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stiv31 [10]
3 years ago
6

How do you use the changes in the phase of water to keep you cool?

Chemistry
1 answer:
sineoko [7]3 years ago
8 0

Answer:

by freezing

Explanation:

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c) If 21.0 g of potassium reacts with 62.5 g of barium nitride, what mass of potassium nitride will be produced?
MAXImum [283]

Explanation:

21.0 g of potassium reacts with 62.5 g of barium nitride, what mass of potassium nitride will be produced

8 0
3 years ago
Which of the following refers to the horizontal rows of the periodic table?
maks197457 [2]

Answer:

B. Periods

Explanation:

The horizontal rows in the periodic table are periods.

on the picture below, u can see an example

4 0
3 years ago
A solution is prepared by dissolving 27.0 g of urea [(NH2)2CO], in 150.0 g of water. Calculate the boiling point of the solution
andrew11 [14]

<u>Answer:</u> The boiling point of solution is 101.56°C

<u>Explanation:</u>

Elevation in boiling point is defined as the difference in the boiling point of solution and boiling point of pure solution.

The equation used to calculate elevation in boiling point follows:

\Delta T_b=\text{Boiling point of solution}-\text{Boiling point of pure solution}

To calculate the elevation in boiling point, we use the equation:

\Delta T_b=iK_bm

Or,

\text{Boiling point of solution}-\text{Boiling point of pure solution}=i\times K_b\times \frac{m_{solute}\times 1000}{M_{solute}\times W_{solvent}\text{ (in grams)}}

where,

Boiling point of pure water = 100°C

i = Vant hoff factor = 1 (For non-electrolytes)

K_b = molal boiling point elevation constant = 0.52°C/m.g

m_{solute} = Given mass of solute (urea) = 27.0 g

M_{solute} = Molar mass of solute (urea) = 60 g/mol

W_{solvent} = Mass of solvent (water) = 150.0 g

Putting values in above equation, we get:

\text{Boiling point of solution}-100=1\times 0.52^oC/m\times \frac{27\times 1000}{60\times 150}\\\\\text{Boiling point of solution}=101.56^oC

Hence, the boiling point of solution is 101.56°C

5 0
3 years ago
In the induced fit model of enzymes, a substrate associates itself with which part of an enzyme?
NNADVOKAT [17]
Hello.

Active site of the enzyme.

Have a nice day
8 0
3 years ago
Describe why the periodic table needed to be reordered in 1913.
Norma-Jean [14]

Answer:

1913. Henry Moseley determined the atomic number of each of the known elements. He realized that, if the elements were arranged in order of increasing atomic number rather than atomic weight, they gave a better fit within the 'periodic table'.

Explanation:

GOO

7 0
2 years ago
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