AS Chemistry

Who is your chemistry teacher?

• Dmitri Mendeleev

• John Dalton

• Jacky Wang

• Alfred Bernhard Nobel

0.2 mol of a hydrocarbon undergo complete combustion to give 35.2 g of carbon dioxide and 14.4 g of water as the only products. What is the molecular formula of the hydrocarbon?

• C₂H₄

• C₂H₆

• C₄H₄

• C₄H₈

[Rn] 5f¹⁴6d¹⁰7s²7p⁶

In which Group of the Periodic Table would you expect to find this element?

• 2

• 14

• 16

• 0

The diagram shows the first ionisation energies of 11 consecutive elements.

Which type of elements are labelled X and Y ？

• Group I metals

• Group ll metals

• halogens

• noble gases

In which pair do both atoms have one electron only in an s orbital in their ground

states?

• Ca, Sc

• Cu, Be

• H, He

• Li, Cr

Which molecule contains only six bonding electrons?

• C₂H₄

• C₂F₆

• H₂O

• NF₃