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3 years ago

Which element exhibits a crystalline structure at STP? 1)F 2)CI 3)Br 4) I

Chemistry

1 answer:

umka21 [38]3 years ago

6 0

It would be F only because I wouldn’t make sense CI doesn’t exhibit crystalline neither does BR so F

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Pilots often use waves of about 2.340m to communicate. what is the frequency of the wave ?why?

uranmaximum [27]

All of the various light waves move with the same speed, a value

abbreviated (c) equal to 3.00 × 108 m/s. The frequency ([1]) that light waves pass a given point is

measured in waves/second or simply ‘per second’ (1/s).

the frequency of the wave f = (3.00 × 10^8 m/s)/ 2.340 m

f = 1.28x10^8 Hz

3 0

3 years ago

Which of the following substances are largely ionic?

Vesna [10]

The substances largely ionic are:

NF3
N2
BrF3
PCl3

5 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]

Answer: The boiling point of solution is 101.56°C

Explanation:

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

Which of the following processes rearranges atoms into new molecules during a reaction?

Andreyy89

C burning
Because melting is incorrect lol

4 0

3 years ago

Does the entropy (△S) increase or decrease in each of the following processes? The wind blows a pile of leaves all over the yard

garik1379 [7]

B, increasing decreasing is my opinion

6 0

3 years ago