Chemistry Level 3 (3.4)

Descripción

Demonstrate understanding of thermo-chemical principles and the properties of particles and substances.
Nyasha Makunga
Test por Nyasha Makunga, actualizado hace más de 1 año
Nyasha Makunga
Creado por Nyasha Makunga hace más de 8 años
15
1

Resumen del Recurso

Pregunta 1

Pregunta
A central atom bonded to 6 negative regions with 2 pairs of lone pairs is called...?
Respuesta
  • sea-saw
  • square planar
  • square pyramid

Pregunta 2

Pregunta
Which of these apply to drawing lewis structures?
Respuesta
  • Count total number of valence electrons.
  • Underline the central atom
  • The atom that is the "most electron needy," ( the one which is further right on the periodic table) is placed in the middle.
  • Link other atoms to the central atom using single covalent bond (- =2e).
  • All the atoms must contain 8 electrons except Be=4 , B=6 and H=2
  • If an atom has insufficient electrons, take a lone pair from a neighbour and create multiple bonds between them.

Pregunta 3

Pregunta
Which of these have a polar bond.
Respuesta
  • H-H
  • H-F

Pregunta 4

Pregunta
What makes a molecule polar?
Respuesta
  • Same atoms bonded together
  • Different atoms bonded together
  • 3D symmetrical molecule
  • 3D asymmetrical molecule

Pregunta 5

Pregunta
The shape of the PCl3 molecule is trigonal pyramid.
Respuesta
  • True
  • False
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