Interpreting Phase Diagrams in Chemistry

What is the defined pressure at sea level on Earth?

• 10 atmospheres

• 0.5 atmospheres

• 1 atmosphere

• 2 atmospheres

What does a phase diagram represent?

• The different states of matter and their transitions according to temperature and pressure

• The electrical conductivity of a substance

• The chemical composition of a substance

• The density of a substance at various temperatures

Tags

NGSS.MS-PS1-4

At what temperature and pressure does water boil at sea level?

• 100 degrees Celsius and 1 atmosphere

• 150 degrees Celsius and 1 atmosphere

• 50 degrees Celsius and 1 atmosphere

• 0 degrees Celsius and 1 atmosphere

How does the boiling point of water change at higher altitudes?

• It decreases

• It increases

• It remains the same

• It fluctuates randomly

What happens to ice on the moon at the right temperature?

• It melts into liquid water

• It remains solid

• It turns into plasma

• It sublimates directly into gas

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NGSS.MS-PS1-4

NGSS.MS-PS3-4

What is the process called when a solid turns directly into a gas?

• Sublimation

• Condensation

• Melting

• Deposition

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NGSS.MS-PS1-4

At what pressure and temperature does carbon dioxide reach its triple point?

• 10 atmospheres and -78 degrees Celsius

• 5 atmospheres and -56 degrees Celsius

• 0.611 kilopascals and 0 degrees Celsius

• 1 atmosphere and 0 degrees Celsius

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NGSS.MS-PS1-4

What is the critical point in a phase diagram?

• The point where a substance boils

• The point where a substance can exist in all three states simultaneously

• The point where a substance becomes a supercritical fluid

• The point where a substance freezes

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What is a supercritical fluid?

• A fluid that cannot dissolve any substances

• A fluid that has properties of both liquid and gas

• A fluid that exists only at high pressures

• A fluid that exists only at low temperatures

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NGSS.MS-PS3-4

How can phase diagrams be used in practical applications?

• To determine the electrical conductivity of a substance

• To understand the behavior of substances under different pressures and temperatures

• To measure the density of a substance

• To calculate the molecular weight of a substance

Tags

NGSS.MS-PS1-4