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3 years ago

Is Squeezing oranges to make orange juice a chemical or physical change?

Chemistry

2 answers:

a_sh-v [17]3 years ago

7 0

Squeezing just the juices out of the orange, like with your hand or whatever you use, is a physical change. yes :)

dimulka [17.4K]3 years ago

5 0

This would be a physical change because despite the fact the juice has been squeezed out of it, the orange is still an orange. A physical change is when something changes matter, like a solid to a liquid or a liquid to a gas. Since it's been changed from a solid orange to liquid juice, it's a physical change.

Hope I helped! :)

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4 years ago

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Serggg [28]

Answer:

c. The reaction is spontaneous at all temperatures.

Explanation:

The spontaneity of a reaction can be determined by the thermodynamic property named Gibb's free energy or simply free energy (G).

The change in the free energy of a system is defined as the difference between the increase in enthalpy (ΔH) and the product of the temperature (T) times the increase in entropy (ΔS):

ΔG = ΔH - T ΔS

The sign of ΔG tells if a reaction is spontaneous according to this:

ΔG < 0, the reaction is spontaneous.

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ΔG > 0, the reaction is not spontaneous.

The question states that a reaction is exothermic, and its entropy change is positive. That means:

Exhotermic: ΔH < 0
Positive entropy change: ΔS > 0

Remember that the temperature is stated in absolute scale, so T is always positive.

Hence, ΔG = ΔH - T ΔS = (negative) - T (positive) = (negative) + (negative) = negative.

Conclusion: since ΔG is negative, regardless the temperature, you conclude that the reaction is spontaneous at all temperatures, which is the option c.

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3 years ago

Read 2 more answers

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Answer:

see explanation and punch in the numbers yourself ( will be better for your test)

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