Year 11 - Science
Alternative methods of extracting metals: phytoextraction and bioleaching
Using Earth's resources
Study Hub
Study Guides
This pupil-friendly study guide includes a unit summary, clear notes, common mistakes, and quick questions with answers.
Unit Summary
This unit covers crude oil, its role as a hydrocarbon source, and separation by fractional distillation. It explores cracking, metal reactivity, and extraction methods, including biological alternatives. Emphasis is on recycling, life-cycle assessments, and evaluating decisions.
Lesson Summary
You will learn to describe how metals are extracted by phytoextraction and bioleaching and compare different methods of metal extraction.
Key Notes
- In phytoextraction, metal is extracted from a crop of plants that absorb metal ions through their roots.
- In bioleaching, metal is extracted from bacteria that extract metal from an ore.
- Electrolysis is a process used to separate metals from their compounds.
- There are advantages and disadvantages associated with each method of extracting metals.
Vocabulary To Learn
- low-grade ore: An ore is a rock that contains metals or metal compounds. A low-grade ore contains a lower percentage of metal or metal compound than a high-grade ore.
- phytoextraction: Phytoextraction is a method of extracting metals by growing plants in soil containing low-grade ore.
- displacement: Displacement is where a more reactive element takes the place of a less reactive element in a compound.
- electrolysis: Electrolysis is a process that uses electricity to break down a compound.
- bioleaching: Bioleaching is a method of extracting metals by growing bacteria on low-grade ores to produce a leachate.
Common Mistakes To Avoid
- Students struggle to distinguish between phytoextraction and bioleaching.
3 Quick Questions (With Answers)
1. Explain the scientific idea in this lesson using two key points.
In phytoextraction, metal is extracted from a crop of plants that absorb metal ions through their roots. In bioleaching, metal is extracted from bacteria that extract metal from an ore.
2. Define this scientific word and use it in context. 'low-grade ore'
An ore is a rock that contains metals or metal compounds. A low-grade ore contains a lower percentage of metal or metal compound than a high-grade ore. Include the word in a full scientific explanation, not as a single label.
3. Correct this common scientific misunderstanding.
Mistake: Students struggle to distinguish between phytoextraction and bioleaching. Correction: Reinforce that the term 'phyto' is a combining form meaning 'plant'.
More Lessons In This Unit
- Alternative methods of extracting metals: phytomining and bioleaching Study Guide
- Cracking fractions of crude oil Study Guide
- Developing a reactivity series for metals Study Guide
- Earth's resources and sustainable development Study Guide
- Extraction of metals by reduction Study Guide
- Fractional distillation of crude oil Study Guide
- Life cycle assessments (LCAs) Study Guide
- Polymer structures Study Guide
- Redox reactions Study Guide
Browse all guides in the Year 11 Science guide library.