experiments Flashcards
(8 cards)
What is the setup for the experiment to show the percentage of oxygen in the air?
Copper is put in a large tube attached to two gas syringes.
What do the gas syringes contain?
One syringe contains 100 cm³ of air, and the other syringe is empty.
What happens to the copper during the experiment?
Copper is heated strongly.
How is air passed over the copper?
Air is passed over copper using the syringes.
What reaction occurs between oxygen and copper?
Oxygen reacts with copper.
What is the result of the reaction in terms of air volume?
The volume of air decreases to 80 cm³.
how to do crystallisation
react
filter
evaporate (heat to evaporate some water)
cool(collect crystals that form)
dry(allow to dry in warm place or on filter paper)
test for hydrogen
hold a lighted splint over the gas
if there’s a squeaky pop
hydrogen is present
