C6 chemical reactions Flashcards
what is a physical change
- does not alter substance
- only changes appearance
- reversible
what is a chemical change
- alters substance
- reactants diff from products
effect of concentration of solutions on rate of reaction and why
rate increases
- num of particles in given v increase
- frequency of successful collisions increases
effect of pressure of reacting gases on rate of reaction
rate increases
- num of particles per unit v increase
- frequency of successful collisions increase
effect of surface area of solids on rate of reaction
rate increase
- expose more reactant particles to other reactant
- chance of collisions increase
- frequency of successful collisions increase
effect of temperature on rate of reaction
rate increase
- KE of reactant particles increase
- proportion of reactant particles with Ea or more increases
- frequency of successful collisions increase
effect of catalysts on rate of reaction
rate increase
- decrease Ea of reaction
- greater proportion of reactant particles with Ea or more
- increase frequency of successful collisions
- catalysts unchanged at end of reaction
what is collision theory
in order for reactant particles to react together they must
- collide with each other
- collide with enough KE for reaction to occur
relationship between rate of reaction and concentration
directly proportional when in excess
how to investigate rate of reaction
- change in mass of reactant/product
- formation of graph
define redox reactions
- involves simultaneous oxidation and reaction
- involving gain and loss of oxygen
define oxidation
- loss of electrons
- gain of oxygen (increase in oxidation number)
define reduction
- gain of electrons
- loss of oxygen (decrease in oxidation number)
acronym for redox
OIL RIG (electrons)
- Oxidation Is Loss
- Reduction Is Gain
