RPA Science GCSE Chemistry Temperature Changes RP

What is the purpose of using safety goggles in the experiment?

• To prevent the acid and alkali from tipping over

• To prevent heat from escaping the container

• To protect the eyes from coming into contact with the acid or alkali

• To ensure accurate temperature measurements

Why is a polystyrene cup and lid used in the experiment?

• To prevent the acid and alkali from reacting with the container

• To minimize heat loss from the container

• To provide a stable base for the experiment

• To ensure accurate measurement of the reactants

How much hydrochloric acid is initially poured into the cup?

• 30 centimeters cubed

• 50 centimeters cubed

• 10 centimeters cubed

• 5 centimeters cubed

What is the purpose of recording the starting temperature of the solution?

• To determine the maximum change in temperature

• To calculate the heat energy distributed throughout the solution

• To compare with the final temperature after adding sodium hydroxide

• To ensure accurate measurement of the reactants

How much sodium hydroxide is added in the first step?

• 5 centimeters cubed

• 10 centimeters cubed

• 15 centimeters cubed

• 20 centimeters cubed

What is the maximum temperature reached after adding 10 centimeters cubed of sodium hydroxide?

• 24 degrees Celsius

• 26 degrees Celsius

• 27 degrees Celsius

• 30 degrees Celsius

What is the total quantity of sodium hydroxide added when the temperature starts to level out?

• 20 centimeters cubed

• 25 centimeters cubed

• 30 centimeters cubed

• 35 centimeters cubed

Why does the temperature level out or even drop at times when larger quantities of sodium hydroxide are added?

• Due to the reaction becoming endothermic

• Due to the reaction becoming exothermic

• Due to the presence of a limiting reactant

• Due to heat loss from the container

What type of reaction is this? (choose 2)

• neutralisation

• exothermic

• endothermic

• displacement

Name a controlled variable in this experiment

• the volume of sodium hydroxide

• the volume of hydrochloric acid

• the change in temperature

• the final temperature