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3 years ago

What is anus?plss help

Chemistry

2 answers:

Veronika [31]3 years ago

6 0

Please help me!!!!!!

marta [7]3 years ago

6 0

Answer:

The anus is the opening where the gastrointestinal tract ends and exits the body. The anus starts at the bottom of the rectum, the last portion of the colon (large intestine). The anorectal line separates the anus from the rectum.

Tough tissue called fascia surrounds the anus and attaches it to nearby structures.

Circular muscles called the external sphincter ani form the wall of the anus and hold it closed. Glands release fluid into the anus to keep its surface moist.

A plate-like band of muscles, called the levator ani muscles, surround the anus and form the floor of the pelvis. A network of veins lines the skin of the anus.

This is the explanation by web MD, it's well put

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Formation of ionic bond is affected by

Alina [70]

Answer:

Ionization energy, electronegativity, and lattice energy are the factors that influence the formation of ionic bonds of elements.

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3 years ago

1. Which of the following statements about mechanical waves is true?

Anna [14]

1. The answer is "a".

Mechanical waves require a medium to travel. If there is no medium, the mechanical wave doesn't travel. Since, they are waves; they have a wavelength, frequency, speed and also amplitude. The speed depends on the medium and type of the wave. An example for the mechanical waves is sound wave.

2. E = hf, where E is energy, h is plank constant and f is the frequency. Hence, if the frequency is high, then the energy is high.

v = fλ , where v is the speed, f is the frequency and λ is the wavelength. If the frequency is high, then the wavelength is low.

According to the given choices, gamma rays have the shortest wavelength and highest energy on electromagnetic spectrum.

3. The wavelength of X-rays are smaller the wavelength of infrared.

According to the v=fλ, lower the wavelength, then higher the frequency. According to the E = hf, if the frequency is high, then the energy is also high.

Hence, the correct answer is "d"

4. In a longitudinal wave (compression wave) the particles of a matter move parallel.

There are two types of waves according to the particle movement. They are transverse waves and longitudinal waves. In transverse waves, the particles of the medium move perpendicular to the direction of the wave and longitudinal waves have parallel movement of particles to the direction of wave.

5. In regard to spend of sound, sound travels slowest in gases.

Solids have the highest speed of sound while gases have the lowest. This is because of the particle arrangement of each phase. Solid phase has very tightly packed particle arrangement and due to that the transfer of sound wave in easy than in gases.

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4 years ago

When calcium and magnesium metal are first purchased they are extremely shiny with metallic luster. The metal samples you receiv

gogolik [260]

Answer: The calcium and magnesium metal samples had undergone a chemical reaction (oxidation) with the oxygen present in the air around the shelf to form oxides which caused them to lose their metallic luster overtime. This process is known as tarnishing.

Aluminium also undergoes this process but at a slower rate due to its lower reactivity compared with calcium or magnesium.

Explanation:

Calcium and magnesium belong to the group 2 of the periodic table of metals,generally called alkaline earth metals. They are very reactive and on exposure to air, they react with the oxygen present in air to form coatings/films of calcium oxide and magnesium oxide respectively over the metals. This causes the metals to lose their metallic shine or luster overtime.

Aluminium also undergoes this process generally known as tarnishing forming aluminium oxide but at a slower rate when compared to calcium or magnesium due to their being more reactive than aluminium is.

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4 years ago

In a calcium atom in the ground state, the electrons that possess the least amount of energy are located in the

hram777 [196]

Answer is: (1) first electron shell.

Aufbau principle is a scheme used to reproduce the electron configurations of the ground states of atoms by successively filling subshells (orbitals) with electrons in a specific order.

Filling subshells in the following order: 1s, 2s, 2p, 3s, 3p, 4s, 3d, 4p, 5s, 4d, 5p, 6s, 4f, 5d, 6p, 7s, 5f.

For example, atom of calcium.

Atomic number of calcium is 20, it means that it has 20 protons and 20 electrons, so atom of calcium is neutral.

Electron configuration of calcium atom: ₂₀Ca 1s² 2s² 2p⁶ 3s² 3p⁶ 4s².

8 0

4 years ago

The Cr 3+ ion forms octahedral complexes with three neutral ligands X, Y, and Z. The color of CrX 6 3+ is blue; the color of CrY

sergeinik [125]

Answer:The statement which is false is d

Explanation:

The color which we see from our eyes is basically the complementary color of wavelength of light which is absorbed.

The wavelegth of light follows the following sequence:

Violet<Indigo<Blue<Green<Yellow<Orange<Red.

So the shortest wavelegth is of violet light and longest wavelength of light is Red.

Since energy is E=hv=hc/λ ;So energy is inversely related with wavelegth and hence

For ligand X the complex has blue color and so we can ascertain that ligand X would have absorbed the Red light as the complementary color of blue light is Red.So the complex of ligand X absorbs the longest wavelegth and hence the energy gap between the two split d-orbitals t2g and eg would be very less. Larger the energy gap between t2g and eg orbitals more stronger is the ligand .

So X would be a weak field ligand.

For ligand Y the complex has yellow color and so we can ascertain that ligand Y would have absorbed the Violet light as the complementary color of yellow light is violet. Violet has the lowest wavelegth and hence the energy gap between the two split d-orbitals t2g and eg would be very large. Larger the energy gap between t2g and eg orbitals more stronger is the ligand .

So Y is a strong field ligand.

For ligand Z the complex has red color and so we can ascertain that ligand Z would have absorbed the blue light as the complementary color of red light is blue.The wavelegth of blue light lies between violet and red hence the energy gap between the two split d-orbitals t2g and eg would be in between than the other two liagnds.

So Z would be moderate field ligand.

options A , B and C are correct statements.

option D is incorrect because Z absorbs the moderate wavelegth.

The answer is d as it is only statement which is incorrect.

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3 years ago

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