Kinetics Practice Problems

What is the best definition of rate of reaction?

• The time it takes to use up all the reactants

• The rate at which all the reactants are used up

• The time it takes for one of the reactants to be used up

• The increase in concentration of a product per unit time

Tags

NGSS.HS-PS1-5

According to collision theory, particles must collide with ____ and ____ for a reaction to occur.

• sufficient rate and sufficient energy

• sufficient surface area and correct orientation

• sufficient catalyst and sufficient energy

• sufficent energy and correct orientation

What two factors determine 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

More collisions correspond to a:

• faster reaction rate

• slower reaction rate

• unchanged reaction rate

Tags

NGSS.HS-PS1-5

Which of the following is NOT a factor affecting reaction rate?

• temperature
• catalysts
• particle size
• polarity

Tags

NGSS.HS-PS1-5

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

Which of the following would lead to a slower reaction rate?

• Place the reactants in hot water

• Place the products in an ice bath

• Place the reactants in an ice bath

• Stirring the reactants with a stirring rod

Tags

NGSS.HS-PS1-5

Why does a higher temperature increase the rate of a reaction?

• it increases both the frequency and energy of particle collisions
• it only increases the frequency of particle collisions
• it only increases the energy of particle collisions
• it reduces the activation energy of the reaction

Tags

NGSS.HS-PS1-5

Which of the following increases the reaction rate?

• lowering the surface area

• lowering temperature

• adding an inhibitor

• increasing concentration

Tags

NGSS.HS-PS1-5

Grinding a seltzer tablet into powder increases the rate of reaction due to...

• increased concentration of reactants
• increased surface area
• increased speed of particles.
• better orientation of reactants

Tags

NGSS.HS-PS1-5