past_paper Flashcards
Which molecule is not able to form a co-ordinate bond with another species?
B, CH4
Which species has a square planar shape?
C, XeF4
Which bond has the most unsymmetrical electron distribution?
A, H–O
Which statement about inorganic ionic compounds is always correct?
C, They contain metal cations.
Which species has a lone pair of electrons on the central atom?
B, SO2
In which substance do covalent bonds break when it melts?
B, ice
In which molecule are all the atoms in the same plane?
A, CH3CHO
Which molecule has a permanent dipole?
B, NH3
Which substance contains delocalised electrons?
B, graphite
Which species contains bonds that have different polarities?
C, CH3Cl
Which compound has hydrogen bonding?
B, NH3
Which compound contains a co-ordinate bond?
D, NH4Cl
Which molecule has a permanent dipole?
D, Cl2O
Which has a bond angle of 109.5°?
D, NH3
Which substance has delocalised electrons?
A, graphite
Which species is not pyramidal in shape?
D, BF3
Which change occurs when water is vaporised?
C, Intermolecular forces are overcome.
Which compound has the highest boiling point?
D, CH3CH2COOH
Which is not responsible for conduction of electricity?
D, The lone pair electrons on water molecules
Which row shows the bonding in ammonium chloride?
A, ✔, ✘, ✘
Which molecule does not have a permanent dipole?
D, CBr4
Which compound has the highest boiling point?
B, butan-2-ol
Which diagram shows the correct bonding and correct bond polarity in a molecule of oxygen difluoride?
A
Which species has a shape that is influenced by the presence of one or more lone pairs of electrons around the central atom?
B, ClF3
Which is the correct crystal structure for the substance named?
A, Iodine, Simple molecular
Which species has one or more bond angle(s) of 90°?
C, ClF4−
Which is the most likely bond angle around the oxygen atom in ethanol?
A, 104.5°
Which compound has the highest boiling point?
A, CH3CH2CH2OH
Which molecule does not have a permanent dipole?
C, CF4
Which of these species is not planar?
C, CH3OH
Which of these statements best describes a dative covalent bond?
B, A pair of electrons shared between two atoms, where one atom has donated two electrons.
Which molecule is the least polar?
D, Tetrabromomethane
Which statement about intermolecular forces is not correct?
B, Hydrogen bonding occurs between HBr molecules.
Which of these species has a trigonal planar structure?
B, BCl3
Use your understanding of intermolecular forces to predict which of these compounds has the highest boiling point.
A, HF
Which type of bond is formed between N and B when a molecule of NH3 reacts with a molecule of BF3?
C, Co-ordinate.
Which of these atoms has the highest electronegativity?
C, Cl
What is the formula of calcium nitrate(V)?
B, Ca(NO3)2
Which of these substances does not show hydrogen bonding?
D, CHF3
Which of these substances has permanent dipole-dipole attractions between molecules?
C, (CH3)2CO
