Chemistry 101 Flashcards
Tests for the presence of water
-Anhydrous Copper (II) sulfate (White to Blue)
-Cobalt Chloride paper (Blue to Pink)
How to check for Copper Ions
Add sodium hydroxide to a solution thought to be ‘containing copper ions’ if copper ions are present a blue precipitate should be formed
What is a fuel cell reaction?
A fuel cell is an electrochemical device that can continuously convert the energy from a chemical reaction and an oxidant fuel to electrical energy by a process involving an electrode-electrolyte system.
What is electrolysis?
electrolysis, a process by which electric current is passed through a molten or aqueous ionic substance to effect a chemical change.
Define Equilibrium
Chemical equilibrium is the state where the forward reaction is equal to that of the backward reaction, this also takes place in a closed system thus the concentration of products and reactants are the same
What gas relights a glowing splint?
Oxygen
Test for Hydrogen
If hydrogen is present in a test tube, a lighted splint held near its mouth ignites with a squeaky pop.
Chemical Properties of Transition Metals
Forms colored compounds and acts as a catalyst
Physical Properties of transition elements
They have high densities and high melting a boiling points
Colour of Copper (II) carbonate
Green
Colour of Copper (II) oxide
Black
Check for nitrate ions
Add sodium hydroxide to a solution with nitrate ions, then add aluminum powder, warm and the ammonia gas should be given off this would turn damp red litmus paper blue
Check for Iron (II) ions
Add sodium hydroxide to a solution containing Iron (II) ions if a green precipitate is formed then an Iron (II) ion is present furthermore if left alone there green precipitate should turn to an orange-brown one
Check for Iron (III) ions
Add sodium hydroxide to a solution containing Iron (III) ions if an orange-brown precipitate is formed then an Iron (III) ion is present
