list two reasons why atmospheric pressure changes ​

Explanation:

the answer is letter A. mitosis

The villi are associated with the small intestine and function in absorption.

What are Villi?Villi are tiny finger-like projections that protrude from the inner lining of the small intestine. Their primary function is to increase the surface area of the small intestine and increase the absorption of nutrients.

What are the functions of the small intestine?The small intestine is the primary site for digestion and absorption. The majority of nutrient absorption takes place in the small intestine. The small intestine is divided into three parts: the duodenum, the jejunum, and the ileum. Food from the stomach is mixed with digestive enzymes and bile in the duodenum.

Most of the nutrients and water are absorbed in the jejunum and the ileum. The small intestine also absorbs vitamins, minerals, and water.The villi are critical for the small intestine's absorptive capacity because they greatly increase the surface area available for absorption. The villi are covered with microvilli, which are even smaller projections that increase the surface area even more.

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The parts per million (ppm) iron in the water is 108.31.

Parts per million (ppm) is a notation used to describe the amount of a substance (usually very small) in a solution. It means part of a million and in chemistry, it is usually expressed as milligrams per liter (mg/L).

ppm = mass of substance/liter of solution

Convert the given mass of precipitate formed (Fe₂O₃) into moles.

moles Fe₂O₃ = mass Fe₂O₃/ MW Fe₂O₃

moles Fe₂O₃ = 0.1084 g/ 159.69 g/mol

moles Fe₂O₃ = 6.788 x 10⁻⁴

In 1 mole of Fe₂O₃, there are 2 moles of Fe. Hence, there are 1.35 x 10⁻³ moles Fe.

1 mole of Fe₂O₃ : 2 moles of Fe = 6.788 x 10⁻⁴ : 1.35 x 10⁻³

Convert the calculated moles of Fe into mass.

mass Fe = MW Fe x moles Fe

mass Fe = (55.847 g/mol)(1.35 x 10⁻³ mol)

mass Fe = 0.0758 g

Divide the mass of iron (Fe) with the volume of solution to get the ppm.

ppm = mass of substance/liter of solution

ppm = (0.0758 g)(1000mg/g) / (700.0 mL)(L/1000mL)

ppm = 108.31

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The S6 (S2n) axis, which coincides with the C3 axis, and staggered ethane both have incorrect rotation axes. Cn stands for the correct rotation's 360/n-degree rotation about the axis. The C5 primary rotation axis of eclipsed ferrocene has five C2 axes that are perpendicular to it. S10 has an incorrect rotating axis.

With the chemical formula C 2H 6, ethane is an organic chemical substance. Ethane is a colourless and odourless gas at ordinary temperature and pressure. Fe(C5H5)2 is the formula for the organometallic compound ferrocene. The molecule is a complex made up of a core iron atom and two cyclopentadienyl rings.

The S6 (S2n) axis, which coincides with the C3 axis, and staggered ethane both have incorrect rotation axes. Ferrocene has an S10 incorrect rotation axis and is staggered. Ethane that is staggered belongs to the D3d point group. Cn stands for the appropriate rotation in staggered ethane, which is rotation about axis by 360/n degrees. The C5 primary rotation axis of eclipsed ferrocene has five C2 axes that are perpendicular to it. It belongs to the D5d point group as a result.

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Answer:

The lung

Explanation:

The model of the respiratory system made by Megan consists of two balloons. The first balloon stretched across the bottom of the bottle represents the diaphragm which contracts and relaxes to allow air in and out of the lungs. The balloon inside the bottle represents one lung.

Breathing in causes the balloon inside the bottle to be filled with air. This is preceded by the expansion of the diaphragm which makes the lungs to be filled with air. Breathing out causes a contraction of the diaphragm thus making the lungs to let out air.

Answer:

You're Lungs

Explanation:

When you breathe in, air flows into your lungs. When you breathe out, air flows out of your lungs. The balloon inside the bottle is like one of your lungs.

Answer:

The independent variable in this experiment is what he feeds the chickens (rice or corn).

Explanation:

The independent variable is the variable the experimenter manipulates or changes.

They have same mass

Explanation:

If you think wisely 100 pounds and 100 pounds have the same weight so the answer is equal

Answer

Explanation:

Magnesium Oxide has a formula of MgO.

Magnesium has a molar mass of 24.30g/mol and Oxygen has a molar mass of 15.99g/mol.

From this, we can say we are assuming a 1 mole sample of magnesium oxide, as the stoichiometric coefficients will always be the same, as will the ratio of oxygen to magnesium.

From this,

\(15.99g/mol *1 mol MgO = 15.99 gOxygen\\24.30g/mol *1molMgO=24.30gMagnesium\\Oxygen mass percent = 15.99/(15.99+24.30) = .396\)

The Magnesium equation will be the same but a different numerator. Notice, if there were different coefficients on the elements, you would have to multiply by the stoich coefficient.

Answer:

True

Explanation:

The mass of an object is always equal to the sum of its parts. ... Weight is a measure of the pull of gravity on an object's mass. The mass of an object is the same on Earth as it is on the moon, but the weight of the same object will be less on the moon than on Earth because there is less gravitational force on the moon.

Answer:

14.594% Iron and 85.406% Sulfur

Explanation:

103g (S) + 17.6g (Fe) = 120.6g total mass

103/120.6 × 100 = 85.406% Sulfur

17.6/120.6 × 100 = 14.594% Iron

Answer:

jst do the work

Explanation:

its not complicated,ask your teacher for help

The ratio strength (w/v) of the diluted solution is 1:1000 or 0.1% w/v.

The original solution is a 1:20 w/v solution, which means that for every 1 gram of solute, there is 20 mL of solution. Using this information, we can calculate the amount of solute in the original 50 mL of solution:

1 gram / 20 mL = x grams / 50 mL

x = 2.5 grams of solute

When this 50 mL of solution is diluted to 1000 mL, the amount of solute remains the same, but the volume of the solution increases. The new ratio can be calculated by dividing the weight of the solute by the volume of the solution:

2.5 grams / 1000 mL = 0.0025 grams/mL

Converting this to a percentage w/v:

0.0025 grams/mL x 100 = 0.25% w/v

Therefore, the ratio strength is 1:1000 or 0.1% w/v.

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The correction options are;

The number of bonds each atom makes to surrounding atoms contributes to the substance strength, the strength of a bond between two atoms increases as the number of electron pairs in the bond increases. Thus, we find that triple bonds are stronger and shorter than double bonds between the same two atoms; likewise, double bonds are stronger and shorter than single bonds between the same two atoms.

The crystal structure of a substance can contribute to its strength as it was found that the body-centered-cubic crystal structure is always the softer structure when it is involved in an allotropic transformation. The close-packed and more complex structures are inherently harder, and may be expected, therefore, to be better base materials for high strength alloys.

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Water has a higher boiling point than ethanol because of stronger intermolecular forces. The correct option is b.

The boiling point of water is 100°C, while the boiling point of ethanol is 78.5°C. Intermolecular forces are the attractive forces that occur between molecules. The higher the intermolecular forces, the higher will be the boiling point of the substance.

              This is because a higher amount of heat energy is required to overcome the intermolecular forces and convert the substance from a liquid state to a gaseous state. Water molecules are polar in nature and are strongly attracted to one another by hydrogen bonding.

                Hydrogen bonds occur between a slightly positive hydrogen atom and a slightly negative oxygen atom in neighboring molecules. Ethanol molecules are also polar and have hydrogen bonding but these interactions are not as strong as in water molecules. The polar nature of the water molecule makes it difficult to break the intermolecular hydrogen bonds and hence a higher boiling point.

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a) The volume of the reactor V0 using the mass balance equation and then use the rate of reaction equation to calculate the reactor size is 66.67 ft³ b) 10 reactors are required for the process to be arranged in series.

Given information:
Rate of feed =100 cfh
Cso=1.5 lbmol/ft³
Forward reaction rate, k=10
Equilibrium constant, Ke=16
Equilibrium conversion= 80%
CT=CU= ½(1.5-CS)
-rS=k[(Cs)² – 0.25(1.5-Cs)²/ke]a) Reactor size calculation:

Let’s use the mass balance equation for the process taking place in the Continuous Stirred Tank Reactor,

Therefore, F = V_0 (C_s)_o

Where, F is the flow rate

V_0 is the volume of the reactor(C_s)_o is the concentration of the reactant initially

This is a reversible reaction that occurs in a Continuous Stirred Tank Reactor or a CSTR. It follows the reaction equation of 2S ⇆ T+U .

Using equilibrium data, we know that the required conversion is 80%. That is, Xeq=0.8Using the equilibrium data equation, we can relate the concentrations of T, U, and S as follows:

[T][U]/[S]²= Ke=16Where,[T], [U] and [S] are the molar concentration of the respective species.

Now, let's use the rate equation for the forward reaction to relate the concentration of S to the rate of the reaction.-r_S=k[(C_S)²-0.25(1.5-C_S)²/Ke]

Now, applying the steady-state assumption, dC_S/dt=0, and considering the fact that CT=CU=0.5(1.5-CS), we can substitute (C_S) with C_T and simplify the rate equation.-r_S=k[((C_T)²-0.25(1.5-C_T)²/Ke)]

Now we can calculate the rate of reaction from the rate equation.

-r_S=k[((C_T)²-0.25(1.5-C_T)²/Ke)]=k[((0.5(1.5-C_T))²-0.25(1.5-0.5(1.5-C_T))²/Ke)]

We can find the volume of the reactor V0 using the mass balance equation and then use the rate of reaction equation to calculate the reactor size.

Therefore,V0=F/(C_S)_o=100/(1.5)=66.67 ft³

So, the reactor size is 66.67 ft³.b) For a given feed rate and the size of the reactors, we can calculate the number of reactors required for the process to be arranged in series using the following equation: N=V1/V2

where, V1 and V2 are the volumes of the reactor in the series.

So, if we want to design an arrangement of vessels having 1/10 the size, we can calculate the size of each reactor in the series.V2=V1/10=6.667 ft³

Now, we can find the number of reactors using the equation: N=V1/V2=66.67/6.667=10

Thus, 10 reactors are required for the process to be arranged in series.

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Isolationism is not associated with the rise of globalization. Globalization is the term used to describe the increasing interconnectedness and interdependence of countries, companies, and people around the world.

It encompasses economic, cultural, social, and political aspects, and its definition can vary depending on one's perspective. Globalization refers to the growing integration and interdependence among nations and the intensification of global interactions.

On the other hand, isolationism refers to a country's desire to remain self-sufficient and detached from international affairs. Isolationist countries aim to focus on their domestic concerns and avoid involvement in global conflicts, trade, and cultural exchange. It represents a disengagement from international interactions and stands in contrast to globalization.

Globalization has led to greater cultural exchange, technological advancements, and increased international trade. However, isolationism goes against the principles of globalization as it involves withdrawal and limited engagement with the global community. Therefore, isolationism is not associated with the rise of globalization.

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Answer:

273.6 g

Explanation:

mass =(density)(volume)

mass=(5.7g/cm^3 )(48 cm^3)

cancel out your cm^3 and your are left with grams

multiply (5.7g)(48)=273.6 g

The mass of an object with a density of 5.7 g/cm³ and a volume of 48 cm³ is 273.6 grams.

Density is defined as the degree to which a material is packed together.

It is also defined as a mass per unit volume of the substance.

Its SI unit is kilogram per cubic meter or  gram per meter.

Density can be expressed as

Density = mass / volume

Mass =  density x volume

As given, Density = 5.7 g/cm³

                Volume = 48 cm³

So, Mass =  5.7 g/cm³ x  48 cm³

               =  273.6 grams

Thus, the mass of an object with a density of 5.7 g/cm³ and a volume of 48 cm³ is 273.6 grams.

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All the units listed in the question can be valid units for a reaction rate, except for the unit of grams per second (g/s). Reaction rate is defined as the change in concentration of a reactant or product per unit time. It is usually expressed in units of mol/L-time, where time can be in seconds, minutes, or hours.

The unit of M/s (molarity per second) is often used for expressing the reaction rate, especially in kinetics studies. The unit of mol/L-hr (molarity per hour) is also a valid unit for expressing the reaction rate, as it represents the change in concentration per unit time.

The units of mol/hr (moles per hour) and mol/L (molarity) are also used to express the reaction rate. However, the unit of g/s is not a valid unit for a reaction rate, as it represents the mass of a substance per unit time, rather than the change in concentration per unit time.

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At standard pressure, the volume is 490 ml.

Boyle's law is used in this situation: P1V1 = P2V2. Volume and pressure need not be converted to standard forms. Even the pressure in mmHg might be used.

1 atm equals 760 mmHg

V2 = P1V1V1 / P2 = 745 x 500 / 760 = 490 ml

Keep in mind that we are assuming a constant temperature here.

An object that has neither a set size nor shape is a gas. A gas will expand to fill the space inside a tightly closed container. The air that you breathe is a type of gas.

The main component of natural gas, methane, is a colorless, gaseous combination of hydrocarbons (CH4). It makes up around 30% of the energy consumed in the US.

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Answer:

Physical state of reactants

Temperature

Concentration of reactants

Presence of a catalyst

Explanation:

The larger the surface area of a reactant, the faster the rate of the reaction. If the reactant is in powdered form, the reaction takes place faster than when the reactant is in solid or block form. This is due to the fact that the latter has larger surface area

Increase in temperature causes reactant molecules to gain kinetic energy thus increasing the rate if reaction

When a sodium atom transfers an electron to a chlorine atom, a chemical reaction occurs resulting in the formation of a sodium ion (Na+) and a chloride ion (Cl-).

This process is known as ionic bonding and is the result of the transfer of electrons from sodium to chlorine.

The reaction does not produce a new chemical compound or molecule, as this would require the combination of the two atoms with something else (e.g. oxygen, hydrogen, etc.).

This means that the reaction is not a chemical reaction, and so does not produce a new chemical compound or molecule.

In summary, when a sodium atom transfers an electron to a chlorine atom, ionic bonding occurs and the result is the formation of a sodium ion and a chloride ion. This process does not produce a new chemical compound or molecule.

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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:4

A 1 mol sample of zinc can reduce the greatest number of moles of ion Al3+.

To determine which ion can be reduced by the greatest number of moles by 1 mol of zinc, we need to consider the stoichiometry of the redox reactions involved.
For the given ions, the redox reactions are as follows:
Zn + 2Al3+ → Zn2+ + 2Al
Zn + Pb2+ → Zn2+ + Pb
Zn + 2Ag+ → Zn2+ + 2Ag

From these reactions, we can see that 1 mol of zinc can reduce:
2 moles of Al3+ (reaction a)
1 mole of Pb2+ (reaction b)
2 moles of Ag+ (reaction c)
Comparing the number of moles reduced in each reaction, we find that 1 mol of zinc can reduce the greatest number of moles of Al3+ (2 moles).

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Answer:

11.5

Explanation:

1 mole of Na has 6.022 × 10^23

so 6.95 x 10^24 / 6.022 × 10^23 = 11.5 moles

Answer:

A substance that has a fixed chemical composition throughout is called a pure substance such as water, air, and nitrogen. A pure substance does not have to be of a single element or compound.

Explanation:

Compound: A substance that contains more than one element

pure substance: is made up of one substance made up of only one type of molecule

Two moles or 36 g of water on decomposition gives 32 grams of oxygen gas. Then 494 g of water will give 439 g of oxygen.

The decomposition is a type of reaction in which a single compound breaks into its constituent elements or molecules. Water molecules are formed by the combination of hydrogen and oxygen atoms.

Decomposition of two moles of water  decompose to give 2 moles of hydrogen gas and one mole of oxygen gas.

molar mass of water = 18 g/mol

molecular mass of oxygen  = 32 g/mol

Two moles or 36 g of water gives one mole or 32 g of oxygen gas. Then mass of oxygen produced by 494 g of water is :

(494 ×32)/36 g = 439 g

Therefore, 439 g of oxygen gas is formed by the decomposition of 494 g of water.

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