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balandron [24]
3 years ago
10

A glass breaks is a physical or chemical change

Chemistry
2 answers:
maksim [4K]3 years ago
7 0

Breaking glass is an example of a physical change because if you break it, it is still glass.

Licemer1 [7]3 years ago
3 0

physical.......................................................

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The freezing point of ethanol, CH3CH2OH, is -117.300 °C at 1 atmosphere. Kf(ethanol) = 1.99 °C/m
MAXImum [283]

Answer : The molecular weight of this compound is 891.10 g/mol

Explanation :  Given,

Mass of compound = 12.70 g

Mass of ethanol = 216.5 g

Formula used :  

\Delta T_f=i\times K_f\times m\\\\T_f^o-T_f=i\times T_f\times\frac{\text{Mass of compound}\times 1000}{\text{Molar mass of compound}\times \text{Mass of ethanol}}

where,

\Delta T_f = change in freezing point

T_f^o = temperature of pure ethanol = -117.300^oC

T_f = temperature of solution = -117.431^oC

K_f = freezing point constant of ethanol = 1.99^oC/m

i = van't hoff factor = 1   (for non-electrolyte)

m = molality

Now put all the given values in this formula, we get

(-117.300)-(-117.431)=1\times 1.99^oC/m\times \frac{12.70g\times 1000}{\text{Molar mass of compound}\times 216.5g}

\text{Molar mass of compound}=891.10g/mol

Therefore, the molecular weight of this compound is 891.10 g/mol

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Which of the following correctly describes the role of scientific models in the advancement of technology? Models represent the
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Models help us better understand the phenomena
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If the temperature of water increases as you heat it, the temperature is the independent variable.
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Which of the following elements is the largest?
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i did the same question on my test

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