What is indicated when a chemical cell’s voltage has dropped to zero?
The concentration of reactants are increased
Concentration of products are increased
The cell reaction has reached equilibrium
The cell reaction has been stopped
In crystal field theory (CFT), the energy gap between t2g and eg sets is denoted by?
8Dq
10Dq
0Dq
20Dq thermic
For second order reaction, the initial concentration of reactant A is 0.24 M. If the rate constant is 8.1 x 10^-2 M^-1 s^-1, what is the concentration of A after 29 seconds?
0.02 M
0.15 M
0.30 M
0.45 M
Polymers which soften on heating and harden when cooled are?
Cross-liked polymers
Copolymers
Thermosetting polymers
Thermoplastics
Compound Z absorbs light of wavelength 320 nm. A 1.0 x 10^-3 mol dm^-3 solution of a compound Z gives an absorbance reading of 0.15 when placed in a solution cell path 1 cm. What is the value of the molar extinction (absorption) coefficient of Z?
1500 mol^-1 dm^3 cm^-1
0.15 mol^-1 dm^3 cm^-1
1.5 mol^-1 dm^3 cm^-1
150 mol^-1 dm^3 cm^-1
Which of the following statements is not true about precision of data?
It is the variability among replicate measurements
Low standard deviation within measurements mean good precision
It reflects how close the values in a series of results are to each other
It is the difference between the obtained value and the true value
Based on the equations below, which metal is the most active? Pb(NO3)2 (aq) + Ni (s) → Ni(NO2)2 (aq) + Pb (s), Pb(NO3)2 (aq) + Ag (s) → No reaction, Cu(NO3)2 (aq) + Ag (s) → No reaction?
Ni
Ag
Cu
Pb
Which combination will produce a precipitate?
NH4OH (aq) and HCL (aq)
AgNO3 (aq) and Ca(C2H3O2)2 (aq)
NaOH (aq) and Fe(NO3)3 (aq)
NaCl (aq) and HC2H3O2 (aq)
In_____, diffusion current is measured as a function of scanning potential difference.
Chromatography
Potentiometric
Voltammetry
Amperometry
The complexometric titration of the chemical specie cannot be done by using EDTA as titrant?
