Matter – Complete Notes (NEET Chemistry)
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| Matter in Chemistry: Learn the states of matter, classification, atoms, molecules, compounds, and mixtures with easy diagrams. |
Chapter 1: Matter Around Us
What is Matter?
Definition:
Anything that has mass and occupies space (volume) is called matter.
Examples
Water
Air
Wood
Iron
Human body
Oxygen
Characteristics of Matter
Matter is made up of tiny particles called constituent particles.
These particles have the following properties:
1. Particles are in Continuous Motion
The particles of matter are always moving.
Solids → Vibrate about fixed positions.
Liquids → Move freely.
Gases → Move very fast.
Example: Perfume smell spreads throughout a room.
2. Particles have Spaces Between Them
There is empty space between particles.
The space is:
Least in solids
More in liquids
Maximum in gases
Example: Sugar dissolves in water because sugar particles occupy spaces between water particles.
3. Particles Attract Each Other
Particles attract one another.
Strength of attraction:
Solid > Liquid > Gas
Because of attraction:
Solids have definite shape.
Liquids have definite volume.
Gases have neither definite shape nor definite volume.
Physical States of Matter
Matter exists in three common physical states.
| State | Shape | Volume | Particle Arrangement |
|---|---|---|---|
| Solid | Fixed | Fixed | Very closely packed |
| Liquid | No fixed shape | Fixed | Less closely packed |
| Gas | No fixed shape | No fixed volume | Very far apart |
Solids
Properties
Fixed shape
Fixed volume
High density
Strong intermolecular force
Least compressible
Examples
Ice
Iron
Wood
Stone
Liquids
Properties
No fixed shape
Fixed volume
Flow easily
Slightly compressible
Examples
Water
Milk
Oil
Petrol
Gases
Properties
No fixed shape
No fixed volume
Highly compressible
Very low density
Examples
Oxygen
Nitrogen
Carbon dioxide
Representative Particles of Matter
Matter is represented by three basic particles.
1. Atom
Definition
The smallest particle of an element that retains its chemical properties.
Examples
He
Na
Cu
Fe
Important Point
Noble gases exist as single atoms.
2. Molecule
Definition
The smallest particle of a substance that can exist independently.
A molecule consists of two or more atoms chemically bonded together.
Examples
O₂
N₂
H₂O
CO₂
NH₃
CH₄
3. Formula Unit
Definition
The simplest whole-number ratio of ions present in an ionic compound.
Used for ionic compounds because ions do not exist as separate molecules.
Examples
NaCl
MgO
CaCl₂
KBr
Formula Unit is Used For
Ionic compounds
Giant ionic crystals
Covalent Network Solids
Some covalent compounds do not exist as molecules.
They exist as giant networks.
Examples
SiO₂ (Quartz)
Diamond
Graphite
Classification of Matter
Matter
↓
1. Pure Substance
Contains only one kind of representative particle.
Examples
Gold
Water
Sodium chloride
Pure substances have:
Fixed composition
Fixed properties
Sharp melting point
Sharp boiling point
Pure Substance is Divided Into
A. Elements
Definition
A pure substance made of only one type of atom.
Cannot be broken into simpler substances by chemical methods.
Examples
Hydrogen
Oxygen
Copper
Iron
Gold
Types of Elements
Metals
Examples
Iron
Copper
Aluminium
Properties
Conduct electricity
Malleable
Ductile
Non-metals
Examples
Oxygen
Nitrogen
Sulfur
Properties
Poor conductors
Brittle
Non-lustrous
Metalloids
Examples
Silicon
Germanium
Properties
Show properties of both metals and non-metals.
B. Compounds
Definition
A pure substance formed by the chemical combination of two or more elements in a fixed ratio.
Examples
Water → H₂O
Carbon dioxide → CO₂
Sodium chloride → NaCl
Ammonia → NH₃
Characteristics of Compounds
Fixed composition
New properties
Cannot be separated by physical methods
Can be separated chemically
Mixtures
Definition
A physical combination of two or more substances in any proportion.
Properties
Variable composition
Components retain their properties
Can be separated physically
Examples
Air
Salt water
Soil
Milk
Types of Mixtures
1. Homogeneous Mixture
Definition
Composition is uniform throughout.
Components cannot be seen separately.
Examples
Sugar solution
Salt solution
Air
Vinegar
2. Heterogeneous Mixture
Definition
Composition is not uniform.
Components are visible.
Examples
Sand and water
Oil and water
Soil
Granite
Difference Between Pure Substance and Mixture
| Pure Substance | Mixture |
|---|---|
| Fixed composition | Variable composition |
| One type of particle | Two or more particles |
| Sharp melting point | Melting over a range |
| Cannot be separated physically | Can be separated physically |
Difference Between Element and Compound
| Element | Compound |
|---|---|
| One type of atom | Two or more elements |
| Cannot be broken chemically | Can be decomposed chemically |
| Symbol represents it | Formula represents it |
Difference Between Atom, Molecule and Formula Unit
| Atom | Molecule | Formula Unit |
|---|---|---|
| Smallest particle of an element | Smallest independently existing particle | Simplest ratio of ions |
| He | H₂O | NaCl |
| Used for elements | Used for covalent compounds | Used for ionic compounds |
Important NEET Points
Matter has mass and occupies space.
Particles are always moving.
Attraction between particles is strongest in solids.
Formula unit is used only for ionic compounds.
Molecules are used for covalent compounds.
Noble gases exist as monoatomic molecules (single atoms).
Air is a homogeneous mixture.
Soil is a heterogeneous mixture.
Diamond and SiO₂ are covalent network solids.
NEET Previous-Type MCQs
1. Matter is anything that has:
A) Colour
B) Shape
C) Mass and occupies space
D) Smell
Answer: C
2. Which state of matter is most compressible?
A) Solid
B) Liquid
C) Gas
D) Plasma
Answer: C
3. Formula unit is used for:
A) Water
B) Oxygen
C) Sodium chloride
D) Carbon dioxide
Answer: C
4. Which is a homogeneous mixture?
A) Sand and water
B) Soil
C) Air
D) Oil and water
Answer: C
5. Which is a compound?
A) Iron
B) Gold
C) Water
D) Oxygen
Answer: C
6. Which exists as single atoms?
A) Oxygen
B) Nitrogen
C) Helium
D) Hydrogen
Answer: C
7. Which has the strongest intermolecular force?
A) Gas
B) Liquid
C) Solid
D) Plasma
Answer: C
Chapter Summary
Matter has mass and occupies space.
Matter is made of tiny particles that are always in motion and attract each other.
Matter exists mainly as solids, liquids, and gases.
Representative particles are atoms, molecules, and formula units.
Matter is classified into pure substances (elements and compounds) and mixtures (homogeneous and heterogeneous).
Understanding these basic concepts is essential for NEET Chemistry and forms the foundation for later chapters on atomic structure, chemical bonding, and states of matter.
Matter – Important Questions and Answers (CBSE Class 11 Chemistry)
Chapter: Some Basic Concepts of Chemistry – Matter
Exam-Oriented Question Bank
Part A: Multiple Choice Questions (MCQs)
1. Matter is anything that has:
A) Colour
B) Smell
C) Mass and occupies space
D) Shape
Answer: C
2. Which state of matter has a definite shape and definite volume?
A) Gas
B) Liquid
C) Solid
D) Plasma
Answer: C
3. Which state of matter is highly compressible?
A) Solid
B) Liquid
C) Gas
D) Ice
Answer: C
4. The smallest particle capable of independent existence is
A) Atom
B) Electron
C) Molecule
D) Proton
Answer: C
5. Formula unit is used for
A) Water
B) Oxygen
C) Sodium chloride
D) Hydrogen
Answer: C
6. Which one is a homogeneous mixture?
A) Oil and water
B) Air
C) Sand and water
D) Soil
Answer: B
7. Which one is a heterogeneous mixture?
A) Sugar solution
B) Salt solution
C) Air
D) Soil
Answer: D
8. Which is an element?
A) Water
B) Carbon dioxide
C) Copper
D) Sodium chloride
Answer: C
9. Which of the following is a compound?
A) Oxygen
B) Iron
C) Water
D) Nitrogen
Answer: C
10. Particles in gases are
A) Closely packed
B) Fixed
C) Far apart
D) Immovable
Answer: C
Part B: Very Short Answer Questions (1 Mark)
Q1. Define matter.
Answer:
Matter is anything that has mass and occupies space.
Q2. What is an atom?
Answer:
An atom is the smallest particle of an element.
Q3. Define molecule.
Answer:
A molecule is the smallest particle capable of independent existence.
Q4. What is a formula unit?
Answer:
It is the simplest whole-number ratio of ions in an ionic compound.
Q5. Give one example of a homogeneous mixture.
Answer:
Air.
Q6. Give one example of a heterogeneous mixture.
Answer:
Oil and water.
Q7. Name one covalent network solid.
Answer:
Diamond.
Q8. Which state of matter is most compressible?
Answer:
Gas.
Q9. Which particles have maximum kinetic energy?
Answer:
Gas particles.
Q10. Name one monoatomic gas.
Answer:
Helium.
Part C: Short Answer Questions (2–3 Marks)
Q1. State any three properties of matter.
Answer
Matter has mass.
Matter occupies space.
Matter is made up of tiny particles.
Q2. Write three differences between solids and liquids.
| Solid | Liquid |
|---|---|
| Fixed shape | No fixed shape |
| Strong force | Weak force |
| Least compressible | Slightly compressible |
Q3. Differentiate between homogeneous and heterogeneous mixtures.
Homogeneous Mixture
Uniform composition
Single phase
Components are not visible
Heterogeneous Mixture
Non-uniform composition
Two or more phases
Components are visible
Q4. Write any three properties of gases.
Answer
No definite shape
No definite volume
Highly compressible
Q5. Define element and compound with examples.
Element: Pure substance made of one kind of atom.
Example: Iron
Compound: Pure substance made of two or more elements chemically combined.
Example: Water
Part D: Long Answer Questions (5 Marks)
Q1. Explain the classification of matter.
Answer
Matter is classified into:
1. Pure Substance
Contains only one kind of particle.
Types
Elements
Compounds
2. Mixture
Contains two or more substances.
Types
Homogeneous mixture
Heterogeneous mixture
Draw a neat flow chart for better presentation.
Q2. Explain the properties of solids, liquids and gases.
| Property | Solid | Liquid | Gas |
|---|---|---|---|
| Shape | Fixed | Not fixed | Not fixed |
| Volume | Fixed | Fixed | Not fixed |
| Compressibility | Least | Low | High |
| Density | High | Medium | Low |
| Particle movement | Vibrate | Slide | Free movement |
Part E: Assertion and Reason
1.
Assertion (A):
Gas particles are highly compressible.
Reason (R):
There are large spaces between gas particles.
A. Both A and R are true and R explains A.
Answer: A
2.
Assertion:
Air is a homogeneous mixture.
Reason:
Its composition is uniform throughout.
Answer: A
3.
Assertion:
Water is an element.
Reason:
Water contains hydrogen and oxygen.
Answer:
Assertion is false, Reason is true.
4.
Assertion:
Formula unit is used for ionic compounds.
Reason:
Ionic compounds do not exist as separate molecules.
Answer: A
5.
Assertion:
Solids are highly compressible.
Reason:
Particles are closely packed.
Answer:
Assertion is false, Reason is true.
Part F: Fill in the Blanks
Matter has ______ and occupies ______.
Answer: mass, space
The smallest particle capable of independent existence is ______.
Answer: Molecule
Air is a ______ mixture.
Answer: Homogeneous
Soil is a ______ mixture.
Answer: Heterogeneous
NaCl is represented by a ______.
Answer: Formula unit
Particles are in continuous ______.
Answer: Motion
Diamond is a ______ network solid.
Answer: Covalent
Gas particles have maximum ______ energy.
Answer: Kinetic
Solids have definite ______ and ______.
Answer: Shape, Volume
Liquids have fixed ______ but not fixed ______.
Answer: Volume, Shape
Part G: Match the Following
| Column A | Column B |
|---|---|
| Atom | Element |
| Molecule | Water |
| Formula Unit | NaCl |
| Homogeneous Mixture | Air |
| Heterogeneous Mixture | Soil |
Answers
Atom → Element
Molecule → Water
Formula Unit → NaCl
Homogeneous Mixture → Air
Heterogeneous Mixture → Soil
Part H: Statement-Based Questions
Statement 1
Matter occupies space.
Statement 2
Matter has mass.
Choose the correct option.
A) Both are true.
B) Only Statement 1 is true.
C) Only Statement 2 is true.
D) Both are false.
Answer: A
Statement 2
Statement 1
Elements contain one type of atom.
Statement 2
Compounds contain two or more elements chemically combined.
Answer: Both statements are true.
Part I: Case Study Questions
Case Study
A student adds sugar into water. After stirring, the sugar disappears completely. The solution becomes clear and tastes sweet.
Questions
1. What type of mixture is formed?
Answer:
Homogeneous mixture.
2. Why does sugar disappear?
Answer:
Sugar particles occupy spaces between water particles.
3. Can sugar be separated from water?
Answer:
Yes, by evaporation.
4. Is the composition uniform?
Answer:
Yes.
5. Name another homogeneous mixture.
Answer:
Air.
Part J: Higher-Order Thinking Questions (HOTS)
Q1.
Why are gases highly compressible while solids are not?
Answer:
Gas particles have large intermolecular spaces, whereas solid particles are closely packed.
Q2.
Why does perfume spread throughout a room?
Answer:
Because gas particles move continuously and diffuse in all directions.
Q3.
Why is diamond very hard?
Answer:
Diamond has a giant covalent network with strong covalent bonds throughout the crystal.
Q4.
Why can't NaCl exist as molecules?
Answer:
NaCl is an ionic compound composed of ions arranged in a crystal lattice, so it is represented by a formula unit rather than molecules.
Important CBSE Viva Questions
What is matter?
Define an atom.
Define a molecule.
What is a formula unit?
What is an element?
What is a compound?
What is a mixture?
Differentiate homogeneous and heterogeneous mixtures.
Why are gases compressible?
Give one example each of an element, compound, and mixture.
These questions cover the major CBSE Class 11 exam patterns, including objective, subjective, competency-based, and case-study questions for effective revision.
Internal Links
- States of Matter – Complete Notes
- Kinetic Theory of Matter
- Physical and Chemical Properties of Matter
- Classification of Matter
- Atomic Structure Basics
- Dalton's Atomic Theory
- Mole Concept Explained
- Laws of Chemical Combination
- Chemical Bonding Basics
- Periodic Table Introduction
- Elements, Compounds, and Mixtures
- Solutions and Colloids
- NCERT Class 11 Chemistry Notes
- NEET Chemistry Formula Sheet
- NEET Chemistry Chapter-wise MCQs
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