Chemistry Year 12 Random Retrieval

Which of these alcohols is oxidised to a ketone by a hot acidic solution of potassium dichromate(VI)?

(i) (CH₃)₃COH

(ii) CH₃CH₂CHOHCH₃

(iii) CH₃CH₂CH₂CH₂OH

(iv) CH₃C(CH₃)₂CH₂CHOHCH₃

Which of these true statements help to explain why the values of the first ionisation enthalpies (energies) of the group 1 metals fall down the group from lithium to caesium?

(i) Down the group, the outer electron gets further from the nucleus

(ii) The charge on the nucleus increases down the group

(iii) Greater shielding means that the attraction between the nucleus and the outer electron reduces down the group

(iv) In all the atoms the outer electron is an s-electron

What is the oxidation number of NITROGEN in

NH₃

The isotopes of an element have the same:

(i) relative atomic mass

(ii) atomic number

(iii) mass number

(iv) electron configuration.

What is the electronic configuration of bromine? Enter your answer in the following format 1s2 2s2 etc. (note the space between each sub-shell!) Follow the aufbau order of sub-shell filling.

What is the mass of 0.00400 mol of sodium hydrogensulfate?

Which of these compounds consist of molecules which are linear?

(i) water

(ii) beryllium chloride

(iii) sulfur dioxide

(iv) carbon dioxide

What is the bond angle found in BeCl₂?

In which of these molecules do the intermolecular forces arise largely from hydrogen bonding?

In the family of hydrocarbons called alkanes:

(i) the boiling points of the straight chain compounds rise as the number of carbon atoms increases

(ii) the intermolecular forces arise from attractions between temporary dipoles

(iii) in any pair of isomers the compound with the more highly branched molecules has the lower boiling point

(iv) the unbranched compounds are all liquids at room temperature.