Podcast
Questions and Answers
What happens when energy is transferred to a substance?
What happens when energy is transferred to a substance?
- The atoms/molecules lose energy and move slower
- The atoms/molecules gain energy and move faster (correct)
- The temperature decreases
- The volume of the substance decreases
What is the relationship between temperature and the speed of atoms/molecules?
What is the relationship between temperature and the speed of atoms/molecules?
- Temperature is inversely proportional to the speed of atoms/molecules
- Temperature is unrelated to the speed of atoms/molecules
- Temperature is a measurement of the average speed of atoms/molecules (correct)
- Temperature measures the mass of atoms/molecules
What happens to the volume of a substance when it is cooled?
What happens to the volume of a substance when it is cooled?
- The volume decreases as the atoms/molecules get closer together (correct)
- The volume remains the same
- The atoms/molecules expand, but the volume remains the same
- The volume increases as the atoms/molecules spread further apart
What happens to the collisions between atoms/molecules when a substance is heated?
What happens to the collisions between atoms/molecules when a substance is heated?
Which of the following statements is true about the atoms/molecules themselves?
Which of the following statements is true about the atoms/molecules themselves?
When a substance is heated, what happens to the collisions between atoms/molecules?
When a substance is heated, what happens to the collisions between atoms/molecules?
What effect does cooling have on the volume of a substance?
What effect does cooling have on the volume of a substance?
How does the speed of atoms/molecules change when a substance is warmed?
How does the speed of atoms/molecules change when a substance is warmed?
What happens to the temperature of a substance when particles are moving slower?
What happens to the temperature of a substance when particles are moving slower?
What does the volume of a substance do when atoms/molecules spread further apart?
What does the volume of a substance do when atoms/molecules spread further apart?
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Study Notes
Heating and Cooling
- Heating a substance means energy is transferred to the substance, resulting in energy gain.
- Cooling a substance means energy is transferred from the substance, resulting in energy loss.
- Energy transfer to/from a substance changes the speed of its atoms/molecules, detected as a temperature change.
Temperature and Atomic Motion
- Temperature is a measurement of the average speed of atoms/molecules.
- Faster atomic motion results in a higher temperature.
- Slower atomic motion results in a lower temperature.
Effects of Heating and Cooling
- When a substance is warmed, atoms/molecules gain energy, move faster, and collide more strongly and frequently.
- As a result, the substance expands, and its volume increases.
- When a substance is cooled, atoms/molecules lose energy, move slower, and collide less strongly and frequently.
- As a result, the substance compresses, and its volume decreases.
Atomic Size and Expansion
- Atoms/molecules themselves do not expand or shrink during heating and cooling.
- Only the arrangement of atoms/molecules changes, affecting the substance's volume.
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