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3 years ago

Would you expect the water or sugar solution to have the most supercooling? WHY? PLEASE HELP

Chemistry

2 answers:

g100num [7]3 years ago

6 0

Answer:

The water solution

Explanation:

Super freezing occurs when energy is quickly withdrawn from a liquid and it cools below the solidification temperature. This phenomenon occurs due to the fact that the cooling is very fast and does not occur the formation of an initial "point" or crystal, which is generally formed to start the freezing. A small crystal formed will attract the molecules nearby, forming a large crystal, that is, the frozen liquid.

The sugar solution should be distilled so that Super Cooling occurs more efficiently than the water solution because the presence of the sugar would create nucleation points and allow the formation of ice crystals. The super cooled water solution turns very quickly into ice, much faster than the sugar solution. It is also possible to supercooled the water after the homogeneous nucleation point, in which case it eventually solidifies into a type of glass.

il63 [147K]3 years ago

3 0

Supercooled water can be prompted to trun into ice by tends to make it more difficult to achieve low nucleation Trehalose and other sugar solutions at low.

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Answer:

1st one= -79.6

2nd one= -80

3rd one= -81.2

Explanation:

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3 years ago

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A mixture of gases is analyzed and found to have the following composition in mol %: CO2 12.0 CO 6.0 CH4 27.3 H2 9.9 N2 44.8 a)

vichka [17]

Answer:

a) CO₂: 21,9%; CO: 7,0%; CH₄: 18,2%; H₂: 0,8%; N₂: 52,1%

b) 24,09 g/mol

Explanation:

a) It is posible to obtain the composition of the gas mixture in weight% using molecular mass of each compound, thus:

12% CO₂× $\frac{44,01g}{1mol}$ = 528,1 g

6% CO× $\frac{28,01g}{1mol}$ = 168,1 g

27,3% CH₄× $\frac{16,05g}{1mol}$ = 438,2 g

9,9% H₂× $\frac{2,02g}{1mol}$ = 20,0 g

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The total mass of the gas mixture is:

528,1g + 168,1g + 438,2g + 20,0g + 1254,4g = 2408,8 g

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CO₂: $\frac{528,1g}{2408,8g}$ ×100 = 21,9%

CO: $\frac{168,1g}{2408,8g}$ ×100 = 7,0%

CH₄: $\frac{438,2g}{2408,8g}$ ×100 = 18,2%

H₂: $\frac{20,0g}{2408,8g}$ ×100 = 0,8%

N₂: $\frac{1254,4g}{2408,8g}$ ×100 = 52,1%

b) The average molecular weight of the gas mixture is determined with mole % composition, thus:

0,12×44,01g/mol + 0,06×28,01g/mol + 0,273×16,05g/mol + 0,099×2,02g/mol + 0,448×28g/mol = 24,09 g/mol

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3 years ago

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Katyanochek1 [597]

Answer: The formula of chromic acid is $H_2CrO_4$

Explanation:

We are given an ionic compound named as chromic acid. This acid is formed by the combination of hydrogen ion and chromate ion.

An acid is defined as the substance which releases hydrogen ion when dissolved in water.

Hydrogen is the 1st element of periodic table having electronic configuration of $1s^1$ .

This element will loose 1 electron to form $H^{+}$ ion.

Chromate ion is a polyatomic ion having chemical formula of $CrO_4^{2-}$

By criss-cross method, the oxidation state of the ions gets exchanged and they form the subscripts of the other ions. This results in the formation of a neutral compound.

So, the chemical formula for the given compound is $H_2CrO_4$

Thus, the formula of chromic acid is $H_2CrO_4$

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