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Flashcards in Reaction Rates Deck (20)
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1

The collision theory contains what two factors?

1. Hard hit
2. Aligned hit

2

Enthalpy

The potential energy change of a reaction

3

Standard writing of reaction and notation form

A+B+250KJ——>AB

A+B—->AB. /\H=250KJ

4

Reaction rate formula

-/\[A]=/\[B]
—— ——
/\t. /\t

Mol/L*s. M/s

5

Instantaneous rates

Is specific to a given time not over a period of time. Found by calculating the slope of a tangent of the curve.

Rise =/\[A]
—————
Run. /\t

6

Factors that affect rate of rxn- influence collisions

1. Nature of reactants (chemical bonds, states)
2. Concentration
3. Temperature
4. Pressure of gases
5. Surface area
6. Catalyst or inhibitor

7

Ions in solution....
Acids/bases...
Molecular vs ionic...
Aqueous/ liquids....
Homogenous (one state)....

Higher
Higher
Lower molecular
Higher
Higher

8

Rates of consumption=
Rate of production=
Rate of disappearances=

Reactant
Product
Reactant

9

Rate=

The change in the amount of reactant or product per unit time

10

Activation energy

Minimum energy colliding particles or product per unit time to react

11

Activated complex

Unstable arrangement momentarily at peak of activation energy where transition occurs

12

Catalyst

Substance the increases the rate of reactions whiteout being used up during the reactions by allowing reactions to proceed along lower energy paths.

13

Which factor affects the rate of heterogenous reactions but not affect the rate of homogenous reactions?

Surface area

14

Reaction mechanism

A series of simple steps involving chemical collisions when added added result in the overall reaction.

15

Intermediate

The product of a reaction that immediately becomes a reactant in another reaction.

16

Rate determining step

The slowest of the steps which has the highest Ea

17

Where can you find a catalyst in a reaction mechanism?

Left side then right side

18

When can the rate law be derived?

Wheat all factors that affect a rate of reaction are held constant except concentration

19

Zero order

When the change in concentration has no effect on the rate.

20

Overall order

Sum of all orders