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सी.आई.एस.सी.ई.आईसीएसई ICSE Class 7

What Does 2h2s Represent ?

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प्रश्न

What does 2H2S  represent ?

एक पंक्ति में उत्तर
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उत्तर

2H2S = 2 molecules of hydrogen sulphide.

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अध्याय 4: Atomic Structure - Exercise

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एस पी सिंग Concise Chemistry [English] Class 7 ICSE
अध्याय 4 Atomic Structure
Exercise | Q 3.2

संबंधित प्रश्न

Write the molecular formulae of Magenesium oxide :


Write the molecular formulae of Calcium hydroxide :


Write the molecular formulae of Hydrogen chloride :


Write the molecular formulae of Calcium phosphate :


The valency of sodium is one, write the molecular formula for sodium carbonate ?


State the term

A group of atoms that react as a single unit ______.


What is a molecule ? Explain with an example.


Write the cations and anions present, if any, in the following : 

  1. CH3COONa 
  2. NaCl
  3. H2
  4. NH4NO3

If one mole of nitrogen molecules weighs 28 g, calculate the mass of one molecule of nitrogen in grams.


‘Atoms of the same element or different from Dalton’s atomic theory by the Modern Atomic Theory.
Give two examples each of –

  • Atoms of the same element
  • Atoms of different elements combining to form a molecule.

Fill in the blank:

A molecule of an element is _________.


State the correct formula of the following from the option given:

Calcium hydroxide


State the correct formula of the following from the option given:

Copper [II] nitrate


Name the following:

The compound formed when iron [Fe2+] combines with oxygen [O2−].


Name the following:

A non-metal which forms a polyatomic molecule with more than three atoms.


Express each of the following in kilograms

5.84 × 10−3 mg


A group of atoms carrying a fixed charge on them is called ————.


______ can be formed by the same or different kinds of atoms.


______ of an element consist of a fixed number of different types of atom.


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