Investigating Rate of Reaction

What are we trying to find out when investigating rate of reaction?

• The speed of the reaction

• The amount of gas the reaction produce

• The change in color

• The concentration of the solution

What instrument are needed to measure the speed of reaction?

• Stopwatch or clock

• Thermometer

• Gas syringe

Which chemical reaction is the gas syringe useful?

• Chemical reaction that produces gas

• Chemical reaction that changes color

• Chemical reaction that changes temperature

• Chemical reaction that changes concentration

What is the function of gas syringe?

• Collect and measure amount of gas produced

• Collect and measure amount of liquid produced

• Measure the time it takes to become full

A student use gas syringe to investigate rate of reaction for two chemical reactions.

How can he tell which one is faster?

• Find out which one collect more gas in a shorter time

• Find out which one collect the most gas after reaction ended

• Find out the temperature of the chemical when no more gas are collected

Which of the following is the proper practical method when investigating rate of chemical reaction that produces gas?

• Check the amount of gas collected every minute.

• Check the amount of gas collected every hour.

• Check the amount of gas collected after the reaction ended.

A student collects the data of two chemical reactions as shown.

How much gas is produced in experiment 1 after the reaction ended?

(a)  

Which one have a higher rate of reaction?

• Experiment 1

• Experiment 2

• Both have the same rate of reaction

How do we know experiment 1 have higher rate of reaction?

• After 1 min, experiment 1 produce more gas than experiment 2

• After 7 min, experiment 1 produce same amount of gas as experiment 2

• Before it started, experiment 1 and experiment 2 have 0 cm³ of gas.

The graph shows two experiment done in different temperature of chemical.

What does the graph tells us?

• Experiment A have higher rate of reaction

• Experiment B have higher rate of reaction

• Experiment A and B have the same rate of reaction