Kinetics and Equilibrium Review

When  ΔH is positive it represents a(n) 

• exothermic   reaction 
• endothermic reaction 

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NGSS.HS-PS1-4

When  ΔH  is negative it represents a(n)

• exothermic reaction 
• endothermic reaction 

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NGSS.HS-PS1-4

• The graph represents an exothermic reaction 
• The graph represents a specific heat reaction 
• The graph represents a constant pressure reaction 
• The graph represents an endothermic reaction 

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NGSS.HS-PS1-4

• The graph represents an exothermic reaction 
• The graph represents a specific heat reaction 
• The graph represents a constant pressure reaction 
• The graph represents an endothermic reaction 

Tags

NGSS.HS-PS1-4

The picture shows a reversible chemical reaction taking place. How can equilibrium be reached?

• Stopper the flask.
• Add more reactants.
• Add more products.
• Cool the contents.

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NGSS.HS-PS1-5

NGSS.HS-PS1-6

How does a catalyst change during a reaction?

• It is part of the products
• It combines with the reactants
• It precipitates
• It remains unchanged

How do catalysts increase the rate of reaction?

• The frequency of collisions is the increased
• the activation energy is lowered
• the energy of collisions is increased
• Both the frequency and energy of collisions is increased

Tags

NGSS.HS-PS1-5

Given the reaction at equilibrium: 
2SO₂(g) +O₂(g) <--> 2SO₃(g) + HEAT
Which change will shift the equilibrium to the right?

• increasing the temperature
•  increasing the pressure
•  decreasing the amount of SO₂(g)
• decreasing the amount of O₂(g)

Tags

NGSS.HS-PS1-5

NGSS.HS-PS1-6

Which process is accompanied by a decrease in entropy?

• boiling of water
• condensing of water vapor
• subliming of iodine
• melting of ice

Given the reaction at 25^oC:
Zn(s) + 2 HCl(aq) --> ZnCl₂(aq) + H₂(g)
The rate of this reaction can be increased by using 5.0 grams of powdered zinc instead of a 5.0-gram strip of zinc because the powdered zinc has

• lower kinetic energy
•  lower concentration
• more surface area
• more zinc atoms

Tags

NGSS.HS-PS1-5