Is elemental phosphorus dull or high luster?

1 answer:

3 0

The exception is the element hydrogen. ... solid at room temperature (with the exception of mercury); usually shiny; high melting point; good conductor of ... could be dull or shiny; conducts heat and electricity, but not as well as metals ... allotropes–Phosphorus, Selenium and Carbon (in the form of graphite.) ...

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When doing a recrystallization what observations would prompt

Volgvan

<h2>Observation of purified crystals.</h2>

Explanation:

Recrystallization is the process in which a compound is dissolved in a hot solvent and then allowed to cool which forms the crystals.
It is a technique used for purification of solids.
Recrystallization mainly depends on the solubility of the solvent that means the solid should be soluble in the solvent when it is hot and should be insoluble in the same solvent when it is cool.
The observations while doing recrystallization is to observe the purified crystals obtained and to filter it out.

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3 years ago

Why do we use an object's mass, rather than its weight, to indicate the amount of matter it contains?

aleksklad [387]

Because mass doesn't changed based on location and scientists rely on a property that is constant no matter where the object may be.

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3 years ago

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A small cylinder of helium gas used for filling balloons has a volume of 2.20 L and a pressure of 14300 kPa at 25 ∘C. Part A How

Korvikt [17]

Answer:

You can fill 212 balloons.

Explanation:

First we calculate the helium moles in the small cylinder, using PV=nRT:

P = 14300 kPa ⇒ 14300 * 0.009869 = 141.13 atm

V = 2.20 L

n = ?

R = 0.082 atm·L·mol⁻¹·K⁻¹

T = 25 °C ⇒ 25 + 273.16 = 298.16 K

141.13 atm * 2.20 L = n * 0.082 atm·L·mol⁻¹·K⁻¹ * 298.16 K

n = 12.70 mol

Then we calculate the number of moles that can fit in a single balloon:

1.22 atm * 1.20 L = n * 0.082 atm·L·mol⁻¹·K⁻¹ * 298.16 K

n = 0.0599 mol

Finally we divide the total number of available moles by the number of moles in a single balloon:

12.70 mol / 0.0599 mol = 212.09

So the answer is that you can fill 212 balloons.

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3 years ago

Which of the following consists of positive and negative ions bound together and held in place in a crystalline solid?

lbvjy [14]

Most likely its A . Convalent bonds

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4 years ago

How many kPa is there if you have 300 torr

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sorry need AAAAAAAAAAAAAAAAAA

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4 years ago