OCR A Chemistry A Level Paper 1 Questions
And Answers Verified 100% Correct
Transition element - ANSWER -A d-block element that can form at
least one stable ion with a partially filled d-orbital
have similar physical properties (high densities + mp)
have variable oxidation states cause 4s and 3d orbitals are very close
in energy levels
Cu and Cr are exceptions to rule that 4s subshell is filled before 3d
subshell
Complex ion - ANSWER -a metal ion which is surrounded by
coordinately bonded ligands
Ligand - ANSWER -an atom/ion/molecule that donates a pair of
electrons to a central metal ion
Monodentate ligands - ANSWER -Form one coordinate bond to a
metal ion
e.g. H2O, NH3, Cl-, CN-
Multidentate ligands - ANSWER -Form more than one coordinate bond
each
Bidentate= two
,Octahedral - ANSWER -6 ligands
e.g. [Mn(H2O)6]2+
Tetrahedral - ANSWER -4 ligands
e.g. [CuCL4]2-
Cis-platin - ANSWER -[Pt(NH3)2Cl2]
used in cancer treatment (chemo)
- loses the 2 coordinate cl- ions and coordinating with 2 Nitrogen
atoms in a DNA strand
-prevents dna from replicating and cell is unable to divide
Bronsted-Lowry acid - ANSWER -proton donor
e.g. HCl, H2SO4, H3PO4
Bronsted-Lowry base - ANSWER -proton acceptor
e.g. NaOH, NH3, KOH
Amphoteric - ANSWER -a substance that can act as both an acid and
a base
, acid + metal - ANSWER -acid + metal -> salt + hydrogen
e.g. 2H+ + Mg --> Mg2+ + H2
acid + carbonate - ANSWER -acid + carbonate -> salt + water + carbon
dioxide
e.g. 2H+ + CuCO3 --> Cu2+ + H2O + CO2
acid + base - ANSWER -acid + base -> salt + water
base is solid metal oxide or hydroxide
e.g. 2H+ + MgO --> Mg2+ + H2O
Sorensen's pH scale - ANSWER -pH = -log[H+]
[H+] = 10^(-pH)
- low value of [H+] = high pH value
- high value of [H+] = low pH value
And Answers Verified 100% Correct
Transition element - ANSWER -A d-block element that can form at
least one stable ion with a partially filled d-orbital
have similar physical properties (high densities + mp)
have variable oxidation states cause 4s and 3d orbitals are very close
in energy levels
Cu and Cr are exceptions to rule that 4s subshell is filled before 3d
subshell
Complex ion - ANSWER -a metal ion which is surrounded by
coordinately bonded ligands
Ligand - ANSWER -an atom/ion/molecule that donates a pair of
electrons to a central metal ion
Monodentate ligands - ANSWER -Form one coordinate bond to a
metal ion
e.g. H2O, NH3, Cl-, CN-
Multidentate ligands - ANSWER -Form more than one coordinate bond
each
Bidentate= two
,Octahedral - ANSWER -6 ligands
e.g. [Mn(H2O)6]2+
Tetrahedral - ANSWER -4 ligands
e.g. [CuCL4]2-
Cis-platin - ANSWER -[Pt(NH3)2Cl2]
used in cancer treatment (chemo)
- loses the 2 coordinate cl- ions and coordinating with 2 Nitrogen
atoms in a DNA strand
-prevents dna from replicating and cell is unable to divide
Bronsted-Lowry acid - ANSWER -proton donor
e.g. HCl, H2SO4, H3PO4
Bronsted-Lowry base - ANSWER -proton acceptor
e.g. NaOH, NH3, KOH
Amphoteric - ANSWER -a substance that can act as both an acid and
a base
, acid + metal - ANSWER -acid + metal -> salt + hydrogen
e.g. 2H+ + Mg --> Mg2+ + H2
acid + carbonate - ANSWER -acid + carbonate -> salt + water + carbon
dioxide
e.g. 2H+ + CuCO3 --> Cu2+ + H2O + CO2
acid + base - ANSWER -acid + base -> salt + water
base is solid metal oxide or hydroxide
e.g. 2H+ + MgO --> Mg2+ + H2O
Sorensen's pH scale - ANSWER -pH = -log[H+]
[H+] = 10^(-pH)
- low value of [H+] = high pH value
- high value of [H+] = low pH value
