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GREYUIT [131]
3 years ago
13

Suppose that a substance in a beaker is heated over a burner in a science lab. Which observation would most likely indicate that

a chemical change has occurred in the substance?
If the substance is a liquid or solid, an increase in temperature would indicate a chemical change.
If the substance is a liquid, a change of some of the liquid to gaseous form would indicate a chemical change.
If the substance is a solid, a change of some of the solid to liquid form would indicate a chemical change.
If the substance is a liquid or solid, production of an odor would indicate a chemical change.
Chemistry
2 answers:
saul85 [17]3 years ago
7 0

^^

Otherwise known as D.

(this is for people who are just looking for letters)

loris [4]3 years ago
5 0

Answer:

If the substance is a liquid or solid, production of an odor would indicate a chemical change.

Explanation:

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Answer:

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Explanation:

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\Delta n_g = (12 - 15)/2 = -3/2

We have;

\Delta H = \Delta U + \Delta n_g\cdot R\cdot T

Where R and T are constant, and ΔU is given we can write the relationship as follows;

H = U + \Delta n_g\cdot R\cdot T

Where;

H = The heat at constant pressure

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\Delta n_g = The change in the number of gas molecules per mole

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Therefore, we get;

H = -3,272 kJ + (-3/2) mol ×8.314 J/(mol·K) ×300 K) × 1 kJ/(1000 J) = -3,275.7413 kJ

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See explanation and image attached

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