They expand because the kinetic energy of the particles is increasing, pushing them farther apart and increasing the space between them.
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15
Identify a difference between evaporation and boiling.
Evaporation occurs at all temperatures, and only at the liquid surface, whereas boiling occurs only at the boiling point and throughout the whole liquid.
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thief
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rocket
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rocket
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baam
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10
Which change of state involves a liquid transforming into a gas at the liquid surface?
Evaporation
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20
Which of the pictured materials consists of identical molecules? How do you know?
A and D, because they each contain identical particles consisting of multiple atoms chemically bonded together
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seesaw
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magnet
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shark
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banana
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5
Which state of matter has a fixed volume but no fixed shape?
Liquid
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5
Does the image show a physical change or a chemical reaction?
Chemical reaction
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5
In which state of matter are the particles unable to flow?
Solid
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heart
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shark
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shark
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thief
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5
Are particles moving fastest in the solid state, the liquid state, or the gaseous state?
Gaseous state
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thief
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fairy
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shark
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thief
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25
What is happening at the part of the heating curve labelled '2'? Why?
The substance is melting. The temperature is not increasing because the added heat is being used to break attractive forces between particles.
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15
How does the kinetic energy of particles differ between solids, liquids and gases?
The kinetic energy of particles is highest in gases and lowest in solids.
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15
What causes freezing?
Removing heat decreases the kinetic energy of particles, which allows attractive forces between them to pull them into a rigid structure.
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15
What causes a solid to melt?
Heating the solid increases the kinetic energy of particles until they have enough kinetic energy to overcome some of the attraction between them.
