General Chemistry Answers

An alloy is prepared by mixing 60g copper and 70g zinc. Find the percentage by mass of copper and zinc.

If 465cm³ of SO2 can diffused through a porous partition in 30secs , how long will 620cm³ of hydrogen sulphide take to diffuse through the same (H=1,S=32,O=16)

400cm³ of gas x diffused through a porous pot in 2 minutes calculate the rate at which gas x diffused

What are the main inadequacies of the Bohr's model?

Rubbing alcohol, C₃H₇OH_(l) is sold as a 73.8 % v/v solution for external use only. What volume of pure C₃H₇OH_(l) is present in a 487 mL bottle? Express your answer to the nearest whole number.

Which term is the catalyst in the following reaction mechanism?

H2O2 + I– —> H2OH + IO–

H2O2 + IO– —> H2O + O2 + I–

a- H2OH

b- IO-

c- H2O2

d- H2O

e- none of the above

• Which element has atoms in the ground state with the greatest number of valence electrons?

“determine the concentration of an unknown Copper Sulphate Solution: by measuring its absorbance and using the slope of the Beer’s Law Curve”.

The reaction 2 NO(g) = N2(g) + O2(g) has a Kc value of 2400 at 2000 K. If 0.850 M each of N2 and O2 are initially present in a 3.00-L vessel, calculate the equilibrium concentrations of No, N2 and O2.

The reaction 2 NO(g) = N2(g) + O2(g) has a Kc value of 2400 at 2000 K. If 0.850 M each of N2 and O2 are initially present in 3.00-L vessel , calculate the equilibrium concentrations of No, N2, and O2.