More collisions correspond to a: 

• Faster reaction rate  
• Slower reaction rate
• Constant reaction rate 
• None of the above

Tags

NGSS.HS-PS1-5

Which of the following increase the reaction rate?

• less surface area
• lower temperature
• an inhibitor
• increased concentration

Tags

NGSS.HS-PS1-5

Crushing a solid into a powder will increase reaction rate because:

(a)  

• the powdered form has more surface area
• the particles will collide with more energy
• the orientation of colliding particles will be improved
• the activation energy barrier will be lowered

Tags

NGSS.HS-PS1-5

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

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

• twist the strip of magnesium
• grind up the strip of magnesium
• increase the concentration of the hydrocholoric acid
• increase the temperature of the hydrocholoric acid

Tags

NGSS.HS-PS1-5

2SO_2(g)+O_2(g) ⇌ 2SO_3(g) + Heat

Adding SO_2(g) will

• shift equilibrium right

• shift equilibrium left

• increase rate of reaction

• have no change

Tags

NGSS.HS-PS1-5

2SO₂(g)+O₂(g) ⇌ 2SO₃(g) + Heat

Increasing the temperature will...

• shift equilibrium right

• shift equilibrium left

• increase pressure

• have no change

Tags

NGSS.HS-PS1-5

2SO_2(g) + O_2(g) ⇌ 2SO_3(g) + Heat

Removing O_2(g) will

• shift equilibrium right

• shift equilibrium left

• increase pressure

• have no change

2SO₂(g)+1O₂(g) ⇌ 2SO₃(g) + Heat

Increasing the pressure on the system will...

• shift equilibrium right

• shift equilibrium left

• slow rate of reaction

• have no change

At what time (in seconds) is equilibrium established?

• 0 seconds

• 1 second

• 5 seconds

• 10 seconds