Chemistry: Matter, Mixtures, and Separation
Each subtopic includes About section, revision page link, 10 preview questions, and practice CTAs.
Classification and Particulate Nature of Matter
SubtopicClassification and Particulate Nature of Matter under Chemistry: Matter, Mixtures, and Separation for Grade 8 IB.
Preview questions (no answers)
- 1.
Which of these statements about atoms is true?
A.Atoms are visible to the naked eye
B.Everything in the universe is made of atoms
C.Atoms cannot move
D.Atoms only exist in solids
- 2.
What is the name for the process where a gas turns into a solid?
A.Freezing
B.Deposition
C.Melting
D.Sublimation
- 3.
Which of the following is a pure substance?
A.Sea water
B.Baking soda ()
C.Milk
D.Concrete
- 4.
In the particulate nature of matter, 'diffusion' is most rapid in which state?
A.Solid
B.Liquid
C.Gas
D.Ice
- 5.
A student performs paper chromatography on a sample of purple ink. Based on the resulting chromatogram shown in the diagram, which of the following is the most accurate conclusion about the ink?
A.The ink is a pure substance because it has moved up the paper.
B.The ink is a mixture because it has been separated into different components.
C.The ink is a compound because the different colors are chemically bonded together.
D.The ink is an element because it consists of only one type of atom.
- 6.
Which of the following can be categorized as matter?
A.Light
B.Heat
C.Helium gas
D.Sound
- 7.
In the kinetic theory, 'absolute zero' is the temperature at which:
A.Water freezes.
B.All molecular motion stops.
C.A gas turns into a liquid.
D.The volume of a gas becomes infinite.
- 8.
What is the primary difference between a molecule of an element and a molecule of a compound?
A.The size of the molecule.
B.The types of atoms present.
C.The state of matter at room temperature.
D.The number of atoms in the molecule.
- 9.
Which of the following is a homogeneous mixture?
A.Muddied water
B.A bowl of cereal
C.Vinegar
D.A granite rock
- 10.
In chromatography, if a component is very soluble in the solvent, its value will be:
A.Close to 0
B.Exactly 1.0
C.Close to 1
D.Negative
Download the worksheet for Chemistry: Matter, Mixtures, and Separation - Classification and Particulate Nature of Matter to practice offline. It includes additional chapter-level practice questions.
States of Matter and Kinetic Particle Theory
SubtopicStates of Matter and Kinetic Particle Theory under Chemistry: Matter, Mixtures, and Separation for Grade 8 IB.
Preview questions (no answers)
- 1.
What is the movement of particles from an area of higher concentration to an area of lower concentration called?
A.Effusion
B.Diffusion
C.Infusion
D.Confusion
- 2.
Which of the following is a pure substance made of only one type of atom?
A.Mixture
B.Compound
C.Element
D.Solution
- 3.
If the temperature of a gas is decreased in a sealed container, the pressure will:
A.Increase
B.Stay the same
C.Decrease
D.Double
- 4.
Which change of state requires an input of heat energy?
A.Condensation
B.Freezing
C.Melting
D.Deposition
- 5.
The diagram illustrates the theoretical path of a gas particle as it moves through a vacuum compared to its path through a space filled with air particles. Based on the kinetic particle theory, why does it take significantly longer for a gas to diffuse across a room filled with air than through a vacuum?
A.Collisions with air particles cause the gas particle to follow a longer, zig-zag path to reach its destination.
B.The air particles exert attractive forces that pull the gas particles backward, slowing their progress.
C.Gas particles lose a large portion of their kinetic energy every time they collide with air particles.
D.The presence of air particles increases the surrounding pressure, which causes the gas particles to shrink and move more slowly.
- 6.
What is the relationship between the average kinetic energy of particles and the Kelvin temperature of a substance?
A.They are inversely proportional.
B.The kinetic energy is equal to the square of the temperature.
C.They are directly proportional.
D.There is no relationship between them.
- 7.
In which state of matter are particles vibrating about a fixed point?
A.Solid
B.Liquid
C.Gas
D.None of the above
- 8.
Why does ice float on water, considering particle arrangement?
A.The particles in ice have more kinetic energy.
B.The particles in ice are more closely packed than in liquid water.
C.The particles in ice are arranged in an open hexagonal lattice, making it less dense than liquid water.
D.The particles in ice are smaller than the particles in liquid water.
- 9.
Which of the following statements about gas pressure is true?
A.Pressure is independent of the number of particles.
B.Pressure increases if the volume of the container increases at constant temperature.
C.Pressure is the result of collisions between gas particles and the container walls.
D.Pressure decreases if the temperature of the gas increases at constant volume.
- 10.
In the context of KPT, what defines a 'pure' substance during a phase change?
A.It changes state over a range of temperatures.
B.It changes state at a single, sharp temperature.
C.It can only exist in one state of matter.
D.It does not contain any atoms.
Download the worksheet for Chemistry: Matter, Mixtures, and Separation - States of Matter and Kinetic Particle Theory to practice offline. It includes additional chapter-level practice questions.
Pure and Impure Substances
SubtopicPure and Impure Substances under Chemistry: Matter, Mixtures, and Separation for Grade 8 IB.
Preview questions (no answers)
- 1.
Which of the following contains only one type of molecule?
A.Air
B.Pure water
C.Orange juice
D.Sea water
- 2.
What separation technique is used to separate coffee grounds from liquid coffee?
A.Distillation
B.Filtration
C.Chromatography
D.Magnetism
- 3.
Which of these describes a 'solvent'?
A.The substance that gets dissolved
B.The liquid that dissolves the solute
C.The solid that stays on the filter paper
D.A type of chemical bond
- 4.
What is the symbol for the element Oxygen?
A.Ox
B.O
C.Oy
D.Og
- 5.
A student performs an experiment with iron and sulfur as shown in the flowchart. Initially, the iron filings can be separated from the sulfur powder using a magnet. After strong heating, the substances form a black solid that is no longer attracted to a magnet. Based on the observations in the flowchart, which of the following correctly classifies the gray powder and the black solid?
A.Gray powder: Compound; Black solid: Mixture
B.Gray powder: Mixture; Black solid: Pure element
C.Gray powder: Mixture; Black solid: Compound
D.Gray powder: Pure substance; Black solid: Mixture
- 6.
What identifies an 'aqueous' solution?
A.The solute is a liquid
B.The solvent is water
C.The solution is acidic
D.The solution is very hot
- 7.
Which of the following is NOT a physical separation technique?
A.Electrolysis of water into hydrogen and oxygen
B.Centrifugation of blood to separate plasma
C.Decanting oil from water
D.Sieving flour to remove lumps
- 8.
Which of the following would be the most effective way to separate a mixture of two gases with very similar boiling points?
A.Simple distillation
B.Gas chromatography
C.Filtration
D.Magnetism
- 9.
A student wants to separate a mixture of hexane (BP ) and heptane (BP ). Which equipment is essential for a high-purity separation?
A.A simple Liebig condenser without a column.
B.A fractionating column.
C.A separating funnel.
D.A Buchner funnel.
- 10.
Which separation method is based on the difference in the size of particles?
A.Chromatography
B.Filtration
C.Distillation
D.Crystallization
Download the worksheet for Chemistry: Matter, Mixtures, and Separation - Pure and Impure Substances to practice offline. It includes additional chapter-level practice questions.
Solutions, Suspensions, Colloids, Emulsions, and the Tyndall Effect
SubtopicSolutions, Suspensions, Colloids, Emulsions, and the Tyndall Effect under Chemistry: Matter, Mixtures, and Separation for Grade 8 IB.
Preview questions (no answers)
- 1.
A mixture of oil, water, and soap where the soap helps the oil stay mixed in the water is an:
A.Emulsion
B.Alloy
C.Element
D.Pure substance
- 2.
If you add a lot of salt to a small amount of water until salt stays at the bottom, the solution is:
A.Dilute
B.Unsaturated
C.Saturated
D.Concentrated and unsaturated
- 3.
Which statement about colloids is TRUE?
A.Their particles settle out
B.They can be separated by simple filtration
C.They scatter light
D.They are always made of two gases
- 4.
Why can you see the sun's rays through a dusty room?
A.The Tyndall effect
B.Reflection of the walls
C.The dust creates a solution
D.Refraction of glass
- 5.
Which of the following describes a 'supersaturated' solution?
A.A solution that contains less solute than it can normally hold.
B.A solution that contains exactly the maximum amount of solute.
C.A solution that contains more dissolved solute than is normally possible at that temperature.
D.A solution that has been diluted with extra solvent.
- 6.
When a small amount of detergent is added to an oil-and-water mixture, the oil breaks into tiny droplets that stay mixed. The detergent is acting as a/an:
A.Solvent
B.Emulsifying agent
C.Suspension
D.Solute
- 7.
Which factor describes the maximum amount of solute that can dissolve in a specific amount of solvent at a given temperature?
A.Concentration
B.Solubility
C.Molarity
D.Viscosity
- 8.
What happens to the path of light in the Tyndall effect as the concentration of colloidal particles increases (within limits)?
A.The path becomes less visible because light is absorbed.
B.The path becomes more distinct and visible.
C.The path disappears because the particles are too close together.
D.The color of the path changes to the red end of the spectrum.
- 9.
In a colloidal system, if the dispersed phase is a liquid and the dispersion medium is a liquid, the system is specifically called an:
A.Aerosol
B.Emulsion
C.Sol
D.Gel
- 10.
Which of the following is a liquid-in-solid colloid?
A.Cheese
B.Fog
C.Milk
D.Sponge
Download the worksheet for Chemistry: Matter, Mixtures, and Separation - Solutions, Suspensions, Colloids, Emulsions, and the Tyndall Effect to practice offline. It includes additional chapter-level practice questions.
Changes of State and Interconversion of Matter
SubtopicChanges of State and Interconversion of Matter under Chemistry: Matter, Mixtures, and Separation for Grade 8 IB.
Preview questions (no answers)
- 1.
What is the name for the flat parts of a heating curve where the temperature does not change?
A.Boiling points only
B.Melting points only
C.Phase change plateaus
D.Cooling points
- 2.
What happens to the mass of a substance when it changes state?
A.It increases
B.It decreases
C.It stays the same
D.It doubles
- 3.
Which state of matter has the strongest forces of attraction between its particles?
A.Gas
B.Liquid
C.Solid
D.Steam
- 4.
Which process is occurring when dew forms on grass in the morning?
A.Evaporation
B.Melting
C.Condensation
D.Sublimation
- 5.
If 50g of liquid water is frozen, how much ice will be produced in terms of mass?
A.More than 50g
B.Less than 50g
C.Exactly 50g
D.It depends on the shape of the container
- 6.
During which transition do particles lose the most kinetic energy?
A.Gas to liquid
B.Solid to liquid
C.Liquid to gas
D.Liquid to solid
- 7.
Which state of matter has a fixed shape?
A.Solid
B.Liquid
C.Gas
D.None of the above
- 8.
Which of the following is true regarding the particles in a liquid compared to those in a gas?
A.Liquid particles have more potential energy.
B.Gas particles have weaker intermolecular attractions.
C.Liquid particles move in straight lines without colliding.
D.Gas particles are arranged in a regular pattern.
- 9.
If the particles of a substance are vibrating in fixed positions, and then begin to slide over each other while remaining close together, what has occurred?
A.The substance has reached its boiling point.
B.The substance has reached its melting point.
C.The substance has undergone sublimation.
D.The substance has reached absolute zero.
- 10.
What distinguishes a pure substance from a mixture based on its boiling point?
A.A pure substance boils at a single, sharp temperature, while a mixture boils over a range.
B.A mixture always has a lower boiling point than its components.
C.Pure substances only boil at .
D.Mixtures do not have boiling points.
Download the worksheet for Chemistry: Matter, Mixtures, and Separation - Changes of State and Interconversion of Matter to practice offline. It includes additional chapter-level practice questions.
Separation Techniques (Filtration, Distillation, Chromatography, and Centrifugation)
SubtopicSeparation Techniques (Filtration, Distillation, Chromatography, and Centrifugation) under Chemistry: Matter, Mixtures, and Separation for Grade 8 IB.
Preview questions (no answers)
- 1.
In chromatography, the value is a ratio used to compare substances. It stands for:
A.Rapid Flow
B.Retention Factor
C.Relative Filter
D.Residue Fraction
- 2.
What is the main advantage of using a centrifuge instead of just letting a mixture sit?
A.It changes the color
B.It is much faster
C.It makes the liquid boil
D.It turns solids into liquids
- 3.
Which part of the distillation apparatus contains the cold water to help cool the gas?
A.The Bunsen burner
B.The thermometer
C.The condenser jacket
D.The tripod
- 4.
A student wants to separate a mixture of pebbles and water. Which is the easiest method?
A.Distillation
B.Chromatography
C.Filtration
D.Centrifugation
- 5.
Which of the following is the most likely value for a substance that has a high affinity for the mobile phase and low affinity for the stationary phase?
A.0.1
B.0.0
C.0.9
D.1.5
- 6.
A student finds that a dye spot on a chromatogram has not moved from the baseline. What is the most likely reason?
A.The dye is very soluble in the solvent
B.The dye is insoluble in the solvent used
C.The solvent moved too quickly
D.The paper was too thick
- 7.
If you wanted to separate a mixture of salt, sand, and iron filings, which order of techniques would be most logical?
A.Distillation, then chromatography, then filtration
B.Magnet, then add water/filter, then evaporate the water
C.Evaporation, then magnet, then filtration
D.Centrifugation, then distillation, then magnet
- 8.
During chromatography, why must the spot of sample be kept as small as possible?
A.To save on the amount of chemicals used.
B.To prevent the spots from spreading out (tailing) and overlapping during separation.
C.To make the calculation more difficult.
D.Small spots travel faster than large spots.
- 9.
In the separation of crude oil into petrol, diesel, and kerosene, which technique is utilized on an industrial scale?
A.Simple Distillation.
B.Fractional Distillation.
C.Chromatography.
D.Filtration.
- 10.
What is the role of the 'Theoretical Plate' in fractional distillation?
A.It is a physical plate placed inside the flask.
B.It represents a single cycle of evaporation and condensation in the column.
C.It is the thermometer used to measure the temperature.
D.It is the amount of heat required to boil one mole of liquid.
Download the worksheet for Chemistry: Matter, Mixtures, and Separation - Separation Techniques (Filtration, Distillation, Chromatography, and Centrifugation) to practice offline. It includes additional chapter-level practice questions.