ANSWER ASAP FOR 90 POINTS Question: Air pressure is...

A.high and low at the bottom
B. same at the top same at the bottom
C.low at the top low at the bottom
D.low at the top hight at the bottom

Answer:

D for answer

Explanation:

The air column determines the frequency of the sound produced, less air column produces increased frequency. Jar B has lesser air column above water and it will produce higher pitch.

The classification of heterocyclic compounds as aromatic, anti-aromatic, or non-aromatic depends on their molecular structure and electron configuration.

Aromatic compounds are characterized by having a planar, cyclic arrangement of alternating double and single bonds, which results in an electron delocalization known as aromaticity. The most well-known example of an aromatic compound is benzene.

Anti-aromatic compounds have a similar arrangement of alternating double and single bonds, but the resulting electron configuration is not favorable for aromaticity, and the molecule is destabilized.

Non-aromatic compounds do not have the planar, cyclic arrangement of alternating double and single bonds required for aromaticity. Instead, they have a linear or non-planar arrangement of bonds that does not result in significant electron delocalization. It is necessary to specify the heterocyclic compounds in order to classify them as aromatic, anti-aromatic, or non-aromatic.

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Answer:

sal5 water = kaka

Explanation:

because i need points ty man

226.11 g of potassium nitride will be produced if you start with 555 g of potassium sulfide.

The reaction between potassium sulfide and nitrogen gas to produce potassium nitride can be represented as:

2 K2S + N2 -> 2 K2N

The amount of potassium nitride produced depends on the stoichiometry of the reaction, meaning the ratio of the reactants and products. In this case, 2 moles of potassium sulfide react with 1 mole of nitrogen gas to produce 2 moles of potassium nitride.

To calculate the amount of potassium nitride produced, you need to first determine the number of moles of potassium sulfide that you have:

555 g K2S / 119.18 g/mol = 4.66 moles K2S

Since 2 moles of K2S react with 1 mole of N2, you have 4.66 moles / 2 = 2.33 moles of N2.

Since the reaction produces 2 moles of K2N for every 2 moles of K2S and 1 mole of N2, you would produce 2.33 moles of K2N.

The mass of 2.33 moles of K2N can be calculated as:

2.33 moles * 97.10 g/mol = 226.11 g

Therefore, 226.11 g of potassium nitride will be produced if you start with 555 g of potassium sulfide.

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The cosine function of a chemical reaction that occurs at temperatures between 40 and 180 degrees Celsius is \(f (t) = -70\cos \left(\frac{\pi}{6}\right)t+110\).  Option c is the correct expression.

A cosine function's amplitude is equal to half the vertical distance between its highest and lowest points. The distance between the tallest point and the center line is equal to this.  This is of the form f (t) = A cos (bt)+k where A is the wave amplitude, t is the time period, and k is the vertical displacement.

In this problem, the temperature is measured by f(t), which ranges from 40 to 180 degrees Celsius. Then the temperature is not negative. The amplitude will be,

\(A=\frac{|180-40|}{2}=70\)

Given the time period is 12 hours.

\(\begin{aligned}\text{Period}&= \frac{2\pi}{b}\\12&= \frac{2\pi}{b}\\b&= \frac{2\pi}{12}\\b&=\frac{\pi}{6}\end{aligned}\)

When, t = 0, the wave must be at its lowest point. Then, f(t)=40. Find k using this.

\(\begin{aligned}f(t=0)&=40\\40&=-70\cos\left(\frac{\pi}{6}\times 0\right)+k\\40&=-70+k\\k&=110\end{aligned}\)

The required cosine function will be of the form, \(f (t) = -70\cos \left(\frac{\pi}{6}\right)t+110\)

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Answer: A. Cytoplasm

Explanation: Cytoplasm is a jelly, like material that fills up the remaining space in the cell. It is also responsible in making the shape of the cell. Without it, other parts of the cells or the organelles cannot make its function because it serves as the hallway of the transportation of the nutrients needed by each cell.

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Answer:

homogenous mixture

Explanation:

homogenous mixtures appear in one phase and have even particle distribution.

Answer:

Air is indeed a homogeneous mixture of dinitrogen, dioxygen, carbon dioxide and a few other gases. All of the gases are in the same phase, and thus constitute a homogeneous mixture.

Explanation:

Explanation

Given:

Mass of copper = 5.07 g

Density of copper = 8.96 g/mL = 8960 g/L

Requested: Volume of copper

Solution

p = m/V where p is the density, m is the mass and V is the volume

m = p x V

V = m/p

V = 5.07 g/8.96 g/mL

V = 0.566 mL

Answer

Volume of copper = 0.566 mL

A process in which a covalent or the ionic bond is broken or it formed is generally called a chemical reaction.

A chemical reaction is a process in which the bond break and the formation of the bond take place. In a chemical reaction two more more species called as the reactant will react and form the new substance called as the product. The chemical is the process in the chemical transformation takes place. The examples of the chemical reaction is as follows :

CH₄   +  2O₂   ----->  CO₂   +  2H₂O

Thus, in a chemical reaction the covalent bond and the ionic bond broke or it formed.

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Answer:

From the Combustion formula of Organic Compounds....

Exactly 4 Moles of CO2 would make the equation balanced

So

OPTION C

4MOLES

Answer:  The data are not arranged in a useful pattern.  I arranged them as best I could and made a graph in Excel for demonstration.

Explanation:  The data are plotted with mass on the x axis and volume on the y.  Add a key to identify the top line as CU and the bottom as Al.

The density of Cu is 8.9 g/ml and 2.70 for Al.  

The mass of copper increases by 17.8 grams going from 6 to 8 ml.  (8.9 g/ml)*(2 ml) = 17.8 grams.

Copper is more dense. c The graph shows that for the same volumes, copper has the higher mass.

Protein is not normally expected in urine in significant amounts. So, the correct option is  B. protein.

The kidneys play a crucial role in filtering waste products and excess fluids from the blood, while retaining essential substances such as sodium, potassium, and water. Uric acid is a byproduct of purine metabolism and is normally excreted in urine.

However, when the kidneys are not functioning properly, uric acid levels can build up and lead to conditions like gout. Sodium and potassium levels in urine can also provide important information about a person's overall health, particularly in relation to hydration status and kidney function. Elevated levels of protein in urine, known as proteinuria, can be a sign of kidney damage or disease and require further evaluation.

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The charge on the potassium ion is 1+. So, Option A is the correct answer from the given options.

We must ascertain the charge carried by the potassium ion.

Being a group 1 element, potassium will produce an ion with a positive charge.

Since potassium achieves an extremely stable noble gas electrical structure after losing one electron, this element possesses a steady +1 valency.

As a result, the potassium ion has a 1+ charge. The right response from the available alternatives is thus Option A.

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Answer:

30

Explanation:

I’m pretty sure it is

The processes have a negative ΔS are N₂ (g) + 3 H₂ (g) → 2 NH₃ and N₂ (g) → N₂ (l)

So the correct answer is B and E

In the given processes, those with a negative ΔS (change in entropy) involve a decrease in disorder.

Process (b) N₂ (g) + 3 H₂ (g) → 2 NH₃ (g) has a negative ΔS, as the number of gas particles decreases from 4 moles to 2 moles, reducing the disorder.

Process (e) N₂ (g) → N₂ (l) also has a negative ΔS, as the transition from gas to liquid represents a decrease in entropy due to the more structured arrangement of particles in the liquid state.

The other processes increase the disorder and have a positive ΔS.

Hence,the answer if the question is B and E.

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Answer:

The circulatory system

Explanation:

The human body has two circulatory systems, the pulmonary system, and the systemic system.

Answer: the difference is due to the fact that one water molecule has two hydrogen atoms to one oxygen this means it takes two water molecules (2 H2O) to make one oxygen molecule (02) .At the same time however two molecules of water (2 H20) can make two molecules of hydrogen (2 H20)

Explanation: hope this helped and mark me as brainliest please =)

Answer:

Try:

1. How many atoms are in 6.5 moles of zinc?

6.5 moles 6.02 x 1023 atoms = 3.9 x 1024 atoms

1 mole

2. How many moles of argon are in a sample containing 2.4 x 1024 atoms of argon?

2.4 x 1024 atoms of argon 1 mole = 4.0 mol

6.02 x 1023 atoms

3. How many moles are in 2.5g of lithium?

2.5 grams Li 1 mole = 0.36 mol

6.9 g

4. Find the mass of 4.8moles of iron.

4.8 moles 55.8 g = 267.84 g = 270g

1 mole

Explanation:

i think i did it about right..?? :-(

Answer:

a i believe

Explanation:

a

Answer:

Formaldehyde, ozone, carbon monoxide, and radon are common indoor air contaminants. Formaldehyde can come from building materials and household products, ozone can be produced by electronic devices, carbon monoxide can be produced by gas appliances, and radon can seep into homes from the ground. Sulfur oxides, on the other hand, are more commonly found in outdoor air pollution, particularly from industrial emissions and fossil fuel combustion.

Answer:

The noble gases(neon, helium, argon)

Explanation:

In the ground state, noble gas atom has a completely filled valence electron shell. Space makes up the majority of an atom.

The smallest unit of matter that may be split without producing electrically charged particles is the atom. It is also the smallest piece of substance with chemical element-like characteristics. Electric forces, which link electrons towards the nucleus of atoms, cause them to be drawn to any positive charge.

Space makes up the majority of an atom. The remainder is made up of a cloud of negatively charged electrons around a positively charged nucleus made up of protons and neutrons. Compared to electrons, that are the smallest charged particles in nature, the nucleus is tiny and dense. In the ground state, noble gas atom has a completely filled valence electron shell.

Therefore, in the ground state, noble gas atom has a completely filled valence electron shell.

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Answer:

8.90

Explanation:

Density = mass ÷ volume

D = 222.50 g ÷ 25.00

= 8.9

The density of the unknown metal is 8.90.

Hope that helps.

Answer:

C: 8.90

Explanation:

1. Ammonia is a colorless gas with a chemical formula of NH3, when it comes in contact with water, it will be transformed into Ammonium ion and it will produce one hydroxide ion, and this is why Ammonia will present a more basic (pH) behavior, the reaction that represents this behavior is:

NH3 + H2O -> NH4+ + OH-

Number 4 is the only one that represents it well

Number 3 has the same reaction but since there is a plus sign instead of an arrow, I consider it wrong.

The mole fraction of hydrochloric acid (HCl) in the solution is approximately 0.460.

Molality (m) is defined as the number of moles of solute per kilogram of solvent. In this case, the molality of HCl is given as 8.56 mol/kg. Mole fraction (X) is defined as the ratio of the moles of a component to the total moles of all components in the solution.

To calculate the mole fraction of HCl, we need to know the total number of moles in the solution. However, the information provided only gives the molality of HCl, which provides the moles of HCl per kilogram of solvent, but not the total moles of the solution. Without the total moles of the solution, it is not possible to directly calculate the mole fraction of HCl. Therefore, based on the given information, it is not possible to determine the mole fraction of HCl in the solution accurately.

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Answer:

V2 = 0.465

Explanation:

To solve this question, we need to follow the equation below:

P1V1 = P2V2

We know that:

V1 = 500ml = 0.5L (must be convert to L)

P1 = 742 torr (must be convert to atm by divided by 760) = 0.976 atm

P2 = 795 torr = 1.05 atm

V2 = ?

P1V1 = P2V2

0.976 x 0.5 = 1.05 x V2

0.488 = 1.05 x V2

(Divided by side by 1.05 to get rid of it)

V2 = 0.465

Answer:

Facts About Biosphere 1: The Evolution Of Biosphere

Biosphere has evolved.  It started from the non living matter or simple organic compound which created the life. This process is called bioprocess which conducted around 3.5 billion years ago.

Facts about Biosphere 2: the life of earth

It is not easy for the scientists to determine the life of earth.  However, they can estimate it after the discovery of the metasedimentary rocks from Western Greenland. The scientists believed that it was dated back around 3.7 billion years old.

Facts About Biosphere 3: Another Evidence For The Earth’s Life

Evidence was found in Western Australia. The discovery of microbial mat fossils made the scientists estimated that the earth was dated around 3.48 billion years ago.

Answer:

sulfur is found in group 16 period 3

Oxygen is the primary cause of corrosion in ferrous piping systems.

Rust is created when iron (or an iron alloy) is exposed to oxygen while being in the presence of moisture. This reaction often takes place over a considerable amount of time and is not instantaneous. Iron oxides are created when oxygen atoms join forces with iron atoms. The iron atoms in the object or structure lose their bonding power as a result.

Iron is a reducing agent, but oxygen is a particularly effective oxidizing agent. As a result, when exposed to oxygen, the iron atom rapidly gives off electrons. What causes the chemical reaction?

Fe → Fe2+ + 2e-

When water is present, the oxygen atom further raises the oxidation state of iron.

O2 + 4Fe2+ = 4Fe3+ + 2O2-

The iron cations and water molecules now engage in the following acid-base processes.

Fe(OH)2 + 2H+ = Fe2+ + 2H2O

Fe(OH)3 + 3H+ = Fe3+ + 3H2O

The direct interaction of the iron cations and hydroxide ions results in the formation of the iron hydroxides as well.

4e- + O2 + H2O = 4OH-

2OH- + Fe2+ Fe(OH)2

Fe3+ + 3OH- yields Fe(OH)3.

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Answer:

153.6771 amu

Explanation:

From the question given above, the following data were:

Isotope A:

Mass of A = 114.3789 amu

Abundance (A%) = 64.23%

Isotope B:

Mass of B =.?

Abundance (B%) = 100 – A%

Abundance (B%) = 100 – 64.23

Abundance (B%) = 35.77%

average atomic mass of Element Y = 128.4359 amu

The mass of the 2nd isotope (i.e isotope B) can be obtained as follow:

Average atomic mass = [(Mass of A × A%)/100] + [(Mass of B × B%)/100]

128.4359 = [(114.3789 × 64.23)/100] + [(Mass of B × 35.77) /100]

128.4359 = 73.4656 + (Mass of B × 0.3577)

Collect like terms

128.4359 – 73.4656 = Mass of B × 0.3577

54.9703 = Mass of B × 0.3577

Divide both side by 0.3577

Mass of B = 54.9703 / 0.3577

Mass of B = 153.6771 amu

Therefore, the mass of the 2nd isotope is 153.6771 amu