Rates of Reaction

Which out of the following is NOT a factor that affects the rate of a reaction

• temperature

• concentration

• surface area

• volume

• catalysts

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NGSS.HS-PS1-5

How does a catalyst work in speeding up a reaction?

• by lowering the activation energy (minimum energy needed for the reaction to take place)

• by giving the reactants more energy

• by increasing the number of reactant particles

• by increasing the temperature

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NGSS.HS-PS1-5

The following graph shows two different reaction pathways for the same overall reaction at the same temperature. Which pathway is slower and why?

• Red, because the activation energy is larger
• Blue, because the activation energy is lower
• both reaction progress at the same rate

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NGSS.HS-PS1-4

Why does a higher concentration increase the rate of reaction?

• it increases the amount of reactants

• it lowers the activation energy

• it increases the energy of particle collisions

• it increases the frequency of particle collisions

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NGSS.HS-PS1-5

What makes an effective collision?

• When molecules collide.
• When molecules collide with the proper orientation.
• When molecules collide with proper orientation and enough kinetic energy.
• High Temperature.

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NGSS.HS-PS1-5

Grinding an antacid tablet into powder increases the rate of reaction due to :

• increase in concentration

• increase in surface area

• increase in temperature

• increase in particle size

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NGSS.HS-PS1-5

Which of the following increases the reaction rate?

• less surface area

• lower temperature

• more particle size

• increased concentration

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NGSS.HS-PS1-5

To slow down a chemical reaction you will do one of the following:

• Place the reactants in hot water

• Place the products in an ice bath

• Place the reactants in an ice bath

• Keep stirring the reactants with a stirring rod

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NGSS.HS-PS1-5

Why does breaking up a solid reactant increase the rate of reaction?

• it creates more solid
• it creates more energy
• it increases the surface area
• it increases the concentration

How is this equipment being used to measure the rate of reaction?

• The gas syringe measures how much gas is produced in a certain time

• The reaction mixture will increase in volume in a certain time

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NGSS.HS-PS1-5