Calculate the ratio of naf to hf required to create a buffer with ph = 4.00.

5 H2SO4 + 2 H2O In this reaction 14 hydrogen atoms, one Sulphur atom, and 22 atoms of oxygen present in each element.

A chemical element is a species of atoms, including the pure material made entirely of that species, that have a specific number of protons in their nuclei. Chemical elements, unlike chemical compounds, cannot be reduced by any chemical process into simpler molecules.

The most basic form of a material is an element. In general, it cannot be streamlined or divided into smaller parts. A component of an element is an atom.

A certain element only has one kind of atom per atom. Protons, neutrons, and electrons, which are subatomic particles, make up the remainder of an atom.

Thus, In this reaction 14 hydrogen atoms, one Sulphur atom, and 22 atoms of oxygen present in each element.

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A scientist mixes 0.02 g of a strong monoprotic base in 83ml of water and obtains a pH of 12 . The most likely the identity of this base is KOH.

Similar to monoprotic acids, monoprotic bases only have one equivalence point and can only react with one proton per molecule.

Since it completely dissociates into its constituent ions in its aqueous solution, potassium hydroxide, or KOH, is a strong basic. It is an inorganic substance that is frequently referred to as caustic potash. Due to its caustic nature and interactions with acids, it has a wide range of industrial applications.

There is no correlation between the quantity of acidic hydrogens in a molecule and their acidity (or specifically, how acidic the most acidic one is). Triprotic phosphoric acid is significantly weaker than monoprotic hydrochloric acid, whereas diprotic sulfuric acid is much stronger than hydrofluoric acid (monoprotic)

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The mass of the air remains constant but its volume drops when it is cooled. The density of the air rises when it is cooled.

The water molecules lost energy and slowed down as a result of the drop in temperature, causing them to move closer to one another and reduce the volume of the liquid. Water expands or gains volume when heated.

The density of the air in a column of space between two elevations is measured by the difference in barometric pressure between observation locations at various altitudes. Less dense than cold air is warm air.

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Answer:

A) Oxygen

Explanation:

i just took the test.

Answer:

i think it is A

Explanation:

i got this answer from a good friend

The magma deep below Earth's surface cool slowly.Large crystals form results from magma cooling deep below Earth's surface. Therefore, option A is correct.

Magma is the molten or semi-molten natural material that gives rise to all igneous rocks. Magma can be found beneath the Earth's surface, and evidence of magmatism has been discovered on other terrestrial planets and natural satellites.

When magma slowly cools deep within the crust, the resulting rock is known as intrusive or plutonic. Because of the slow cooling, crystals can grow large, giving intrusive igneous rock a coarse-grained or phaneritic texture. Individual crystals in phaneritic texture can be seen with the eye.

Intrusive igneous rocks form when magma slowly cools and solidifies beneath the Earth's surface. Large, well-formed crystals are found in intrusive igneous rocks such as granite, gabbro, diorite, and dunite.

Thus, option A is correct.

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Answer:

the valency of sodium is one because sodium loses 1 electron to become stable

Answer:

The equinoxes are the only time when both the Northern and Southern Hemispheres experience roughly equal amounts of daytime and nighttime. On Earth, there are two equinoxes every year: one around March 21 and another around September 22.

Explanation:

Answer:

all of the above

Explanation:

all of this is in the solar system

Answer:

56.64°c

Explanation:

its obtained from facts that heat gained by water=heat lost by calorimeter

Answer:

decompression melting

Explanation:

if not then flux melting

Nuclear fusion is a process through which the nucleus fuse together just to generate heavier nuclei. Extremely high temperatures can force atoms together, allowing the nuclear charge to connect.

Therefore the answer is "Option D".

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Answer:

answer is D, took the test chem connexus

Explanation:

Explanation:

350 g  *  25 C  * .39 J / (g C) = ~ 3400 J

Answer:

blizzard because it is cold and rainy all the time.

Explanation:

Blizzard is a natural disaster that is least likely to occur in Maryland.

Maryland was a home to 7th state in united states. Maryland’s most common natural disasters include :

Maryland has been impacted by several floods. Hurricane season begins one June 1st. Different storms are seen in Maryland.  There are two types of disaster manmade and natural. Floods, volcanoes are natural disasters.

Maryland has vast variety of tropological features which include lakes, rivers, mountains and pine forests. Blizzard is a dangerous weather event, it is a snowfall.

Therefore, Blizzard is a natural disaster that is least likely to occur in Maryland.

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Answer:Nhóm gồm tất cả các kim loại tan trong axit sunfuric đặc nóng nhưng không tan trong axit sunfuric lo

Al, Cu, Au.

Al, Fe, Cr.

Ag, Fe, Pt.

Ag, Cu, Hg.

Explanation:

Answer: the statement issues are addressed by the people working together is true about activation.

Explanation:

The answer of this question is True.

About 20 percent of your daily energy needs is determined by your BMR.

BMR stands for basal metabolic rate.What is Basal Metabolic Rate (BMR)?

BMR is the amount of energy, in calories, used by your body when at rest.

It is an estimation of the number of calories required to keep your body functioning while at rest.

In other words, it is the minimum amount of calories your body requires to carry out its everyday processes, such as breathing and circulating blood, while at rest.

There are several factors that affect BMR, including age, gender, height, weight, and body composition.

A higher BMR implies that the body requires more calories to maintain its energy requirements.

Hence, about 20 percent of your daily energy needs is determined by your BMR.

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The force constant of CO is  1840 Nm⁻¹. the vibrational frequency in cm is given as 6.5 × 10¹³ s⁻¹.

given that :

The force constant of CO, k = 1840 Nm⁻¹

mass of C , m2 = 19.9 × 10⁻²⁷ kg

mass of H , m2 = 26.6 × 10⁻²⁷ kg

The expression for the vibrational frequency is given as :

v = ( 1/ 2πc) √ k / u

u = m1 m2 / m1 + m2

u = (19.9 × 10⁻²⁷ × 26.6 × 10⁻²⁷) / (19.9 × 10⁻²⁷ + 26.6 × 10⁻²⁷)

u = 1.13 × 10⁻²⁶ kg

v = ( 1/ 2πc) √ k / u

v = ( 1/ 2πc) √  1840 /  1.13 × 10⁻²⁶

v = 6.5 × 10¹³ s⁻¹

Thus, the vibrational frequency is  6.5 × 10¹³ s⁻¹.

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Sodium from Na3PO4(aq) could be prepared by electrolysis of the aqueous solution shown. Based on the provided options, the element that could be prepared by electrolysis of the aqueous solution shown

Potassium from KCl(aq)
Here's why:
- Sodium from Na3PO4(aq) and Nitrogen from AgNO3(aq) are not possible because these ions are more stable in solution than undergoing electrolysis.
- Sulfur from K2S04(ed) is not valid as the compound should be K2SO4(aq) and even then, it would produce oxygen at the anode instead of sulfur.
- Oxygen from H2SO4(aq) can be prepared through electrolysis, but this is not an element directly obtained from the compound.
Potassium from KCl(aq) can be prepared by electrolysis. During this process, K+ ions are reduced to potassium metal at the cathode, and Cl- ions are oxidized to chlorine gas at the anode.

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Answer:

The total pressure immediately after the volume reduction is 2.8 atmospheres

Explanation:

The question parameters are as follows;

The initial volume of the reaction vessel, V₁ = 1.00 L

The initial pressure of the reaction system, P₁ = 1.40 atm

The final volume of the reaction system, V₂ = 0.50 L

With the assumption that the gas mixture behaves as an ideal gas, and the temperature is constant, by Boyle's law we have;

P₁·V₁ = P₂·V₂

Where;

P₁ = The initial pressure in the reaction vessel

V₁ = The initial volume in the reaction vessel

P₂ = The total final pressure in the reaction vessel after the reduction in the vessel volume

V₂ = The final volume in the reaction vessel

∴ P₂ = P₁·V₁/V₂

From which we have;

P₂ = 1.40 atm × 1.00 L/(0.50 L) = 2.8 atm

The total final pressure in the reaction vessel, P₂ = 2.8 atm.

The wavelength of the photon absorbed when an electron in a hydrogen atom undergoes a transition from n = 1 to n = 3 is 1215 nm.

The Rydberg equation is given by:

1/λ = R(1/n₁² - 1/n₂²)

where λ is the wavelength of the photon absorbed or emitted, R is the Rydberg constant (1.0974 x 10⁷ m⁻¹), and n₁ and n₂ are the initial and final energy levels of the electron.

In this case, the electron in a hydrogen atom is undergoing a transition from n₁ = 1 to n₂ = 3, so we can substitute these values into the equation and solve for λ:

1/λ = R(1/1² - 1/3²)

1/λ = R(1 - 1/9)

1/λ = R(8/9)

λ = 1/(R(8/9))

λ = 1.215 × 10⁻⁷ m

To convert this to nanometers (nm), we multiply by 10⁹ nm/m:

λ = 1215 nm

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Answer:

The economics in costing​ is explained below in complete details.

Explanation:

The economic cost is the blend and mixture of wastes of any assets that have a worth connected to them by any one person. The economic cost is practiced largely by economists as a method to examine the prudence of one sequence of performance with that of another. The economic cost varies from accounting cost because it incorporates opportunity cost.

Answer:

I thing Calcium Perchlorate

Answer:

Runoff is water from precipitation that along with the ground level to water bodies while infiltration is water that seeps through into the soil and could possibly become groundwater.

Explanation:

Normally, where there are more cities and capitals and fewer trees, there would be more runoff and flooding would happen more frequently. In the countryside, there would be more trees and roots that would absorb the water from the soil and thus there would be more infiltration.

Answer: i dont know why the metal was chosen, but the original metal used on the statue of liberty was bronze :)

Explanation:

Answer:

There are 2.81 * 10^24 atoms present

Explanation:

To get this, we need to know the number of moles present in 140gramms of carbon.

Mathematically;

number of moles = mass/molar mass

molar mass of glucose is = 180 g/mol

So the number of moles will be ;

140/180 = 0.7778 mole

1 mole of glucose contains 6 moles of carbon;

so 0.7778 moles will contain = 4.667 moles

Mathematically, the number of atoms in 1 mole is 6.02 * 10^23 atoms

The number of atoms in 4.667 moles will be :

4.667 * 6.02 * 10^23 = 2.81 * 10^24 atoms