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Two atomic orbitals will overlap to form how many molecular orbitals?  

What is the pH of a 0.65 M solution of formic acid (Ka = 1.77 x 10-4)? Give your answer to 2 d.p.

Which one of the following is a non-polar bond?   

What type of intermolecular force is being shown in the this interaction?  

Which one of the following statements regarding a dynamic equilibrium is True?

Questions 41 – 43 relate to the following problem: You have a solution of 0.5 mol dm-3 sodium hydroxide. Titration of 125.0 cm3 of this solution required 30 cm3 of a hydrochloric acid solution for complete neutralisation.                                      What is the concentration of the hydrochloric acid in mol/dm3 (molarity)?

What mass of NaOH do we need to prepare 250 mL of a 3.5 M solution? (Molar mass of NaOH = 40 g/mol)

Which one of the following statements about bonding is False?

Questions 41 – 43 relate to the following problem: You have a solution of 0.5 mol dm-3 sodium hydroxide. Titration of 125.0 cm3 of this solution required 30 cm3 of a hydrochloric acid solution for complete neutralisation.                                                                                            How many moles of sodium hydroxide were neutralised?

Fill in the blanks: A buffer is a solution containing a [weak] acid and its [conjugate] base, which can resist a change in [pH] when small amounts of H+ or OH- ions are added.