4th Quarter - scroll down for most recent problems - part of notebook grade - must be hand-written in complete sentences or showing all work with units - answers only will receive no credit. Do not skip spaces between problems, each science practice day will restart with number 1 and the date is written to the left of the margin next to number one.
March 22, 2024
1. Collision theory attempts to explain chemical reactions and physical interactions of molecules.2. An activated complex may either separate into the products or re-form the reactants.
March 25, 2024
1. If colliding molecules have an orientation that favors the reaction, they have the correct angles and distances between atoms.
2. The energy of the activated complex compare with the energies of reactants and products is higher than the energy of both reactants and products.
March 26, 2024
1. In the rate law for the following equation, R=k[A]n[B]m, the units for [A] and [B] are M.
March 27, 2024
1. The statement that correctly describes the energy changes that occur when bonds form and when bonds break is breaking bonds is endothermic, and forming bonds is exothermic.
March 28, 2024
1. The rate for a reaction between reactants L, M, and N is proportional to the cube of [L] and the square of [M]. The rate law for this reaction is R=k[L]3[M]2.
April 01, 2024
1. The equation H2(g) + I2(g) --> 2HI(g) is a(n) overall reaction.
2. Raising the temperature of gas particles increases collision energy but does not increase favorability of orientation.
April 02, 2024
1. Compounds whose enthalpies of formation are highly negative are very stable.
2. The enthalpy of a reaction for a chemical change can be determined by subtracting the total enthalpies of the reactants from that of the products.
April 10, 2024
1. When Keq is larger than 1, this indicates that products are larger than reactants in the equilibrium expression.
2. The chemical equilibrium expression for the following equation: NH4NO3 (s) → N2O(g) + 2H2O(l) is Keq = [N2O].
April 12, 2024
1. Bi2S3 --> Bi+3(aq) + S-2(aq) Ksp = [Bi+3][S-2]
April 15, 2024
1. The equation for the ionization of water is 2H2O(l) -> H3O+(aq) + OH–(aq).
2. The value of K for a system must be measured by experiment.
April 17, 2024
1. Reactions tend to run to completion if a gaseous product forms and escapes.
April 18, 2024
1. An example of a good buffer is HNO2 and NaNO2.
April 19, 2024
1. The Ka values for weak and strong acids compare by Ka (weak) < Ka (strong).
2. The type of reaction that occurs in an aqueous solution of the salt of a weak acid and a strong base is anion hydrolysis.
April 22, 2024
1. The type of reaction occurs in an aqueous solution of the salt of a weak base and a strong acid is cation hydrolysis.
2. Adding sodium acetate to an acetic acid, CH3COOH, solution increases pH and lowers [H+].
March 22, 2024
1. Collision theory attempts to explain chemical reactions and physical interactions of molecules.2. An activated complex may either separate into the products or re-form the reactants.
March 25, 2024
1. If colliding molecules have an orientation that favors the reaction, they have the correct angles and distances between atoms.
2. The energy of the activated complex compare with the energies of reactants and products is higher than the energy of both reactants and products.
March 26, 2024
1. In the rate law for the following equation, R=k[A]n[B]m, the units for [A] and [B] are M.
March 27, 2024
1. The statement that correctly describes the energy changes that occur when bonds form and when bonds break is breaking bonds is endothermic, and forming bonds is exothermic.
March 28, 2024
1. The rate for a reaction between reactants L, M, and N is proportional to the cube of [L] and the square of [M]. The rate law for this reaction is R=k[L]3[M]2.
April 01, 2024
1. The equation H2(g) + I2(g) --> 2HI(g) is a(n) overall reaction.
2. Raising the temperature of gas particles increases collision energy but does not increase favorability of orientation.
April 02, 2024
1. Compounds whose enthalpies of formation are highly negative are very stable.
2. The enthalpy of a reaction for a chemical change can be determined by subtracting the total enthalpies of the reactants from that of the products.
April 10, 2024
1. When Keq is larger than 1, this indicates that products are larger than reactants in the equilibrium expression.
2. The chemical equilibrium expression for the following equation: NH4NO3 (s) → N2O(g) + 2H2O(l) is Keq = [N2O].
April 12, 2024
1. Bi2S3 --> Bi+3(aq) + S-2(aq) Ksp = [Bi+3][S-2]
April 15, 2024
1. The equation for the ionization of water is 2H2O(l) -> H3O+(aq) + OH–(aq).
2. The value of K for a system must be measured by experiment.
April 17, 2024
1. Reactions tend to run to completion if a gaseous product forms and escapes.
April 18, 2024
1. An example of a good buffer is HNO2 and NaNO2.
April 19, 2024
1. The Ka values for weak and strong acids compare by Ka (weak) < Ka (strong).
2. The type of reaction that occurs in an aqueous solution of the salt of a weak acid and a strong base is anion hydrolysis.
April 22, 2024
1. The type of reaction occurs in an aqueous solution of the salt of a weak base and a strong acid is cation hydrolysis.
2. Adding sodium acetate to an acetic acid, CH3COOH, solution increases pH and lowers [H+].