Q. In which state of matter do particles have the strongest intermolecular forces? (2023)
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A.
Gas
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B.
Liquid
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C.
Solid
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D.
Plasma
Solution
In solids, particles are held together by strong intermolecular forces, giving them a definite shape and volume.
Correct Answer: C — Solid
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Q. What is the effect of increasing temperature on the kinetic energy of particles in a solid? (2023)
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A.
Decreases kinetic energy
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B.
Increases kinetic energy
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C.
No effect
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D.
Causes phase change
Solution
Increasing temperature increases the kinetic energy of particles, leading to potential phase change.
Correct Answer: B — Increases kinetic energy
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Q. What is the process called when a gas turns into a liquid? (2022)
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A.
Sublimation
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B.
Condensation
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C.
Evaporation
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D.
Freezing
Solution
Condensation is the process where a gas turns into a liquid.
Correct Answer: B — Condensation
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Q. What is the term for the change of state from solid directly to gas? (2020)
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A.
Sublimation
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B.
Deposition
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C.
Evaporation
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D.
Condensation
Solution
Sublimation is the process where a solid changes directly into a gas without passing through the liquid state.
Correct Answer: A — Sublimation
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Q. What is the term for the change of state from solid to gas without passing through the liquid state? (2020)
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A.
Sublimation
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B.
Deposition
-
C.
Evaporation
-
D.
Condensation
Solution
Sublimation is the process where a solid changes directly into a gas without becoming a liquid.
Correct Answer: A — Sublimation
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Q. Which of the following best describes the behavior of gases according to the kinetic molecular theory? (2019)
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A.
Particles are tightly packed
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B.
Particles are in fixed positions
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C.
Particles are in constant random motion
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D.
Particles have strong intermolecular forces
Solution
According to the kinetic molecular theory, gas particles are in constant random motion.
Correct Answer: C — Particles are in constant random motion
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Q. Which of the following describes the arrangement of particles in a gas? (2023)
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A.
Tightly packed in a fixed position
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B.
Close together but can move past each other
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C.
Far apart and moving freely
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D.
Arranged in a regular pattern
Solution
In gases, particles are far apart and move freely, allowing them to fill the container they are in.
Correct Answer: C — Far apart and moving freely
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Q. Which of the following is an example of sublimation? (2022)
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A.
Ice melting
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B.
Dry ice turning into gas
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C.
Water boiling
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D.
Salt dissolving in water
Solution
Sublimation is the process where a solid turns directly into a gas, as seen with dry ice (solid CO2).
Correct Answer: B — Dry ice turning into gas
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Q. Which of the following states of matter has the weakest intermolecular forces? (2023)
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A.
Solid
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B.
Liquid
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C.
Gas
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D.
Plasma
Solution
Gases have the weakest intermolecular forces, allowing particles to move freely.
Correct Answer: C — Gas
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Q. Which phase change occurs at the boiling point of a substance? (2022)
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A.
Melting
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B.
Sublimation
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C.
Condensation
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D.
Vaporization
Solution
Vaporization occurs at the boiling point when a liquid turns into gas.
Correct Answer: D — Vaporization
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Q. Which state of matter has the highest density under normal conditions? (2023)
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A.
Gas
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B.
Liquid
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C.
Solid
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D.
Plasma
Solution
Solids generally have the highest density due to closely packed particles.
Correct Answer: C — Solid
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