K and Q End of Period Review

Catalysts permit reactions to proceed along a ___________energy path.

• lower
• higher

Smaller particle size allows for a _________ surface area to be exposed for the reaction.

• larger
• smaller

The ___________ the surface area of the reactants, the faster the reaction rate.

• larger 
• smaller

Tags

NGSS.HS-PS1-5

The rate of a chemical reaction is NOT affected by which of the following:

• temperature
• concentration
• particle size (surface area)
• All of these affect reaction rates

Tags

NGSS.HS-PS1-5

The rate of a reaction increases as temperature__________________.

• Decreases
• Increases
• Stays the Same

Tags

NGSS.HS-PS1-5

Exothermic reactions release heat to the surroundings.

• true
• false

Tags

NGSS.HS-PS1-4

When K is large, 

• There are more products than reactants when the reaction reached equilibrium.
• There are more reactant than products when the reaction reached equilibrium.
• The amount of reactants is equal to the amount of products.

Tags

NGSS.HS-PS1-6

Consider the following reaction :    
SO_{2 (g)} +  NO_{2 (g)} ↔ SO_{3 (g)} + NO (g)  
had reached a state of equilibrium, was found to contain   0.40 M SO₃ , 0.30 M NO, 0.15 M NO₂ , and 0.20 M SO₂. Calculate the equilibrium constant  for this reaction.

• 4
• .42
• .25
• 1

Tags

NGSS.HS-PS1-6

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

Consider the following reaction. What would be the equilibrium constant expression?
4Br₂(g) + CH₄(g) ↔  4HBr(g) + CBr₄(g)

• [Br₂]⁴  [CH₄]/ [HBr]⁴  [CBr₄]
• [HBr]⁴ [CBr₄]/ [Br₂]⁴ [CH₄]
• [HBr ]/ [Br₂]⁴ [CH₄]
• [HBr]⁴ [CBr₄]/ [Br₂]⁴ [CH]⁴

Tags

NGSS.HS-PS1-6

NGSS.HS-PS1-7