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Flashcards in Physical Chemistry Deck (11):
1

what color is methyl orange indication in
a) acidic
b) alkaline
solutions

a) red
b) yellow

2

what color is phenolphthalein indication in
a) acidic
b) alkaline
solutions

a) cloudless
b) pink

3

give the formula to calculate energy change

e= m x 4.2 x temp change

4

give the formula for molar enthalpy change (change in H)

change in H= - energy change/n

5

breaking bonds is...?

endothermic

6

how does increased surface area affect rates of reaction?

there are more SITES where the reaction can occur

7

how does increased concentration increase rate of reaction

there are more particles per unit volume; more FREQUENT and SUCCESSFUL collisions

8

how does increased temperature affect rate of reaction

the particles have more energy because they move faster; more frequent collisions and greater proportion of more successful collisions

9

define a catalyst

something that speeds up a reaction without getting used up

10

how does a catalyst speed up a reaction

provides an alternative pathway with a lower activation energy

11

what colour is litmus paper in
a) acidic
b) alkaline
solutions

a) red
b) blue