describe two layers of skins​

Answer:

34.33 %.

34.33 %.

34.33 %.

Explanation:

W% = [(W of solute NaF)/(W of solution)] x 100.

W of solute NaF = 65.4 g.

W of solution = W of solute NaF + W of water = 65.4 g + 125.1 g = 190.5 g.

∴ W% = [(W of solute NaF)/(W of solution)] x 100 = [(65.4 g)/(190.5 g)] x 100 = 34.33 %.

scientific theory

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Answer:

B. scientific theory

Explanation:

The scientific theory explains the phenomenon observed in the natural world. It is based upon the scientific method. To arrive at the scientific theory a hypothesis is formed, experiments are designed and conducted, resulted evaluated, analyzed and conclusions are reached. scientific theory are based upon experiments that are tested under controlled conditions.

Answer:

17.65 %.

Explanation:

% H = [Atomic mass of (3H)/molar mass of NH₃] x 100 = [(3 x 1.0)/(17)] x 100 = 17.65 %.

Answer:

3.375 M.

Explanation:

∵ (MV) before dilution = (MV) after dilution.

∴ M before dilution = (MV) after dilution / V before dilution = (0.675 M)(500.0 mL)/(100.0 mL) = 3.375 M.

Answer:

A) electrons

Explanation:

protons are positive , neutrons are neutral , and electrons are negative , and non-polar does not have a charge . so electrons is correct

The particle that has negative charge is electron

Hence Electrons is the correct option (A)

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Answers are B, D and E. A and C are cooperation for shelter.

Explanation:

Competition means when more than one person or individual is competing for a certain thing.

For example, two prairie dogs fight over underground space.

This means that both the dogs are fighting to have a house for themselves.

Thus, we can conclude that statements which describe competition for shelter are as follows.

Answer:

it is the point where the material turns to gas

Explanation:

Answer: The melting point or boiling point of a substance at a specific pressure

Explanation: That was the correct answer apex.

B) B

The activation energy for the forward reaction is represented by the arrow from the reactants to the transition state in a reaction diagram.

In a reaction diagram, the activation energy for the forward reaction is represented by the arrow from the reactants to the transition state. This arrow shows the energy barrier that must be overcome for the reaction to occur. The activation energy is the minimum amount of energy that reactant particles must have in order to successfully collide and form products.

Meteors are a streak of light. A meteorite is when it hits Earth's surface. So, it would be D.

Final answer:

Meteorites have struck the Earth's surface, but meteors have not. Meteorites are meteoroids that land on Earth, whereas meteors are glowing gases in the atmosphere that do not reach the surface.

Explanation:

Meteorites are meteoroids that survive the journey through the atmosphere and hit the Earth's surface. On the other hand, meteors are the glowing trail of gases formed as meteoroids heat up in the atmosphere but do not reach the Earth's surface.

Meteorites can be found on Earth, providing valuable information about our solar system, while most meteors burn up before reaching the surface. The distinction between meteorites and meteors lies in their fate upon entering the Earth's atmosphere.

As the temperature is increased all the molecules including the gas molecules get more kinetic energy, they move faster, and more of them can escape from the solution when they hit the surface meaning fewer molecules stay inside, hence lower solubility.

Final answer:

The solubility of gases in liquids decreases with rising temperature because added thermal energy increases kinetic energy, enabling the gas molecules to overcome the attraction of the solvent molecules and escape back into the gas phase.

Explanation:

The solubility of gases in liquids is affected by temperature. As temperature increases, the kinetic energy of molecules in both the solvent and the solute also increases. Specifically for gases like HCl, NH₃, and SO₂, which are soluble under standard conditions, an increase in temperature causes these gas molecules to have a greater tendency to escape from the attraction of the solvent molecules and revert to the gas phase due to the rise in kinetic energy. Therefore, this leads to a decrease in their solubility within the solvent.

For example, when we heat a solvent that has a gas dissolved in it, we provide thermal energy that overcomes the attractive forces between the gas and solvent molecules. This process is similar to how increased temperature results in higher vapor pressure in pure liquids because thermal energy overcomes the attractive forces between the molecules, allowing them to enter the gas phase.

In summary, the dissolution of most gases is an exothermic process, meaning it releases heat, but when heat is added to the system, it facilitates the separation of the gas from the solution, thus decreasing gas solubility with the rise in temperature

117 because the number of protons and neutrons are the same as the atomic mass.

Final answer:

A neutral atom with an atomic number of 117 would have 117 electrons. The valence shell of element 117 (Tennessine) is likely to have 7 electrons, similar to other halogens, though high atomic number elements can be unpredictable due to their instability.

Explanation:

If an element has an atomic number of 117, it means that a neutral atom of this element would have 117 protons in its nucleus. According to the basic rules of atomic structure, a neutral atom has the same number of protons and electrons. Therefore, an atom of this element would have 117 electrons.

Regarding the valence shell electron configuration, since element 117 (Tennessine, Ts) is in the 17th group of the periodic table and is part of the halogens, its valence shell could be similar to that of other halogens. Considering the periodic trends and the fact that it belongs to the 7th period of the table, its valence shell would likely have 7 electrons. However, due to its high atomic number and unstable nature, the element's chemistry might not entirely follow the trends observed in lighter elements.

0.234 mol C[tex]C_{6}  H_{5}  OH[/tex]

The number of molecules would be - 1.410*[tex]10^{23}[/tex] molecules in 22 grams of phenols.

The molecular formula of Phenol is C6H5OH

, Therefore, molecular weight:

= 6(Mass of carbon) + 6(Mass of hydrogen) + 1 (Mass of oxygen)

= 6 × 12.0107 + 6 × 1.00784 + 15.999 × 1

= 94.11

=> The number of moles of phenols:

=> No of mol of phenol = weight/Mwt

[tex]\frac{weight}{molecular\ weight}\\\\= \frac{22}{94.11}\\[/tex]

= 0.234 moles

=> The number of molecules of phenol would be in 22 grams:

molecules = [tex]6.022 \times 10^{23} *\ (number\ of\ moles)[/tex]

[tex]6.022 \times 10^{23} \times (0.234)\\= 1.410 \times 10^{23}[/tex]

Thus, the number of molecules would be - 1.410 [tex]\times 10^{23}[/tex] molecules.

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Concentration Definition. In chemistry, concentration refers to the amount of a substance per defined space. Another definition is that concentration is the ratio of solute in a solution to either solvent or total solution. Concentration usually is expressed in terms of mass per unit volume.

Concentration = no of moles of solute/solvent

RCOOR. the answer is first option

Answer:

Thermal energy is the Total translation kinetic energy of the particles in an object and internal energy is the Total energy of particles in an object

Explanation:

Answer:

Thermal is total translation kinetic energy of the particles in an object and Internal energy is the total energy of particles in an object

Explanation:

= 63.04 %  

The balanced equation for the reaction;

5 C + 2 SO2 → CS2 + 4 CO  

We can calculate the theoretical yield;

   = (32.0 g SO2) / (64 g C/mol) x (1/2) x (76.1418 g CS2/mol)

   = 19.035 g CS2 in theory  

But;

Percentage yield = Actual yield/theoretical yield × 100%

                              = (12.0 g) / ( 19.035 g) × 100%

                              = 0.6304 × 100%

                               = 63.04%  

Final answer:

To calculate the percentage yield of carbon disulfide, we can compare the actual yield to the theoretical yield. Using stoichiometry, we can calculate the theoretical yield based on the given masses of sulfur dioxide and carbon disulfide. The percentage yield is found to be 31.5%.

Explanation:

To calculate the percentage yield of carbon disulfide in this reaction, we need to compare the actual yield (12.0g) to the theoretical yield. The theoretical yield can be calculated using stoichiometry by converting the mass of sulfur dioxide (32.0g) to moles, and then using the mole ratio between sulfur dioxide and carbon disulfide in the balanced equation.

First, let's find the moles of sulfur dioxide:

32.0g SO2 * (1 mol SO2 / 64.06g SO2) = 0.500 mol SO2

According to the balanced equation, 1 mol of SO2 produces 1 mol of carbon disulfide. So, the theoretical yield of carbon disulfide is also 0.500 mol.

Now, we can convert the theoretical yield from moles to grams:

0.500 mol CS2 * (76.14g CS2 / 1 mol CS2) = 38.07g CS2

Finally, we can calculate the percentage yield:

Percentage yield = (Actual yield / Theoretical yield) * 100

Percentage yield = (12.0g / 38.07g) * 100 = 31.5%

The answer is C) Communities in an effort to beautify local neighborhoods

Answer: nature that benefit mankind

Explanation:

Ecosystem services are the benefits that mankind freely gain from nature and well-functioning ecosystems. For example, agroecosystems, forest ecosystems, grassland ecosystems and aquatic ecosystems. When these ecosystems function well, they provide benefits such as agricultural produce, timber, and aquatic organisms such as fishes and crabs. These benefits together are called 'ecosystem services'.

They all have the same number of electrons in the electron cloud.

The have same number of valence electrons

The elements in the same group has similar number of valence electrons. For instance All the alkali metals in Group 1 have 1 valence electron, so they all tend to react the same way with other substances. The elements in each group have the same number of electrons in the outer orbital which are responsible for the chemical properties of element so we can say that each family has the same chemical properties.

Answer: 2)Vitamin A is added to rice to combat blindness.

Explanation:

The genetic engineering is a process of manipulation of the genome of the organism by either introducing new genes in an organism's genome or by removing the defective genes. This is basically performed to introduce new traits in an organism or to remove the disease causing genes.

Vitamin A is added to rice to combat blindness is the correct option because genetic engineering will ensure the introduction of the genes which are responsible for secretion of vitamin A in the rice plant as the rice species does not naturally produce vitamin A. This will help in combating the disorder of blindness in humans.  

Genetic engineering involves introducing genetic material into organisms to create traits for specific purposes.

Genetic engineering involves the artificial incorporation of genetic material from one form of life into another, creating genetically modified organisms (GMOs) like 'golden rice' or 'Bt' corn. These modifications aim to introduce desirable traits into plants for various purposes.

The mass per volume of a substance is called its density.

The mass per unit volume is substance called density.

Hope this helps

Have a great night

God bless you

- Kayla :)

Answer:

The correct answer is: D. Air masses are created by patterns of heating and cooling of the Earth's surface.

Explanation:

The air masses can be simply be divided into warm and cold ones, further they can be moist or not. The formation of the air masses, be it warm and cold, over the land masses is because of patterns of heating and cooling. This results some areas to produce very large air masses that are cold and dry, like Siberia, or warm and dry large air masses, like Sahara. Also, on a local level there's air masses that develop every day and night, which is noticeable during the night and the morning, where the colder air masses from the mountains move down to the valleys, and the warm air masses from the valleys move up to the mountains. That is a because of the change in the heating and cooling patters that differ during the day and the night.

Answer:

The correct answer is: D. Air masses are created by patterns of heating and cooling of the Earth's surface.

Explanation:

A.

convection and conduction, but not radiation

The answer is A, thank you boredpanda for checking my answer probably accendintly.

Hope this helps!

A chemical indicator in a titration experiment must change the color of the solution near the equivalence point.

Wavelength and frequency are inversely proportional to each other. ... Even though the wave speed is calculated by multiplying wavelength by frequency, an alteration in wavelength does not affect wave speed. Rather, an alteration in wavelength affects the frequency in an inverse manner.

❤️Hello!❤️ This is simple question and easy to understand.

so first you use a formula to calculate frequency of the wave.

v _ stands for velocity a.k.a speed

f_ stands for frequency which you have to find.

(pronounced lemda)_ stands for wavelength.

Then you gonna place all your values according to you have in the formula as shown then solve for f.

Finally, you use the time formula

where

T_ is period a.k.a time which equal to the reciprocal of frequency or equal to 1/f.

Simply input your values according to the formula and you your answer as 0.5s Hope this helps!  ↪️ Autumn ↩️

Hello

V= m/p when V= volume, m, mass and p the density

then

V=18754000/0,7888

Remember that you first have to convert kg to gr, simply multiplied by 1000.

then

V= 23799492 cm3

Best regards

Na

hope this helps :)

Answer:

150.0 mL.

Explanation:

∵ (MV) before dilution = (MV) after dilution.

∴ V before dilution = (MV) after dilution / M before dilution = (0.15 M)(500.0 mL)/(0.50 M) = 150.0 mL.

Surface fire

Answer:

Option C:- concentration of products

Explanation:

According to Le Chateleir's principle,

if the forward reaction is favored in the equilibrium then concentration of products will increase and concentration of reactants will decrease.

If the reverse reaction is favored in the equilibrium then concentration of products will decrease and concentration of reactants will increase.

When the forward reaction is favored in a chemical equilibrium, the concentration of products will increase as the equilibrium shifts to the right, in accordance with Le Chatelier's principle.

When a chemical reaction reaches equilibrium and the forward reaction is favored, we observe that the equilibrium shifts to the right or toward the product side. This means that there will be an increase in the concentration of products. In a dynamic equilibrium, when we increase the concentration of the reactants, the system will respond by shifting the equilibrium to the right to use up the excess reactants and produce more products.

This behavior adheres to Le Chatelier's principle, which informs us that the system will adjust to minimize the change, leading to an increase in product concentration until equilibrium is reestablished.

For example, if the concentration of a reactant such as SCN- (aq) is increased, the rate of the forward reaction will increase, leading to a decrease in the concentration of this reactant as it is converted into the product FeSCN²+ (aq), consequently, the concentration of FeSCN²+ will increase as the equilibrium shifts to the right.

The process to create a protected area takes a long time because there's numerous things that have to be taken in account and sorted out before the area gets that kind of legal status.

Usually there's people living in the area that is supposed to be protected, though it is mostly small settlements. The people living there are connected with that area, use the resources, and their lives are largely based and dependent on it. In order for any problems to be avoided, these people should all be educated, deals to be made with them, and properly negotiated so that the area wouldn't have any damage, but also them to be able to sustain themselves.

The boundaries of the area are also complicated, it it takes time to sort out what parts should be included and what not. Basically to set the priorities.

People should be employed to protect and take care of the area, so they have to undergo a training, education, and to get familiar with it.

The legalization of the area as such can sometimes too make problems and take some time.