Question : 41.Characterize EACH of the three given statements as being TRUE : 1309621

 

 

41.Characterize EACH of the three given statements as being TRUE or FALSE and then indicate the collective true-false status of the statements using the choices:

(1) Electron loss is always associated with an increase in oxidation number.

(2) An exothermic reaction occurs when the energy required to break bonds in reactants is less than the energy released by bond formation in the products.

(3) The concentrations of pure liquids and pure solids are never included in an equilibrium constant expression because such concentrations never change.

a.All three statements are true.

b.Two of the three statements are true.

c.Only one of the statements is true.

d.None of the statements is true.

 

 

 

42.Characterize EACH of the three given statements as being TRUE or FALSE andthen indicate the collective true-false status of the statements using the choices:

(1) The square brackets associated with a general equilibrium constant expression mean that concentrations must be expressed in terms of molarity.

(2) Pressure changes affect all chemical systems at equilibrium in which gaseous reactants or products are present.

(3) In the compound KMnO4, the oxidation number of Mn is +3.

a.All three statements are true.

b.Two of the three statements are true.

c.Only one of the statements is true.

d.None of the statements is true.

 

 

 

43.Characterize EACH of the three given statements as being TRUE or FALSE and then indicate the collective true-false status of the statements using the choices:

(1) When reactants are in the solid state, reaction rate increases as temperature increases and decreases as state of subdivision increases.

(2) An oxidizing agent causes oxidation by providing electrons for the other reactant to accept.

(3) The numerical value of an equilibrium constant must always be greater than one.

 

a.All three statements are true.

b.Two of the three statements are true.

c.Only one of the statements is true.

d.None of the statements is true.

 

 

 

44.Characterize EACH of the three given statements as being TRUE or FALSE and then indicate the collective true-false status of the statements using the choices:

(1) Decomposition reactions and addition reactions are two terms that describe the same type of reaction.

(2) Orientation relative to one another, at the moment of collision, is always a factor in determining whether a collision is effective.

(3) An increase in temperature will always cause an endothermic reaction at equilibrium to shift in the direction that produces more products.

a.All three statements are true.

b.Two of the three statements are true.

c.Only one of the statements is true.

d.None of the statements is true.

 

 

 

45.Characterize EACH of the three given statements as being TRUE or FALSE andthen indicate the collective true-false status of the statements using the choices:

(1) Of the known atmospheric greenhouse gases, CO2 is both the most abundant and also the most efficient at preventing heat loss from the Earth.

(2) Ozone is a form of oxygen in which there are three atoms per molecule.

(3) A decrease in body temperature slows down the rate of chemical reactions.

a.All three statements are true.

b.Two of the three statements are true.

c.Only one of the statements is true.

d.None of the statements is true.

 

 

 

46.Assign the following reaction to one of the reaction classifications given in the response list:  2NO2 + H2O2 ? 2HNO3

a.decompositionc.displacement

b.combinationd.exchange

 

 

 

47.Assign the following reaction to one of the reaction classifications given in the response list:  Mg + 2HCl ? MgCl2 + H2

a.decompositionc.displacement

b.combinationd.exchange

 

 

 

48.Assign the following reaction to one of the reaction classifications given in the response list:  K2CO3 ? K2O + CO2

a.decompositionc.displacement

b.combinationd.exchange

 

 

 

49.Assign the following reaction to one of the reaction classifications given in the response list:  KCN + HCl ? HCN + KCl

a.decompositionc.displacement

b.combinationd.exchange

 

 

 

50.Assign the following reaction to one of the reaction classifications given in the response list:  4PH3 + Ni(CO)4 ? 4CO + Ni(PH3)4

a.decompositionc.displacement

b.combinationd.exchange