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Flashcards in Physical Chemistry Deck (11)
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1
Q

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

A

a) red

b) yellow

2
Q

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

A

a) cloudless

b) pink

3
Q

give the formula to calculate energy change

A

e= m x 4.2 x temp change

4
Q

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

A

change in H= - energy change/n

5
Q

breaking bonds is…?

A

endothermic

6
Q

how does increased surface area affect rates of reaction?

A

there are more SITES where the reaction can occur

7
Q

how does increased concentration increase rate of reaction

A

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

8
Q

how does increased temperature affect rate of reaction

A

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

9
Q

define a catalyst

A

something that speeds up a reaction without getting used up

10
Q

how does a catalyst speed up a reaction

A

provides an alternative pathway with a lower activation energy

11
Q

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

A

a) red

b) blue