Investigating decay (AQA GCSE Biology): Flashcards
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12 cards from this deck
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Practise the cards
12 cards from this deck
What is measured in decay investigation
What is measured in decay investigation
Changes in pH
What causes decay
What causes decay
Bacteria breaking down organic materials
What decay produces
What decay produces
Acids
What lipase is
What lipase is
An enzyme
Why lipase used in practical
Why lipase used in practical
Speeds up decay, makes it quicker to observe
Role of sodium carbonate
Role of sodium carbonate
Makes mixture alkaline at start
Cresol red in alkaline conditions
Cresol red in alkaline conditions
Purple
Cresol red in acidic conditions
Cresol red in acidic conditions
Yellow
Effect of higher temp on decay
Effect of higher temp on decay
Makes decay happen faster
Effect of lower temp on decay
Effect of lower temp on decay
Slows down decay
Why food kept in fridges
Why food kept in fridges
Stops bacteria and enzymes working quickly
How decay rate measured
How decay rate measured
Timing how long for indicator to change colour