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 only when energy is withdrawn when energy is supplied or withdrawn only when energ

y is supplied when energy is neither supplied nor withdrawn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when energy is supplied or withdrawn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 a phase transition occurs when energy is supplied or withdrawn from the system in which the material is located.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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A sample of argon gas has a volume of 795 mL at a pres-sure of 1.20 atm and a temperature of 116 ∘C. What is the final volume of
jek_recluse [69]

<u>Answer:</u> The volume when the pressure and temperature has changed is 1.6\times 10^2mL

<u>Explanation:</u>

To calculate the volume when temperature and pressure has changed, we use the equation given by combined gas law.

The equation follows:

\frac{P_1V_1}{T_1}=\frac{P_2V_2}{T_2}

where,

P_1,V_1\text{ and }T_1 are the initial pressure, volume and temperature of the gas

P_2,V_2\text{ and }T_2 are the final pressure, volume and temperature of the gas

Let us assume:

P_1=1.20atm\\V_1=795mL\\T_1=116^oC=[116+273]K=389K\\P_2=0.55atm\\V_2=?mL\\T_2=75^oC=[75+273]K=348K

Putting values in above equation, we get:

\frac{1.20atm\times 795mL}{389K}=\frac{0.55atm\times V_2}{348K}\\\\V_2=\frac{1.20\times 795\times 348}{0.55\times 389}=1.6\times 10^3mL

Hence, the volume when the pressure and temperature has changed is 1.6\times 10^2mL

5 0
3 years ago
Jamie rolls a 6-sided die 30 times and determines that the experimental probability of rolling a 2 is Start Fraction 1 over 15 E
anyanavicka [17]

Answer:

Conduct more trials

Explanation:

Theoretical Probability can be defined as what someone is expecting to happen

Experimental Probability on the other hand, is defined as what actually happens.

Probability is usually calculated in the same way for experimental probability and that of theoretical probability. You divide the total number of possible ways in which a particular outcome can happen, by the total number of outcomes itself.

In Experimental probability, the more times a probability is tried, it gets closer and even more closer to theoretical probability.

So, for the question, Jamie should improve the number of tries more, so as to get his experimental probability results to be closer to the theoretical probability result.

8 0
3 years ago
True or false: You must make observations and conduct research prior to creating a hypothesis.
bekas [8.4K]

Answer:

true

Explanation:

...................

8 0
3 years ago
Electronegativity can best be defined as
lukranit [14]
It's B the degree to which an atom wants to gain more electrons
8 0
3 years ago
1. Which is NOT one of the main factors that determine the state of matter? *
hichkok12 [17]

Answer: C

(no guarantees though)

6 0
3 years ago
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