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When two atoms combine to form a molecul...

When two atoms combine to form a molecule .

A

Energy is released

B

Energy is absorbed

C

Energy is neither released nor absorbed

D

Energy may either released or absorbed

Text Solution

Verified by Experts

The correct Answer is:
A
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Why do atoms combine to form a molecule ?

Fill in the blanks in the following sentances: (i). Two atoms of the same element combine to form a molecule. The bond between them is known as____ bond (ii). Two chlorine atoms combine to form a molecule. The bond between them is known as_____ (iii). In forming oxygen molecule_____electrons are shared by each atom of oxygen. (iv). In forming N_(2) molecule,_____electrons are shared by each atom of nitrogen. (v). The number of siingle covalent bonds in C_(2)H_(2) molecule are______ (vi). Melting points and boiling points of ionic compounds are generally______than those of covalent compounds.

Knowledge Check

  • When two atoms of a diatomic gas combine to form a molecule of the gas, the energy of molecule is

    A
    equal to that of two separate atoms
    B
    greater than that of two separate atoms
    C
    lower than that of two separate atoms
    D
    double the energy of the atom

  • Teo atoms of hydrogen combine to form a molecule of hydrogen gas, the energy of the H_(2) molecule is :

    A
    Greater than that of separate atoms
    B
    Equal to that of separate atoms
    C
    Lower than that of separate atoms
    D
    Some times lower and some times higher

  • When two atoms of chlorine combine to form one molecule of chlorine gas, the energy of the molecule is

    A
    equal to that of separate atoms
    B
    lower than that of separate atom
    C
    greater than that of the separate atoms
    D
    None of the above.

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    In a combination reaction two elements combine to form a compound .

    What is the charge in mass when 2 mole of hydroghen atoms combine to form 1 mole fo H_(2) molecule if: 2H rarr H_(2), Delta E = -436 kJ ? Comment on the result.

    What is the necessary condition for the formation of covalent bond between two atoms of an element to form a molecule?

    Two or more atoms of the same or different elements chemically combine to form a (i) molecule of an element (ii) molecule of a covalent compound (iii) polyatomic ion (iv) network solid

    Atomic orbitals of bonded atoms combine to form molecular orbitals. The number of molecular orbitals formed is equal to the number of atomic orbitals taking part in the bond formation. When two atomic orbitals combine, two molecular orbitals are formed one of which has lower energy than the combining orbitals and is called bonding Molecular Orbital (MO). Whereas the other having higher energy than the two combining atomic orbitals is called Anti Bonding Molecular orbitals (ABMO) The two combining atomic orbitals must have comparable energies and should be properly oriented to allow considerable overlapping. If the overlapping is end to end along internuclear axis, the molecular orbital is called sigma and if the overlapping is lateral 1.e., sidewise the molecular orbital is called pie. Just like atomic orbitals, the molecular orbitals also have varying energy levels. Filling of electrons in molecular orbitals takes place following the same rules as followed for filing of atomic orbitals. The order of filling may not be same for all the molecules or their ions. Bond order is a useful parameter for comparing the various characteristics of molecules. In the homonuclear diatomic molecule which of the following sets of M.O. orbitals are grade or un-grade

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