States of Matter and Separation
Each subtopic includes About section, revision page link, 10 preview questions, and practice CTAs.
States and Properties of Matter
SubtopicStates and Properties of Matter under States of Matter and Separation for Grade 9 IB.
Preview questions (no answers)
- 1.
Which state of matter has no definite shape but does have a definite volume?
A.Solid
B.Liquid
C.Gas
D.Steam
- 2.
Which of these substances has the highest boiling point?
A.Water
B.Oxygen
C.Iron
D.Alcohol
- 3.
The temperature at which a solid becomes a liquid is the:
A.Boiling point
B.Melting point
C.Freezing point
D.Sublimation point
- 4.
What happens to the density of a gas if its volume is decreased (at constant mass)?
A.Density increases
B.Density decreases
C.Density stays the same
D.Density becomes zero
- 5.
Why can diffusion happen in liquids but much more slowly than in gases?
A.Liquid particles have no kinetic energy.
B.Liquid particles are much larger than gas particles.
C.Liquid particles are closer together and collide more frequently, hindering movement.
D.Gases are more dense than liquids.
- 6.
What happens to the volume of most solids when they are heated (before they melt)?
A.It decreases because particles vibrate less.
B.It increases because particles vibrate more and push each other apart.
C.It remains exactly the same.
D.It increases because the particles themselves expand.
- 7.
The strength of intermolecular forces is strongest in which of the following?
A.Argon gas
B.Liquid ethanol
C.Solid sodium chloride
D.Liquid mercury
- 8.
The diagram below represents a closed system where a liquid and its vapor have reached dynamic equilibrium at a constant temperature. represents the rate of evaporation and represents the rate of condensation. If the volume of the container is suddenly increased (for example, by pulling a piston upwards) while maintaining the same temperature, which statement correctly describes the initial effect on these rates before a new equilibrium is established?
A.The rate increases because the reduction in gas pressure allows liquid molecules to escape into the vapor phase with less resistance.
B.The rate decreases because the vapor particles are now distributed in a larger volume, reducing the frequency of their collisions with the liquid surface.
C.Both and decrease because the thermal energy of the system is dissipated over a larger volume, lowering the average kinetic energy.
D.The rate remains constant while decreases because the particles require more energy to travel the increased distance to the top of the container.
- 9.
Which characteristic of a chromatogram allows you to identify a substance by comparing it to a standard?
A.The color of the spot.
B.The size of the spot.
C.The Retention Factor () value.
D.The time taken to dry the paper.
- 10.
A substance has a melting point of and a boiling point of . What is its state at ?
A.Solid
B.Liquid
C.Gas
D.Plasma
Download the worksheet for States of Matter and Separation - States and Properties of Matter to practice offline. It includes additional chapter-level practice questions.
Kinetic Theory of Matter
SubtopicKinetic Theory of Matter under States of Matter and Separation for Grade 9 IB.
Preview questions (no answers)
- 1.
What is the primary reason gases exert pressure on the walls of their container?
A.Particles resting on the bottom
B.Particles vibrating in place
C.Particles colliding with the walls
D.Particles being attracted to the walls
- 2.
What is the solvent in 'aqueous copper sulfate'?
A.Copper
B.Sulfate
C.Water
D.Copper sulfate
- 3.
Which of these processes is exothermic (releases heat)?
A.Melting
B.Boiling
C.Freezing
D.Sublimation
- 4.
What is the Rf value in chromatography used for?
A.To measure the temperature
B.To identify a substance
C.To measure the mass
D.To speed up the process
- 5.
According to the kinetic theory of matter, how does a gas inside a rigid container exert pressure on the container's walls?
A.Through the electrostatic repulsion between the individual gas particles as they move past each other.
B.Through the combined weight of the gas particles as they settle at the bottom of the container.
C.Through the frequent collisions of the moving gas particles with the internal surfaces of the container.
D.Through the expansion of the individual gas particles themselves as they absorb thermal energy.
- 6.
Which of the following describes the change of state from gas to liquid?
A.Evaporation
B.Condensation
C.Melting
D.Freezing
- 7.
In the kinetic theory, how are the forces of attraction described in an ideal gas?
A.Extremely strong, holding particles together.
B.Medium, allowing particles to slide.
C.Negligible or non-existent.
D.Increasing as the temperature increases.
- 8.
Which of the following statements is true for a substance undergoing deposition?
A.It changes from a gas directly to a solid, releasing energy to the surroundings.
B.It changes from a solid directly to a gas, absorbing energy from the surroundings.
C.The particles gain kinetic energy during the process.
D.The process occurs at a temperature above the boiling point.
- 9.
In a mixture of ethanol (BP ) and water (BP ), why is it impossible to obtain 100% pure ethanol by simple distillation?
A.Ethanol and water form an azeotrope where the vapour has the same composition as the liquid at a certain concentration.
B.The boiling points are too close for the condenser to distinguish between them.
C.Ethanol molecules are attracted to water molecules by hydrogen bonding.
D.Simple distillation can only separate solids from liquids.
- 10.
A student observes that a perfume smell spreads across a room. This is primarily due to:
A.The random motion of perfume particles colliding with air molecules (diffusion).
B.Convection currents pulling the perfume molecules toward the ceiling.
C.The perfume molecules being lighter than air and floating.
D.The attractive forces between perfume molecules and the walls of the room.
Download the worksheet for States of Matter and Separation - Kinetic Theory of Matter to practice offline. It includes additional chapter-level practice questions.
Changes of State and Diffusion
SubtopicChanges of State and Diffusion under States of Matter and Separation for Grade 9 IB.
Preview questions (no answers)
- 1.
What state of matter exists inside a neon sign?
A.Solid
B.Liquid
C.Gas/Plasma
D.Crystal
- 2.
Molecules of which gas will diffuse the fastest at the same temperature?
A.Heavy molecules
B.Light molecules
C.Medium molecules
D.They all diffuse at the same rate
- 3.
Which of the following is NOT a state of matter?
A.Solid
B.Liquid
C.Energy
D.Gas
- 4.
What happens to the particles of a liquid when it freezes?
A.They gain energy and move faster
B.They lose energy and move slower
C.They stay the same
D.They turn into atoms
- 5.
When a liquid evaporates, why does the remaining liquid cool down?
A.Cold particles from the air enter the liquid.
B.The fastest (highest energy) particles escape the surface, leaving slower particles behind.
C.The liquid absorbs cold from the surroundings.
D.Evaporation is an exothermic process.
- 6.
In the kinetic theory of gases, what is assumed about the collisions between gas particles?
A.They are perfectly elastic (no energy is lost).
B.They result in the particles sticking together.
C.They cause the particles to slow down over time.
D.They only happen between the particles and the walls of the container.
- 7.
Which of these processes is exothermic?
A.Melting
B.Evaporation
C.Sublimation
D.Freezing
- 8.
Which gas would diffuse approximately 1.41 (square root of 2) times faster than Oxygen ()?
A.Hydrogen ()
B.Helium ()
C.Methane ()
D.Carbon monoxide ()
- 9.
Which of the following is a result of the high surface tension of water?
A.Water evaporates quickly.
B.Ice floats on liquid water.
C.Small insects can walk on the surface of water.
D.Water is a universal solvent.
- 10.
How does the movement of particles in a liquid differ from that in a gas?
A.Liquid particles have no kinetic energy.
B.Liquid particles are in fixed positions.
C.Liquid particles are much closer together and have restricted translation.
D.Gas particles move slower than liquid particles at the same temperature.
Download the worksheet for States of Matter and Separation - Changes of State and Diffusion to practice offline. It includes additional chapter-level practice questions.
Brownian Motion
SubtopicBrownian Motion under States of Matter and Separation for Grade 9 IB.
Preview questions (no answers)
- 1.
Which of these is a direct application of the kinetic theory shown by Brownian motion?
A.Calculating the speed of light
B.Understanding how smells spread in a room (diffusion)
C.Measuring the weight of a planet
D.Finding the pH of a liquid
- 2.
The term 'random' in Brownian motion means:
A.The motion has no specific direction or pattern
B.The motion follows a circle
C.The motion only happens once
D.The motion is caused by gravity
- 3.
Brownian motion can be observed in a 'smoke cell' which contains:
A.Pure vacuum
B.Air and smoke
C.Water and oil
D.Solid carbon
- 4.
Why do larger particles show less Brownian motion than smaller ones?
A.They are too heavy for collisions to move them significantly
B.They have no kinetic energy
C.Molecules cannot hit large particles
D.They are made of different atoms
- 5.
In the kinetic molecular theory, 'absolute zero' is the temperature at which:
A.Water freezes
B.All molecular motion stops
C.Gases turn into liquids
D.Particles move at the speed of light
- 6.
Which state of matter has a definite volume but no definite shape?
A.Solid
B.Liquid
C.Gas
D.All of the above
- 7.
What is the purpose of the fractionating column in fractional distillation?
A.To increase the temperature of the vapor
B.To provide a large surface area for repeated condensation and evaporation
C.To collect the final liquid product
D.To filter out solid impurities
- 8.
Which separation method would be most appropriate for obtaining pure water from sea water?
A.Distillation
B.Filtration
C.Chromatography
D.Magnetic Separation
- 9.
In the context of kinetic theory, what happens when a gas is compressed isothermally (at constant temperature)?
A.The frequency of collisions with the walls increases, but the average kinetic energy of the particles remains the same.
B.The particles slow down because they have less room to move.
C.The particles speed up because they are being squeezed.
D.The particles lose energy to the surroundings, causing the temperature to drop.
- 10.
How does the size of the suspended particle affect the 'jaggedness' of its Brownian path?
A.Smaller particles show more jagged paths because they are more easily deflected by individual molecular collisions.
B.Larger particles show more jagged paths because they have more surface area for collisions.
C.Size has no effect on the shape of the path, only on the speed.
D.The path becomes a straight line for very small particles.
Download the worksheet for States of Matter and Separation - Brownian Motion to practice offline. It includes additional chapter-level practice questions.
Elements, Compounds, and Mixtures
SubtopicElements, Compounds, and Mixtures under States of Matter and Separation for Grade 9 IB.
Preview questions (no answers)
- 1.
Which of the following is the chemical symbol for Carbon?
A.B.C.D. - 2.
Which of these is a common use for fractional distillation?
A.Purifying salt
B.Separating crude oil into fuels
C.Removing sand from water
D.Testing for oxygen
- 3.
What are the small particles that make up all matter?
A.Cells
B.Atoms
C.Dust
D.Grains
- 4.
Which process is used to separate salt from seawater to obtain drinking water?
A.Filtration
B.Simple Distillation
C.Magnetic separation
D.Chromatography
- 5.
A mixture of cooking oil (density ) and water (density ) is poured into the separating funnel shown below. Which statement correctly describes how the components will be separated?
A.Layer A is water and it will be the first liquid collected from the tap.
B.Layer B is water and it will be the first liquid collected from the tap.
C.Layer A is oil and it will be the first liquid collected from the tap.
D.Layer B is oil and it will be the first liquid collected from the tap.
- 6.
The diagram represents the different stages of heating a pure solid substance until it becomes a gas. If Stage B represents the process of melting, in which stage is the substance entirely in the liquid state and gaining kinetic energy?
A.Stage A
B.Stage C
C.Stage D
D.Stage E
- 7.
A sample of air is a mixture of several gases, such as nitrogen and oxygen, and has a uniform composition throughout. According to the classification chart provided, which label correctly identifies the category for air?
A.Label A
B.Label B
C.Label C
D.Label D
- 8.
Why is the boiling point of a substance considered a 'characteristic property'?
A.It is unique to a pure substance and does not depend on the amount of the substance.
B.It changes depending on the volume of the liquid being boiled.
C.It is the same for all liquids at a given altitude.
D.It can be used to determine the chemical reactivity of the substance.
- 9.
Which of the following would increase the rate of diffusion of a gas?
A.Increasing the temperature of the gas.
B.Increasing the molar mass of the gas particles.
C.Decreasing the surface area of the container.
D.Increasing the external pressure on the gas.
- 10.
Which of the following contains only elements?
A.Nitrogen, Oxygen, and Argon
B.Air, Water, and Soil
C.Carbon dioxide, Methane, and Ammonia
D.Salt, Sugar, and Baking soda.
Download the worksheet for States of Matter and Separation - Elements, Compounds, and Mixtures to practice offline. It includes additional chapter-level practice questions.
Emulsions and Suspensions
SubtopicEmulsions and Suspensions under States of Matter and Separation for Grade 9 IB.
Preview questions (no answers)
- 1.
Which of the following describes the movement of particles in a liquid?
A.Vibrating in a fixed position
B.Moving randomly and sliding past each other
C.Moving at very high speeds with no contact
D.Not moving at all
- 2.
In a water-in-oil emulsion, which substance is the dispersion medium?
A.Water
B.Oil
C.Air
D.Salt
- 3.
Paint is often considered a suspension. If paint sits on a shelf for a year, what would you expect to see?
A.It turns into a gas
B.The pigment particles settle at the bottom
C.It becomes a transparent solution
D.The volume increases significantly
- 4.
What is the state of matter of the 'fat droplets' in milk?
A.Solid
B.Liquid
C.Gas
D.Plasma
- 5.
The following diagram illustrates the internal composition of two different heterogeneous mixtures, A and B. Which statement correctly identifies the type of each mixture and the most appropriate laboratory technique for separating their primary components?
A.Mixture A is a suspension and is separated by evaporation; Mixture B is an emulsion and is separated by filtration.
B.Mixture A is an emulsion and is separated using a separating funnel; Mixture B is a suspension and is separated by filtration.
C.Mixture A is a solution and is separated by chromatography; Mixture B is a colloid and is separated by distillation.
D.Mixture A is an emulsion and is separated by filtration; Mixture B is a suspension and is separated using a separating funnel.
- 6.
If a suspension is very concentrated and the particles are very small, it might be mistaken for a:
A.Pure substance
B.Solution
C.Colloid
D.Gas
- 7.
Which statement correctly describes the particles in a solution?
A.They are visible to the naked eye.
B.They can be separated by filtration.
C.They are at the molecular or ionic level and do not settle.
D.They scatter a beam of light intensely.
- 8.
In a laboratory setting, which equipment is specifically used to apply high-speed rotation to accelerate the sedimentation of a suspension?
A.Burette
B.Centrifuge
C.Reflux condenser
D.Spatula
- 9.
When salt is added to a suspension of silt in river water (as it enters the ocean), the silt settles rapidly. What is this process called?
A.Distillation
B.Flocculation (or Coagulation)
C.Sublimation
D.Emulsification
- 10.
Which statement best describes the 'Hydrophile-Lipophile Balance' (HLB) scale?
A.It measures the boiling point of a surfactant.
B.It is an arbitrary scale from 0-20 that indicates the relative affinity of a surfactant for oil or water.
C.It measures the density of a suspension.
D.It is the ratio of the volume of the dispersed phase to the continuous phase.
Download the worksheet for States of Matter and Separation - Emulsions and Suspensions to practice offline. It includes additional chapter-level practice questions.
Separation Techniques (Filtration, Crystallization, Distillation, Chromatography)
SubtopicSeparation Techniques (Filtration, Crystallization, Distillation, Chromatography) under States of Matter and Separation for Grade 9 IB.
Preview questions (no answers)
- 1.
Which of the following can be separated using a separating funnel?
A.Water and Salt
B.Water and Oil
C.Water and Alcohol
D.Water and Sugar
- 2.
What do we call the point at which a solid changes into a liquid?
A.Boiling point
B.Freezing point
C.Melting point
D.Condensation point
- 3.
Which technique would separate copper sulfate crystals from a copper sulfate solution?
A.Filtration
B.Crystallization
C.Simple distillation
D.Chromatography
- 4.
What is the main difference between evaporation and boiling?
A.Evaporation only happens at
B.Boiling only happens at the surface
C.Evaporation happens at any temperature
D.They are exactly the same
- 5.
A student is given a mixture of sand and an aqueous solution of potassium nitrate. They wish to separate this mixture to recover three distinct products: dry sand, potassium nitrate crystals, and pure water. The student follows the flowchart shown below. Which of the following identifies the correct techniques for Process 1 and Process 2?
A.Process 1: Filtration; Process 2: Evaporation to dryness
B.Process 1: Simple distillation; Process 2: Filtration
C.Process 1: Filtration; Process 2: Simple distillation
D.Process 1: Crystallization; Process 2: Chromatography
- 6.
What determines how far a substance travels in paper chromatography?
A.Its solubility in the mobile phase and its attraction to the stationary phase.
B.Only its molar mass.
C.The amount of the substance used.
D.The temperature of the room.
- 7.
A student performs chromatography on a black ink. Four spots appear: red, blue, yellow, and clear. What does this indicate about the black ink?
A.The ink is a pure substance.
B.The ink is a mixture of at least three colored pigments.
C.The ink has reacted with the paper.
D.The ink is too old to be used.
- 8.
In a lab, you are given a solution of salt in water. You need to obtain both the salt and the water as pure substances. Which technique must you use?
A.Evaporation
B.Crystallization
C.Simple Distillation
D.Filtration
- 9.
What happens to the particles of a substance during the process of sublimation?
A.They gain enough kinetic energy to overcome all intermolecular forces and move directly from a fixed lattice to a random gas state.
B.They lose energy and move closer together.
C.They slide over each other as the substance becomes a liquid.
D.They stop moving entirely at the sublimation point.
- 10.
A student separates a mixture of three liquids using fractional distillation. The thermometer readings during the collection of the three fractions were , , and . Which fraction is likely the most pure?
A.The first fraction, because it has the smallest temperature range.
B.The third fraction, because it is at the highest temperature.
C.The first and second fractions are equally pure as they both have a range.
D.None of the fractions are pure as they all show a range of temperatures.
Download the worksheet for States of Matter and Separation - Separation Techniques (Filtration, Crystallization, Distillation, Chromatography) to practice offline. It includes additional chapter-level practice questions.