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6. What is the amount, in mol, of NaOH dissolved in 25.0 cm(3^) of an aqueous solution of concentration 0.0125 mol dm (-3^)?
- 3.125 x 10(-4^) mol
- 3.125 x 10(-3^) mol
- 3.125 mol
7. A ....... is a positively charged ion.
8. A redox reaction is a reaction in which.....
- only oxidation takes place
- both reduction and oxidation takes place.
- only reduction takes place.
9. The .......... of a solution is the amount of solute in mol, dissolved per 1 dm(3^) of solution.
- Concentration
- Mass
- Volume
10. An ......... is a negatively charged ion.
11. Which of the following equations is correct? (n=moles, V=volume)
- n=V/24.0
- n=24.0/V
- 24.0=n/V
12. The ........... formula is the simplest whole-number ratio of atoms of each element present in a compound.
- Empirical
- Molecular
- Simple
13. What refers to water molecules that form an essential part of the crystalline structure of a compound?
- Acid of crystallisation
- Water of crystallisation
- Liquid of crystallisation
14. Hydrated refers to a crystalline compound containing ........ molecules.
15. An ........ is a type of base that dissolves in water forming hydroxide ions, OH(-^) (aq) ions.
16. What is the oxidation number combined oxygen?
17. An ................... is a reagent that oxidises (takes electrons from) another species.
- oxidiser
- oxidising agent
- reducing agent
18. Which of these equations is correct? (n=moles, m=mass, M=molar mass)
19. A base is a species that is a proton ....... .
- Neutraliser
- Acceptor
- Donor
20. Which of the following acids is nitric acid?