Questions Flashcards
1
Q
What is the concentration of Br− if one mole of MgBr2 is dissolved in one litre of water?
A
Find the number of moles of bromide ions in the solution
1 mole of MgBr2 contains 2 moles of Br-
Divide by the volume
Concentration = 2 moles ÷ 1 litre
Remember the conversion between litres and decimetres
1 litre = 1 dm3
Clean up units
Concentration = 2 moldm-3
2
Q
What observations are made during the reaction of metal and acid?
A
Metal dissolves
Fizzing
3
Q
How could a student check to see if all the water has been removed?
A
Heat up till mass is Constant
