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Chemistry Class 7 ICSE CISCE Topics and Syllabus

Academic year:

Syllabus

1 Matter and Its Composition
  • Definition of matter.
  • The matter has mass and occupies space - Explanation.
  • The composition of matter – the brief introduction
2 Physical and Chemical Changes
  • Concept of Chemical Changes 
    • Meaning of Chemical Changes 
    • Characteristics of Chemical Changes 
    • Examples of Chemical Changes
    • Experiment: Burning of a magnesium ribbon in air and collection of magnesium oxide in a watch-glass
    • Experiment: Formation of hydrogen gas by the action of dilute sulphuric acid on zinc.
    • Experiment: When copper sulphate reacts with iron, two new substances, i.e., ferrous sulphate and copper are formed.
    • Experiment: When carbon dioxide is passed through lime water, calcium carbonate is formed, which makes lime water milky.
  • Concept of Physical Changes 
    • Meaning of Physical Changes
    • Characteristics of Physical Changes
    • Examples of Physical Changes
  • Change of State of Matter 
  • Types of Change Involved When There is a Change of Energy. 
  • Physical and chemical changes.
  • Chemical change - formation of a new product with new properties.
  • Differentiating between physical and chemical change.
  • Classification as physical & chemical change.
  • Types of change involved when there is a change of state of matter.
  • Types of change involved when there is a change of energy.
3 Elements, Compounds and Mixtures (Experimental Techniques)

Identification of elements, and compounds from the representation of their symbols and formulae.

Mixtures and compounds: difference between mixtures and compounds on the basis of the chemical composition of constituents.

Recall that a mixture is formed when two or more substances are mixed in any proportion such that
their particles are in intimate contact with one another without undergoing a chemical change.

Types of mixtures: -

  • Homogeneous & Heterogeneous mixtures
  • On the basis of State: Solid –solid;Solid-liquid;Liquid-liquid.

Separation techniques:

  • evaporation
  • distillation,
  • use of separating funnel,
  • sublimation,
  • fractional distillation.

Examine the principle behind each separation technique.

Chromatography as a separation technique; Paper chromatography.

4 Atomic Structure

Atoms, Molecules and Radicals

  • An atom is the smallest particle of an element.
  • It is not capable of independent existence.
  • The properties of an element depend upon the atoms constituting it.
  • A molecule is the smallest particle of an element or compound, capable of independent existence. It consists of one or more than one atom of the same or different elements.
  •  A radical is a single atom of an element or a group of atoms of different elements behaving as single unit and with a charge on group.
  • Atomicity (no. of atoms in an entity) of elements and compounds – mono atomic, diatomic, triatomic, polyatomic.
  • Associate the first 20 elements in the periodic table with their names and symbols
  • Valency is the combining capacity of an element or the number of hydrogen 0atoms with which it combines or replaces.
5 Language of Chemistry

Chemical reactions

A chemical reaction may take place when two or more reactants come in contact with one another and transfer of energy takes place.

Characteristics of occurrence of a chemical reaction:
Change of:
 Colour
 State
 Smell
 Evolution of gas
 Precipitate formed
 Heat evolved / released

  • Chemical Equations: Writing word equations for chemical reactions and emphasize on the observational skills and the names of products formed

Some examples of word equations for practice.

6 Metals and Non-metals
  • Metals, non-metals
  • Properties
  • Distinguish between metals and non-metals with the general properties (lustre,conduction of electricity, heat, malleability, ductility, sonority, melting point, boiling point, density, strength.)
  • Classification of elements as metals & non-metals.
  • Corrosion of iron (rusting); ways to prevent rusting (oiling, painting, chrome plating, galvanization, tinning) (avoiding contact with air and water vapour).
  • Uses of certain metals (iron, gold, copper, aluminium, zinc, lead, magnesium).
  • Metalloids: elements that show the properties of both metals and non-metals – e.g. silicon, germanium,tungsten, antimony); uses.
7 Air and Atmosphere
  • Air a mixture of gases.
  • Composition of air and uses of its components.
  • Oxygen is needed for combustion.
  • Mass change during burning (burning of magnesium and candle).
  • Word equations for reactions of metals and non-metals (S, C, P, Na, K, Ca, Mg) with O.
  • Products formed in acid rain; effects of acid rain.
  • Air quality.
  • Study the properties of oxygen: (physical properties to include colour, odour).

Distinguish between:

  • Respiration and combustion,
  • Combustion and rusting.
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