Chemistry modules 2 and 3

Question 1

Question

What does le Chatelier's principle state?

Answer

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.

Question 2

Question

Which of these affect the position of equilibrium?

Answer

Changing the temperature.
Changing the pressure.
Adding a catalyst.
Removing product.
Removing reactant.
Changing the concentration

Question 3

Question

In the Haber process, increasing the [blank_start]pressure[blank_end] will shift the equilibrium to the [blank_start]right[blank_end], because there are [blank_start]fewer[blank_end] moles of ammonia than moles of the [blank_start]reactants[blank_end]. However, this is expensive, so it is not economical to keep it high.

Answer

pressure
temperature
right
left
fewer
more
reactants
products

Question 4

Question

Symmetrical molecules are always polar.

Answer

True
False

Question 5

Question

Which of the following intermolecular forces occur between molecules of HCl?

Answer

London forces
Permanent dipole-dipole interactions
Hydrogen bonds

Question 6

Question

Place the group 2 elements in order of ascending melting point: Si > [blank_start]Al[blank_end] > Mg > [blank_start]Na[blank_end] > [blank_start]S[blank_end] > [blank_start]P[blank_end] > [blank_start]Cl[blank_end] > Ar

Answer

Question 7

Question

Giant metallic structures have higher melting points than giant covalent structures.

Answer

True
False

Question 8

Question

All sub shells in the 3rd shell are filled before the 4s sub shell starts to fill.

Answer

True
False

Question 9

Question

The molecule platinum hexafluoride (PtF6) has an octahedral shape.

Answer

True
False

Question 10

Question

Iron has the electron formation: 1s2 2s2 2p6 3s2...

Answer

...3p6 3d8
...3p6 3d6 4s2
...3p6 3d8 4s2
...3p6 4s8

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Chemistry modules 2 and 3

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Resource summary

Question 1

Question 2

Question 3

Question 4

Question 5

Question 6

Question 7

Question 8

Question 9

Question 10

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	Created by Neil Patil over 8 years ago