C6.5 - Collision Theory

What do particles need in order to react?

• They need to collide

• They need to collide with enough energy (activation energy)

• They need to collide with enough energy (activation energy) and be facing the right way (correct orientation)

• They need to collide and be facing the right way (correct orientation)

What is activation energy?

• The minimum amount of energy required by particles to react

• The maximum amount of energy required by particles to react

• The difference in energy between reactants and products

Increasing temperature causes...

• Increased rate of reaction because the particles are moving slower

• Increased rate of reaction because the particles are moving faster

• Decreased rate of reaction because the particles are moving slower

• Decreased rate of reaction because the particles are moving faster

Increasing the concentration of your solutions causes...

• Decreased rate of reaction because there are more particles in the same space, causing more frequent collisions

• Decreased rate of reaction because there are less particles in the same space, causing more frequent collisions

• Increased rate of reaction because there are less particles in the same space, causing more frequent collisions

• Increased rate of reaction because there are more particles in the same space, causing more frequent collisions

Increasing pressure causes....

• Increased rate of reaction because the particles are more spread out

• Increased rate of reaction because the particles are less spread out

• Decreased rate of reaction because the particles are more spread out

• Decreased rate of reaction because the particles are less spread out

Increasing surface area of a solid causes...

• Increased rate of reaction because more particles are exposed to the other reactants

• Increased rate of reaction because less particles are exposed to the other reactants

• Decreased rate of reaction because more particles are exposed to the other reactants

• Decreased rate of reaction because less particles are exposed to the other reactants

Adding a catalyst causes...

• Increased rate of reaction because it is adding another reactant in

• Decreased rate of reaction because an alternative reaction pathway is used, with a lower activation energy

• Increased rate of reaction because an alternative reaction pathway is used, with a lower activation energy

• Increased amount of final product because the rate of reaction is faster

Magnesium and hydrochloric acid are reacted together to form magnesium chloride and hydrogen. The rate of the reaction could be increased by:

• Using a higher concentration of hydrochloric acid

• Using bigger chunks of magnesium

• Decreasing the pressure of the hydrogen gas

• Adding a catalyst