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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.

A hydrophilic compound will usually dissolve into an aqueous solvent. True or false?

Which of the following statements about orbital hybridisation is incorrect?  

Match the protein form to the correct structural type.

Which one of the following compounds is an alkene?  

What does valance shell electron pair repulsion (VSEPR) theory tell us about a molecule?