Kinetics & Thermodynamics

What two factors govern whether a collision between reacting particles will be effective?

• orientation and potential energy 
• kinetic energy and temperature 
• kinetic energy and orientation 
• potential energy and kinetic energy 

Decreasing the particle size increases the reaction rate because

• It makes particles move faster
• It increases the likelihood of collisions with the correct geometry
• It decreases the surface area available to react
• It increases the number of collisions

Tags

NGSS.HS-PS1-5

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

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

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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

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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)

According to Table I, 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

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NGSS.HS-PS1-4

In table I the reaction of hydrogen and oxygen to form water is best described as

• exothermic, because energy is released
• endothermic, because energy is released
• exothermic, because energy is absorbed
• endothermic, because energy is absorbed

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NGSS.HS-PS1-4