Rate of reactions

Physical change

Change that doesn’t result in formation of new substances and can be reversed

Chemical change

Change that results in formation of new substances but can’t be reversed

Exothermic reaction

Chemical reaction that lets out heat

Endothermic reaction

Chemical reaction that absorbs heat

Activation energy

Minimum amount of energy required to start a chemical reaction

Rate of chemical reaction

Speed at which a chemical reaction takes place

Rate of reaction formula

Change in concentration of reactant divided by time taken

Temperature (factor affecting ROR)

Higher temperature results to more charged particles making them likely to react

Particle size (factors affecting ROR)

Small particles have larger surface area which increases ROR

Concentration (factors affecting ROR)

More of the substance increases the chance of molecules colliding to speed up reaction

Catalyst (factors affecting ROR )

Lowers the activation energy and can be reused é.g enzymes