what color is methyl orange indication in
a) acidic
b) alkaline
solutions
a) red
b) yellow
what color is phenolphthalein indication in
a) acidic
b) alkaline
solutions
a) cloudless
b) pink
give the formula to calculate energy change
e= m x 4.2 x temp change
give the formula for molar enthalpy change (change in H)
change in H= - energy change/n
breaking bonds is…?
endothermic
how does increased surface area affect rates of reaction?
there are more SITES where the reaction can occur
how does increased concentration increase rate of reaction
there are more particles per unit volume; more FREQUENT and SUCCESSFUL collisions
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
define a catalyst
something that speeds up a reaction without getting used up
how does a catalyst speed up a reaction
provides an alternative pathway with a lower activation energy
what colour is litmus paper in
a) acidic
b) alkaline
solutions
a) red
b) blue