Year 10 Science · Unit 2 · Lesson 15
Foundation Worksheet
Learning Goals
Fill the gap
Choose the correct word from the word bank to complete each sentence. Two words will NOT be used.
The Haber process combines gas and hydrogen gas to produce , which is used to make fertilisers. The reaction uses an catalyst and runs at a temperature of . High (about 200 atm) is used because it pushes the equilibrium towards more product. In fermentation, converts into and carbon dioxide.
Match each industrial process to its reaction type and key condition
Draw a line connecting each process on the left to the correct description on the right. Or write the matching letter in the answer column.
| Industrial Process | Your answer | Reaction type & key condition |
|---|---|---|
| Haber process | A. Anaerobic; yeast converts sugar to alcohol at ~35°C | |
| Fermentation (brewing) | B. Enzymatic hydrolysis; breaks lactose into glucose + galactose | |
| Lactase in dairy | C. Reversible synthesis; iron catalyst at ~200 atm, 400–500°C | |
| Amylase in bread baking | D. Saponification; fat + NaOH at elevated temperature | |
| Protease in meat tenderising | E. Enzymatic digestion; breaks starch into sugars for yeast | |
| Lipase in cheese making | F. Enzymatic hydrolysis; breaks peptide bonds in protein |
Note: one option in column A is a distractor and will not be used.
1. The Haber process uses a temperature of 400–500°C even though a lower temperature would produce more ammonia. Explain why this compromise temperature is chosen.
2. Approximately half the nitrogen in a human body passed through the Haber process as ammonia fertiliser. Explain the chain of steps that gets nitrogen from the Haber process into a human body.
Wrap Up
In one sentence, what was the main idea of this lesson?