Kinetics and Equilibrium

If a catalyst is added to a system at equilibrium and the temperature and pressure remain constant, there will be no effect on the

• rate of the forward reaction
• activation energy of the reaction
• rate of the reverse reaction
• heat of reaction

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NGSS.HS-PS1-6

Two reactant particles collide with proper orientation.The collision will be effective if the particles have

• high activation energy
• high ionization energy
• sufficient kinetic energy
• sufficient potential energy

Adding a catalyst to a chemical reaction changes the rate of reaction by causing

• a decrease in the activation energy
• an increase in the activation energy
• a decrease in the heat of reaction
• an increase in the heat of reaction

Tags

NGSS.HS-PS1-5

A piece of Mg(s) ribbon is held in a Bunsen burnerflame and begins to burn according to the equation:
2Mg(s) + O2 (g)  −>   2MgO(s).
The reaction begins because the reactants

• are activated by heat from the Bunsen burner flame
• are activated by heat from the burning magnesium
• underwent an increase in entropy
• underwent a decrease in entropy

Tags

NGSS.HS-PS1-5

Compared to the rate of inorganic reactions, the rate of organic reactions generally is

• slower because organic particles are ions

• slower because organic particles contain covalent bonds which take a long time to break

• faster because organic particles are ions

• faster because organic particles contain covalent bonds

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NGSS.HS-PS1-5

When one mole of a certain compound is formed from its elements under standard conditions, it absorbs 85 kiloJoules of heat. A correct conclusion from this statement is that the reaction has a

• ΔH equal to –85 kJ/mole
• ΔH equal to +85 kJ/mole
•  Δequal to –85 kJ/mole
•  Δequal to +85 kJ/mole

Tags

NGSS.HS-PS1-4

Which interval represents the activation energy of the forward reaction?

• A
• B
• C
• E

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NGSS.HS-PS1-4

Which interval represents the heat of reaction for the reaction?

• A
• B
• D
• E

Tags

NGSS.HS-PS1-4

Interval C in this potential energy diagram could be changed by adding a ________?

• Cookies
• More energy
• Catalyst
• Changing the temperature

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NGSS.HS-PS1-4

NGSS.HS-PS1-5

Given the reaction:

CH₄(g) + 2 O₂(g) --> 2 H₂O(g) + CO₂(g)

What is the overall result when CH₄(g) burns according to this reaction?

• Energy is absorbed and H is negative.Δ

• Energy is absorbed and ΔH is positive.

• Energy is released and ΔH is negative.

• Energy is released and ΔH is positive

Tags

NGSS.HS-PS1-4