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Phys and chem change
Physical and chemical changes. year 8 yearly
Question | Answer |
---|---|
Can physical changes be reversed? | yes |
Are the chemical bonds broken in a physical reaction? | no |
Give two examples of physical changes. | changes of state and dissolving substances |
What happens when chemical bonds are broken? | the atoms are rearranged. |
Give 5 things that can show a chemical reaction/change. | New substance, solid appears or disappears, temperature changes, colour changes, bubbles appear, light is produced. |
What makes corrosion occur | when metal is deteriorated by water. |
what is galvanizing? | when a layer of zinc is put onto metal to stop corrosion |