What is the difference between a chemical and physical change?
A chemical change results from a chemical reaction, while a physical change is when matter changes forms but not chemical identity. Examples of chemical changes are burning, cooking, rusting, and rotting. Examples of physical changes are boiling, melting, freezing, and shredding.
What is galvanising?
Galvanization or galvanizing is the process of applying a protective zinc coating to steel or iron, to prevent rusting.
- What was the most dramatic change you observed?
- Chemical reactions are associated with energy changes, which are detected by heat loss or gain. What evidence is there of energy changes in Tests 3 and 4?
- Can we reverse chemical changes?