8841794
Description
Flashcards by Assged Abdalla, updated more than 1 year ago
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Created by Assged Abdalla
almost 7 years ago
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| Question | Answer |
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1.What is density?
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A measure of the mass per unit volume of a substance. |
| 2. What does density measure? |
Density measures how much
matter is packed into a space.
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3. Which is more denser stones
or feathers?
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Stones are more denser than feathers because they have more mass. |
| 4. Which is more denser between liquids and solids of the same material and why? | Solids are more dense because they have closely packed particles. |
| 5. What does density depend on? | Density depends on the amount of volume. |
| 6. What happens to the density of solids and liquids when they're heated? | The substance takes up more space and so it's density increases. |
| 7. What happens to gases when they are heated? | When a gas is heated, its particles spread out even further, lowering its density even more. |
| 8. Why does smoke rise? |
Smoke rises because the air is hot and it
carries soot and burnt material
with it.
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9. Why does a hot air balloon rise?
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The overall density of the hot air balloon is less than the density of the air around it, allowing it to rise into the sky. |
| 10. What is mass? |
Mass measures how much matter is in a substance and is sometimes its weight.
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| 11. What is density measured in? | Density is measured in grams per centimeter cubed : 1 g/cm 3 |
| 12. What units are used to measure mass? | Grams (g), kilograms(kg) and tonnes (t) |
| 13. What does mass depend on? | Mass depends on the amount of of space a substance takes up. |
| 14. What is volume? |
Volume is the amount of space that a substance takes up
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| 15. What is mass measured in? | Mass is measured using a beam balance, electronic balance or scales. |
| 16. What is volume measured in ? | It is measured in milliliters(ml) and liters (L) |
| 17. What happens when a substance is placed in water? | If it is very dense it will sink to the bottom and if it's not very dense it'll float. |
| 18. How does water act above 4 degrees Celsius? | It starts to expand because it's heated. |
| 19. How does ice act below 0 degrees Celsius? | It starts to contract because it has been cooled. |
| 20. How does water act between 0 and 4 degrees Celsius? | It begins to expand when it gets heated and starts to contract when it is cooled. |
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