Question

1 For the following questions consider a compound of calcium and chlorine.

a What type of bond do calcium and chlorine form?

b Describe how this bond forms.

c What is the chemical formula for the compound? Explain.

2 For the following questions consider a water molecule, H₂O.

a What type of bond is formed between the oxygen and the hydrogen atoms?

b Describe how these bonds form.

c Explain why there are two hydrogen atoms for each oxygen atom.

3 For the following questions consider a piece of copper wire.

a What type of bond is formed between the copper atoms?

b Describe how these bonds form.

c Explain why copper is a good electrical conductor.

Answer 1

1 .

a ) calcium is a metal and chlorine is non-metal

so ionic bond exists

b )

calcium atomic no : 20

chlorine atomic no : 17

with thi electronic configuration is

calcium = 20 = 1s²2s²2p⁶3s²3p⁶4s²

chlorine = 17 = 1s²2s²2p⁶3s²3p⁵

so with the above configuration calcium 4s electrons excites

then the compound will forms

c )

CaCl₂

called as calcium chloride

2.

a )

covalent bond exists between hydrogen and oxygen

b )

oxygen atomic no = 8

electronic configuration is = 1s²2s²2p⁴

hydrogen atomic no is = 1

electronic configuration is = 1s¹

two hydrogen and one oxygen will participate in the bond and

as whole as a product water molecule will form.

c )

beacause in two hydrogens are having only one electron but to form bond with oxygen

two electrons require.

this is the reason why two hydrogens are need for one oxygen

3.

a )

metallic bond is formed in copper wire

and it is also called as semicovalent bond

b )

in copper metal cores are acting like positive ions

and electrons are having negative charge

the bond is between positive metal ion cores to the electrons will form

c )

inside the copper as said above

the bond is semicovalent bond this is th reason the electrons are freely

move anywhere inside the metal

because of this reason copper is a good electrical conductor.