phosphoric acid with a strong base, such as sodium hydroxide (NaOH), and use an appropriate indicator or a pH meter to monitor the changes in pH during the titration.

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Answer:

C. is the correct answer

Explanation:

I took the test

Answer:

The new volume is 5.0L

Explanation:

Given:

Initial pressure (P₁) = 1.4 atm

Initial volume (V₁) = 2.3 L

Final pressure (P₂) = 0.65 atm

We'll use Boyle's Law:

P₁V₁ = P₂V₂

Substituting the given values:

(1.4 atm)(2.3 L) = (0.65 atm)(V₂)

Now, let's solve for V₂:

V₂ = (1.4 atm * 2.3 L) / 0.65 atm

Calculating this expression step-by-step:

V₂ = (3.22 atm·L) / 0.65 atm

V₂ ≈ 4.953 L

Rounded to one decimal place, the new volume is approximately 5.0 L.

Following represents the number of Molecules of the type indicated is present as a reactant or product of the chemical reaction shown is the coefficient of the species

The number of atoms, molecules, or formula units of a reactant or product in a balanced chemical equation is the coefficient of that species then the mole ratio of two substances in a chemical reaction is the ratio of their coefficients in the balanced chemical equation and the this numbers are called as coefficient and they tell how many of each molecule are participate in the reaction

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Answer:The amount of energy used or released as heat in a reaction.

Explanation:

Answer:

Hddhdhrvssj83hdi

Explanation:

Yee8373hes7

That's the question right

Appropriate benefit of dietary fiber intake to its associated disease.- c. Decreases intestinal transit time and exposure to potential toxins

Cardiovascular diseases (CVDs) are the most common cause of death worldwide, claiming the lives of an estimated 17.9 million persons each year. CVDs are a group of heart and blood disorders that include coronary artery disease, vascular disease, rheumatic fever, and others. Coronary heart disease could be cured, but treatment can help manage the symptoms and lower the risk of conditions such as heart attacks. Treatment may include changes in lifestyle, such as physical activity and quitting smoking. The most common symptom of heart disease is heart disease (CHD), which kills approximately 382,820 people every year. Every year, approximately 805,000 Americans suffer a heart attack.

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Answer:

The increase in the concentration of reactants increases the frequency of effective collisions.

Explanation:

The concentration of reactants determines the rate of reaction by providing the number of reactants available to yield an effective collision. There is a direct relationship between the concentration of reactants and rate of reaction.

Answer:

Repulsive forces exist only when atoms are very close to each other. (3/14) "They [the atoms] will approach until both nuclei will simply shove each other because both of them are positive." The balance between the attraction and repulsion forces determines how close the atoms can get. The relationships between the magnitude and direction of repulsive and attractive forces. A stable state of a bond is when attractive forces balance repulsion forces. “A stable state between two atoms is when they attract each other with a force that equals the force that they repel each other.”

The movement of nutrients, oxygen (O2), and the removal of metabolic wastes occur through the circulatory system, which consists of the heart, blood vessels, and blood. This system ensures the transportation of vital substances to cells and the removal of waste products from tissues.

The circulatory system plays a crucial role in the movement of nutrients, oxygen, and the elimination of metabolic wastes in the body. It consists of the heart, blood vessels, and blood. The heart acts as a pump that continuously propels the blood throughout the body. Arteries carry oxygenated blood away from the heart to the tissues, while veins transport deoxygenated blood back to the heart.

Within the blood, nutrients such as glucose, amino acids, vitamins, and minerals are dissolved and transported to various tissues and organs. Oxygen, essential for cellular respiration, binds to red blood cells in the lungs and is transported to the cells where it is needed. At the same time, metabolic wastes like carbon dioxide, produced as a result of cellular metabolism, are picked up from the tissues and carried back to the lungs for exhalation.

The capillaries, tiny blood vessels, are responsible for the exchange of substances between the blood and the surrounding tissues. Through their thin walls, nutrients and oxygen diffuse out of the capillaries into the cells, while waste products like carbon dioxide and other metabolic byproducts move from the cells into the capillaries for removal.

In summary, the circulatory system, comprised of the heart, blood vessels, and blood, facilitates the movement of nutrients, oxygen, and the elimination of metabolic wastes. This system ensures that vital substances reach the cells that need them while efficiently removing waste products from tissues, contributing to the overall functioning and homeostasis of the body.

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Answer:

The boiling point increases with increased pressure up to the critical point, where the gas and liquid properties become identical.

Dipoles produced by skewed electron distribution give rise to dispersion forces.

More electrons are present in larger molecules, which results in more distortions and a greater force.

Atoms and molecules that are bigger and heavier show larger dispersion forces than those that are smaller and lighter. The valence electrons are, on average, farther from the nucleus in a larger atom or molecule than in a smaller atom or molecule. They can more easily create transient dipoles because they are not held as tightly.

What are  London dispersion force ?

When the electrons in two nearby atoms occupy positions that cause the atoms to temporarily form dipoles, the consequence is the London dispersion force, a transient attractive force. The term "induced dipole-induced dipole attraction" is frequently used to describe this effect.

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