States of Matter
21 past-paper questions on States of Matter · examined 2020–2025.
20257 questions
At temperature X, the volume of samples of hexane and pentane are not affected by changing the pressure from 1 atm to 2 atm. At temperature X, the pentane molecules are free to move. At temperature X, the hexane molecules are in fixed positions. What are the states of hexane and pentane at temperature X?
Describe the arrangement and motion of molecules in liquid bromine.
Explain why bromine has a low boiling point. Use ideas about structure and bonding.
Explain why chlorine is a liquid at –50 °C.
Describe the arrangement and motion of chlorine molecules at –50 °C.
Describe the arrangement and motion of molecules in fluorine gas.
Explain why fluorine is a gas at room temperature. Use ideas about structure and bonding.
20241 question
A scientist heats a sample of a liquid. The scientist measures the temperature of the sample and plots a graph of the temperature against time. Which statements are correct? 1 Between points W and X, the temperature increases and the particles move faster. 2 Between points X and Y, there is no change in the temperature because energy is needed to change a liquid into a gas. 3 Between points Y and Z, the particles move further apart.
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