Which of the following provides the best evidence that organ systems in the human body interact with one another

Answer:

Neon and lithium.

Explanation:

4x = 79.9 atomic mass

x = 19.98 atomic mass

The element having the nearest atomic mass to 19.98 is neon with an atomic mass of 20.180.

==

8y = 2*(28.085)

8y = 56.17

y =  7.021

The element having the nearest atomic mass to 7.021 is lithium with an atomic mass of 6.94..

Answer:

Explanation:

London dispersion forces would be the only intermolecular force holding two methane molecules together.

The least powerful intermolecular force is the 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.

Argon, hydrogen gas, fluorine gas, and methane are non-polar particles that solely have London dispersion forces between their atoms or molecules.

When molecules and/or ions are sufficiently close to one another, it is presumed that these dispersion forces exist between all of them. It is believed that ions and dipoles produce stronger, farther-reaching electrical forces that work in addition to those already mentioned.

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The atomic mass of silicon is calculated to be 28.1087 amu if the three isotopes have relative abundances of 92.23%, 4.67%, and 3.1%, respectively.

The atomic mass of an element can be determined by first changing the percentage abundance of each isotope into decimal form, then multiplying this value by the atomic mass of that isotope. Then the resultant value of each isotope is added together to get the atomic mass of the element.

As the mass of the three isotopes of silicon is 28 amu, 29 amu, and 30 amu  with relative abundances of 92.23%, 4.67%, and 3.1%, respectively, we can calculate the atomic mass of silicon as follows;

si-28 = 92.23% = 92.23/100 = 0.9223

si-29 = 4.67% = 4.67/100 = 0.0467

si-30 = 3.1% = 3.1/100 = 0.031

Now multiplying these values by the atomic mass;

si-28 = 0.9223 × 28 = 25.8244

si-29 = 0.0467 × 29 = 1.3543

si-30 = 0.031 × 30 = 0.93

Now adding these values together;

atomic mass of silicon = 25.8244 + 1.3543 + 0.93

atomic mass of silicon = 28.1087 amu

Therefore; the atomic mass of silicon is calculated to be 28.1087 amu.

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Answer: 4.3

Explanation:

You read from the bottom of the meniscus and each line equals .1 so it reads 4.3.

New crust is found at the center of the mid-ocean ridge, proving the movement of the seafloor and the surface of the Earth and is denoted as option D.

These are structures which are formed where two tectonic plates are spreading apart and therefore forms the seafloor which is present in larger types of water bodies such as sea, oceans etc.

There is also the presence of new crust at the center and it helps to prove movement of the surface of the earth which is therefore the reason why it was chosen as the correct choice.

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Option C ;(NH4)2SO4 is the formula for ammonium sulfate.

It is an inorganic salt. It appears as fine white crystals. Its molecular weight is 132.14g/mol. Its density is 1.77g/cm³.It has many commercial uses. It is mainly used as fertilizer for alkaline soils because ammonium ions forms small amounts of acid which lowers the pH of the soil.

It is acidic with pH of 5.5. Its melting point is 235 °C. it is soluble in water. It is obtained by the reaction of sulfuric acid with ammonia. Sulfuric acid will react with two equivalents of ammonia.

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Answer:

C. (NH4)2SO4

And the second question is

A. KOH

Explanation:

Mendelevium and californium , both synthesize differently because Mendelevium is a synthetic element and californium is a radioactive chemical element.

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In the sample of soluble iodide, 0.7183 grams iodine are present.

To find the concentration of iodine in grams we must known about molar mass of Silver and molar mass of Iodine.

Molecular weight of Ag = 107.86

Molecular weight of I = 126.90

Molecular weight of  = 107.86 + 126.90 = 234.76

Percentage of I in [tex]AgI[/tex] is = (126.90/234.77) x 100 = 54.05%  

 so  we can convert percentage of Iodine in silver iodide into grams by using formula percentage of Iodine/100x grams of silver Iodide.

so,Concentration of Iodine in grams=[tex]\frac{54.05}{100}[/tex]×1.329

                                                           =0.5405x1.329

                                                            =0.7183g

1.329g of [tex]AgI[/tex] contains 0.7183g of iodine in soluble Iodide.

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The balloon and the comb definitely have the same electrical charge. Option 2.

According to the law of attraction in physics, like charges repel while unlike charges attract.

Going by this law:

In other words, if 2 objects that have the same charges are brought close to each other, there will be a repulsion. If the 2 objects are of different charges, there will be an attractive force between them.

The students observed that the comb repelled the balloon. The implication is that the comb and the balloon are of the same charge.

This is logical considering the fact that both objects were rubbed against hair. They got their charges during the process of rubbing. An electrostatic force is generated that moves electrons from the hair to the two objects.

Thus, both the balloon and the comb are negatively charged and will, therefore, repel each other.

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The pressure of a gas at a constant temperature in a sealed container will gradually decrease. Option C.

Gases are made up of particles molecules or atoms in constant random motion. Gas particles constantly collide with each other and with the walls of the container. These collisions are elastic. That is, there is no net energy loss due to collision. The pressure of a constant temperature gas in a closed container gradually decreases.

The above statement is incorrect because the pressure of a gas at a constant temperature depends on the volume of the gas. If the container is sealed, the volume of gas is also constant. Collisions are completely elastic. When two molecules collide, they change direction and kinetic energy, but all kinetic energy is conserved. Collisions are not sticky. The average kinetic energy of gas molecules is directly proportional to absolute temperature.

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Answer:

The easiest way to find the number of neutrons, protons, or electrons is to look at the element's atomic number on the periodic table, that number is equal to the number of protons. Which is equal to the number of electrons unless there's an ion superscript listed after the element.

Explanation:

Have a great rest of your day
The one and only,
-Mr. Universe

Answer:

CaCO3

Explanation:

Pure calcite has the composition CaCO3. However, the calcite in limestone often contains a few percent of magnesium. Calcite in limestone is divided into low-magnesium and high-magnesium calcite, with the dividing line placed at a composition of 4% magnesium. High-magnesium calcite retains the calcite mineral structure, which is distinct from that of dolomite, MgCa(CO3)2.[18] Calcite can also contain small quantities of iron and manganese.[19] Manganese may be responsible for the fluorescence of impure calcite, as may traces of organic compounds

The gas constant is equal to R=8.314 J/mol K, while the atomic mass of helium is equal to M=4.0 g/mol. M = 4.0 g / m o l . As a result, the helium atom's rms speed is 1304.7 m/s. So, 515 m/sec is the root-mean-square speed.

The value of the square root of the sum of the squares of the stacking velocity values divided by the quantity of values is the root-mean square (RMS) velocity. The RMS velocity is the speed of a wave traveling along a certain ray path across subsurface strata with various interval velocities.

The expression v=sqrt(3RTM) and v=sqrt(3KTm), where R is the universal gas constant, T is the absolute (Kelvin) temperature, m is the molar mass, K is the Boltzmann's constant, and M is the molecular mass, gives the root mean square (R.M.S.) speed V of the molecules of an ideal gas.

Since the particles in a typical gas sample are flowing in all directions, the average velocity for that sample is zero, which is why we use the rms velocity instead of the average. This is an important formula since the particle velocity controls both the diffusion and effusion rates.

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This canyon is an example of how the surface of Earth changes slowly due to the slow and gradual process of erosion by water and wind.

The slow and gradual process of erosion by water and wind is responsible for the slow change in the surface of Earth demonstrated by the canyon.

The canyon demonstrates how the surface of Earth changes slowly due to the process of erosion by water and canyon, which gradually wear away the rock and reshape the landscape over millions of years.

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In the chemical reaction between Fe(II) ions and dilute sulfuric acid when hydrogen peroxide is added Fe(II) gets converted to Fe(III) ,on retaining mixture and adding NaOH precipitate of ferric hydroxide is obtained.

Chemical reactions are defined as reactions which occur when a substance combines with another substance to form a new substance.Alternatively, when a substance breaks down or decomposes to give new substances it is also considered to be a chemical reaction.

There are several characteristics of chemical reactions like change in color, change in state , change in odor and change in composition . During chemical reaction there is also formation of precipitate an insoluble mass of substance or even evolution of gases.

There are three types of chemical reactions:

1) inorganic reactions

2)organic reactions

3) biochemical reactions

During chemical reactions atoms are rearranged and changes are accompanied by an energy change as new substances are formed.

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The mass percent of the salt is 33.33%

The percentage of a solution's mass that is made up of solutes is known as the mass percent. This percentage is measured in relation to the total mass of the solution.

The term "mass percent composition" also refers to weight percentage. It is referred to as w/w%. The formula for mass percent in a solution is the mass of an element in one mole of the compound divided by the compound's molar mass, then multiplied by 100%.

Total mass of solution = 75g

The mass percent of the salt= 25/75×100%

The mass percent of the salt= 33.33%.

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Answer: Should actually be Calcium Sulfide

Explanation: Alkali metal + non metal = salt.

2nd element in compound should either end in -ide or

Density of a substance is the ratio of its mass to volume. Specific gravity of the substance is the ratio of its own density to the density of water. Thus, dividing its density by density of water.

Specific gravity of an object is the ratio of its density to the density of water. In fact it is related to the gravity itself in water. This ratio determines whether the object float or sink to the bottom of water.

If the specific gravity is greater than one, which means the object is denser than water and it will sink to the bottom of water because of its weight. If the specific gravity is less than one, then the object have less density than water and it will float on water.

All the floating objects have a specific gravity of less than one. Irrespective of the weight of the objects they floats because of their higher density than water.

Ice floats on water where a stone will sink. Similarly large ships, canoes etc are floating because of their smaller specific gravity. This way we can compare the floating property using specific gravity.

Therefore, specific gravity of a substance can be found by dividing its density by the density of water.

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Answer:

The Earth's Crust is like the skin of an apple. It is very thin in comparison to the other three layers. The crust is only about 3-5 miles (8 kilometers) thick under the oceans(oceanic crust) and about 25 miles (32 kilometers) thick under the continents (continental crust).

Explanation:

you butt is thick in kilometers

;)

Answer: The part I think you messed up on is the atoms not all of them have 0 and 1. Sodium Chloride has 2 atoms. Other than that it looks amazing! Hope this helps!

As a result, it is a natural bodily alteration. The chemical shape of the material is affected by physical changes, but not its makeup.

Since natural water undergoes a phase transformation cycle from liquid to gas and back to liquid, the production of clouds is a physical shift.

The physical conversion of water from vapour to liquid during cloud formation is known as condensation. When water evaporates during the evaporation process and condenses in the air to form clouds, there is a physical shift that takes place.

Condensation is the process by which water transforms from a gas to a liquid, whereas deposition is the process by which a gas transforms straight into a solid. Clouds are created by these two processes.

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A process through which a large molecule such as a protein could leave the cholera cell is generally referred to as: c) exocytosis.

Cholera can be defined as a type of disease which is typically caused by a bacteria that is referred to as Vibrio cholerae. Also, cholera gets into the body of a living organism through an ingestion of contaminated food or water.

Exocytosis simply refers to a process which typically involves a cell releasing a large amount of a material (bulk transport) outside of the cell, especially through the use of vesicles.

This ultimately implies that, exocytosis can be defined as a biological process in which living organisms release (expel) large amount of unwanted material by using the vesicles.

Additionally, exocytosis is a biological process that is initiated by the Golgi apparatus and it can be used to expel a large molecule such as protein from cholera cells.

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Complete Question:

In the first stage of cholera, the bacterium finds a host cell in the small intestine. The bacterium then releases toxic proteins called toxins near the host cell. Through which process could a large molecule such as a protein leave the cholera cell?

a) osmosis

b) diffusion

c) exocytosis

d) endocytosis

Answer:

Element XX has a relative atomic mass of 6.86 aum

Explanation:

See attached worksheet.

Answer:

Explanation:1 g CH

4

​

,C

2

​

H

6

​

C

3

​

H

8

​

C

4

​

H

10

​

T = 350 K, P = 1 atm

PV=nRT=

M

w×R×T

​

1×V=

58

1

​

×0.0821×350

V=0.495 L

V=495cm

3

There would be seven peaks if you could observe them all while considering no decomposition of the ion into smaller fragments.

Each sulfur isotope would give a peak so there are three possible combinations of the hydrogen isotopes:

H-H (m/z = 2), H-D (m/z = 3) and D-D (m/z = 4).

Thus, you will find 4 × 3 = 12 components for the molecular ion.

However, some of these peaks will overlap each other so the stable isotopes of sulfur have masses 32, 33, 34, and 36.

Thus, the expected peaks will be:

32S:m/z=34,35,36

33S:m/z=35,36,37

34S:m/z=36,37,38

36S:m/z=38,39,40

If every peak were visible, you would see seven peaks in total.

They would have m/z = 34, 35, 36, 37, 38, 39, 40.

Isotope peaks are ionic parts of the same chemical equation that are more often than not visible to different adjoining crests inferable to particles of distinctive isotopic compositions.

The number of isotope crests and the relative concentration of each crest depends on the chemical equation of the ionic part and the normal isotopic composition of its constituent components.

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The period, group, and valence electrons block of the given element with the electronic configuration [Ne] 3s² 3p5 is Period 3, Group 7, p-block.

The periods in the periodic table are the horizontal rows found in the periodic table.

There are 7 periods in the Periodic Table.

Elements in the same period have the same number of electron shells.

The groups in the periodic table are the vertical columns found in the periodic table.

There are 18 periods in the Periodic Table.

Elements in the same group have the same number of valence electrons.

The electronic configuration of atoms can be used to identify the group and period each element belongs to.

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In carrying out the first standardization in this experiment, a student used 0.5793 g of potassium hydrogen phthalate (khp) and 24.55 ml of a NaOH solution are needed to reach the equivalence point then the concentration of student NaOH solution is 0.02455 L

Standardization is the process in which determining the exact concentration of molarity of the solution and here given data is

Mass of potassium hydrogen phthalate (C₈H₅KO₄) = 0.5793 g

Molar mass of potassium hydrogen phthalate (C₈H₅KO₄) = 204.22g/mol

The number of mole of potassium hydrogen phthalate present then,

Number of moles = mass/molar mass

Number of moles = 0.5793 g/204.22g/mol = 0.002836 mole

Volume of NaOH present = 24.55 ml

1 ml =  0.001 L then, 24.55 ml = 24.55 ml×0.001 L = 0.02455 L

The concentration (in mol/l) of the student's naoh solution is 0.02455 L

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The composition of the mixture is 2.5 moles of HI, 0.75-mole I₂, and 0.75 moles of H₂.

The act of combining elements or elements to shape an entire. the ensuing nation or product. manner of being composed; structure: This portrait has an orderly composition. make-up; constitution: His ethical composition becomes impeccable.

A composition can discuss with any innovative painting, be it a quick story, poem, essay, studies paper or a piece of tune. consequently, the principle difference between essay and composition is that essay is a form of composition whereas composition refers to any innovative paintings.

                       H₂ + I₂ = 2HI

initial             2mol  2     0mol

final                                   2.5 mol

limiting reagent is  I₂

2 mole of HI is produced by 1 mole of  I₂

2.5 mole of  I₂ is produced by = 1/2 × 2.5

                                                  = 1.25 mole

The final composition of the mixture = 2.5 moles of HI, 0.75-mole I₂, and 0.75 moles of H₂.

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