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Description
Flashcards by Hamza Ahmed, updated more than 1 year ago
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Created by Hamza Ahmed
over 8 years ago
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| Question | Answer |
| Substance Change | Hamza Ahmed Year 8 |
| What is physical change? | A change of shape or form, expansion and contraction, change of state or mixing substances |
| What are some examples of changing shape or form ? | Breaking, bending, stretching, crushing, twisting or compression |
| What is expansion? | The volume of the object increases but the density decreases |
| What is contraction? | Density of object increases but the density decreases |
| What are the changes of state? | Melting, evaporation, condensation and freezing |
| What is melting? | Change from solid to liquid |
| What is evaporation? | Change from liquid to gas |
| What is condensation? | Change from gas to liquid |
| What is freezing? | Change from liquid to solid |
| What is chemical change? | Chemical change is when a new substance is made |
| How can you identify a chemical change? | Seeing a change in colour, production of gas, seeing a new solid forming in a clear solution or seeing a light or feeling a change in temperature |
| Example of change in colour | Ripening apples |
| Example of gas production | Smell from rotten egg |
| Example of seeing a new solid | Calcium carbonate is formed when CO2 is bubbled through limewater |
| Example of seeing light or change in temperature | Fireworks give off light and temperature |
| What is sublimation? | Change from solid to gas |
| What is deposition? | Change from gas to solid |
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