Ch_13_I_Intro_Kinetics

Ch_13_I_Intro_Kinetics - Part IRates of Chemical...

Info iconThis preview shows pages 1–5. Sign up to view the full content.

View Full Document Right Arrow Icon
Sheet1 Page 1 Part I&Rates of Chemical Reactions .Rate& how fast something is changing .Rate of change of distance¶ speed .Rate of reaction» how fast a reactant or product is changing with time Factors That Affect Reaction Rates .Nature of reactants .Concentrations of reactants (M, P, surface area) .Temperature .Presence of a catalyst (Part IIx Mechanisms of Chemical Reactions) ( NATURE OF REACTANTS Two allotropes of phosphorus. White phosphorus ignites and burns rapidly when eXposed to oXygen in the air, so it is stored under water. Red phosphorus reacts with air much more slowly, and can be stored in contact with air. Whitten p 617 p CONCENTRATION Dilute sulfuric acid Conc. sulfuric acid Whitten p 634 p TEMPERATURE Antimony powder (Sb) + Br2 25 ºC 75 ºC At which temperature is the reaction faster (more vigorous)
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Sheet1 Page 2 Whitten p 642 p TEMPERATURE Boiling water Ice water Which egg will cook faster? Reaction rates are always faster at higher temperatures! Whitten p 641 p HETEROGENEOUS CATALYST H2 gas Pt gauze McQuarrie p 547 2H2 (g) + O2(g) .2H2O(g) 2 HETEROGENEOUS CATALYST H2O2(aq) . H2O(l) +O2(g) Water boils vigorously Decomposition Reaction rate increases: catalyzed by small Catalysis amounts of transition h Higher temperature (reaction exothermic) metal oxides Whitten p. 648 W RATES OF CHEMICAL REACTIONS (Small Activation Energy)
Background image of page 2
Sheet1 Page 3 Dry NI3 + mild shock N2 +I2 N RATES OF CHEMICAL REACTIONS (Very Large Activation Energy) . . Oxidation Rates Very slow [Kept in dry environment± moisture free] [ Oxidation Rates Very slow Slow Rusting Rates 2 .2Fe + 3O HO ® Fe O . ¾¾¾ . 2 23 . . Oxidation Rates Very slow Slow Sparkling Oxidation Rates Very slow Slow Sparkling Fast
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Sheet1 Page 4 2HO (aq )® 2HOl () + O ( g HO (aq )® 2HOl () + O ( g ) 22 22 Initially all hydrogen peroxide and water I 2HO (aq )® 2HOl () + O ( g HO (aq )® 2HOl () + O ( g
Background image of page 4
Image of page 5
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 18

Ch_13_I_Intro_Kinetics - Part IRates of Chemical...

This preview shows document pages 1 - 5. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online