Energy changes and reversible reactions

This symbol indicates that a reaction is ____________

• reversible
• irreversible

Which of these is NOT a reversible change?

• Water to Ice
• Juice to ice lolly
• Cookie Dough to Cookie
• Melting Chocolate

Le Chaltelier's Principle states that if a chemical system at equilibrium is stressed,

• the system will adjust to increase the stress
• the system will adjust to reduce the stress
• the system will not adjust

Define chemical equilibrium.

• A reaction is reversible.
• The concentration of the reactants is equal to the concentration of the products.
• The rate of a forward reaction is equal to the rate of the reverse reaction.
• The reaction stops and no further change in concentration occurs.

Tags

NGSS.HS-PS1-6

For the reaction...
SO₂ + O₂  <−>  SO₃
If the concentration of SO₂ is increased, the equilibrium of the reaction will shift ___________.

• left
• right
• left and right 
• neither left nor right

Tags

NGSS.HS-PS1-5

For the reaction...
SO₂ + O₂ <−>  SO₃
If the equilibrium shifts to the right, the concentration of O₂ will ___________.

• increase
• decrease
• remain the same
• double

Tags

NGSS.HS-PS1-5

NGSS.HS-PS1-6

For the reaction...
SO₂ + O₂ <−>  SO₃
If the concentration of O₂ is decreased, the equilibrium of the reaction will shift ___________.

• left
• right
• left and right
• neither left nor right

Tags

NGSS.HS-PS1-5

For the reaction...
heat  +  N₂  +  O₂  <−>  2NO
If  O₂ is removed, the  concentration of N₂ will _______.

• increase
• decrease
• remain the same
• double

Tags

NGSS.HS-PS1-5

For the reaction...
N_{2 (g)} +  3 H_2 (g) <−> 2 NH_{3 (g)}

If the pressure in the system is increased,  which substance will increase in concentration?

• N₂
• H₂
• N₂ and H₂
• NH₃

2A + 3B  <---->  2AB
The forward reaction points towards the __________.

• left
• right
• up
• down