{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

Chapter 13

# Chapter 13 - Rates of the reactions Reaction rates are...

This preview shows pages 1–6. Sign up to view the full content.

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

View Full Document
Rates of the reactions Reaction rates are affected by: a. Concentration b. Pressure (for gaseous reactions) c. Surface area d. Presence of a catalyst.
Initial and instantaneous reaction rates Measurement of reaction rates: A parameter that could be easily measured is selected to measure rates of reaction. Graph is plotted. Initial reaction rate: Rate at t = 0. Instantaneous rate: Plot concentration-time graph. Select the time point. Draw the tangent at that point. Determine the slope of the tangent.

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

View Full Document
Rate law: effect of concentration on reaction rates Reactions might be reversible. For defining rate law, the reverse reaction is neglected. a A + b B….. g G + h H…. Rate law: rate = k[A] m [B] n ….. k=rate constant m, n, …. = order of the reaction with respect to the specific reactant. Over all order of the reaction = m + n + ….. The order of the reaction determines how the rate depends on concentration of the reactant . Order is an experimentally determined quantity. Order might/might not be equal to the stoichiometric coefficient. Can be 0, positive number, negative number or a fraction. Larger k faster reaction k depends on the reaction, temperature and presence of catalyst.
Zero order reactions aA Products Rate = k[A] 0 Rate = k [A] t = -kt + [A] 0 A plot of [A] t against time is a straight line with slope = -k and y-intercept is [A] 0 .

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

View Full Document
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

### Page1 / 17

Chapter 13 - Rates of the reactions Reaction rates are...

This preview shows document pages 1 - 6. Sign up to view the full document.

View Full Document
Ask a homework question - tutors are online