2021 Chemistry Paper 1 Flashcards
1
Q
What is electronegativity?
A
The ability of an atom to attract the bonding electrons in a covalent bond towards itself.
2
Q
What is a bidentate ligand?
A
A molecule or ion which donates two pairs of electrons to form two coordinate bonds to a central metal ion.
3
Q
What is a suitable indicator in a titration with I⁻/I₂?
A
Starch
4
Q
What colour change is seen by starch when used as an indicator?
A
I₂ present: blue-black
I₂ not present: colourless
5
Q
What feature of fuel cells differentiates them from conventional storage cells?
A
In a fuel cell, fuel reacts with oxygen to give electrical energy.
6
Q
State two features of a dynamic equilibrium.
A
- closed system
- rate of forwards reaction = rate of backwards reaction
