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Tanzania [10]
3 years ago
15

When do phase transitions occur in molecules? only when energy is withdrawn when energy is supplied or withdrawn only when energ

y is supplied when energy is neither supplied nor withdrawn
Chemistry
2 answers:
Elden [556K]3 years ago
8 0

when energy is supplied or withdrawn

V125BC [204]3 years ago
4 0

A phase transition or phase change refers to <u>transitions between solid, liquid and gaseous states of matter.</u> A phase of a thermodynamic system and the states of matter have uniform physical properties.

<u>During a phase transition certain properties of the medium change</u>, often discontinuously, as a result of the <em>change of some external condition</em>, such as temperature, pressure or others.  In this way,<u> a phase transition occurs when energy is supplied or withdrawn from the system in which the material is located. </u>

For example, when we want the water to <u>boil</u> (going from liquid to gaseous state) we <em>supply energy</em> in the form of heat to change its state. On the other hand, when we want to produce <u>ice</u>, we put liquid water in a container that we then put in the freezer that is at a very low temperature, around 0 ºC. By placing the water at a lower temperature the kinetic energy of the water molecules decreases (<em>it is removed from the system</em>) and these molecules are ordered to form a solid (the ice).

Thus, a phase transition occurs when energy is supplied or removed from the molecules.

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In the reaction of an acid with water, a hydronium ion forms
Nutka1998 [239]
Really, ionization takes place. It means the acid dissociates in water. Ionization is just a fancy way of saying dissociation. Always think easy. 

Definition of IONIZATION: The process describing the dissociation of an acid in water.

If it ionizes or dissociates completely in water, then it shows that hydronium is a STRONG ACID. And if it ionizes partially, that shows hydronium is a WEAK ACID.

So, the answer will be choice B. by a process called ionization
4 0
4 years ago
Why beta carbon hydrogen is easily replaced​
Marysya12 [62]

Answer:

γ−Hydrogen is easily replacable during bromination reaction in presence of light , because Allylic substitution is being preferred.

Explanation:

that's all

8 0
3 years ago
Read 2 more answers
What happened to the mixture as it is poured into the strainer with cloth?​
zzz [600]

Answer:

The solid particles will be trapped behind on the strainer while the liquid molecules will pass or filter through.

Explanation:

Filtration is a process of separation of mixtures involving an insoluble solid and a fluid such as liquids or gases using a filtering medium such as paper or cloth or any other material. During the process, the liquid molecules pass through the filtering medium whereas the solid particles are not allowed to pass through but are retained by the medium. The reason is that the pores on the filtering medium are only small enough for the liquid molecules to pass through but not the solid particles.

An example of a mixture that can be separated through filtration is a suspension of chalk and water. Also, a mixture of water and solid particles such as water and tea leaves can also be separated using a strainer with cloth.

In the question, if a mixture of insoluble solids in a liquid is passed through a strainer with cloth, the solid particles will be trapped behind on the strainer while the liquid molecules will pass through.

3 0
3 years ago
EASY 100 POINTS, WILL MARK BRAINLEST, 2 QUESTIONS, SHOW YOUR WORK OR NO POINTS
SVETLANKA909090 [29]

Answer:

Explanation:

1. Please provide the enthalpy info - I will work on it with the info

2.

i) Reaction a should be modified to match the number of S in equation:

 2S + 2O2 -> 2SO2     deltaH = -370kJ

ii) Reaction b should be written reversely to match the reactants of SO2:

 2SO2 + O2 -> 2SO3     deltaH = 256kJ

iii) Adding the equations together:

 2S + 3O2 -> 2SO3

iv) Enthalpy of the combined reaction = -370+256 = -114kJ

 It is negative so the reaction is exothermic.

5 0
3 years ago
Read 2 more answers
Consider an ionic compound, MX2, composed of generic metal M and generic, gaseous halogen X.
siniylev [52]

Lattice energy U(MX2) to calculate

Use Born-Haber(-Fajans) Cycle

http://en.wikipedia.org/wiki/Born%E2%80%...

M(s) + X2 → MX2(s) ΔHf°MX2 = -957 kJ mol^-1

M(s) →ΔHsub(M)→ M(g) ΔHsub = 123kJ mol^-1

M(g) →ΔHIE1(M)→ M^+ + e⁻ 757 kJ mol^-1

M^+→ΔHIE2(M)→ M^2+ + e⁻ 1451 kJ mol^-1

X2 →ΔHBE(X2)→ 2X +153 kJ mol^-1

X + e⁻→ΔHEA(X)→ X^- -313 kJ mol^-1

ΔHfo = U + ΔHsub(M) + IE1 + IE2 + ΔHdissX2 + 2EA1(X)

-957= U + 123 + 757 + 1451 + 153 – 626 = U + 1858

U = -2815 kJ mol^-1 The –ve sign is often dropped

5 0
4 years ago
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