Chemistry required practicals

What kind of reaction is displacement? Endo/Exo

Exothermic

What kind of reaction is neutralisation? Endo/Exo

Endothermic

What is the purpose of using a polystyrene cup, rather than a glass, etc.?

Polystyrene reduces heat loss to the surroundings, so the test is more accurate.

What are the potential hazards in investigating temperature change in solutions?

Dilute acids and alkalis - may harm/irritate skin/eyes

What are the potential tests for investigating reactions influenced by concentration?

• ‘Disappearing cross’

• ‘Gas syringe’

What is the basic overview of this experiment?

1. Mix an acid with a metal/substance like magnesium and sodium thiosulfate

2. Swirl the conical flask until mixed

3. Time the reaction speed until the X is no longer visible

What is the basic overview of this experiment?

1. Mix the two substances together (like marble chips and hydrochloric acid)

2. Put the bung onto the flask, and swirl

3. Measure the gas released into the gas syringe