A)What charge does bromine adopt when it ionizes? -Rationalize this charge in te

Question

A)What charge does bromine adopt when it ionizes?

-Rationalize this charge in terms of the electronic configuration for bromine.

B)A 500 mL flask contains 0.825 grams of oxygen gas at a pressure of 734 torr.  What is the temperature of the gas?

C)Explain how an unknown sample can be classified experimentally as an element, a compound, or a mixture.

D)Suppose a two liter soda bottle will explode if the pressure inside a sealed bottle exceeds 5 atm.  If 15.0 grams of liquid nitrogen is placed inside a sealed bottle at 22 °C , will the bottle explode when all the liquid evaporates and is converted to gas?

Explanation / Answer

A) the electronic configuration of bromine is

[Ar] 4s2 3d10 4p5

so to complete its octet is seeks one electron, hence it readily accepts and electron to form a negative ion(Br-) with electronic configuration

[Ar] 4s2 3d10 4p6

B) We will assume that oxygen will behave as ideal gas so

PV = nRT

n = moles = Mass / Molecular weight = 0.825 / 32 = 0.0258

R = Gas constant = 0.0821 L atm / mole Kelvin

T = temperature = ?

P = pressure = 734 Torr = 0.966 atm

V = volume = 500mL = 0.5 L

T = PV / nR = 0.966 x 0.5 / 0.0821 X 0.0258 = 228.05 Kelvin

C) We may determine the melting and boiling point first.

(i) a well defined melting / boiling point signifies the sample is an element (purest form)

(ii) If the mixture is dissolved in some solvent or distilled off (if liquid) and it gives two or more samples then it is mixture else it is compound.

D) The pressure of gas will be calculated as

PV = nRT

n = mass / Mol wt = 15 / 28 = 0.536

Pressure = 0.536 X 0.0821 X (273+22) / 2 = 6.5 atm

So yes it will explode

Related Questions

Navigate

• Browse (All)
• Browse A
• Subjects

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.