This question is about nitrogen (N2\text{N}_2N2) and ammonia (NH3\text{NH}_3NH3).
Nitrogen is a gas at room temperature. It exists as simple molecules.
Draw a dot-and-cross diagram to show the arrangement of the outer-shell electrons in a nitrogen molecule (N2\text{N}_2N2).
Explain why nitrogen has a relatively low boiling point.
The symbols for two isotopes of nitrogen are:
14Nand15N ^{14}\text{N} \quad \text{and} \quad ^{15}\text{N} 14Nand15NState what is meant by the term isotopes.
Complete the table to show the number of protons, neutrons, and electrons in each of these two isotopes of nitrogen.
| 14N^{14}\text{N}14N | 15N^{15}\text{N}15N | |
|---|---|---|
| number of protons | ||
| number of neutrons | ||
| number of electrons |
When nitrogen reacts with hydrogen to form ammonia gas, heat energy is transferred to the surroundings.
State the name given to a reaction in which heat energy is transferred to the surroundings.
Write a chemical equation to represent the reaction that takes place when nitrogen reacts with hydrogen to produce ammonia.
Describe a chemical test to show that the gas produced is ammonia.
Describe a physical test to show that a sample of water is pure.
