What does le Chatelier's principle state?
When a system in equilibrium is subjected to an external change, the system will readjust itself to minimise the effect of the change.
When a system in equilibrium is subjected to an external change, the system will readjust itself to maximise the effect of the change.
When a system in equilibrium is subjected to an internal change, the system will readjust itself to minimise the effect of the change.
When a system in equilibrium is subjected to an internal change, the system will readjust itself to maximise the effect of the change.
Which of these affect the position of equilibrium?
Changing the temperature.
Changing the pressure.
Adding a catalyst.
Removing product.
Removing reactant.
Changing the concentration
In the Haber process, increasing the ❌ will shift the equilibrium to the ❌, because there are ❌ moles of ammonia than moles of the ❌. However, this is expensive, so it is not economical to keep it high.
Symmetrical molecules are always polar.
Which of the following intermolecular forces occur between molecules of HCl?
London forces
Permanent dipole-dipole interactions
Hydrogen bonds
Place the group 2 elements in order of ascending melting point: Si > > Mg > > > > > Ar
Giant metallic structures have higher melting points than giant covalent structures.
All sub shells in the 3rd shell are filled before the 4s sub shell starts to fill.
The molecule platinum hexafluoride (PtF6) has an octahedral shape.
Iron has the electron formation: 1s2 2s2 2p6 3s2...
...3p6 3d8
...3p6 3d6 4s2
...3p6 3d8 4s2
...3p6 4s8
