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Alona [7]
2 years ago
12

Igneous rocks are formed from

Chemistry
1 answer:
ArbitrLikvidat [17]2 years ago
4 0

Answer:

heat and pressure

Explanation:

because it happens under heat and pressure.

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5. How many moles are in 58.6 L of Nitrogen gas (N.) at STP?
pantera1 [17]

Answer:

2.6166 moles

Explanation:

stp means: T=273k   p=101.3kpa

R= 8.31(constant)       v=58.6  

using the ideal gas law; pv=nRt

                                        101.3 x 58.6 = n x 8.31 x 273

                                         n= (101.3 x 58.6)\(8.31 x 273)

                                         n= 2.6166moles

6 0
3 years ago
Elements are arranged by their properties on the periodic table. Arranged by their properties?
vichka [17]
Properties like atomic number, valency etc...
3 0
2 years ago
Why is a solution that is 0.10M HCN and 0.10M LiCN considered a good buffer system?
const2013 [10]
Because of the common ion effect. Adding a common ion decreases the solubility of the salt which is the intention of a buffer.
8 0
3 years ago
Which statement best explains the process occurring in step 4 of the life<br>cycle?​
Marat540 [252]

Answer:

Which statement best compares a eukaryote and a prokaryote?  

A. Eukaryotes have a cell wall, while prokaryotes have a cell membrane.

*B. Eukaryotes have membrane-bound organelles, while prokaryotes have few specialized  

structures.

C. Eukaryotes use active transport to move substances across the cell membrane, while  

prokaryotes use facilitated diffusion.

D. Eukaryotes use flagella to move themselves through substances, while prokaryotes are not  

able to move.

Explanation: its B

5 0
3 years ago
Briefly describe bohr's model postulates and its limitations.​
ch4aika [34]

<u>Answer:</u>

<u>Bohr's Model postulates-</u>

I postulate - The electrons in an atom orbit around the nucleus in definite circular paths called orbits or shells.

II Postulate - Each shell or orbit represents a specific amount of energy.

III Postulate - By emitting or absorbing energy, an electron may shift from one stationary energy orbit to another.

<u>Three main Limitations -</u>

1- It adjusts to the hydrogen atom's spectrum but not to the spectra of other atoms.

2 - In the definition of the electron as a tiny particle that spins around the atomic nucleus, the wave properties of the electron are not described.

3- Bohr is unable to understand why classical electromagnetism is inapplicable to his model. That is why, when electrons are in a stationary orbit, they do not emit electromagnetic radiation.

Explanation:

<u>About Bohr's postulates-</u>

1 - The electron spins in circling circles around the nucleus, emitting no energy. The orbital angular momentum is constant in these orbits.

Only certain radii of orbits, corresponding to certain given energy levels, are required for electrons in an atom.

2- Not every orbit is possible. However, whenever an electron is in a legal orbit, it is in a state of unique and constant energy and does not emit energy (stationary energy orbit).

<u>For example -</u> The energies allowed for electrons in the hydrogen atom are given by the following equation: The Rydberg constant for the hydrogen atom is -2.8\times10^-^1^8 in this equation, and n = quantum number will range from 1 to ∞. For each of the values of n, the electron energies of a hydrogen atom produced by the above equation are negative. As n rises, the energy becomes less negative and thus rises.

3- By emitting or absorbing energy, an electron may shift from one stationary energy orbit to another.

The energy difference between the two states would be equal to the energy released or consumed. This energy E is in the form of a photon, and it can be measured using the following formula:

    E=hv

E is the energy (absorbed or emitted) in this equation, and h is the Planck constant (its value is 6.63\times10^-^3^4 Js) and v denotes the frequency of light, which is calculated in 1/ s.

8 0
2 years ago
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