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Alexxx [7]
3 years ago
13

Which of these is an example of a physical change

Chemistry
1 answer:
Iteru [2.4K]3 years ago
3 0

A. Breaking Bread, because you can rip or cut it and it is still bread.

hope that helps :)

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Calculate the molar concentration of the Br⁻ ions in 0.065 M MgBr2(aq).
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MgBr2(aq) is an ionic compound which will have the releasing of 2 Br⁻ ions ions in water for every molecule of MgBr2 that dissolves.
MgBr2(s) --> Mg+(aq) + 2 Br⁻(aq)
            [Br⁻] = 0.065 mol MgBr2/1L × 2 mol Br⁻ / 1 mol MgBr2 = 0.13 M
The answer to this question is [Br⁻] = 0.13 M
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As the N₂ supply is unlimited, what we need to do to solve this problem is <u>convert molecules of H₂ into molecules of NH₃</u>. To do so we use the <em>stoichiometric coefficients</em> of the balanced reaction:

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10 NH₃ molecules could be prepared from 15 molecules of H₂ and unlimited N₂.  

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