General Chemistry Answers

What does it mean if, during a single replacement reaction, a black substance has formed on top of the Magnesium strip? How would this be described in a lab procedure?

P = 737.2228 mmhg

V = 0.164 L

R = 62.4 L*mmHg/ mole*K

T = 21.0oC = 294.0K 

N=?

how does ionization influence ionic, and covalent bond formation?

A 1.86 mol sample of NOBr is placed in a 5.0 liter evacuated flask at 25oC. Analysis of the mixture at equilibrium shows that 0.164 mol of NO is present.What is the value of the equilibrium constant, Kc for this reaction? 2NOBr⇌2NO+Br2

Identify whether each set of quantum numbers below is ALLOWED or NOT ALLOWED.

_______1. n=3, l=2, m_l=1, m_s=-1/2

_______2.n=2, l=2, m_l=0, m_s=-1/2

_______3.n=1, l=0, m_l=0, m_s=1/2

_______4.n=2, l=1, m_l=-1, m_s=-1/2

_______5.n=3, l=2, m_l=-3, m_s=1/2

When cadmium metal reduces Cu2+ in solution, Cd2+ forms in addition to copper metal. Given that ΔG° = −143 kJ/mol, calculate K at 25°C. What is E°CELL of a voltaic cell that uses this reaction?

Cd(s) + Cu^2+(aq) = Cd^2+(aq) + Cu(s)

Assume a bottle of wine consists of an 11% solution (by weight) of ethanol (C2H5OH) in

water. If the bottle of wine is chilled to −20 °C, will the solution begin to freeze?

You dissolve 15.0 g of sucrose, C12H22O11, in a cup of water (225 g). What is the freezing

point of the solution?

Some ethylene glycol, HOCH2CH2OH, is added to your car’s cooling system along with 5.0

kg of water. If the freezing point of the water–glycol solution is −15.0 °C, what mass of

HOCH2CH2OH must have been added?

A solution of glycerol, C3H5(OH)3, in 735 g of water has a boiling point of 104.4 °C at a

pressure of 760 mm Hg. What is the mass of glycerol in the solution? What is the

mole fraction of the solute?