What is the latent heat of fusion?

• The energy required to change a substance from liquid to gas at its boiling point.

• The amount of energy required to change a substance from solid to liquid at its melting point without changing its temperature.

• The heat energy released when a substance freezes.

• The energy needed to raise the temperature of a substance by one degree Celsius.

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What is the significance of flat sections on a phase change graph?

• They indicate that the substance is heating up.

• They indicate that the temperature of the substance remains constant while it is undergoing a phase change.

• They show the pressure of the substance is increasing.

• They represent the cooling of the substance.

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What occurs between points B and C on a phase change graph?

• The substance is losing energy and changing from a liquid to a solid (freezing).

• The substance is gaining energy and changing from a solid to a liquid (melting).

• The substance is gaining energy and changing from a liquid to a gas (evaporation).

• The substance is losing energy and changing from a gas to a liquid (condensation).

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What happens to the energy of a substance during a phase change?

• The energy remains constant throughout the phase change.

• The energy of a substance always increases during a phase change.

• The energy of a substance either increases or decreases, depending on whether it is melting, boiling, freezing, or condensing.

• The energy of a substance is only affected during melting and boiling.

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What occurs between points D and E on a phase change graph?

• The substance is gaining energy and changing from a liquid to a gas (vaporization).

• The substance is losing energy and changing from a gas to a liquid (condensation).

• The substance is gaining energy and changing from a solid to a liquid (melting).

• The substance is losing energy and changing from a liquid to a solid (freezing).

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What does it mean when a substance is gaining energy?

• It is losing heat, causing it to freeze.

• It is absorbing heat, which can lead to a phase change from solid to liquid or liquid to gas.

• It is undergoing a chemical reaction that releases energy.

• It is maintaining a constant temperature without any phase change.

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What is melting point?

• The temperature at which a solid becomes a liquid.

• The temperature at which a liquid becomes a gas.

• The temperature at which a gas condenses into a liquid.

• The temperature at which a solid sublimates directly into a gas.

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At what temperature does water freeze?

• -10°C

• 0°C

• 5°C

• -5°C

Why is understanding phase change graphs important?

• It helps in predicting how substances behave under different temperature and pressure conditions, which is essential in various scientific and industrial applications.

• It allows scientists to create new elements and compounds.

• It is only relevant for studying gases and liquids, not solids.

• It simplifies the process of measuring temperature and pressure in experiments.

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What is a phase change graph?

• A visual representation showing the changes in state of a substance as it is heated or cooled, illustrating temperature changes and phase transitions.

• A graph that represents the speed of a chemical reaction over time.

• A chart that displays the different types of chemical bonds in a substance.

• A diagram that outlines the molecular structure of a compound.

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