The Nitrogen CycleMr Anderson

OCR B: Agriculture & Industry - The Nitrogen Cycle 2

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Across1 Short chain of linked amino acids. 4 The oxidation state (plus/minus [number]) of nitrogen in NO₂⁻. (2 Words)

5 The oxidation state (plus/minus [number]) of nitrogen in NO₃⁻. (2 Words)

7 Name for the NO₃⁻ anion (omit the brackets).

9 Functional group containing nitrogen (and hydrogen).

11 Name given to the -CONH- bond when between amino acids.

12 The oxidation state (plus/minus [number]) of nitrogen in NH₃. (2 Words)

14 Name for NO. (2 Words) 16 Name for NO₂. (2 Words) 18 Process by which organic nitrogen is converted to ammonium.

21 The name of the -CONH- functional group.

23 Undergone in the formation of ammonium.

24 The oxidation state (plus/minus [number]) of nitrogen in R-NH₂. (2 Words)

25 Macromolecular source of nitrogen.

Down2 Name for N₂O. (2 Words) 3 Process by which atmospheric nitrogen is converted to ammonium.

4 A chain of linked amino acids. 6 Nitrogenous excretory product. 7 Process by which ammonium ions are converted to nitrate ions.

8 The nitrogenous 'currency' of living organisms. (2 Words)

10 The name of the NH₄⁺ cation. 13 Process in which anaerobic bacteria reduce nitrate ions sequentially.

15 Undergone in the formation of nitrates.

17 Name for the NO₂⁻ anion (omit the brackets).

19 The name of the NH₃ molecule. 20 The oxidation state (plus/minus [number]) of nitrogen in N₂O. (2 Words)

22 The oxidation state (plus/minus [number]) of nitrogen in N₂.