Rates of Reactions

Question 1

collision theory

Answer 1

for chemical reactions to happen, the reactants collide with one another with the correct amount of kinetic energy for a reaction to occur. this minimum energy needed for a reaction to start is activation energy. so if particles have the correct amount of energy, then a collision will be successful, provided the particles have the right orientation in order to react.

Question 2

greater number of collisions =

Answer 2

greater rate of reaction

Question 3

what is the effect on rate of reaction if change concentration of solution

Answer 3

• if decrease concentration of an acid, the rate of reaction will also decrease
• if increase concentration of the reactants, the rate will increase, more collisions as more particles moving

Question 4

what is the effect on rate of reaction if change SA of solids

Answer 4

• when size of solid is small, SA will be at its highest, particles have high change of collisions and faster rate of reaction
• when side of solid is big, SA will be smaller and particles have low change of collisions and slow rates of reactions

Question 5

what is the effect on rate of reaction if change temperature

Answer 5

• if increase temp, particles gain more energy and move faster, colliding more, with more energy, likely to reach activation energy, reaching a high rate of reaction and successful collisions

Question 6

what is the effect on rate of reaction if change pressure of gases

Answer 6

• if increase pressure, more particles/unit of volume, more collisions and increase rate of reaction

Question 7

what is the effect on rate of reaction if add or remove catalysts

Answer 7

• if add catalysts, rate of reaction will increase as gain kinetic energy and move faster. also catalysts lower the activation energy needed therefore higher changes of collisions/second occurs

Question 8

what do catalysts do

Answer 8

increase the rate of chemical reactions by lowering the activation energy needed without changing at the end of the reaction

Question 9

what is a rate of reaction

Answer 9

measure of change that happens in a single unit of time during a reaction