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Shalnov [3]
4 years ago
8

You leave a piece of bread outside for a few days. It forms green and blue mold. It smells awful. A chemical change has occurred

– True or False?
Explain with facts
Chemistry
2 answers:
Juli2301 [7.4K]4 years ago
8 0

Answer:

False

Explanation:

It is a physical change because the molecules of the bread didn't change, only the form did.

Fed [463]4 years ago
3 0

False. It is a physical change because the molecules of the bread didn't change only the form of the bread changed.

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34. 3.15 mol of an unknown solid is placed into enough water to make 150.0 mL of solution. The solution's temperature increases
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Answer:

ΔH = 2.68kJ/mol

Explanation:

The ΔH of dissolution of a reaction is defined as the heat produced per mole of reaction. We have 3.15 moles of the solid, to find the heat produced we need to use the equation:

q = m*S*ΔT

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<em>S is specific heat of the solution = 4.184J/g°C</em>

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The mass of the solution is obtained from the volume and the density as follows:

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