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Yanka [14]
3 years ago
8

what is the correct definition of refraction? 1. A change in the direction of light when it goes from one medium into a differen

t medium. 2. light passes though an object without being affected by that object. 3. when light strikes an object, it doesn’t pass through and it does not change direction. 4. light bounces back from an object at the same angle and intensity that the object received it.
Chemistry
2 answers:
elena-14-01-66 [18.8K]3 years ago
7 0

Answer: The answer is A

Explanation:

serious [3.7K]3 years ago
5 0

im pretty sute the answer would be number 4.

mark brainliest  :)

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3 years ago
Describe the observation Robert Brown made.​
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Calculate the standard enthalpy change for the reaction at 25 ∘ C. Standard enthalpy of formation values can be found in this li
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Answer:

The standard enthalpy change for the reaction at 25^{0}\textrm{C} is -2043.999kJ

Explanation:

Standard enthalpy change (\Delta H_{rxn}^{0}) for the given reaction is expressed as:

\Delta H_{rxn}^{0}=[3mol\times \Delta H_{f}^{0}(CO_{2})_{g}]+[4mol\times \Delta H_{f}^{0}(H_{2}O)_{g}]-[1mol\times \Delta H_{f}^{0}(C_{3}H_{8})_{g}]-[5mol\times \Delta H_{f}^{0}(O_{2})_{g}]

Where \Delta H_{f}^{0} refers standard enthalpy of formation

Plug in all the given values from literature in the above equation:

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