june 2020- paper 3 Flashcards
1
Q
2 reasons it is good to reduce NOx gas emissions
A
- they can cause acid rain
- they can cause respiratory problems
2
Q
phosphorus (V) oxide + water
A
P4O10 + 6H2O > 4H3PO4
3
Q
why do transition metals form coloured compounds (3)
A
- some wavelengths are absorbed
- excites electrons in the d orbital
- remaining wavelengths get transmitted
4
Q
substances and conditions in a standard hydrogen electrode
A
Pt electrode, 298K, 100kPa, H2 (g), 1moldm3 H+ ions
5
Q
what decolourises acidified potassium manganate (VII) solution?
A
FeSO4
