SS2 CHEMISTRY REVISION 1ST TERM

Which of the following scientists discovered the electrons?

• Joseph J. Thompson

• James Chadwick

• Amedeo Avogadro

• Ernest Rutherford

A coordinate covalent bond could be formed between

• NH₃ and PCl₃

• BCl₃ and AlCl₃

• BCl₃ and NH₃

• H⁺ and AlCl₃

Electrovalent compounds normally

• Have low boiling points

• have mobile electrons

• conduct electricity in the solid state

• dissolve in polar solvents

Consider the following energy profile diagram.

The activation energy of the reaction is

• E_A

• E_B

• E_C

• E_D

Consider the following energy profile diagram.

The enthalpy change of the reaction is

• E_A

• E_B

• E_C

• E_D

The energy profile diagram illustrates

• An endothermic reaction

• an exothermic reaction

• a spontaneous reaction

• a redox reaction

Protons and electrons are called fundamental particles because they

• Are indivisible

• have different charges

• are the lightest particles

• are found in all matter

The region around the nucleus where electrons can be located is called

• a spectra

• an orbital

• a quanta

• a field

The following ions have the same electron configuration except ₈O, ₁₂Mg, ₁₃Al, ₁₇Cl

• Cl^-

• O^2-

• Mg²⁺

• Al³⁺

An element, Q, contains 69% of ⁶³Q and 31% of ⁶⁵Q. What is the relative atomic mass of Q?

• 63

• 63.6

• 65

• 69