Progress of Chemical Reaction

What is rate?

• The measure of how much something changes within a specific time

• The velocity of light in vacuum.

• Speed of light.

• The measure of the volume of products.

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In Chemistry, the rate of reaction is:

• time over concentration.

• change of the amount of reactant or product per time.

• concentration over volume.

• change of the amount of reactant only.

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NGSS.HS-PS1-5

In (a), the energy is:

• Exothermic.

• Athermic.

• Endothermic.

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NGSS.HS-PS3-1

• Negative.

• Postivie.

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An endothermic reaction absorbs heat, and an exothermic reaction releases heat.

• True.

• False.

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NGSS.HS-PS1-4

In (A), no reaction occurs, we say, it is:

• Ineffective collision.

• Effective collision.

Unstable arrangement of atoms that forms for a moment at the peak of the activation energy barrier is:

• Inactivated complex.

• Collision theory.

• Activated complex.

• Barrier.

For a chemical reaction to occur and have an effective collision:

• Particles must collide.

• Particles must collide at proper orientation.

• Particles must have enough kinetic energy to cross the activation energy barrier.

• All of the above.

Which factor best describes this image?

• Effect of particle size on reaction rate.

• Effect on concentration on reaction rate.

• Effect of temperature on reaction rate.

• Effect of catalyst on reaction rate.

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NGSS.HS-PS1-5

What does MnO₂ represent in the tube (b)?

• An inhibitor.

• A product.

• A catalyst.

• An enzyme.