States of Matter
Each subtopic includes About section, revision page link, 10 preview questions, and practice CTAs.
Kinetic particle theory
SubtopicKinetic particle theory under States of Matter for Grade 12 IGCSE.
Preview questions (no answers)
- 1.
When a gas is cooled, its particles lose energy. What is the eventual result of this cooling?
A.The particles move further apart
B.The particles move closer together and may eventually condense
C.The particles increase in speed
D.The particles disappear
- 2.
Which of the following is not a property of a gas?
A.It can flow
B.It has a high density
C.It is easily compressed
D.It fills its container
- 3.
Which observation provides direct evidence that matter is made of moving particles?
A.Ice is cold to the touch
B.A liquid has a fixed volume
C.Diffusion of a colored gas
D.A solid has a regular shape
- 4.
What is the effect of increasing the surface area of a liquid on its rate of evaporation?
A.Rate of evaporation decreases
B.Rate of evaporation stays the same
C.Rate of evaporation increases
D.Evaporation stops
- 5.
Two gases, () and (unknown ), are introduced at opposite ends of a horizontal glass tube at the same time. The gases diffuse and react to form a solid deposit at the position shown in the diagram. Based on the kinetic particle theory, what is the relative molecular mass () of gas ?
A.4
B.32
C.64
D.128
- 6.
Which of the following pairs of variables are inversely proportional for a fixed mass of gas at a constant temperature?
A.Pressure and Temperature
B.Volume and Temperature
C.Pressure and Volume
D.Density and Temperature
- 7.
How does increasing the surface area of a liquid affect its rate of evaporation?
A.It decreases the rate because there is more room for condensation.
B.It increases the rate because more particles are near the surface and can escape.
C.It has no effect on the rate of evaporation.
D.It increases the boiling point of the liquid.
- 8.
A substance is in the gas phase. If the temperature is lowered below its boiling point at constant pressure, what kinetic change occurs during the phase transition?
A.The particles stop moving entirely.
B.The particles lose kinetic energy and gain potential energy.
C.The particles lose potential energy while kinetic energy remains constant.
D.The particles gain kinetic energy from the surroundings.
- 9.
An ideal gas is contained in a piston. If the temperature is held constant and the volume is increased, what happens to the collision frequency per unit area of the wall?
A.It increases.
B.It decreases.
C.It remains the same.
D.It becomes zero.
- 10.
In which state of matter are the particles arranged in a regular repeating pattern, but still possess vibrational kinetic energy?
A.Solid only
B.Liquid only
C.Gas only
D.Solid and Liquid
Download the worksheet for States of Matter - Kinetic particle theory to practice offline. It includes additional chapter-level practice questions.
Preview questions (no answers)
- 1.
If gas A has a molecular mass of 32 and gas B has a molecular mass of 16, which statement is true?
A.Gas A diffuses twice as fast as Gas B.
B.Gas B diffuses faster than Gas A.
C.Gas A and Gas B diffuse at the same rate.
D.Gas B cannot diffuse because it is too light.
- 2.
Which of these is an example of diffusion in everyday life?
A.Water boiling in a kettle
B.Sugar dissolving and spreading in a cup of tea without stirring
C.Ice melting in a drink
D.A balloon popping
- 3.
What type of motion is primarily responsible for diffusion in gases?
A.Vibrational motion
B.Translational (random) motion
C.Rotational motion in a fixed spot
D.No motion at all
- 4.
In which medium will a gas diffuse the fastest?
A.In a vacuum
B.In air
C.In water
D.In oil
- 5.
Which statement correctly compares the rate of diffusion of Carbon Monoxide () and Carbon Dioxide ()?
A.diffuses faster because it has a lower molar mass.
B.diffuses faster because it is a larger molecule.
C.They diffuse at the same rate because they both contain carbon.
D.diffuses slower because it is toxic.
- 6.
Why does a higher concentration gradient lead to a faster net rate of diffusion?
A.The particles move faster at higher concentrations.
B.There are more collisions between particles at lower concentrations.
C.There is a higher probability of particles moving from the region of more particles to the region of fewer particles.
D.Concentration gradient affects the mass of the particles.
- 7.
A mixture of Hydrogen () and Deuterium () is allowed to diffuse through a porous barrier. Which gas will be more concentrated on the other side of the barrier initially?
A.Hydrogen, because it has a lower molar mass.
B.Deuterium, because it is more stable.
C.They will be equally concentrated because they are isotopes.
D.The concentrations will depend on the temperature only.
- 8.
Two gases, and , have molar masses in the ratio . If of diffuses in , how much time will it take for of to diffuse under the same conditions?
A.B.C.D. - 9.
A sample of gas has a rate of diffusion that of . What is the of ?
A.B.C.D. - 10.
If gas A diffuses through a hole at and gas B diffuses at , what is the ratio of their molar masses ?
A.B.C.D.
Download the worksheet for States of Matter - Diffusion to practice offline. It includes additional chapter-level practice questions.
Changes of state
SubtopicChanges of state under States of Matter for Grade 12 IGCSE.
Preview questions (no answers)
- 1.
Which of the following defines the 'Boiling Point' of a liquid?
A.The temperature at which it starts to evaporate
B.The temperature at which its vapor pressure equals atmospheric pressure
C.The temperature at which it turns into a solid
D.The temperature at which its particles stop moving
- 2.
Which state of matter has the strongest attractive forces between its particles?
A.Liquid
B.Gas
C.Solid
D.Vapor
- 3.
What happens to the motion of particles in a solid as it is cooled?
A.They vibrate faster
B.They vibrate more slowly
C.They start to slide past each other
D.They stop moving immediately
- 4.
Which of the following processes releases heat to the environment?
A.Melting
B.Evaporating
C.Subliming
D.Freezing
- 5.
Why is naphthalene used in mothballs often found to disappear over time without leaving a liquid residue?
A.It reacts with oxygen in the air.
B.It dissolves in the fabric of the clothes.
C.It undergoes sublimation directly into a gas.
D.It is compressed by the weight of the clothes.
- 6.
Which of the following would cause the vapor pressure of a liquid in a closed flask to increase?
A.Increasing the volume of the flask
B.Increasing the temperature of the liquid
C.Adding more liquid to the flask
D.Decreasing the surface area of the liquid
- 7.
Which process involves the most significant increase in the distance between particles?
A.Melting
B.Boiling
C.Freezing
D.Condensation
- 8.
Which of the following describes the enthalpy change () and entropy change () for the process of steam condensing into water?
A.is positive, is positive
B.is negative, is negative
C.is positive, is negative
D.is negative, is positive
- 9.
For a substance that expands upon freezing, what happens to its melting point as pressure is decreased?
A.The melting point increases.
B.The melting point decreases.
C.The melting point remains constant.
D.The substance will not freeze at lower pressures.
- 10.
Which of the following statements about the kinetic molecular theory is false?
A.Gas particles are in constant, random motion.
B.The volume of the actual gas particles is negligible compared to the container volume.
C.Phase changes occur when the kinetic energy exceeds the intermolecular potential energy.
D.All molecules in a liquid at a specific temperature have the exact same kinetic energy.
Download the worksheet for States of Matter - Changes of state to practice offline. It includes additional chapter-level practice questions.