Chemical Reaction Rates

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

Tags

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

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

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

• concentration

• surface area

• temperature

• reactants

What does NOT happen when the temperature is increased?

• Particles collide more often

• Particles collide with more energy

• Particles move faster

• More particles collide in the correct orientation

Tags

NGSS.HS-PS1-5

The ______________is required to break the bonds of the reactants.

• Carbonic energy

• Activation energy

• Plutonic energy

• Energi Gaib

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.

Why don't all collisions between particles cause a reaction?

• the particles also need to collide with a catalyst

• not all the particles collide with enough energy

• not all the particles collide at a high enough temperature

• the particles need to collide with each other twice

Tags

NGSS.HS-PS1-5

The minimum amount of energy needed for colliding particles to react is called

• Chemical Energy

• Kinetic Energy

• Activation Energy

• Potential Energy

Which of these will NOT speed up the rate of reaction between a strip of magnesium and hydrochloric acid?

• tightly coil up the strip of magnesium

• cut up the strip of magnesium

• increase the concentration of the hydrocholoric acid

• increase the temperature of the hydrocholoric acid

Tags

NGSS.HS-PS1-5