Chemistry > QUESTIONS & ANSWERS > CHEM 1043 Review N°3 (chapters 13 and 14 ) with answers (All)

CHEM 1043 Review N°3 (chapters 13 and 14 ) with answers

Document Content and Description Below

CHEM 1043 Review N°3 (chapters 13 and 14 )1. For the reaction 2A + 3B → 4C + 5D, the rate of the reaction in terms of ΔA would be written as __________ a. –ΔA/Δt. d. +1/2 ΔA/Δt. b. –1/... 2 ΔA/Δt. e. –2 ΔA/Δt. c. +ΔA/Δt. ANS: B -1 ΔA 2 Δt A is a reactant and it is disappearing, the sign must be negative. As 2 moles, the ratio of disappearing is 1/22. Which of the following is not a possible graph of concentration versus time for a reactant? a. b. d. c. ANS: C The graph for the rate of reaction of a reactant should have negative slope3. In the combustion of methane, CH 4(g) + 2 O2(g) → CO2(g) + 2 H2O (g), which reactant has the greatest rate of disappearance? ANS: B According to the stoichiometry oxygen disappear with twice the rate than methane a.CH 4 b. O2 c. CO2 d. H2O e. CH 4 and O2 have the same rate of disappearance.4. Ammonia gas (NH3) is produced from hydrogen and nitrogen gas according to the following reaction: 3H 2(g) + N2(g) → 2NH3(g) If the rate of production of ammonia is R(NH3), what is the rate of loss of hydrogen and nitrogen gas, respectively? ANS: C a. –R(H2) = 2/3 R(NH3); –R(N2) = 1/2 R(NH3) b. –R(H2) = 3/2 R(NH3); –R(N2) = 2 R(NH3) c. –R(H2) = 3/2 R(NH3); –R(N2) = 1/2 R(NH3) d. –R(H2) = 2/3 R(NH3); –R(N2) = 2 R(NH3) e. –R(H2) = R(NH3); –R(N2) = R(NH3) Or : ‒1/3 Δ[H2]/Δt = ‒Δ[N2]/Δt = +1/2Δ[NH3]/Δt Replacing +Δ[NH3]/Δt = R(NH3) then: ‒R(H2) = 3/2R(NH3) and ‒R(N2) = 1/2 [Show More]

Last updated: 2 years ago

Preview 1 out of 42 pages

Buy Now

Instant download

We Accept: