Rate of Reaction (Gas) RP Video

What are the two methods demonstrated in the video for measuring the rate of a chemical reaction?

• Using a thermometer and a barometer

• Using a measuring cylinder and a gas syringe

• Using a stopwatch and a scale

• Using a pipette and a burette

What is the concentration of hydrochloric acid used in the first part of the experiment?

• 3 mol per decimeter cubed

• 1 mol per decimeter cubed

• 4 mol per decimeter cubed

• 2 mol per decimeter cubed

Why is it important to read the measuring cylinder at eye level?

• To make sure the cylinder is full

• To avoid parallax error

• To ensure the cylinder is clean

• To prevent the cylinder from tipping over

What is the purpose of clamping the measuring cylinder in place?

• To prevent it from breaking

• To ensure accurate measurement of gas

• To keep it dry

• To make it easier to read

What is the alternative method to using a measuring cylinder for measuring gas production?

• Using a pipette

• Using a barometer

• Using a gas syringe

• Using a thermometer

Why must the gas syringe be kept dry?

• To prevent the gas from dissolving

• To keep the gas pure

• To ensure accurate temperature readings

• To avoid the plunger getting stuck

What is plotted on the x-axis of the graph?

• Concentration of hydrochloric acid

• Time in seconds

• Volume of gas collected

• Amount of magnesium used

Why do the results for 2 molar and 1 molar hydrochloric acid reach the same point?

• Because the reaction is incomplete

• Because the gas syringe is more accurate

• Because an excess of hydrochloric acid is used

• Because the magnesium is the limiting reactant

What is one source of error mentioned in the experiment?

• The gas syringe is too dry

• The hydrochloric acid concentration is too high

• The measuring cylinder is too precise

• Hydrogen may be lost at the start of the reaction

How can the precision of the gas measurement be improved?

• By using an inverted burette

• By increasing the concentration of magnesium

• By using a larger measuring cylinder

• By using a different acid