Unit 5.3 - Rates of Chemical Reactions

Question 1

Catalysts

Answer 1

chemicals that help speed up reactions but are not consumed during reaction. They do two things:

reduces amount of energy require to convert reactants into products

makes it easier for reactant molecules to collide and form products

Question 2

Surface Area

Answer 2

more particles reacting at the same time means faster reaction rate
smaller pieces : larger area

Question 3

Concentration

Answer 3

amount of reactant present in a particular volume of liquid or gas during reaction

higher concentration : faster reaction bc more likely to collide and react

Question 4

Collision Theory

Answer 4

Before particles can react they must collide

1. reactant particles approach each other
2. collision forms activated complex
3. product particles move away

Question 5

Temperature

Answer 5

higher temp : increase rate of reaction

Increase of temp increases the speed of the particle in liquids and gases.

Consequently, particles collide more frequently, so more chemical reactions occur in a shorter time span

Question 6

Factors that affect Rate of Reaction

Answer 6

temperature
concentration of reactants
surface area
agitation
catalysts

Question 7

Rate of Reaction

Answer 7

speed at which chemical reaction proceeds

Question 8

Solubility

Answer 8

able to be dissolved in liquid

Question 9

Agitation

Answer 9

stirring or mixing to create faster reaction
ensures reactants are being kept in contact by removing build up of products around reactants which slow reaction as it creates a barrier