Exothermic transfer...
Transfer from reacting molecules to surrounding
2 examples of exothermic reaction
Neutralisation and combustion reactions
Exothermic the surroundings get hotter/colder
hotter
2 uses of exothermic
Hand warmers and self heating cans
Endothermic transfer...
Takes in energy from surrounding
Endothermic the surroundings get hotter/colder
colder
Temp change practical
Pour dilute acid into a polystyrene cup which is standing in a beaker (to stop falling over). Use a thermometer to measure temperature and record it. Add 5cm cubed of sodium hydroxide solution into the polystyrene cub. Fit a plastic lid on the cup and make a hole for the thermometer. Gently swirl. Record highest temperate reach. then repeat with higher sodium hydroxide