Rates of Reaction

Rate of reaction- How fast something happens in a certain amount of time

Why does a reaction slow down as time goes on?

The amount of reactants decreases which means there is a lower frequency of collisions between particles so the reaction slows down

What is the equation for rate?

Change in concentration / Time

• CaCO+HCl in a reaction, HCl starts with 2mol dm^-3, it decreases to 1.5 mol dm^-3 in 3 minutes what is the rate of reaction?
• 2-1.5=0.5   0.5/3=0.167 mol dm^-3/min (3dp)

How can we measure the rate of reaction?

The mass of reactants used up or the mass of products formed

• Reactions take place when particles collide with a…