Expert Chemistry Tutoring

Q1: Knowledge Recall (2 marks)

Define the term "electron configuration."

Q2: Knowledge Recall (1 mark)

State the electronic configuration of a helium atom.

Q3: Application (3 marks)

Explain why sodium is more reactive than potassium.

Q4: Application (2 marks)

Predict the type of bonding formed between sodium and chlorine. Explain your answer.

Q5: Calculation (4 marks)

Calculate the number of electrons in an atom of oxygen with an atomic number of 8.

Q6: Knowledge Recall (2 marks)

What is the electronic configuration of the noble gas neon?

Q7: Application (3 marks)

Describe the difference between a metal and a non-metal based on their electronic structure.

Q8: Calculation (3 marks)

Calculate the molar mass of sodium chloride (NaCl) given the following relative atomic masses: Na = 23.0, Cl = 35.5.

Q9: Application (2 marks)

Explain why the melting point of sodium chloride is higher than that of water.

Q10: Chemical Equation (4 marks)

Write a balanced chemical equation for the reaction between sodium and chlorine.