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Concept Maps
Atoms and Molecules — Concept Maps
Punjab Board · Class 9 · Science
3 concept maps of Atoms and Molecules for Punjab Board Class 9 Science, each also written out as a text outline.
44 questions30 flashcards5 concepts
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3 Concept Maps
Atoms and Molecules – Complete Chapter Overview
The map in words
- Atoms and Molecules
- Laws of Chemical Combination
- Law of Conservation of Mass
- Mass cannot be created or destroyed
- Reactant mass = Product mass
- Law of Constant Proportions
- Fixed ratio by mass
- Same in all samples
- Law of Conservation of Mass
- Dalton's Atomic Theory
- All matter has atoms
- Atoms are indivisible
- Same element same mass
- Different elements different mass
- Combine in whole number ratios
- Atoms
- Smallest particle of element
- Measured in nanometres
- Symbols from IUPAC
- Atomic Mass in u
- Standard is Carbon-12
- Molecules
- Elements same atoms
- Monoatomic He Ar
- Diatomic H2 O2 N2
- Polyatomic P4 S8
- Compounds different atoms
- Water H2O
- Ammonia NH3
- Carbon dioxide CO2
- Elements same atoms
- Ions
- Cation positive charge
- Anion negative charge
- Polyatomic ions groups
- Ammonium NH4 plus
- Sulphate SO4 2minus
- Carbonate CO3 2minus
- Chemical Formulae
- Valency combining capacity
- Criss-cross method
- Metal written first
- Brackets for polyatomic ions
- Molecular Mass
- Sum of atomic masses
- Molecular compounds
- Formula Unit Mass
- Ionic compounds
- Same calculation method
- Laws of Chemical Combination
Atoms and Molecules - Comprehensive Concept Map
The map in words
- Atoms and Molecules
- Laws of Chemical Combination
- Law of Conservation of Mass
- Mass cannot be created
- Mass cannot be destroyed
- Total mass is conserved
- Law of Constant Proportions
- Fixed element ratios
- Same composition always
- Independent of source
- Law of Conservation of Mass
- Structure of Matter
- Atoms
- Indivisible particles
- Building blocks
- Very small size
- Symbols and notation
- Molecules
- Groups of atoms
- Chemically bonded
- Independent existence
- Two or more atoms
- Ions
- Charged particles
- Cations positive
- Anions negative
- Polyatomic groups
- Atoms
- Atomic Properties
- Atomic Mass
- Relative mass
- Carbon-12 standard
- Measured in u
- Valency
- Combining capacity
- Determines bonding
- Helps write formulas
- Atomic Mass
- Molecular Properties
- Molecular Mass
- Sum of atomic masses
- Calculated from formula
- Used in stoichiometry
- Formula Unit Mass
- For ionic compounds
- Same calculation method
- Different terminology
- Molecular Mass
- Chemical Formulae
- Writing Rules
- Balance charges
- Metal first
- Brackets for polyatomic
- Elements of Compounds
- Binary compounds
- Polyatomic ions
- Ionic compounds
- Writing Rules
- Laws of Chemical Combination
Atoms and Molecules: Complete Concept Overview
The map in words
- Atoms and Molecules
- Laws of Combination
- Conservation of Mass
- Mass unchanged in reactions
- Atoms rearranged
- Definite Proportions
- Fixed element ratios
- Same compound always
- Conservation of Mass
- Atomic Theory
- Dalton's Postulates
- Indivisible atoms
- Identical elements
- Simple combinations
- Explains Laws
- Why mass conserved
- Why proportions fixed
- Dalton's Postulates
- Atoms
- Structure
- Subatomic particles
- Nucleus and electrons
- Size
- Measured in nanometres
- Incredibly tiny
- Atomic Mass
- Relative to C-12
- Measured in u units
- Structure
- Molecules
- Elemental Molecules
- Monoatomic
- Diatomic
- Polyatomic
- Compound Molecules
- Fixed composition
- Specific ratios
- Atomicity
- Number of atoms
- Determines properties
- Elemental Molecules
- Chemical Formulae
- Valency
- Combining capacity
- Electron transfer
- Binary Compounds
- Two elements
- Charge balance
- Polyatomic Ions
- Charged groups
- Brackets in formula
- Valency
- Calculations
- Atomic Mass
- Standard reference
- C-12 = 12u
- Molecular Mass
- Sum of atoms
- Molecules
- Formula Unit Mass
- Ionic compounds
- Same calculation
- Atomic Mass
- Laws of Combination
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Explore DiagramsFrequently Asked Questions
What are the important topics in Atoms and Molecules for Punjab Board Class 9 Science?
Key topics in Atoms and Molecules include Historical Background and Laws of Chemical Combination, Dalton's Atomic Theory, Atoms – Size, Symbols, and Atomic Mass, Molecules – Elements, Compounds, and Atomicity. Study these first, then practise questions on each for Class 9 exams.
What do the concept maps for Atoms and Molecules show?
The 3 maps show how the ideas in Atoms and Molecules connect: Atoms and Molecules – Complete Chapter Overview; Atoms and Molecules - Comprehensive Concept Map. Each map is also written out as an outline on this page.
How should I revise Atoms and Molecules for Class 9 exams?
Learn the core ideas first, then work through the 44 practice questions on Atoms and Molecules. Revise definitions regularly and use flashcards for quick recall before the exam.
Sources & Official References
Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.
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