PRELIMINARY COURSE ASSESSMENT

CHEMISTRY:

REACTION RATES

PART A

PART B

PART C

BIBLIOGRAPHY

TEAM MEMBERS

GUEST BOOK

ABOUT

PART B

Make a MODEL to show how temperature affects the rate of collisions between particles and therefore the rate of a chemical reaction.

By Yasunari Yahiro

GO TO ANIMATIONS

LEGEND: Which particles represent which?

Reaction Hypothesis:                    CH₃COOH + CaCO₃ ® CaOH₂ + H₂O + CO₂

Ethanoic acid (CH₃COOH) molecule.

Calcium carbonate (CaCO₃) molecule.

Calcium hydroxide (CaOH₂) molecule.

Carbon dioxide (CO₂) molecule.

Water (H₂O)

Products molecule.

Reaction between CaCO₃ molecule and ethanoic acid molecules when heated.

As can be seen when the ethanoic acid is heated, the ethanoic molecules become "excited" and move a lot more. Due to the increase movement, there would be more chances of collisions between other molecules. Also because there are more collisions the rate of the reaction increases.

Reaction between CaCO₃ molecule and ethanoic acid molecules when cold.

Due to the low temperature the molecules inside in the solution are moving very slowly and because of the slow movement the rate of reaction is very slow. This occurs because there are less collisions between the molecules.