General Questions-module 2 Flashcards
1
Q
Why is Na3PO4 described as a salt of H3PO4?
A
The H+ ions have been replaced by Na+ ions
2
Q
Why does PH3 have a lower boiling point than NH3?
A
Because NH3 has hydrogen bonds which are harder to break, PH3 is just permenant dipole
3
Q
Describe the trend in reactivity of group 2 elements as the group is descended
A
Atomic radius increases down the group Elements become more reactive More shielding Outermost electrons experience less attraction to the nucleus Ionisation energy decreases
4
Q
What reagent is added to calcium iodide to show the solution contained iodide ions and what observation would you make?
A
Silver nitrate
Forms a yellow precipitate
5
Q
Explain the trend across period 2
A
Atomic radius decreases
All atoms experience the same shielding
Electrons are more strongly attracts to the nucleus
Number of protons increases
6
Q
Explain the meaning of m and z in a mass spectrometer
A
M - relative isotopic mass
Z - charge
