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16 Cards in this Set
- Front
- Back
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What is the equation for density? |
Density = Mass/volume P = m/v |
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What is the unit for density? |
Kg/m³ |
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True or false: An object with a density <1000kg/m³ will float? |
True |
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What is the conservation of energy? |
Energy can neither be created or destroyed. |
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True or false: When substances change state it's mass also changes. |
False - the mass stays the same |
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What is the most energetic state of matter? |
Gas |
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What are the three main states of matter? |
Solid, liquid, gas |
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What is needed in order to change state and why. |
Energy to break bonds |
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What does the flat section of a temperature time graph show? |
It shows when the substance is changing state. |
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By increasing the temperature of a substance this also increases the ________ ______. |
Internal energy |
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What happens when a substance is heated? |
- it's temperature rises and the kinetic energy in particles increases. - if it melts or boils the potential energy of its particles increases. |
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What is the equation for specific latent heat? |
Energy = mass x specific latent heat E = m x L |
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What is latent heat? |
The energy needed for a substance to change state without changing its temperature. |
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What is pressure caused by? |
The random impact of gas molecules on surfaces in contact with the gas. |
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How is the pressure affected when a container is heated? |
- Molecules move faster die to increased energy and hit surfaces with more force - The number of impacts increase so the total force increases. |
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What word is used to describe the movement of gas molecules? |
Random |
