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3 years ago

20. What is an irreversible change?

2 answers:

8 0

A change is called irreversible if it cannot be changed back again. In an irreversible change, new materials are always formed.

Contact [7]3 years ago

6 0

Answer:

A change is called irreversible if it cannot be changed back again. For example you cannot change a cake back into its ingredients again. Irreversible changes are permanent.

Explanation:

Hope this helps!! :))

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Two posssible lewis structures for the molecule ch2s are given. determine the formal charge on each atom in both structures

jok3333 [9.3K]

The formal charge on each atom can be known by counting up the number of valence electrons that is present on each atom.

<h3>What is Lewis structure?</h3>

The term Lewis structure is the representation of a compound using its symbols and showing the valence electrons as dots. This question is incomplete as the Lewis structures were not shown.

If it is shown, we can know the formal charge on each atom by counting up the number of valence electrons that is present on each atom.

Learn more about Lewis structure: brainly.com/question/4144781

8 0

2 years ago

Which element is classified as a noble gas? O N Cl Xe

ivann1987 [24]

Answer: The correct answer is Xenon (Xe).

Explanation:

Noble gases are defined as the gases which have fully filled electronic configuration or stable electronic configuration.

From the given options:

Option 1: Oxygen (O)

The atomic number of this element is 8.

Electronic configuration of this element: $1s^22^22p^4$

As, this is not the stable electronic configuration. Thus, it is not considered as a noble gas.

Option 2: Nitrogen (N)

The atomic number of this element is 7.

Electronic configuration of this element: $1s^22^22p^3$

As, this is not the stable electronic configuration. Thus, it is not considered as a noble gas.

Option 3: Chlorine (Cl)

The atomic number of this element is 17.

Electronic configuration of this element: $1s^22^22p^63s^23p^5$

As, this is not the stable electronic configuration. Thus, it is not considered as a noble gas.

Option 4: Xenon (Xe)

The atomic number of this element is 54.

Electronic configuration of this element: $[Kr]5s^24d^{10}5p^6$

As, this is a stable electronic configuration. Thus, it is considered as a noble gas.

Hence, the correct answer is Xenon (Xe).

7 0

4 years ago

Read 2 more answers

Need help asap!!!!!!!!

fgiga [73]

Answer:

A Valence electron are the electrons in the outermost shell or energy level of an atom.

4 0

3 years ago

A 62.6-gram piece of heated limestone is placed into 75.0 grams of water at 23.1°C. The limestone and the water come to a final

VMariaS [17]

M₁ = mass of water = 75 g
T₁ = initial temperature of water = 23.1 °C
c₁ = specific heat of water = 4.186 J/g°C

m₂ = mass of limestone = 62.6 g
T₂ = initial temperature of limestone = ?
c₂ = specific heat of limestone = 0.921 J/g°C

T = equilibrium temperature = 51.9 °C
using conservation of heat
Heat lost by limestone = heat gained by water
m₂c₂(T₂ - T) = m₁c₁(T - T₁)
inserting the values
(62.6) (0.921) (T₂ - 51.9) = (75) (4.186) (51.9 - 23.1)
T₂ = 208.73 °C
in three significant figures
T₂ = 209 °C

7 0

4 years ago

What are two challenges posed by the near-vacuum of space?

cestrela7 [59]

It is a devoid of matter and gaseous pressure and atmospheric pressure.

3 0

3 years ago

20. What is an irreversible change?​

20. What is an irreversible change?