Chapter 3 of 12
Concept Maps
Atoms and Molecules — Concept Maps
Gujarat Board · Class 9 · Science
3 concept maps of Atoms and Molecules for Gujarat Board Class 9 Science, each also written out as a text outline.
59 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
- Conservation of Mass
- Mass of Reactants equals Mass of Products
- Established by Lavoisier
- Definite Proportions
- Fixed ratio by mass in compounds
- Stated by Proust
- Conservation of Mass
- Daltons Atomic Theory
- 6 Postulates
- Atoms are tiny particles
- Atoms indivisible and indestructible
- Same element same mass
- Different elements different mass
- Combine in whole number ratios
- Fixed ratio in compound
- Explains both laws
- Limitation: atoms are divisible
- 6 Postulates
- Atoms
- Extremely tiny - nanometre scale
- Symbols by IUPAC
- First letter capital
- Second letter small
- Some from Latin names
- Atomic Mass Unit
- 1 u = 1/12 of Carbon-12 atom
- Relative Atomic Mass
- Molecules
- Smallest independent particle
- Atomicity
- Monoatomic: He, Ar, Ne
- Diatomic: H2, O2, N2, Cl2
- Triatomic: O3
- Tetra-atomic: P4
- Poly-atomic: S8
- Molecules of compounds
- Different atoms combined
- Definite mass ratio
- Ions
- Cation - positive charge
- Anion - negative charge
- Polyatomic ions
- NH4+ Ammonium
- OH- Hydroxide
- SO42- Sulphate
- CO32- Carbonate
- NO3- Nitrate
- PO43- Phosphate
- Chemical Formulae
- Criss-cross method
- Valency must balance
- Metal written first
- Brackets for polyatomic ions
- Molecular Mass
- Sum of all atomic masses
- Formula Unit Mass for ionic compounds
- Expressed in u
- Laws of Chemical Combination
Atoms and Molecules - Complete Concept Map
The map in words
- Atoms and Molecules
- Laws of Chemical Combination
- Conservation of Mass
- Mass not created/destroyed
- Reactants = Products
- Constant Proportions
- Fixed element ratios
- Definite composition
- Conservation of Mass
- Atomic Theory
- Dalton's Postulates
- Atoms are indivisible
- Elements have identical atoms
- Different elements differ
- Combine in whole ratios
- Ancient Philosophy
- Maharishi Kanad
- Democritus
- Dalton's Postulates
- Atoms
- Structure and Size
- Extremely small
- Measured in nanometers
- Cannot see with eyes
- Symbols
- One or two letters
- First letter uppercase
- From element names
- Atomic Mass
- Relative to C-12
- Measured in u
- Used in calculations
- Structure and Size
- Molecules
- Element Molecules
- Monoatomic
- Diatomic
- Polyatomic
- Compound Molecules
- Different elements
- Fixed ratios
- Show properties
- Element Molecules
- Ions and Compounds
- Types of Ions
- Cations positive
- Anions negative
- Polyatomic groups
- Writing Formulas
- Using valency
- Crossing method
- Balancing charges
- Mass Calculations
- Molecular mass
- Formula unit mass
- Sum of atomic masses
- Types of Ions
- Laws of Chemical Combination
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
- Reactants mass = Products mass
- Given by Lavoisier
- Law of Constant Proportions
- Fixed ratio by mass in compounds
- Water H to O = 1 to 8
- Given by Proust
- Law of Conservation of Mass
- Daltons Atomic Theory
- All matter made of atoms
- Atoms are indivisible
- Same element = same atoms
- Compounds = fixed atom ratios
- Explains both laws
- Atoms
- Very tiny particles
- Radius in nanometres
- Chemical Symbols from IUPAC
- Atomic Mass in u
- Standard = Carbon 12
- Molecules
- Two or more bonded atoms
- Molecules of Elements
- Monoatomic He Ar Ne
- Diatomic H2 O2 N2 Cl2
- Polyatomic P4 S8
- Molecules of Compounds
- Water H2O
- Ammonia NH3
- CO2
- Ions
- Cation positive
- Na+ Ca2+ Al3+
- Anion negative
- Cl- O2- N3-
- Polyatomic Ions
- OH- Hydroxide
- SO4 2- Sulphate
- CO3 2- Carbonate
- NH4+ Ammonium
- Cation positive
- Chemical Formulae
- Valency = combining power
- Criss Cross Method
- Metal written first
- Brackets for polyatomic ions
- Molecular Mass
- Sum of atomic masses
- Expressed in u
- H2O = 18u CO2 = 44u
- Formula Unit Mass for ionic compounds
- Laws of Chemical Combination
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Explore DiagramsFrequently Asked Questions
What are the important topics in Atoms and Molecules for Gujarat Board Class 9 Science?
Key topics in Atoms and Molecules include Laws of Chemical Combination, Dalton's Atomic Theory, Atoms – Size, Symbols and Atomic Mass, Molecules – Types 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 - Complete 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 59 practice questions on Atoms and Molecules. Revise definitions regularly and use flashcards for quick recall before the exam.
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