Rate of Reaction (Colour) RP Video Quiz

What is the main objective of the experiment described in the video?

• To observe the color change in a reaction

• To measure the temperature change during a reaction

• To measure the rate of a chemical reaction

• To determine the pH of a solution

What is produced when sodium thiosulfate reacts with hydrochloric acid?

• A clear solution

• A gas

• An insoluble precipitate of sulfur

• A soluble salt

How much sodium thiosulfate is initially measured out for the reaction?

• 40 cm³

• 60 cm³

• 10 cm³

• 50 cm³

What is the concentration of the most concentrated sodium thiosulfate solution used in the experiment?

• 50 grams per decimeter cubed

• 40 grams per decimeter cubed

• 30 grams per decimeter cubed

• 20 grams per decimeter cubed

What is the purpose of varying the concentration of sodium thiosulfate in the experiment?

• To increase the volume of the solution

• To observe the effect on the rate of reaction

• To produce more sulfur

• To change the color of the solution

How is the concentration of sodium thiosulfate varied in the experiment?

• By adding a catalyst

• By heating the solution

• By adding more hydrochloric acid

• By diluting with distilled water

What is the expected effect on the rate of reaction when the concentration of sodium thiosulfate is decreased?

• The rate of reaction remains the same

• The solution becomes clearer

• The rate of reaction decreases

• The rate of reaction increases

Why is it important to keep the total volume of the solution constant at 50 cm³?

• To make the solution more concentrated

• To change the color of the solution

• To ensure accurate measurement of reaction time

• To increase the amount of sulfur produced

What safety precaution is mentioned regarding the sulfur dioxide fumes?

• Wear gloves

• Avoid breathing in the fumes

• Wear safety goggles

• Use a fume hood

What does the graph of concentration of sodium thiosulfate against reaction time typically look like?

• A zigzag line

• A straight line

• A horizontal line

• A curve