Curiosity Chapter 7: Particulate Nature of Matter

A set of vocabulary flashcards covering the particulate nature of matter, states of matter, and historical perspectives based on Grade 8 Science Chapter 7.

Erosion

The process in the mountains by which rocks gradually break down into pebbles, stones, sand, and clay due to the flow of rivers.

Physical Change

A change, such as grinding chalk into powder, where only the size of a substance's specks is reduced and no new substance is formed.

Constituent Particle

The basic unit that makes up a larger piece of a substance or material.

Interparticle Spaces

The available spaces between the particles that compose matter.

Interparticle Attractions

Attractive forces that hold the constituent particles of matter together.

Acharya Kanad

An ancient Indian philosopher who first proposed the idea of a tiny, indivisible eternal particle.

Parmanu

The term used by Acharya Kanad to describe the tiny, indivisible eternal particles that make up matter.

Vaisheshika Sutras

The work in which Acharya Kanad wrote about his ideas regarding the Parmanu.

Solid State

A state of matter characterized by a definite shape, definite volume, and particles that are tightly packed.

Liquid State

A state of matter that has a definite volume but no fixed shape, taking the shape of its container.

Gaseous State

A state of matter with no fixed shape or volume, where particles move freely in all directions.

Molecular Vibrations

The to and fro motion (oscillation) of particles in a solid around their fixed positions.

Melting Point

The minimum temperature at which a solid melts to become a liquid at the atmospheric pressure.

Melting Point of Ice

$$0\,^\circ\text{C}$$

Melting Point of Urea

$$133\,^\circ\text{C}$$

Melting Point of Iron

$$1538\,^\circ\text{C}$$

Wait for Melting

The stage during heating where solid particles vibrate so vigorously they leave their fixed positions and the forces of attraction weaken.

Boiling Point

The temperature at which a liquid boils and turns into vapour at atmospheric pressure.

Evaporation

A slow process of vapour formation occurring at all temperatures, even below the boiling point, only at the surface.

Fluids

A classification for both liquids and gases because they flow and do not retain a fixed shape.

Incompressible

A property of water and most solids where their volume cannot be easily reduced by applying external pressure.

Compressibility

The ability of gases to be forced into a smaller volume by reducing the spaces between particles using external pressure.

Potassium Permanganate

A substance used in experiments to demonstrate that water particles are in constant motion.

Thermal Energy

The energy of the particles of matter that determines its physical state and the distance between particles.

Suspended Particulate Matter (SPM)

A term used in air pollution referring to tiny dust particles suspended in the air, distinct from constituent particles.

Atoms

The particles that make up elements, such as iron atoms in iron or gold atoms in gold.

Molecules

Stable particles formed when a certain number of atoms of the same or different elements combine.

Water Molecule

A stable unit made of two hydrogen atoms and one oxygen atom.

Hydrogen Molecule

A stable particle formed by the combination of two hydrogen atoms.

Incense Stick Experiment

An activity demonstrating the movement of gas particles throughout a room by the spread of fragrance.

Iodine Vapour

A purple gas used to show how gas particles spread freely inside a jar.

Soap Particles

Particles used in cleaning where one end attaches to oil and the other mixes with water to lift stains.

Fixed Positions

The state of particles in a solid where strong forces prevent them from moving past each other.

Bubble Formation

The observation that occurs during boiling as vapour forms throughout the liquid.

Atmospheric Pressure

The external pressure condition used to define standard melting and boiling points.

Physical State at High Temperature

The condition where thermal energy is high enough for particles to move freely in all directions, forming a gas.

Sand in Water

An example of an insoluble solid that settles at the bottom and occupies space, increasing the total volume.

Sugar in Water

An example of a soluble solid that dissolves by occupying interparticle spaces in the solvent.

Mortar and Pestle

Tools used in Activity 7.1 to grind pieces of chalk into a fine powder.

Magnifying glass

A tool used to observe tiny grains or specks of chalk powder.

Streaks of pink

The initial observation when potassium permanganate is dropped into water, indicating particle separation.

Temperature and Particle Movement

A relationship where heat makes particles move faster, causing substances to spread more quickly.

Negligible attractions

The level of interparticle force found in gases, allowing for maximum freedom of movement.

Limited space

The restricted area within which liquid particles move freely without separating completely.

Interparticle distance

The physical gap between particles, which drastically affects the strength of attractive forces.

Ordinary Microscope

An instrument that is insufficient to see the extremely small constituent particles of matter.

Vaisheshika

The philosophical system or school associated with Acharya Kanad's sutras.

Etymology of Parmanu

Ancient Indian term roughly equivalent to the modern scientific term 'atom'.

$200\,mL$

The specific volume of water used in the activity to demonstrate liquid volume consistency.

Iodine

A solid substance that can produce irritating vapours used to illustrate gas motion.

Uniform Pink Colour

The final state of a water solution after potassium permanganate particles have been hit and spread by water particles.

Rigidity

An implicit property of solids mentioned through their ability to maintain fixed shapes against hammering.

Hot Water

The medium in which potassium permanganate spreads the fastest due to higher particle speed.

Ice-cold Water

The medium in which potassium permanganate spreads the slowest due to lower particle speed.

Internal Space of Solids

The tiny gaps between closely packed particles that contain nothing at all, not even air.

Constituent Particles of Sugar

The millions and millions of units that make up a single tiny grain of sugar.

Taste of Sugar Solution

The sensory way to detect invisible sugar particles dissolved in water.

Spilled Water

A real-life example of a liquid that disappears over time due to the process of evaporation.

Transparent Gas Jar

Equipment used to trap and observe the spread of smoke or iodine vapour.

Syringe

A tool used without a needle to test the compression of air and water.

Plunger

The part of a syringe that is pushed inward to apply external pressure to the air inside.

Interparticle spacing in Gases

The attribute that is maximum in the gaseous state, allowing for high compressibility.

Interparticle spacing in Solids

The attribute that is minimum in the solid state, allowing particles to be closely packed.

Interparticle spacing in Liquids

The attribute that is slightly more than in solids but less than in gases.

Syringe Experiment Results

Air is compressible, while water is practically incompressible.

Vigorous Vibrations

The movement of particles when solids are heated until they reach their melting point.

Surface vs Bulk

The difference between evaporation (surface only) and boiling (formation within the liquid).

Salt in Oceans

An example of a substance existing as invisible constituent particles dissolved in a large body of water.

Rice Flour

A solid that takes the shape of its container because its individual grains are small, not because it is a liquid.

Glycerin

One of the substances referenced for drawing particle-level diagrams to represent liquids.

Methane Gas

One of the substances referenced for drawing particle-level diagrams to represent gases.

Aluminium Foil

One of the substances referenced for drawing particle-level diagrams to represent solids.

Smoke

A collection of tiny suspended particles used to represent the gaseous state and observe motion.

Candle Wax States

An example of matter existing as solid, liquid, and gas simultaneously during burning.

External Pressure

Force applied to the surface of a substance, which can reduce its volume if it is a gas.

Eternal

A characteristic attributed to 'Parmanu' by Acharya Kanad, meaning they exist forever.

Indivisible

A characteristic of 'Parmanu' meaning they cannot be broken down further into smaller pieces.

Physical Heritage

The historical scientific contributions related to the understanding of matter, such as those from India.

Oil and Soap

Chemical interaction where particles of one attach to the other to aid in washing clothes.

Finger in Water

An activity demonstrating that liquid particles can be displaced and then restored because attractions are slightly weak.

Fragrance of Perfume

A real-life experience of gas particle movement reaching the observer from a distance.

Soluble Solids

Materials like glucose or common salt that can fit into the spaces between water particles.

Volume of Solution

The total volume which is often less than the sum of the volumes of the individual components like sugar and water.

Marker or Paper Strip

Tools used to label levels in a glass vessel during displacement experiments.

Glass Plate

Equipment used to cover a gas jar and prevent smoke from escaping.

Smoke Diffusion

The filling of an entire available space by smoke particles once a barrier is removed.

Thermal Energy vs Attraction

The competition between heat energy trying to separate particles and attractive forces trying to keep them together.

States of Matter wrap-up: Solid Attraction

Maximum interparticle attraction.

States of Matter wrap-up: Gas Attraction

Minimum or negligible interparticle attraction.

States of Matter wrap-up: Liquid Attraction

Slightly weaker interparticle attraction than in solids.

States of Matter wrap-up: Solid Movement

Negligible movement restricted to vibrations.

States of Matter wrap-up: Liquid Movement

Restricted to limited space.

States of Matter wrap-up: Gas Movement

Free movement in all available space.

Atoms of Gold

The specific type of atoms that constitute the element gold.

Atoms of Iron

The specific type of atoms that constitute the element iron.

Molecule of Hydrogen

A stable particle formed by combining two atoms of hydrogen.

Oxygen Atoms

The specific atoms mentioned as being unable to exist independently in many cases.

Sulfur Atoms

One of the elements mentioned where atoms typically combine to form molecules rather than staying independent.

Interparticle Spacing Role

A key factor that determines the properties of the three physical states of matter.

Insoluble Solids Example

Sand and stone pieces, which do not break down into constituent particles that fit in water spaces.