why are rates of reactions faster when there is a bigger surface area or concntration or temprature?

Answer 1

More of a chance for an effective collision so the reactants can interact.

Bigger surface area = more chances of interaction, more space for the reaction to occur, more room for the chemicals to come in contact with each other.

Higher concentration = more atoms and molecules to increase the chances of them meeting each other and reacting.

Higher temperature = more movement of the molecules. More movement means better chances of the reactants hitting with enough energy for the reaction to occur.

Answer 2

Concentration means there are more reactants "flying" around, so they have more chances to bump into each other and react. It's the difference between having 10 people in a room and 100 people in the same room.

Temperature is a measure of how fast they are moving (more or less). So higher temp means faster, means more chances for collisions.

Higher surface area means that there are more sites to react. If there are 10 sites per sq. inch and you have 1 sq. inch of reactant (or catalyst), then you have 10 reaction sites, right? But if you have 10 sq. inches (more surface area!) then you have 100 sites to react.

Answer 3

More surface area means that there is more of each reactant to come into reactive contact. For instance - I big lump of sugar dissolves in tea slower than if you put in lots of granules because the water can only get to a part of the sugar - with granules however can all start dissolving at once.

Temperature affects reactions because heat is actually a result of the energy of the atomic particles withing a substance. The particles move around faster and with more energy. Particles that move faster are more likely to come into contact with other particles and hit them harder - providing more individual reactions per second than slower moving ones.

Concentration - more particles of the reactant available for reacion.

Answer 4

Basically faster reaction depends upon:-

1. Effective collision between molecules
2. Molecules must have effevtive energy(thresold) to change in to products.

Rest you can find out...