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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 only when energy is withdrawn when energy is supplied or withdrawn only when energ

y is supplied when energy is neither supplied nor withdrawn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when energy is supplied or withdrawn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 a phase transition occurs when energy is supplied or withdrawn from the system in which the material is located.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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3 years ago
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You have to make 500 mL of a 1.50 M BaCl2. You have 2.0 M barium chloride solution available. Determine how to make the needed d
Inga [223]

Answer:

You need 375 mL of BaCl2 solution.

Explanation:

M1V1=M2V2

Dilution formula. Substitute known values and solve for V1.

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3 years ago
Why is it better to measure the percent change in mass<br> ratherthan just using the change in mass?
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The mixture which contains elements only is (a) air (b) brass (c) mineral water (d) seawater
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Explanation:

hope this helps you :)

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