Required Practicals - Temperature changes

Question 1

What is the goal of the temperature changes practical?

Answer 1

Investigate the variables that affect temperature change in chemical reactions.

Question 2

What is the apparatus list of the temperature changes practical?

Answer 2

-dilute hydrochloric acid
-dilute sodium hydroxide solution
-an expanded polystyrene cup and lid
-250cm3 beaker
-10cm3 measuring cylinder
-50cm3 measuring cylinder
-a thermometer.

Question 3

What is the method for the temperature changes practical?

Answer 3

-Measure 30cm3 dilute hydrochloric acid and put it into the polystyrene cup.
-Stand the cup inside the beaker.
-Use the thermometer to measure the temperature of the acid. Record results in a table.
-Measure 5cm3 sodium hydroxide solution.
-Pour the sodium hydroxide into the polystyrene cup. Fit the lid and gently stir the solution with the thermometer through the hole.
-Look carefully at the temperature rise.
-When the reading on the temperature stops changing, record the highest temperature reached.
-Repeat this to add 5cm3 amounts of sodium hydroxide to the cup each time, recording your temperature reading in the results table until 40cm3 of sodium hydroxide has been added.
-Wash out all the equipment and repeat the experiment for the second trial.

Question 4

What is the reaction used in the practical?

Answer 4

Sodium Hydroxid + Hydrochloric Acid –> Sodium Chloride + Water.

Question 5

What type of reaction is the temperature changes practical?

Answer 5

Exothermic.