4. PRO Chemical Changes
Consider the following questions that might be posed in a chemistry context:
Why does fizzing occur when vinegar is added to baking soda?
Why does a hand warmer heat up when activated?
Why does a precipitate form when lead nitrate and potassium iodide are mixed?
Why does iron rust when exposed to water and oxygen?
Why does a magnesium strip burn with a bright white flame?
Why does methane need a spark or flame to start burning?
Why does copper carbonate break down when it is heated?
How do plants make glucose?
Why does magnesium fizz in hydrochloric acid?
Why does copper develop a green coating outdoors?
Why does a white solid form when silver nitrate and sodium chloride are mixed?
Why does ethanol undergo combustion?
Why does a bright white flame occur when magnesium burns?
For each question, write a complete PRO explanation using the structure below.
Ensure:
The Premise (P): states a general scientific principle or condition.
The Reasoning (R): explains the mechanism linking cause to effect.
The Outcome (O): states the observable result.
Choose from the PRO starters below to structure the explanations.
Premise (P) Starters
Reasoning (R) Starters
Outcome (O) Starters