Landmark flashcards

Question 1

Describe the bonding in magnesium

Answer 1

• strong electrostatic force of attraction between Mg cations and delocalised electrons

Question 2

Explain in terms of structure and boding why magnesium chloride has a high melting point

Answer 2

• MG 2+ and CL - ions are held together by strong electrostatic forces of attraction
• these forces are very strong and require a lot of energy to break so MgCl2 has a high melting point

Question 3

State two features of the current model that are NOT shown in Rutherford’s model

Answer 3

• neutrons and protons in the nucleus
• The current model shows electrons in different orbitals while Rutherford’s model doesn’t.

Question 4

Hydrogen is formed from methane and steam in a reversible reaction. the reaction is endothermic in the forward direction ( due to a positive change in energy) State and explain what happens to the yield of hydrogen when temperature is increased.

Answer 4

• yield of hydrogen will decrease
• because the system will act to oppose the change of increasing the temperature and so will favor the endothermic direction ( as heat energy will be absorbed)