Enthalpy change of neutralisation:

What is the purpose of using a polystyrene cup with a lid in the experiment?

• To increase heat loss through the sides and the bottom

• To reduce heat loss through the sides and the bottom

• To increase heat loss to the air

• To reduce heat loss to the air

What is the independent variable in this practical?

• The volume of hydrochloric acid

• The volume of sodium hydroxide solution

• The concentration of hydrochloric acid

• The concentration of sodium hydroxide solution

What is the dependent variable in this practical?

• The volume of hydrochloric acid

• The volume of sodium hydroxide solution

• The concentration of hydrochloric acid

• The maximum temperature reached

What are the control variables in this practical?

• The volume of hydrochloric acid and the concentration of hydrochloric acid

• The volume of sodium hydroxide solution and the concentration of sodium hydroxide solution

• The volume of hydrochloric acid and the volume of sodium hydroxide solution

• The concentration of hydrochloric acid and the concentration of sodium hydroxide solution

What happens to the maximum temperature reached as the volume of sodium hydroxide solution increases?

• It decreases

• It remains constant

• It increases

• It fluctuates

Why does the maximum temperature decrease after a certain volume of sodium hydroxide solution?

• There is not enough hydrochloric acid for the reaction to occur

• The sodium hydroxide solution becomes too concentrated

• The energy released is spread out into a greater volume

• The reaction becomes endothermic

What type of reaction is the neutralization reaction between hydrochloric acid and sodium hydroxide?

• Exothermic

• Endothermic

• Neutral

• Irreversible

What is the purpose of adding a plastic lid to the polystyrene cup?

• To prevent the reaction from occurring

• To allow heat loss to the air

• To prevent heat loss to the air

• To increase the volume of the solution

What is the reason for using a thermometer to gently stir the solution?

• To increase the reaction rate

• To ensure the reaction is complete

• To evenly distribute the heat

• To measure the temperature accurately

What is the purpose of measuring the maximum temperature reached in the experiment?

• To determine the volume of sodium hydroxide solution

• To calculate the concentration of hydrochloric acid

• To investigate the effect of temperature on the reaction rate

• To analyze the energy released by the reaction