Which change of state involves a gas becoming a liquid?
Condensation
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5
Does the image show a physical change or a chemical reaction?
Physical change (change of state)
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20
The image on the left shows ice and the the image in the middle shows liquid water. Based on the image, what is unusual about water compared to most other substances?
In its solid state, water molecules are further apart than in the liquid state. Usually, the opposite is true.
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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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5
In which type of substance are atoms of different elements chemically bonded together?
In compounds
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10
Which phase change involves a solid changing directly into a gas?
Sublimation
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15
For which substance is the heating curve shown? How do you know?
Water, because of its melting point and boiling point
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shark
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15
Is any of these compounds a gas at room temperature? Justify your answer.
Methane is a gas at room temperature, because it boils at a temperature below room temperature.
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15
Do solids expand or contract when heated? Why?
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
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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20
What must be broken for water to undergo a chemical reaction? Refer to the image.
Covalent bonds between oxygen and hydrogen atoms
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15
Based on the image, in which type of chemical reaction are there fewer reactants than products?
