Why do chemical reactions take place

Question 1

Why do many spontaneous reactions involve mixing, spreading out? e.g. evaporation, dissolving, gases mixing

Answer 1

• tendency towards randomising or disordering

Question 2

How do randomness of particles change depending on their state?

Answer 2

• gases most random solids least
• because of the arrangement of their particles

Question 3

What are the factors that lead to spontaneous reactions?

Answer 3

• exothermic
  
  • tends to be feasible to occur spontaneous
• endothermic
  
  • potentially spontaneous when they involve disordering
  • arrangement becomes more random

Question 4

What is entropy?

Answer 4

• the randomness of a system, expressed mathematically
• symbol S

Question 5

What is the value for ΔS for a reaction where the products are more disordered?

Answer 5

• positive

Question 6

How do values of S vary between solids liquids and gases?

Answer 6

gases have highest value