Rate of Which a Chemical Reaction Occurs

Assessment Task 1 –

Rate of which a Chemical Reaction Occurs

Chemical reactions occur at different rates. In this experiment I will consider the key factors temperature that influences the rate of a reaction. Other factors include:

- nature of reactants - particle size

- concentration

- catalysts

According to the collision theory, the rate of a reaction depends on the frequency of collisions between reacting particles. The more frequent the collisions, the faster the rate of the reaction. However, in order for the collisions to be effective, the particles must collide with sufficient energy. The factor that I will be examining in this lab influence reaction rate by either increasing how often collisions occur or by making collisions more effective.

Purpose: To examine the effect of temperature on the rate at which a chemical reaction occurs.

Materials Needed:

- 3 Alka Seltzer tablets

- 3 250-mL beakers

- water at three temperatures – with

- ice, room temperature, warm (around 70°C)

Procedure:

1. Half fill three 250-mL beaker with water. In one beaker add several ice cubes. A second beaker will contain water at room temperature. In the third beaker add water that has been heated to about 70°C.

2. Record the water temperature in the three beakers, and then add an Alka Seltzer tablet to each.

3. Record the time it takes for the Alka Seltzer tablet to completely dissolve

Hypothesis: