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Olegator [25]
3 years ago
11

What column do these go into physical or chemical property ??

Chemistry
1 answer:
RSB [31]3 years ago
6 0

Answer:

Explanation:

Chemical properties:

These are the properties which involve the chemical reaction.

For example:

Combustion, flammability, toxicity, enthalpy of formation etc are chemical properties.

Reaction with oxygen ( chemical property)

Conduction of heat ( chemical property)

Not flammable (chemical property)

Physical properties:

The property which not involve any chemical reaction it only involve the physical appearance of substance.

For example:

Density, odor, color, texture etc.

Smooth texture (physical property)

Reddish color ( chemical property)

Sink in water ( chemical property)

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Answer:

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A 30.7 g sample of Strontium nitrate, Sr(NO3)2•nH2O, is heated to a constant mass of 22.9 g. Calculate the hydration number.
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Answer:

  • <em>Hydration number:</em> 4

Explanation:

<u>1) Mass of water in the hydrated compound</u>

Mass of water = Mass of the hydrated sample - mass of the dehydrated compound

Mass of water = 30.7 g - 22.9 g = 7.8 g

<u>2) Number of moles of water</u>

  • Number of moles = mass in grams / molar mass

  • molar mass of H₂O = 2×1.008 g/mol + 15.999 g*mol = 18.015 g/mol

  • Number of moles of H₂O = 7.9 g / 18.015 g/mol = 0.439 mol

<u>3) Number of moles of Strontium nitrate dehydrated, Sr (NO₃)₂</u>

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  • Molar mass of Sr (NO₃)₂ :  211.63 g/mol (you can obtain it from a internet or calculate using the atomic masses of each element from a periodic table).

  • Number of moles of Sr (NO₃)₂ = 22.9 g / 211.63 g/mol =  0.108 mol

<u>4) Ratio</u>

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Which means that the hydration number is 4.

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