Select one:
a.The first law of thermodynamics states that energy cannot becreated or destroyed
b.Gibbs free energy is always a negative value for a spontaneousreaction
c.Specific heat is the quantity of heat needed to change thetemperature of 1 gram of a substance by 1 K
d.An object with a high specific heat capacity requires more thermalenergy to elevate its temperature
e.In an endothermic process heat is transferred to the surroundingsfrom the system.Q42. Which of the following statements regarding energy changes inchemical reactions is incorrect?
Select one:
a.Enthalpy decreases for an endothermic reaction.
b.The change in Gibbs free energy in a spontaneous reaction is alwaysnegative.
c.Entropy of the universe increases.
d.If a chemical reaction is reversed, the magnitude of ΔHr remainsthe same but the sign is reversed.
e.Entropy may be considered as representing the randomness of asystem.
Q43. Activation energy can be considered as the minimum energyrequired for which of the following?
Select one:
a.Transforming the reactants into an activated complex (transitionstate)
b.Doubling the rate of the reaction
c.Enabling all the reactant molecules to react
d.Decreasing the vibrational energy of the molecule
e.Guiding every reactant molecule to a productive collision
- Q41 Thermodynamics Deals With The Flow Of Energy In A System Which Of The Following Thermodynamic Statements Is False 1 (131.36 KiB) Viewed 60 times
Select one:
a.
A catalyst is completely used up in the reaction, it is notregenerated.
b.
A catalyst affects the enthalpy change of the reaction.
c.
The presence of a catalyst decreases the rate of thereaction
d.
A catalyst changes the products that are produced in areaction.
e.
A catalyst increases the rate of a reaction by providing a lowerenergy pathway from the reactants to the products.
Q2.
Which of the following processes is an example of a chemical(NOT a physical) change?
Select one:
a.
Condensation of water on a window
b.
Liquid nitrogen disappearing from a bowl at room temperature
c.
Inflation of a balloon using dry ice CO2(s)
d.
Hydrogen peroxide dental strips whitening teeth
e.
Melting of snow
Q4.
If the imaginary element Yq most commonly forms aYq3+ ion, what would be the formula of the compoundthat would result when it combines withZJ42-to form a neutral compound?
Select one:
a.
Yq3(ZJ4)2
b.
Yq(ZJ4)3
c.
Yq2(ZJ4)6
d.
YqZJ4
e.
Yq2(ZJ4)3
Q5.
1 mole of the imaginary compound(ZJ4)2RM3 would contain whichof the following ratios of atoms:
Select one:
a.
1 mole Z atoms, 4 moles J atoms, 2 moles R atoms and 6 moles Matoms
b.
2 moles Z atoms, 8 moles J atoms, 1 mole R atoms and 3 moles Matoms
c.
1 mole Z atoms, 4 moles J atoms, 1 mole R atoms and 3 moles Matoms
d.
2 moles Z atoms, 8 moles J atoms, 2 moles R atoms and 6 moles Matoms
e.
1 mole Z atoms, 8 moles J atoms, 1 mole R atoms and 3 moles Matoms
The equilibrium constant for the reaction below is best described by the expression: P4(s) + 6F2(g) Select one: a. O b. O C. d. e. K= K = K= = K: = 4[PF3] [P4]+6[F₂] [PF3]4 [F₂]6 [PF3]4 [P4][F₂]6 [P4][F₂]6 [PF3]4 4 K = [PF3] ¹ 4PF3(g) |